diff --git a/.gitignore b/.gitignore
index 87d02563ed048..f1ca6a79b5c5c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,6 +50,7 @@ build/
 /target
 /src/bootstrap/target
 /src/tools/x/target
+/inc-fat/
 # Created by default with `src/ci/docker/run.sh`
 /obj/
 /rustc-ice*
diff --git a/INSTALL.md b/INSTALL.md
index 9619ec2ce5cfa..1c2cecf8ef9b3 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -48,7 +48,7 @@ If building LLVM from source, you'll need additional tools:
   [LLVM's documentation](https://llvm.org/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library)
 * `ninja`, or GNU `make` 3.81 or later (Ninja is recommended, especially on
   Windows)
-* `cmake` 3.13.4 or later
+* `cmake` version listed on [LLVM's documentation](https://llvm.org/docs/GettingStarted.html#software)
 * `libstdc++-static` may be required on some Linux distributions such as Fedora
   and Ubuntu
 
diff --git a/compiler/rustc_ast/src/mut_visit.rs b/compiler/rustc_ast/src/mut_visit.rs
index cbf21317f1a77..1c1163551db5f 100644
--- a/compiler/rustc_ast/src/mut_visit.rs
+++ b/compiler/rustc_ast/src/mut_visit.rs
@@ -20,7 +20,7 @@ use rustc_span::symbol::Ident;
 use rustc_span::Span;
 use smallvec::{smallvec, Array, SmallVec};
 use std::ops::DerefMut;
-use std::{panic, ptr};
+use std::panic;
 use thin_vec::ThinVec;
 
 pub trait ExpectOne<A: Array> {
@@ -318,19 +318,8 @@ pub trait MutVisitor: Sized {
 //
 // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
 pub fn visit_clobber<T: DummyAstNode>(t: &mut T, f: impl FnOnce(T) -> T) {
-    unsafe {
-        // Safe because `t` is used in a read-only fashion by `read()` before
-        // being overwritten by `write()`.
-        let old_t = ptr::read(t);
-        let new_t =
-            panic::catch_unwind(panic::AssertUnwindSafe(|| f(old_t))).unwrap_or_else(|err| {
-                // Set `t` to some valid but possible meaningless value,
-                // and pass the fatal error further.
-                ptr::write(t, T::dummy());
-                panic::resume_unwind(err);
-            });
-        ptr::write(t, new_t);
-    }
+    let old_t = std::mem::replace(t, T::dummy());
+    *t = f(old_t);
 }
 
 // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
diff --git a/compiler/rustc_ast_lowering/src/item.rs b/compiler/rustc_ast_lowering/src/item.rs
index d59ac5766298d..0ad23b5356690 100644
--- a/compiler/rustc_ast_lowering/src/item.rs
+++ b/compiler/rustc_ast_lowering/src/item.rs
@@ -625,9 +625,12 @@ impl<'hir> LoweringContext<'_, 'hir> {
                             _ => Const::No,
                         }
                     } else {
-                        self.tcx
-                            .get_attr(def_id, sym::const_trait)
-                            .map_or(Const::No, |attr| Const::Yes(attr.span))
+                        if self.tcx.is_const_trait(def_id) {
+                            // FIXME(effects) span
+                            Const::Yes(self.tcx.def_ident_span(def_id).unwrap())
+                        } else {
+                            Const::No
+                        }
                     }
                 } else {
                     Const::No
diff --git a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
index c2c3f5bc79ed1..1cb74849017ab 100644
--- a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
@@ -34,9 +34,9 @@ use rustc_span::def_id::LocalDefId;
 use rustc_span::hygiene::DesugaringKind;
 use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::{BytePos, Span, Symbol};
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::FindExprBySpan;
 use rustc_trait_selection::infer::InferCtxtExt;
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt;
-use rustc_trait_selection::traits::error_reporting::FindExprBySpan;
 use rustc_trait_selection::traits::{Obligation, ObligationCause, ObligationCtxt};
 use std::iter;
 use std::ops::ControlFlow;
@@ -445,6 +445,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, '_, 'infcx, 'tcx> {
                 } else {
                     (None, &[][..], 0)
                 };
+                let mut can_suggest_clone = true;
                 if let Some(def_id) = def_id
                     && let node = self.infcx.tcx.hir_node_by_def_id(def_id)
                     && let Some(fn_sig) = node.fn_sig()
@@ -452,24 +453,73 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, '_, 'infcx, 'tcx> {
                     && let Some(pos) = args.iter().position(|arg| arg.hir_id == expr.hir_id)
                     && let Some(arg) = fn_sig.decl.inputs.get(pos + offset)
                 {
-                    let mut span: MultiSpan = arg.span.into();
-                    span.push_span_label(
-                        arg.span,
-                        "this parameter takes ownership of the value".to_string(),
-                    );
-                    let descr = match node.fn_kind() {
-                        Some(hir::intravisit::FnKind::ItemFn(..)) | None => "function",
-                        Some(hir::intravisit::FnKind::Method(..)) => "method",
-                        Some(hir::intravisit::FnKind::Closure) => "closure",
-                    };
-                    span.push_span_label(ident.span, format!("in this {descr}"));
-                    err.span_note(
-                        span,
-                        format!(
-                            "consider changing this parameter type in {descr} `{ident}` to borrow \
-                             instead if owning the value isn't necessary",
-                        ),
-                    );
+                    let mut is_mut = false;
+                    if let hir::TyKind::Path(hir::QPath::Resolved(None, path)) = arg.kind
+                        && let Res::Def(DefKind::TyParam, param_def_id) = path.res
+                        && self
+                            .infcx
+                            .tcx
+                            .predicates_of(def_id)
+                            .instantiate_identity(self.infcx.tcx)
+                            .predicates
+                            .into_iter()
+                            .any(|pred| {
+                                if let ty::ClauseKind::Trait(predicate) = pred.kind().skip_binder()
+                                    && [
+                                        self.infcx.tcx.get_diagnostic_item(sym::AsRef),
+                                        self.infcx.tcx.get_diagnostic_item(sym::AsMut),
+                                        self.infcx.tcx.get_diagnostic_item(sym::Borrow),
+                                        self.infcx.tcx.get_diagnostic_item(sym::BorrowMut),
+                                    ]
+                                    .contains(&Some(predicate.def_id()))
+                                    && let ty::Param(param) = predicate.self_ty().kind()
+                                    && let generics = self.infcx.tcx.generics_of(def_id)
+                                    && let param = generics.type_param(*param, self.infcx.tcx)
+                                    && param.def_id == param_def_id
+                                {
+                                    if [
+                                        self.infcx.tcx.get_diagnostic_item(sym::AsMut),
+                                        self.infcx.tcx.get_diagnostic_item(sym::BorrowMut),
+                                    ]
+                                    .contains(&Some(predicate.def_id()))
+                                    {
+                                        is_mut = true;
+                                    }
+                                    true
+                                } else {
+                                    false
+                                }
+                            })
+                    {
+                        // The type of the argument corresponding to the expression that got moved
+                        // is a type parameter `T`, which is has a `T: AsRef` obligation.
+                        err.span_suggestion_verbose(
+                            expr.span.shrink_to_lo(),
+                            "borrow the value to avoid moving it",
+                            format!("&{}", if is_mut { "mut " } else { "" }),
+                            Applicability::MachineApplicable,
+                        );
+                        can_suggest_clone = is_mut;
+                    } else {
+                        let mut span: MultiSpan = arg.span.into();
+                        span.push_span_label(
+                            arg.span,
+                            "this parameter takes ownership of the value".to_string(),
+                        );
+                        let descr = match node.fn_kind() {
+                            Some(hir::intravisit::FnKind::ItemFn(..)) | None => "function",
+                            Some(hir::intravisit::FnKind::Method(..)) => "method",
+                            Some(hir::intravisit::FnKind::Closure) => "closure",
+                        };
+                        span.push_span_label(ident.span, format!("in this {descr}"));
+                        err.span_note(
+                            span,
+                            format!(
+                                "consider changing this parameter type in {descr} `{ident}` to \
+                                 borrow instead if owning the value isn't necessary",
+                            ),
+                        );
+                    }
                 }
                 let place = &self.move_data.move_paths[mpi].place;
                 let ty = place.ty(self.body, self.infcx.tcx).ty;
@@ -487,9 +537,10 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, '_, 'infcx, 'tcx> {
                         ClosureKind::Coroutine(CoroutineKind::Desugared(_, CoroutineSource::Block)),
                     ..
                 } = move_spans
+                    && can_suggest_clone
                 {
                     self.suggest_cloning(err, ty, expr, None, Some(move_spans));
-                } else if self.suggest_hoisting_call_outside_loop(err, expr) {
+                } else if self.suggest_hoisting_call_outside_loop(err, expr) && can_suggest_clone {
                     // The place where the type moves would be misleading to suggest clone.
                     // #121466
                     self.suggest_cloning(err, ty, expr, None, Some(move_spans));
diff --git a/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs b/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs
index 6165a718a3030..ffe52f939dd3b 100644
--- a/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs
@@ -17,7 +17,7 @@ use rustc_middle::ty::adjustment::PointerCoercion;
 use rustc_middle::ty::{self, RegionVid, Ty, TyCtxt};
 use rustc_span::symbol::{kw, Symbol};
 use rustc_span::{sym, DesugaringKind, Span};
-use rustc_trait_selection::traits::error_reporting::FindExprBySpan;
+use rustc_trait_selection::error_reporting::traits::FindExprBySpan;
 
 use crate::region_infer::{BlameConstraint, ExtraConstraintInfo};
 use crate::{
diff --git a/compiler/rustc_borrowck/src/diagnostics/mod.rs b/compiler/rustc_borrowck/src/diagnostics/mod.rs
index 4567a014fe83d..b7fbb71a0cfa5 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mod.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mod.rs
@@ -27,8 +27,8 @@ use rustc_span::def_id::LocalDefId;
 use rustc_span::source_map::Spanned;
 use rustc_span::{symbol::sym, Span, Symbol, DUMMY_SP};
 use rustc_target::abi::{FieldIdx, VariantIdx};
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt as _;
 use rustc_trait_selection::infer::InferCtxtExt;
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::{
     type_known_to_meet_bound_modulo_regions, FulfillmentErrorCode,
 };
diff --git a/compiler/rustc_borrowck/src/diagnostics/move_errors.rs b/compiler/rustc_borrowck/src/diagnostics/move_errors.rs
index c817a80a541f7..4b6c1b29f285d 100644
--- a/compiler/rustc_borrowck/src/diagnostics/move_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/move_errors.rs
@@ -9,7 +9,7 @@ use rustc_middle::mir::*;
 use rustc_middle::ty::{self, Ty};
 use rustc_mir_dataflow::move_paths::{LookupResult, MovePathIndex};
 use rustc_span::{BytePos, ExpnKind, MacroKind, Span};
-use rustc_trait_selection::traits::error_reporting::FindExprBySpan;
+use rustc_trait_selection::error_reporting::traits::FindExprBySpan;
 
 use crate::diagnostics::CapturedMessageOpt;
 use crate::diagnostics::{DescribePlaceOpt, UseSpans};
diff --git a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
index 677029f9d3f95..26b0d23b16642 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
@@ -16,9 +16,9 @@ use rustc_middle::{
 use rustc_span::symbol::{kw, Symbol};
 use rustc_span::{sym, BytePos, DesugaringKind, Span};
 use rustc_target::abi::FieldIdx;
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt;
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits;
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt;
 
 use crate::diagnostics::BorrowedContentSource;
 use crate::util::FindAssignments;
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
index 13839214adc05..55147ee337fde 100644
--- a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs
@@ -10,14 +10,12 @@ use rustc_hir::GenericBound::Trait;
 use rustc_hir::QPath::Resolved;
 use rustc_hir::WherePredicate::BoundPredicate;
 use rustc_hir::{PolyTraitRef, TyKind, WhereBoundPredicate};
-use rustc_infer::infer::{
-    error_reporting::nice_region_error::{
-        self, find_anon_type, find_param_with_region, suggest_adding_lifetime_params,
-        HirTraitObjectVisitor, NiceRegionError, TraitObjectVisitor,
-    },
-    error_reporting::unexpected_hidden_region_diagnostic,
-    NllRegionVariableOrigin, RelateParamBound,
+use rustc_infer::infer::error_reporting::nice_region_error::{
+    self, find_anon_type, find_param_with_region, suggest_adding_lifetime_params,
+    HirTraitObjectVisitor, NiceRegionError, TraitObjectVisitor,
 };
+use rustc_infer::infer::error_reporting::region::unexpected_hidden_region_diagnostic;
+use rustc_infer::infer::{NllRegionVariableOrigin, RelateParamBound};
 use rustc_middle::bug;
 use rustc_middle::hir::place::PlaceBase;
 use rustc_middle::mir::{ConstraintCategory, ReturnConstraint};
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index d258c68b9598b..9ad941dabbe65 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -821,6 +821,8 @@ impl<'a, 'mir, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'mir, 'tcx, R>
             | TerminatorKind::Return
             | TerminatorKind::TailCall { .. }
             | TerminatorKind::CoroutineDrop => {
+                // Returning from the function implicitly kills storage for all locals and statics.
+                // Often, the storage will already have been killed by an explicit
                 // StorageDead, but we don't always emit those (notably on unwind paths),
                 // so this "extra check" serves as a kind of backup.
                 let borrow_set = self.borrow_set.clone();
diff --git a/compiler/rustc_borrowck/src/region_infer/opaque_types.rs b/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
index e195ceded1bf3..c0e91ce32e37b 100644
--- a/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
+++ b/compiler/rustc_borrowck/src/region_infer/opaque_types.rs
@@ -11,7 +11,7 @@ use rustc_middle::ty::visit::TypeVisitableExt;
 use rustc_middle::ty::{self, OpaqueHiddenType, OpaqueTypeKey, Ty, TyCtxt, TypeFoldable};
 use rustc_middle::ty::{GenericArgKind, GenericArgs};
 use rustc_span::Span;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::ObligationCtxt;
 
 use crate::session_diagnostics::LifetimeMismatchOpaqueParam;
diff --git a/compiler/rustc_borrowck/src/type_check/free_region_relations.rs b/compiler/rustc_borrowck/src/type_check/free_region_relations.rs
index 7553e3ee04fb4..431a704687d81 100644
--- a/compiler/rustc_borrowck/src/type_check/free_region_relations.rs
+++ b/compiler/rustc_borrowck/src/type_check/free_region_relations.rs
@@ -11,8 +11,8 @@ use rustc_middle::traits::query::OutlivesBound;
 use rustc_middle::traits::ObligationCause;
 use rustc_middle::ty::{self, RegionVid, Ty, TypeVisitableExt};
 use rustc_span::{ErrorGuaranteed, Span};
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::solve::deeply_normalize;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 use rustc_trait_selection::traits::query::type_op::{self, TypeOp};
 use std::rc::Rc;
 use type_op::TypeOpOutput;
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index 8bba7ef425520..db4b5209145f0 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -38,6 +38,7 @@ use rustc_span::def_id::CRATE_DEF_ID;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::sym;
 use rustc_span::Span;
+use rustc_span::DUMMY_SP;
 use rustc_target::abi::{FieldIdx, FIRST_VARIANT};
 use rustc_trait_selection::traits::query::type_op::custom::scrape_region_constraints;
 use rustc_trait_selection::traits::query::type_op::custom::CustomTypeOp;
@@ -49,6 +50,7 @@ use rustc_mir_dataflow::impls::MaybeInitializedPlaces;
 use rustc_mir_dataflow::move_paths::MoveData;
 use rustc_mir_dataflow::ResultsCursor;
 
+use crate::renumber::RegionCtxt;
 use crate::session_diagnostics::{MoveUnsized, SimdIntrinsicArgConst};
 use crate::{
     borrow_set::BorrowSet,
@@ -2333,7 +2335,57 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                         let cast_ty_from = CastTy::from_ty(ty_from);
                         let cast_ty_to = CastTy::from_ty(*ty);
                         match (cast_ty_from, cast_ty_to) {
-                            (Some(CastTy::Ptr(_)), Some(CastTy::Ptr(_))) => (),
+                            (Some(CastTy::Ptr(src)), Some(CastTy::Ptr(dst))) => {
+                                let mut normalize = |t| self.normalize(t, location);
+                                let src_tail =
+                                    tcx.struct_tail_with_normalize(src.ty, &mut normalize, || ());
+                                let dst_tail =
+                                    tcx.struct_tail_with_normalize(dst.ty, &mut normalize, || ());
+
+                                // This checks (lifetime part of) vtable validity for pointer casts,
+                                // which is irrelevant when there are aren't principal traits on both sides (aka only auto traits).
+                                //
+                                // Note that other checks (such as denying `dyn Send` -> `dyn Debug`) are in `rustc_hir_typeck`.
+                                if let ty::Dynamic(src_tty, ..) = src_tail.kind()
+                                    && let ty::Dynamic(dst_tty, ..) = dst_tail.kind()
+                                    && src_tty.principal().is_some()
+                                    && dst_tty.principal().is_some()
+                                {
+                                    // Remove auto traits.
+                                    // Auto trait checks are handled in `rustc_hir_typeck` as FCW.
+                                    let src_obj = tcx.mk_ty_from_kind(ty::Dynamic(
+                                        tcx.mk_poly_existential_predicates(
+                                            &src_tty.without_auto_traits().collect::<Vec<_>>(),
+                                        ),
+                                        tcx.lifetimes.re_static,
+                                        ty::Dyn,
+                                    ));
+                                    let dst_obj = tcx.mk_ty_from_kind(ty::Dynamic(
+                                        tcx.mk_poly_existential_predicates(
+                                            &dst_tty.without_auto_traits().collect::<Vec<_>>(),
+                                        ),
+                                        tcx.lifetimes.re_static,
+                                        ty::Dyn,
+                                    ));
+
+                                    // Replace trait object lifetimes with fresh vars, to allow casts like
+                                    // `*mut dyn FnOnce() + 'a` -> `*mut dyn FnOnce() + 'static`,
+                                    let src_obj =
+                                        freshen_single_trait_object_lifetime(self.infcx, src_obj);
+                                    let dst_obj =
+                                        freshen_single_trait_object_lifetime(self.infcx, dst_obj);
+
+                                    debug!(?src_tty, ?dst_tty, ?src_obj, ?dst_obj);
+
+                                    self.eq_types(
+                                        src_obj,
+                                        dst_obj,
+                                        location.to_locations(),
+                                        ConstraintCategory::Cast { unsize_to: None },
+                                    )
+                                    .unwrap();
+                                }
+                            }
                             _ => {
                                 span_mirbug!(
                                     self,
@@ -2856,3 +2908,16 @@ impl<'tcx> TypeOp<'tcx> for InstantiateOpaqueType<'tcx> {
         Ok(output)
     }
 }
+
+fn freshen_single_trait_object_lifetime<'tcx>(
+    infcx: &BorrowckInferCtxt<'tcx>,
+    ty: Ty<'tcx>,
+) -> Ty<'tcx> {
+    let &ty::Dynamic(tty, _, dyn_kind @ ty::Dyn) = ty.kind() else { bug!("expected trait object") };
+
+    let fresh = infcx
+        .next_region_var(rustc_infer::infer::RegionVariableOrigin::MiscVariable(DUMMY_SP), || {
+            RegionCtxt::Unknown
+        });
+    infcx.tcx.mk_ty_from_kind(ty::Dynamic(tty, fresh, dyn_kind))
+}
diff --git a/compiler/rustc_codegen_gcc/.github/workflows/ci.yml b/compiler/rustc_codegen_gcc/.github/workflows/ci.yml
index 839f3ba4de362..cd366dbae1609 100644
--- a/compiler/rustc_codegen_gcc/.github/workflows/ci.yml
+++ b/compiler/rustc_codegen_gcc/.github/workflows/ci.yml
@@ -49,11 +49,11 @@ jobs:
       # `llvm-14-tools` is needed to install the `FileCheck` binary which is used for asm tests.
       run: sudo apt-get install ninja-build ripgrep llvm-14-tools
 
-    - name: Install rustfmt
-      run: rustup component add rustfmt
+    - name: Install rustfmt & clippy
+      run: rustup component add rustfmt clippy
 
     - name: Download artifact
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}
 
     - name: Setup path to libgccjit
       run: |
@@ -78,9 +78,16 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        ./y.sh build
+        ./y.sh build --sysroot
         cargo test
-        ./y.sh clean all
+
+    - name: Run y.sh cargo build
+      run: |
+        ./y.sh cargo build --manifest-path tests/hello-world/Cargo.toml
+
+    - name: Clean
+      run: |
+        ./y.sh clean all      
 
     - name: Prepare dependencies
       run: |
@@ -96,7 +103,12 @@ jobs:
         ./y.sh test --release --clean --build-sysroot ${{ matrix.commands }}
 
     - name: Check formatting
-      run: cargo fmt -- --check
+      run: ./y.sh fmt --check
+
+    - name: clippy
+      run: |
+        cargo clippy --all-targets -- -D warnings
+        cargo clippy --all-targets --features master -- -D warnings
 
   duplicates:
     runs-on: ubuntu-latest
diff --git a/compiler/rustc_codegen_gcc/.github/workflows/failures.yml b/compiler/rustc_codegen_gcc/.github/workflows/failures.yml
index 2bca694e83284..e5d94767fe7d7 100644
--- a/compiler/rustc_codegen_gcc/.github/workflows/failures.yml
+++ b/compiler/rustc_codegen_gcc/.github/workflows/failures.yml
@@ -56,7 +56,7 @@ jobs:
 
     - name: Download artifact
       if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/gcc-13.deb
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/gcc-13.deb
 
     - name: Setup path to libgccjit
       if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
@@ -94,7 +94,20 @@ jobs:
       run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
 
     - name: Run tests
+      # TODO: re-enable those tests for libgccjit 12.
+      if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
       id: tests
       run: |
         ${{ matrix.libgccjit_version.env_extra }} ./y.sh test --release --clean --build-sysroot --test-failing-rustc ${{ matrix.libgccjit_version.extra }} | tee output_log
         rg --text "test result" output_log >> $GITHUB_STEP_SUMMARY
+
+    - name: Run failing ui pattern tests for ICE
+      # TODO: re-enable those tests for libgccjit 12.
+      if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
+      id: ui-tests
+      run: |
+        ${{ matrix.libgccjit_version.env_extra }} ./y.sh test --release --test-failing-ui-pattern-tests ${{ matrix.libgccjit_version.extra }} | tee output_log_ui
+        if grep -q "the compiler unexpectedly panicked" output_log_ui; then
+          echo "Error: 'the compiler unexpectedly panicked' found in output logs. CI Error!!"
+          exit 1
+        fi
diff --git a/compiler/rustc_codegen_gcc/.github/workflows/gcc12.yml b/compiler/rustc_codegen_gcc/.github/workflows/gcc12.yml
index f7bb156049233..5977ed33c56ec 100644
--- a/compiler/rustc_codegen_gcc/.github/workflows/gcc12.yml
+++ b/compiler/rustc_codegen_gcc/.github/workflows/gcc12.yml
@@ -68,21 +68,23 @@ jobs:
       run: |
         ./y.sh prepare --only-libcore --libgccjit12-patches
         ./y.sh build --no-default-features --sysroot-panic-abort
-        cargo test --no-default-features
-        ./y.sh clean all
-
-    - name: Prepare dependencies
-      run: |
-        git config --global user.email "user@example.com"
-        git config --global user.name "User"
-        ./y.sh prepare --libgccjit12-patches
-
-    - name: Add more failing tests for GCC 12
-      run: cat tests/failing-ui-tests12.txt >> tests/failing-ui-tests.txt
-
-    - name: Add more failing tests because the sysroot is not compiled with LTO
-      run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
-
-    - name: Run tests
-      run: |
-        ./y.sh test --release --clean --build-sysroot ${{ matrix.commands }} --no-default-features
+        # Uncomment when we no longer need to remove global variables.
+        #./y.sh build --sysroot --no-default-features --sysroot-panic-abort
+        #cargo test --no-default-features
+        #./y.sh clean all
+
+    #- name: Prepare dependencies
+      #run: |
+        #git config --global user.email "user@example.com"
+        #git config --global user.name "User"
+        #./y.sh prepare --libgccjit12-patches
+
+    #- name: Add more failing tests for GCC 12
+      #run: cat tests/failing-ui-tests12.txt >> tests/failing-ui-tests.txt
+
+    #- name: Add more failing tests because the sysroot is not compiled with LTO
+      #run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
+
+    #- name: Run tests
+      #run: |
+        #./y.sh test --release --clean --build-sysroot ${{ matrix.commands }} --no-default-features
diff --git a/compiler/rustc_codegen_gcc/.github/workflows/m68k.yml b/compiler/rustc_codegen_gcc/.github/workflows/m68k.yml
index a8c6b614ce815..34e4f2b0d4128 100644
--- a/compiler/rustc_codegen_gcc/.github/workflows/m68k.yml
+++ b/compiler/rustc_codegen_gcc/.github/workflows/m68k.yml
@@ -54,13 +54,7 @@ jobs:
       run: curl -LO https://github.com/cross-cg-gcc-tools/cross-gcc/releases/latest/download/gcc-m68k-13.deb
 
     - name: Download VM artifact
-      uses: dawidd6/action-download-artifact@v2
-      with:
-          workflow: m68k.yml
-          name: debian-m68k
-          repo: cross-cg-gcc-tools/vms
-          branch: master
-          event: push
+      run: curl -LO https://github.com/cross-cg-gcc-tools/vms/releases/latest/download/debian-m68k.img
 
     - name: Setup path to libgccjit
       run: |
@@ -88,10 +82,17 @@ jobs:
         sudo mount debian-m68k.img vm
         sudo cp $(which qemu-m68k-static) vm/usr/bin/
 
+    - name: Build sample project with target defined as JSON spec
+      run: |
+        ./y.sh prepare --only-libcore --cross
+        ./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu --target ${{ github.workspace }}/target_specs/m68k-unknown-linux-gnu.json
+        ./y.sh cargo build --manifest-path=./tests/hello-world/Cargo.toml --target ${{ github.workspace }}/target_specs/m68k-unknown-linux-gnu.json
+        ./y.sh clean all
+
     - name: Build
       run: |
         ./y.sh prepare --only-libcore --cross
-        ./y.sh build --target-triple m68k-unknown-linux-gnu
+        ./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu
         CG_GCC_TEST_TARGET=m68k-unknown-linux-gnu cargo test
         ./y.sh clean all
 
diff --git a/compiler/rustc_codegen_gcc/.github/workflows/release.yml b/compiler/rustc_codegen_gcc/.github/workflows/release.yml
index 28336998ffcd7..d5242926eb4db 100644
--- a/compiler/rustc_codegen_gcc/.github/workflows/release.yml
+++ b/compiler/rustc_codegen_gcc/.github/workflows/release.yml
@@ -37,7 +37,7 @@ jobs:
       run: sudo apt-get install ninja-build ripgrep
 
     - name: Download artifact
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/gcc-13.deb
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/gcc-13.deb
 
     - name: Setup path to libgccjit
       run: |
@@ -53,7 +53,7 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        EMBED_LTO_BITCODE=1 ./y.sh build --release --release-sysroot
+        EMBED_LTO_BITCODE=1 ./y.sh build --sysroot --release --release-sysroot
         cargo test
         ./y.sh clean all
 
@@ -62,12 +62,12 @@ jobs:
         git config --global user.email "user@example.com"
         git config --global user.name "User"
         ./y.sh prepare
-        # FIXME(antoyo): we cannot enable LTO for stdarch tests currently because of some failing LTO tests using proc-macros.
-        echo -n 'lto = "fat"' >> build_sysroot/Cargo.toml
 
     - name: Add more failing tests because of undefined symbol errors (FIXME)
       run: cat tests/failing-lto-tests.txt >> tests/failing-ui-tests.txt
 
     - name: Run tests
       run: |
+        # FIXME(antoyo): we cannot enable LTO for stdarch tests currently because of some failing LTO tests using proc-macros.
+        echo -n 'lto = "fat"' >> build_system/build_sysroot/Cargo.toml
         EMBED_LTO_BITCODE=1 ./y.sh test --release --clean --release-sysroot --build-sysroot ${{ matrix.commands }}
diff --git a/compiler/rustc_codegen_gcc/.github/workflows/stdarch.yml b/compiler/rustc_codegen_gcc/.github/workflows/stdarch.yml
index 41a9318007f15..e24b25b73690f 100644
--- a/compiler/rustc_codegen_gcc/.github/workflows/stdarch.yml
+++ b/compiler/rustc_codegen_gcc/.github/workflows/stdarch.yml
@@ -58,7 +58,7 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        ./y.sh build --release --release-sysroot
+        ./y.sh build --sysroot --release --release-sysroot
 
     - name: Set env (part 2)
       run: |
@@ -89,12 +89,11 @@ jobs:
     - name: Run stdarch tests
       if: ${{ !matrix.cargo_runner }}
       run: |
-        cd build_sysroot/sysroot_src/library/stdarch/
-        CHANNEL=release TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ../../../../y.sh cargo test
+        CHANNEL=release TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ./y.sh cargo test --manifest-path build/build_sysroot/sysroot_src/library/stdarch/Cargo.toml
 
     - name: Run stdarch tests
       if: ${{ matrix.cargo_runner }}
       run: |
-        cd build_sysroot/sysroot_src/library/stdarch/
         # FIXME: these tests fail when the sysroot is compiled with LTO because of a missing symbol in proc-macro.
-        STDARCH_TEST_EVERYTHING=1 CHANNEL=release CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="${{ matrix.cargo_runner }}" TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ../../../../y.sh cargo test -- --skip rtm --skip tbm --skip sse4a
+        # TODO: remove --skip test_mm512_stream_ps when stdarch is updated in rustc.
+        STDARCH_TEST_EVERYTHING=1 CHANNEL=release CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="${{ matrix.cargo_runner }}" TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ./y.sh cargo test --manifest-path build/build_sysroot/sysroot_src/library/stdarch/Cargo.toml -- --skip rtm --skip tbm --skip sse4a --skip test_mm512_stream_ps
diff --git a/compiler/rustc_codegen_gcc/.gitignore b/compiler/rustc_codegen_gcc/.gitignore
index bf975f92014da..c1e6631a281ba 100644
--- a/compiler/rustc_codegen_gcc/.gitignore
+++ b/compiler/rustc_codegen_gcc/.gitignore
@@ -6,10 +6,6 @@ perf.data
 perf.data.old
 *.events
 *.string*
-/build_sysroot/sysroot
-/build_sysroot/sysroot_src
-/build_sysroot/Cargo.lock
-/build_sysroot/test_target/Cargo.lock
 gimple*
 *asm
 res
diff --git a/compiler/rustc_codegen_gcc/Cargo.lock b/compiler/rustc_codegen_gcc/Cargo.lock
index 3ecb0ef6b4d29..915229f7e7eef 100644
--- a/compiler/rustc_codegen_gcc/Cargo.lock
+++ b/compiler/rustc_codegen_gcc/Cargo.lock
@@ -79,18 +79,18 @@ dependencies = [
 
 [[package]]
 name = "gccjit"
-version = "2.0.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecaa4c3da2d74c1a991b4faff75d49ab1d0522d9a99d8e2614b3b04d226417ce"
+checksum = "62e0ba949ebee07c5cc21f02cb48f28f2c8db7fcbc15fdc5120476a6c43b4636"
 dependencies = [
  "gccjit_sys",
 ]
 
 [[package]]
 name = "gccjit_sys"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "406a66fba005f1a02661f2f9443e5693dd3a667b7c58e70aa4ccc4c8b50b4758"
+checksum = "a5bbf85e12c2593772329a9d4e8310271f6706e6045ce4f41b041dd34fba6603"
 dependencies = [
  "libc",
 ]
diff --git a/compiler/rustc_codegen_gcc/Cargo.toml b/compiler/rustc_codegen_gcc/Cargo.toml
index c5aa2eed1e004..5caca63f63480 100644
--- a/compiler/rustc_codegen_gcc/Cargo.toml
+++ b/compiler/rustc_codegen_gcc/Cargo.toml
@@ -22,7 +22,7 @@ master = ["gccjit/master"]
 default = ["master"]
 
 [dependencies]
-gccjit = "2.0"
+gccjit = "2.1"
 
 # Local copy.
 #gccjit = { path = "../gccjit.rs" }
diff --git a/compiler/rustc_codegen_gcc/Readme.md b/compiler/rustc_codegen_gcc/Readme.md
index da6e91587fdaf..e92c16ece2f10 100644
--- a/compiler/rustc_codegen_gcc/Readme.md
+++ b/compiler/rustc_codegen_gcc/Readme.md
@@ -12,6 +12,14 @@ This is a GCC codegen for rustc, which means it can be loaded by the existing ru
 The primary goal of this project is to be able to compile Rust code on platforms unsupported by LLVM.
 A secondary goal is to check if using the gcc backend will provide any run-time speed improvement for the programs compiled using rustc.
 
+### Dependencies
+
+**rustup:** Follow the instructions on the official [website](https://www.rust-lang.org/tools/install)
+
+**DejaGnu:** Consider to install DejaGnu which is necessary for running the libgccjit test suite. [website](https://www.gnu.org/software/dejagnu/#downloading)
+
+
+
 ## Building
 
 **This requires a patched libgccjit in order to work.
@@ -80,7 +88,7 @@ Then you can run commands like this:
 
 ```bash
 $ ./y.sh prepare # download and patch sysroot src and install hyperfine for benchmarking
-$ ./y.sh build --release
+$ ./y.sh build --sysroot --release
 ```
 
 To run the tests:
@@ -91,10 +99,16 @@ $ ./y.sh test --release
 
 ## Usage
 
-`$CG_GCCJIT_DIR` is the directory you cloned this repo into in the following instructions:
+You have to run these commands, in the corresponding order:
 
 ```bash
-export CG_GCCJIT_DIR=[the full path to rustc_codegen_gcc]
+$ ./y.sh prepare
+$ ./y.sh build --sysroot
+```
+To check if all is  working correctly, run:
+
+ ```bash
+$ ./y.sh cargo build --manifest-path tests/hello-world/Cargo.toml
 ```
 
 ### Cargo
@@ -107,8 +121,7 @@ If you compiled cg_gccjit in debug mode (aka you didn't pass `--release` to `./y
 
 ### LTO
 
-To use LTO, you need to set the variable `FAT_LTO=1` and `EMBED_LTO_BITCODE=1` in addition to setting `lto = "fat"` in the `Cargo.toml`.
-Don't set `FAT_LTO` when compiling the sysroot, though: only set `EMBED_LTO_BITCODE=1`.
+To use LTO, you need to set the variable `EMBED_LTO_BITCODE=1` in addition to setting `lto = "fat"` in the `Cargo.toml`.
 
 Failing to set `EMBED_LTO_BITCODE` will give you the following error:
 
@@ -118,7 +131,13 @@ error: failed to copy bitcode to object file: No such file or directory (os erro
 
 ### Rustc
 
-> You should prefer using the Cargo method.
+If you want to run `rustc` directly, you can do so with:
+
+```bash
+$ ./y.sh rustc my_crate.rs
+```
+
+You can do the same manually (although we don't recommend it):
 
 ```bash
 $ LIBRARY_PATH="[gcc-path value]" LD_LIBRARY_PATH="[gcc-path value]" rustc +$(cat $CG_GCCJIT_DIR/rust-toolchain | grep 'channel' | cut -d '=' -f 2 | sed 's/"//g' | sed 's/ //g') -Cpanic=abort -Zcodegen-backend=$CG_GCCJIT_DIR/target/release/librustc_codegen_gcc.so --sysroot $CG_GCCJIT_DIR/build_sysroot/sysroot my_crate.rs
@@ -126,18 +145,19 @@ $ LIBRARY_PATH="[gcc-path value]" LD_LIBRARY_PATH="[gcc-path value]" rustc +$(ca
 
 ## Env vars
 
-<dl>
-    <dt>CG_GCCJIT_INCR_CACHE_DISABLED</dt>
-    <dd>Don't cache object files in the incremental cache. Useful during development of cg_gccjit
-    to make it possible to use incremental mode for all analyses performed by rustc without caching
-    object files when their content should have been changed by a change to cg_gccjit.</dd>
-    <dt>CG_GCCJIT_DISPLAY_CG_TIME</dt>
-    <dd>Display the time it took to perform codegen for a crate</dd>
-    <dt>CG_RUSTFLAGS</dt>
-    <dd>Send additional flags to rustc. Can be used to build the sysroot without unwinding by setting `CG_RUSTFLAGS=-Cpanic=abort`.</dd>
-    <dt>CG_GCCJIT_DUMP_TO_FILE</dt>
-    <dd>Dump a C-like representation to /tmp/gccjit_dumps and enable debug info in order to debug this C-like representation.</dd>
-</dl>
+ * _**CG_GCCJIT_DUMP_ALL_MODULES**_: Enables dumping of all compilation modules. When set to "1", a dump is created for each module during compilation and stored in `/tmp/reproducers/`.
+ * _**CG_GCCJIT_DUMP_MODULE**_: Enables dumping of a specific module. When set with the module name, e.g., `CG_GCCJIT_DUMP_MODULE=module_name`, a dump of that specific module is created in `/tmp/reproducers/`.
+ * _**CG_RUSTFLAGS**_: Send additional flags to rustc. Can be used to build the sysroot without unwinding by setting `CG_RUSTFLAGS=-Cpanic=abort`.
+ * _**CG_GCCJIT_DUMP_TO_FILE**_: Dump a C-like representation to /tmp/gccjit_dumps and enable debug info in order to debug this C-like representation.
+ * _**CG_GCCJIT_DUMP_RTL**_: Dumps RTL (Register Transfer Language) for virtual registers.
+ * _**CG_GCCJIT_DUMP_RTL_ALL**_: Dumps all RTL passes.
+ * _**CG_GCCJIT_DUMP_TREE_ALL**_: Dumps all tree (GIMPLE) passes.
+ * _**CG_GCCJIT_DUMP_IPA_ALL**_: Dumps all Interprocedural Analysis (IPA) passes.
+ * _**CG_GCCJIT_DUMP_CODE**_: Dumps the final generated code.
+ * _**CG_GCCJIT_DUMP_GIMPLE**_: Dumps the initial GIMPLE representation.
+ * _**CG_GCCJIT_DUMP_EVERYTHING**_: Enables dumping of all intermediate representations and passes.
+ * _**CG_GCCJIT_KEEP_INTERMEDIATES**_: Keeps intermediate files generated during the compilation process.
+ * _**CG_GCCJIT_VERBOSE**_: Enables verbose output from the GCC driver.
 
 ## Extra documentation
 
diff --git a/compiler/rustc_codegen_gcc/build.rs b/compiler/rustc_codegen_gcc/build.rs
deleted file mode 100644
index b93c17793bf37..0000000000000
--- a/compiler/rustc_codegen_gcc/build.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-// TODO: remove this file and deps/libLLVM-18-rust-1.78.0-nightly.so when
-// https://github.com/rust-lang/rust/pull/121967 is merged.
-fn main() {
-    println!("cargo:rerun-if-changed=deps/libLLVM-18-rust-1.78.0-nightly.so");
-    println!("cargo:rustc-link-search=deps");
-}
diff --git a/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock
new file mode 100644
index 0000000000000..d6ec1f87d0103
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock
@@ -0,0 +1,433 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "compiler_builtins",
+ "gimli",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "alloc"
+version = "0.0.0"
+dependencies = [
+ "compiler_builtins",
+ "core",
+]
+
+[[package]]
+name = "allocator-api2"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c6cb57a04249c6480766f7f7cef5467412af1490f8d1e243141daddada3264f"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "compiler_builtins"
+version = "0.1.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f11973008a8cf741fe6d22f339eba21fd0ca81e2760a769ba8243ed6c21edd7e"
+dependencies = [
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "core"
+version = "0.0.0"
+
+[[package]]
+name = "dlmalloc"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3264b043b8e977326c1ee9e723da2c1f8d09a99df52cacf00b4dbce5ac54414d"
+dependencies = [
+ "cfg-if",
+ "compiler_builtins",
+ "libc",
+ "rustc-std-workspace-core",
+ "windows-sys",
+]
+
+[[package]]
+name = "fortanix-sgx-abi"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57cafc2274c10fab234f176b25903ce17e690fca7597090d50880e047a0389c5"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "getopts"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14dbbfd5c71d70241ecf9e6f13737f7b5ce823821063188d7e46c41d371eebd5"
+dependencies = [
+ "rustc-std-workspace-core",
+ "rustc-std-workspace-std",
+ "unicode-width",
+]
+
+[[package]]
+name = "gimli"
+version = "0.28.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+dependencies = [
+ "allocator-api2",
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "hermit-abi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.153"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+dependencies = [
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "memchr"
+version = "2.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "miniz_oxide"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d811f3e15f28568be3407c8e7fdb6514c1cda3cb30683f15b6a1a1dc4ea14a7"
+dependencies = [
+ "adler",
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "object"
+version = "0.32.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6a622008b6e321afc04970976f62ee297fdbaa6f95318ca343e3eebb9648441"
+dependencies = [
+ "compiler_builtins",
+ "memchr",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "panic_abort"
+version = "0.0.0"
+dependencies = [
+ "alloc",
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "libc",
+]
+
+[[package]]
+name = "panic_unwind"
+version = "0.0.0"
+dependencies = [
+ "alloc",
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "libc",
+ "unwind",
+]
+
+[[package]]
+name = "proc_macro"
+version = "0.0.0"
+dependencies = [
+ "core",
+ "std",
+]
+
+[[package]]
+name = "r-efi"
+version = "4.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c47196f636c4cc0634b73b0405323d177753c2e15e866952c64ea22902567a34"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "r-efi-alloc"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31d6f09fe2b6ad044bc3d2c34ce4979796581afd2f1ebc185837e02421e02fd7"
+dependencies = [
+ "compiler_builtins",
+ "r-efi",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "rustc-std-workspace-alloc"
+version = "1.99.0"
+dependencies = [
+ "alloc",
+]
+
+[[package]]
+name = "rustc-std-workspace-core"
+version = "1.99.0"
+dependencies = [
+ "core",
+]
+
+[[package]]
+name = "rustc-std-workspace-std"
+version = "1.99.0"
+dependencies = [
+ "std",
+]
+
+[[package]]
+name = "std"
+version = "0.0.0"
+dependencies = [
+ "addr2line",
+ "alloc",
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "dlmalloc",
+ "fortanix-sgx-abi",
+ "hashbrown",
+ "hermit-abi",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "panic_abort",
+ "panic_unwind",
+ "r-efi",
+ "r-efi-alloc",
+ "rustc-demangle",
+ "std_detect",
+ "unwind",
+ "wasi",
+]
+
+[[package]]
+name = "std_detect"
+version = "0.1.5"
+dependencies = [
+ "cfg-if",
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "sysroot"
+version = "0.0.0"
+dependencies = [
+ "alloc",
+ "compiler_builtins",
+ "core",
+ "proc_macro",
+ "std",
+ "test",
+]
+
+[[package]]
+name = "test"
+version = "0.0.0"
+dependencies = [
+ "core",
+ "getopts",
+ "libc",
+ "panic_abort",
+ "panic_unwind",
+ "std",
+]
+
+[[package]]
+name = "unicode-width"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f5e5f3158ecfd4b8ff6fe086db7c8467a2dfdac97fe420f2b7c4aa97af66d6"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+ "rustc-std-workspace-std",
+]
+
+[[package]]
+name = "unwind"
+version = "0.0.0"
+dependencies = [
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "libc",
+ "unwinding",
+]
+
+[[package]]
+name = "unwinding"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37a19a21a537f635c16c7576f22d0f2f7d63353c1337ad4ce0d8001c7952a25b"
+dependencies = [
+ "compiler_builtins",
+ "gimli",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
diff --git a/compiler/rustc_codegen_gcc/build_sysroot/Cargo.toml b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml
similarity index 82%
rename from compiler/rustc_codegen_gcc/build_sysroot/Cargo.toml
rename to compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml
index e5658273c978a..e466992362386 100644
--- a/compiler/rustc_codegen_gcc/build_sysroot/Cargo.toml
+++ b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml
@@ -1,12 +1,14 @@
 [package]
-authors = ["bjorn3 <bjorn3@users.noreply.github.com>"]
+authors = ["rustc_codegen_gcc devs"]
 name = "sysroot"
 version = "0.0.0"
 resolver = "2"
 
 [dependencies]
 core = { path = "./sysroot_src/library/core" }
-compiler_builtins = "0.1"
+# TODO: after the sync, revert to using version 0.1.
+# compiler_builtins = "0.1"
+compiler_builtins = "=0.1.109"
 alloc = { path = "./sysroot_src/library/alloc" }
 std = { path = "./sysroot_src/library/std", features = ["panic_unwind", "backtrace"] }
 test = { path = "./sysroot_src/library/test" }
@@ -18,5 +20,5 @@ rustc-std-workspace-alloc = { path = "./sysroot_src/library/rustc-std-workspace-
 rustc-std-workspace-std = { path = "./sysroot_src/library/rustc-std-workspace-std" }
 
 [profile.release]
-debug = true
+debug = "limited"
 #lto = "fat" # TODO(antoyo): re-enable when the failing LTO tests regarding proc-macros are fixed.
diff --git a/compiler/rustc_codegen_gcc/build_sysroot/src/lib.rs b/compiler/rustc_codegen_gcc/build_system/build_sysroot/lib.rs
similarity index 100%
rename from compiler/rustc_codegen_gcc/build_sysroot/src/lib.rs
rename to compiler/rustc_codegen_gcc/build_system/build_sysroot/lib.rs
diff --git a/compiler/rustc_codegen_gcc/build_system/src/build.rs b/compiler/rustc_codegen_gcc/build_system/src/build.rs
index c81b02e2183d8..d465ab7e50662 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/build.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/build.rs
@@ -1,5 +1,7 @@
 use crate::config::{Channel, ConfigInfo};
-use crate::utils::{run_command, run_command_with_output_and_env, walk_dir};
+use crate::utils::{
+    copy_file, create_dir, get_sysroot_dir, run_command, run_command_with_output_and_env, walk_dir,
+};
 use std::collections::HashMap;
 use std::ffi::OsStr;
 use std::fs;
@@ -9,12 +11,14 @@ use std::path::Path;
 struct BuildArg {
     flags: Vec<String>,
     config_info: ConfigInfo,
+    build_sysroot: bool,
 }
 
 impl BuildArg {
+    /// Creates a new `BuildArg` instance by parsing command-line arguments.
     fn new() -> Result<Option<Self>, String> {
         let mut build_arg = Self::default();
-        // We skip binary name and the `build` command.
+        // Skip binary name and the `build` command.
         let mut args = std::env::args().skip(2);
 
         while let Some(arg) = args.next() {
@@ -29,6 +33,9 @@ impl BuildArg {
                         );
                     }
                 }
+                "--sysroot" => {
+                    build_arg.build_sysroot = true;
+                }
                 "--help" => {
                     Self::usage();
                     return Ok(None);
@@ -48,20 +55,20 @@ impl BuildArg {
             r#"
 `build` command help:
 
-    --features [arg]       : Add a new feature [arg]"#
+    --features [arg]       : Add a new feature [arg]
+    --sysroot              : Build with sysroot"#
         );
         ConfigInfo::show_usage();
         println!("    --help                 : Show this help");
     }
 }
 
-pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Result<(), String> {
-    let start_dir = Path::new("build_sysroot");
+fn cleanup_sysroot_previous_build(start_dir: &Path) {
     // Cleanup for previous run
     // Clean target dir except for build scripts and incremental cache
     let _ = walk_dir(
         start_dir.join("target"),
-        |dir: &Path| {
+        &mut |dir: &Path| {
             for top in &["debug", "release"] {
                 let _ = fs::remove_dir_all(dir.join(top).join("build"));
                 let _ = fs::remove_dir_all(dir.join(top).join("deps"));
@@ -70,7 +77,7 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
 
                 let _ = walk_dir(
                     dir.join(top),
-                    |sub_dir: &Path| {
+                    &mut |sub_dir: &Path| {
                         if sub_dir
                             .file_name()
                             .map(|filename| filename.to_str().unwrap().starts_with("libsysroot"))
@@ -80,7 +87,7 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
                         }
                         Ok(())
                     },
-                    |file: &Path| {
+                    &mut |file: &Path| {
                         if file
                             .file_name()
                             .map(|filename| filename.to_str().unwrap().starts_with("libsysroot"))
@@ -90,16 +97,39 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
                         }
                         Ok(())
                     },
+                    false,
                 );
             }
             Ok(())
         },
-        |_| Ok(()),
+        &mut |_| Ok(()),
+        false,
     );
 
     let _ = fs::remove_file(start_dir.join("Cargo.lock"));
     let _ = fs::remove_file(start_dir.join("test_target/Cargo.lock"));
     let _ = fs::remove_dir_all(start_dir.join("sysroot"));
+}
+
+pub fn create_build_sysroot_content(start_dir: &Path) -> Result<(), String> {
+    if !start_dir.is_dir() {
+        create_dir(start_dir)?;
+    }
+    copy_file("build_system/build_sysroot/Cargo.toml", &start_dir.join("Cargo.toml"))?;
+    copy_file("build_system/build_sysroot/Cargo.lock", &start_dir.join("Cargo.lock"))?;
+
+    let src_dir = start_dir.join("src");
+    if !src_dir.is_dir() {
+        create_dir(&src_dir)?;
+    }
+    copy_file("build_system/build_sysroot/lib.rs", &start_dir.join("src/lib.rs"))
+}
+
+pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Result<(), String> {
+    let start_dir = get_sysroot_dir();
+
+    cleanup_sysroot_previous_build(&start_dir);
+    create_build_sysroot_content(&start_dir)?;
 
     // Builds libs
     let mut rustflags = env.get("RUSTFLAGS").cloned().unwrap_or_default();
@@ -110,7 +140,6 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
     if config.no_default_features {
         rustflags.push_str(" -Csymbol-mangling-version=v0");
     }
-    let mut env = env.clone();
 
     let mut args: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &"build", &"--target", &config.target];
 
@@ -127,46 +156,33 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
         "debug"
     };
 
+    if let Ok(cg_rustflags) = std::env::var("CG_RUSTFLAGS") {
+        rustflags.push(' ');
+        rustflags.push_str(&cg_rustflags);
+    }
+
+    let mut env = env.clone();
     env.insert("RUSTFLAGS".to_string(), rustflags);
-    run_command_with_output_and_env(&args, Some(start_dir), Some(&env))?;
+    run_command_with_output_and_env(&args, Some(&start_dir), Some(&env))?;
 
     // Copy files to sysroot
     let sysroot_path = start_dir.join(format!("sysroot/lib/rustlib/{}/lib/", config.target_triple));
-    fs::create_dir_all(&sysroot_path).map_err(|error| {
-        format!(
-            "Failed to create directory `{}`: {:?}",
-            sysroot_path.display(),
-            error
-        )
-    })?;
-    let copier = |dir_to_copy: &Path| {
+    create_dir(&sysroot_path)?;
+    let mut copier = |dir_to_copy: &Path| {
         // FIXME: should not use shell command!
         run_command(&[&"cp", &"-r", &dir_to_copy, &sysroot_path], None).map(|_| ())
     };
     walk_dir(
         start_dir.join(&format!("target/{}/{}/deps", config.target_triple, channel)),
-        copier,
-        copier,
+        &mut copier.clone(),
+        &mut copier,
+        false,
     )?;
 
     // Copy the source files to the sysroot (Rust for Linux needs this).
     let sysroot_src_path = start_dir.join("sysroot/lib/rustlib/src/rust");
-    fs::create_dir_all(&sysroot_src_path).map_err(|error| {
-        format!(
-            "Failed to create directory `{}`: {:?}",
-            sysroot_src_path.display(),
-            error
-        )
-    })?;
-    run_command(
-        &[
-            &"cp",
-            &"-r",
-            &start_dir.join("sysroot_src/library/"),
-            &sysroot_src_path,
-        ],
-        None,
-    )?;
+    create_dir(&sysroot_src_path)?;
+    run_command(&[&"cp", &"-r", &start_dir.join("sysroot_src/library/"), &sysroot_src_path], None)?;
 
     Ok(())
 }
@@ -174,20 +190,11 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
 fn build_codegen(args: &mut BuildArg) -> Result<(), String> {
     let mut env = HashMap::new();
 
-    env.insert(
-        "LD_LIBRARY_PATH".to_string(),
-        args.config_info.gcc_path.clone(),
-    );
-    env.insert(
-        "LIBRARY_PATH".to_string(),
-        args.config_info.gcc_path.clone(),
-    );
+    env.insert("LD_LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
+    env.insert("LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
 
     if args.config_info.no_default_features {
-        env.insert(
-            "RUSTFLAGS".to_string(),
-            "-Csymbol-mangling-version=v0".to_string(),
-        );
+        env.insert("RUSTFLAGS".to_string(), "-Csymbol-mangling-version=v0".to_string());
     }
 
     let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &"rustc"];
@@ -212,18 +219,15 @@ fn build_codegen(args: &mut BuildArg) -> Result<(), String> {
     // We voluntarily ignore the error.
     let _ = fs::remove_dir_all("target/out");
     let gccjit_target = "target/out/gccjit";
-    fs::create_dir_all(gccjit_target).map_err(|error| {
-        format!(
-            "Failed to create directory `{}`: {:?}",
-            gccjit_target, error
-        )
-    })?;
-
-    println!("[BUILD] sysroot");
-    build_sysroot(&env, &args.config_info)?;
+    create_dir(gccjit_target)?;
+    if args.build_sysroot {
+        println!("[BUILD] sysroot");
+        build_sysroot(&env, &args.config_info)?;
+    }
     Ok(())
 }
 
+/// Executes the build process.
 pub fn run() -> Result<(), String> {
     let mut args = match BuildArg::new()? {
         Some(args) => args,
diff --git a/compiler/rustc_codegen_gcc/build_system/src/cargo.rs b/compiler/rustc_codegen_gcc/build_system/src/cargo.rs
deleted file mode 100644
index 1cfcdba6b1cd1..0000000000000
--- a/compiler/rustc_codegen_gcc/build_system/src/cargo.rs
+++ /dev/null
@@ -1,114 +0,0 @@
-use crate::config::ConfigInfo;
-use crate::utils::{
-    get_toolchain, run_command_with_output_and_env_no_err, rustc_toolchain_version_info,
-    rustc_version_info,
-};
-
-use std::collections::HashMap;
-use std::ffi::OsStr;
-use std::path::PathBuf;
-
-fn args() -> Result<Option<Vec<String>>, String> {
-    // We skip the binary and the "cargo" option.
-    if let Some("--help") = std::env::args().skip(2).next().as_deref() {
-        usage();
-        return Ok(None);
-    }
-    let args = std::env::args().skip(2).collect::<Vec<_>>();
-    if args.is_empty() {
-        return Err(
-            "Expected at least one argument for `cargo` subcommand, found none".to_string(),
-        );
-    }
-    Ok(Some(args))
-}
-
-fn usage() {
-    println!(
-        r#"
-`cargo` command help:
-
-    [args]     : Arguments to be passed to the cargo command
-    --help     : Show this help
-"#
-    )
-}
-
-pub fn run() -> Result<(), String> {
-    let args = match args()? {
-        Some(a) => a,
-        None => return Ok(()),
-    };
-
-    // We first need to go to the original location to ensure that the config setup will go as
-    // expected.
-    let current_dir = std::env::current_dir()
-        .and_then(|path| path.canonicalize())
-        .map_err(|error| format!("Failed to get current directory path: {:?}", error))?;
-    let current_exe = std::env::current_exe()
-        .and_then(|path| path.canonicalize())
-        .map_err(|error| format!("Failed to get current exe path: {:?}", error))?;
-    let mut parent_dir = current_exe
-        .components()
-        .map(|comp| comp.as_os_str())
-        .collect::<Vec<_>>();
-    // We run this script from "build_system/target/release/y", so we need to remove these elements.
-    for to_remove in &["y", "release", "target", "build_system"] {
-        if parent_dir
-            .last()
-            .map(|part| part == to_remove)
-            .unwrap_or(false)
-        {
-            parent_dir.pop();
-        } else {
-            return Err(format!(
-                "Build script not executed from `build_system/target/release/y` (in path {})",
-                current_exe.display(),
-            ));
-        }
-    }
-    let parent_dir = PathBuf::from(parent_dir.join(&OsStr::new("/")));
-    std::env::set_current_dir(&parent_dir).map_err(|error| {
-        format!(
-            "Failed to go to `{}` folder: {:?}",
-            parent_dir.display(),
-            error
-        )
-    })?;
-
-    let mut env: HashMap<String, String> = std::env::vars().collect();
-    ConfigInfo::default().setup(&mut env, false)?;
-    let toolchain = get_toolchain()?;
-
-    let toolchain_version = rustc_toolchain_version_info(&toolchain)?;
-    let default_version = rustc_version_info(None)?;
-    if toolchain_version != default_version {
-        println!(
-            "rustc_codegen_gcc is built for {} but the default rustc version is {}.",
-            toolchain_version.short, default_version.short,
-        );
-        println!("Using {}.", toolchain_version.short);
-    }
-
-    // We go back to the original folder since we now have set up everything we needed.
-    std::env::set_current_dir(&current_dir).map_err(|error| {
-        format!(
-            "Failed to go back to `{}` folder: {:?}",
-            current_dir.display(),
-            error
-        )
-    })?;
-
-    let rustflags = env.get("RUSTFLAGS").cloned().unwrap_or_default();
-    env.insert("RUSTDOCFLAGS".to_string(), rustflags);
-    let toolchain = format!("+{}", toolchain);
-    let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &toolchain];
-    for arg in &args {
-        command.push(arg);
-    }
-    if run_command_with_output_and_env_no_err(&command, None, Some(&env)).is_err() {
-        std::process::exit(1);
-    }
-
-    Ok(())
-}
diff --git a/compiler/rustc_codegen_gcc/build_system/src/clean.rs b/compiler/rustc_codegen_gcc/build_system/src/clean.rs
index cd8e691a0ed9f..55f55acf73ea0 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/clean.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/clean.rs
@@ -1,4 +1,4 @@
-use crate::utils::{remove_file, run_command};
+use crate::utils::{get_sysroot_dir, remove_file, run_command};
 
 use std::fs::remove_dir_all;
 use std::path::Path;
@@ -42,11 +42,12 @@ fn usage() {
 }
 
 fn clean_all() -> Result<(), String> {
+    let build_sysroot = get_sysroot_dir();
     let dirs_to_remove = [
-        "target",
-        "build_sysroot/sysroot",
-        "build_sysroot/sysroot_src",
-        "build_sysroot/target",
+        "target".into(),
+        build_sysroot.join("sysroot"),
+        build_sysroot.join("sysroot_src"),
+        build_sysroot.join("target"),
     ];
     for dir in dirs_to_remove {
         let _ = remove_dir_all(dir);
@@ -56,10 +57,11 @@ fn clean_all() -> Result<(), String> {
         let _ = remove_dir_all(Path::new(crate::BUILD_DIR).join(dir));
     }
 
-    let files_to_remove = ["build_sysroot/Cargo.lock", "perf.data", "perf.data.old"];
+    let files_to_remove =
+        [build_sysroot.join("Cargo.lock"), "perf.data".into(), "perf.data.old".into()];
 
     for file in files_to_remove {
-        let _ = remove_file(file);
+        let _ = remove_file(&file);
     }
 
     println!("Successfully ran `clean all`");
diff --git a/compiler/rustc_codegen_gcc/build_system/src/config.rs b/compiler/rustc_codegen_gcc/build_system/src/config.rs
index 34c92a3485ed6..965aedd8be891 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/config.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/config.rs
@@ -1,5 +1,6 @@
 use crate::utils::{
-    create_symlink, get_os_name, run_command_with_output, rustc_version_info, split_args,
+    create_dir, create_symlink, get_os_name, get_sysroot_dir, run_command_with_output,
+    rustc_version_info, split_args,
 };
 use std::collections::HashMap;
 use std::env as std_env;
@@ -26,11 +27,7 @@ impl Channel {
 }
 
 fn failed_config_parsing(config_file: &Path, err: &str) -> Result<ConfigFile, String> {
-    Err(format!(
-        "Failed to parse `{}`: {}",
-        config_file.display(),
-        err
-    ))
+    Err(format!("Failed to parse `{}`: {}", config_file.display(), err))
 }
 
 #[derive(Default)]
@@ -48,11 +45,7 @@ impl ConfigFile {
             )
         })?;
         let toml = Toml::parse(&content).map_err(|err| {
-            format!(
-                "Error occurred around `{}`: {:?}",
-                &content[err.start..=err.end],
-                err.kind
-            )
+            format!("Error occurred around `{}`: {:?}", &content[err.start..=err.end], err.kind)
         })?;
         let mut config = Self::default();
         for (key, value) in toml.iter() {
@@ -181,11 +174,7 @@ impl ConfigInfo {
             },
             "--use-backend" => match args.next() {
                 Some(backend) if !backend.is_empty() => self.backend = Some(backend),
-                _ => {
-                    return Err(
-                        "Expected an argument after `--use-backend`, found nothing".into()
-                    )
-                }
+                _ => return Err("Expected an argument after `--use-backend`, found nothing".into()),
             },
             "--no-default-features" => self.no_default_features = true,
             _ => return Ok(false),
@@ -228,20 +217,10 @@ impl ConfigInfo {
 
         let output_dir = output_dir.join(&commit);
         if !output_dir.is_dir() {
-            std::fs::create_dir_all(&output_dir).map_err(|err| {
-                format!(
-                    "failed to create folder `{}`: {:?}",
-                    output_dir.display(),
-                    err,
-                )
-            })?;
+            create_dir(&output_dir)?;
         }
         let output_dir = output_dir.canonicalize().map_err(|err| {
-            format!(
-                "Failed to get absolute path of `{}`: {:?}",
-                output_dir.display(),
-                err
-            )
+            format!("Failed to get absolute path of `{}`: {:?}", output_dir.display(), err)
         })?;
 
         let libgccjit_so_name = "libgccjit.so";
@@ -252,13 +231,7 @@ impl ConfigInfo {
             let tempfile = output_dir.join(&tempfile_name);
             let is_in_ci = std::env::var("GITHUB_ACTIONS").is_ok();
 
-            let url = format!(
-                "https://github.com/antoyo/gcc/releases/download/master-{}/libgccjit.so",
-                commit,
-            );
-
-            println!("Downloading `{}`...", url);
-            download_gccjit(url, &output_dir, tempfile_name, !is_in_ci)?;
+            download_gccjit(&commit, &output_dir, tempfile_name, !is_in_ci)?;
 
             let libgccjit_so = output_dir.join(libgccjit_so_name);
             // If we reach this point, it means the file was correctly downloaded, so let's
@@ -275,10 +248,7 @@ impl ConfigInfo {
             println!("Downloaded libgccjit.so version {} successfully!", commit);
             // We need to create a link named `libgccjit.so.0` because that's what the linker is
             // looking for.
-            create_symlink(
-                &libgccjit_so,
-                output_dir.join(&format!("{}.0", libgccjit_so_name)),
-            )?;
+            create_symlink(&libgccjit_so, output_dir.join(&format!("{}.0", libgccjit_so_name)))?;
         }
 
         self.gcc_path = output_dir.display().to_string();
@@ -298,10 +268,7 @@ impl ConfigInfo {
             Some(config_file) => config_file.into(),
             None => self.compute_path("config.toml"),
         };
-        let ConfigFile {
-            gcc_path,
-            download_gccjit,
-        } = ConfigFile::new(&config_file)?;
+        let ConfigFile { gcc_path, download_gccjit } = ConfigFile::new(&config_file)?;
 
         if let Some(true) = download_gccjit {
             self.download_gccjit_if_needed()?;
@@ -310,10 +277,7 @@ impl ConfigInfo {
         self.gcc_path = match gcc_path {
             Some(path) => path,
             None => {
-                return Err(format!(
-                    "missing `gcc-path` value from `{}`",
-                    config_file.display(),
-                ))
+                return Err(format!("missing `gcc-path` value from `{}`", config_file.display(),))
             }
         };
         Ok(())
@@ -393,15 +357,16 @@ impl ConfigInfo {
             .join(&format!("librustc_codegen_gcc.{}", self.dylib_ext))
             .display()
             .to_string();
-        self.sysroot_path = current_dir
-            .join("build_sysroot/sysroot")
-            .display()
-            .to_string();
+        self.sysroot_path =
+            current_dir.join(&get_sysroot_dir()).join("sysroot").display().to_string();
         if let Some(backend) = &self.backend {
+            // This option is only used in the rust compiler testsuite. The sysroot is handled
+            // by its build system directly so no need to set it ourselves.
             rustflags.push(format!("-Zcodegen-backend={}", backend));
         } else {
             rustflags.extend_from_slice(&[
-                "--sysroot".to_string(), self.sysroot_path.clone(),
+                "--sysroot".to_string(),
+                self.sysroot_path.clone(),
                 format!("-Zcodegen-backend={}", self.cg_backend_path),
             ]);
         }
@@ -422,13 +387,6 @@ impl ConfigInfo {
             rustflags.push("-Csymbol-mangling-version=v0".to_string());
         }
 
-        rustflags.push("-Cdebuginfo=2".to_string());
-
-        // Since we don't support ThinLTO, disable LTO completely when not trying to do LTO.
-        // TODO(antoyo): remove when we can handle ThinLTO.
-        if !env.contains_key(&"FAT_LTO".to_string()) {
-            rustflags.push("-Clto=off".to_string());
-        }
         // FIXME(antoyo): remove once the atomic shim is gone
         if os_name == "Darwin" {
             rustflags.extend_from_slice(&[
@@ -440,10 +398,9 @@ impl ConfigInfo {
         // display metadata load errors
         env.insert("RUSTC_LOG".to_string(), "warn".to_string());
 
-        let sysroot = current_dir.join(&format!(
-            "build_sysroot/sysroot/lib/rustlib/{}/lib",
-            self.target_triple,
-        ));
+        let sysroot = current_dir
+            .join(&get_sysroot_dir())
+            .join(&format!("sysroot/lib/rustlib/{}/lib", self.target_triple));
         let ld_library_path = format!(
             "{target}:{sysroot}:{gcc_path}",
             target = self.cargo_target_dir,
@@ -501,11 +458,27 @@ impl ConfigInfo {
 }
 
 fn download_gccjit(
-    url: String,
+    commit: &str,
     output_dir: &Path,
     tempfile_name: String,
     with_progress_bar: bool,
 ) -> Result<(), String> {
+    let url = if std::env::consts::OS == "linux" && std::env::consts::ARCH == "x86_64" {
+        format!("https://github.com/rust-lang/gcc/releases/download/master-{}/libgccjit.so", commit)
+    } else {
+        eprintln!(
+            "\
+Pre-compiled libgccjit.so not available for this os or architecture.
+Please compile it yourself and update the `config.toml` file
+to `download-gccjit = false` and set `gcc-path` to the appropriate directory."
+        );
+        return Err(String::from(
+            "no appropriate pre-compiled libgccjit.so available for download",
+        ));
+    };
+
+    println!("Downloading `{}`...", url);
+
     // Try curl. If that fails and we are on windows, fallback to PowerShell.
     let mut ret = run_command_with_output(
         &[
@@ -521,11 +494,7 @@ fn download_gccjit(
             &"--retry",
             &"3",
             &"-SRfL",
-            if with_progress_bar {
-                &"--progress-bar"
-            } else {
-                &"-s"
-            },
+            if with_progress_bar { &"--progress-bar" } else { &"-s" },
             &url.as_str(),
         ],
         Some(&output_dir),
diff --git a/compiler/rustc_codegen_gcc/build_system/src/fmt.rs b/compiler/rustc_codegen_gcc/build_system/src/fmt.rs
new file mode 100644
index 0000000000000..43644ba19b38a
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/build_system/src/fmt.rs
@@ -0,0 +1,35 @@
+use crate::utils::run_command_with_output;
+use std::ffi::OsStr;
+use std::path::Path;
+
+fn show_usage() {
+    println!(
+        r#"
+`fmt` command help:
+
+    --check                : Pass `--check` argument to `cargo fmt` commands
+    --help                 : Show this help"#
+    );
+}
+
+pub fn run() -> Result<(), String> {
+    let mut check = false;
+    // We skip binary name and the `info` command.
+    let mut args = std::env::args().skip(2);
+    while let Some(arg) = args.next() {
+        match arg.as_str() {
+            "--help" => {
+                show_usage();
+                return Ok(());
+            }
+            "--check" => check = true,
+            _ => return Err(format!("Unknown option {}", arg)),
+        }
+    }
+
+    let cmd: &[&dyn AsRef<OsStr>] =
+        if check { &[&"cargo", &"fmt", &"--check"] } else { &[&"cargo", &"fmt"] };
+
+    run_command_with_output(cmd, Some(&Path::new(".")))?;
+    run_command_with_output(cmd, Some(&Path::new("build_system")))
+}
diff --git a/compiler/rustc_codegen_gcc/build_system/src/main.rs b/compiler/rustc_codegen_gcc/build_system/src/main.rs
index 48ffbc7a9075a..d678fd75344d5 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/main.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/main.rs
@@ -2,12 +2,13 @@ use std::env;
 use std::process;
 
 mod build;
-mod cargo;
 mod clean;
 mod clone_gcc;
 mod config;
+mod fmt;
 mod info;
 mod prepare;
+mod rust_tools;
 mod rustc_info;
 mod test;
 mod utils;
@@ -26,16 +27,23 @@ macro_rules! arg_error {
 fn usage() {
     println!(
         "\
-Available commands for build_system:
+rustc_codegen_gcc build system
 
-    cargo     : Run cargo command
-    clean     : Run clean command
-    prepare   : Run prepare command
-    build     : Run build command
-    test      : Run test command
-    info      : Run info command
-    clone-gcc : Run clone-gcc command
-    --help    : Show this message"
+Usage: build_system [command] [options]
+
+Options:
+        --help    : Displays this help message.
+
+Commands:
+        cargo     : Executes a cargo command. 
+        rustc     : Compiles the program using the GCC compiler.
+        clean     : Cleans the build directory, removing all compiled files and artifacts.
+        prepare   : Prepares the environment for building, including fetching dependencies and setting up configurations.
+        build     : Compiles the project. 
+        test      : Runs tests for the project.
+        info      : Displays information about the build environment and project configuration.
+        clone-gcc : Clones the GCC compiler from a specified source.
+        fmt       : Runs rustfmt"
     );
 }
 
@@ -45,8 +53,10 @@ pub enum Command {
     CloneGcc,
     Prepare,
     Build,
+    Rustc,
     Test,
     Info,
+    Fmt,
 }
 
 fn main() {
@@ -56,12 +66,14 @@ fn main() {
 
     let command = match env::args().nth(1).as_deref() {
         Some("cargo") => Command::Cargo,
+        Some("rustc") => Command::Rustc,
         Some("clean") => Command::Clean,
         Some("prepare") => Command::Prepare,
         Some("build") => Command::Build,
         Some("test") => Command::Test,
         Some("info") => Command::Info,
         Some("clone-gcc") => Command::CloneGcc,
+        Some("fmt") => Command::Fmt,
         Some("--help") => {
             usage();
             process::exit(0);
@@ -75,13 +87,15 @@ fn main() {
     };
 
     if let Err(e) = match command {
-        Command::Cargo => cargo::run(),
+        Command::Cargo => rust_tools::run_cargo(),
+        Command::Rustc => rust_tools::run_rustc(),
         Command::Clean => clean::run(),
         Command::Prepare => prepare::run(),
         Command::Build => build::run(),
         Command::Test => test::run(),
         Command::Info => info::run(),
         Command::CloneGcc => clone_gcc::run(),
+        Command::Fmt => fmt::run(),
     } {
         eprintln!("Command failed to run: {e}");
         process::exit(1);
diff --git a/compiler/rustc_codegen_gcc/build_system/src/prepare.rs b/compiler/rustc_codegen_gcc/build_system/src/prepare.rs
index 821c793c7e554..00aa632165e22 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/prepare.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/prepare.rs
@@ -1,58 +1,58 @@
 use crate::rustc_info::get_rustc_path;
 use crate::utils::{
-    cargo_install, git_clone_root_dir, remove_file, run_command, run_command_with_output, walk_dir,
+    cargo_install, create_dir, get_sysroot_dir, git_clone_root_dir, remove_file, run_command,
+    run_command_with_output, walk_dir,
 };
 
 use std::fs;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 fn prepare_libcore(
     sysroot_path: &Path,
     libgccjit12_patches: bool,
     cross_compile: bool,
+    sysroot_source: Option<String>,
 ) -> Result<(), String> {
-    let rustc_path = match get_rustc_path() {
-        Some(path) => path,
-        None => return Err("`rustc` path not found".to_string()),
-    };
+    let rustlib_dir: PathBuf;
 
-    let parent = match rustc_path.parent() {
-        Some(path) => path,
-        None => return Err(format!("No parent for `{}`", rustc_path.display())),
-    };
+    if let Some(path) = sysroot_source {
+        rustlib_dir = Path::new(&path)
+            .canonicalize()
+            .map_err(|error| format!("Failed to canonicalize path: {:?}", error))?;
+        if !rustlib_dir.is_dir() {
+            return Err(format!("Custom sysroot path {:?} not found", rustlib_dir));
+        }
+    } else {
+        let rustc_path = match get_rustc_path() {
+            Some(path) => path,
+            None => return Err("`rustc` path not found".to_string()),
+        };
+
+        let parent = match rustc_path.parent() {
+            Some(path) => path,
+            None => return Err(format!("No parent for `{}`", rustc_path.display())),
+        };
 
-    let rustlib_dir = parent
-        .join("../lib/rustlib/src/rust")
-        .canonicalize()
-        .map_err(|error| format!("Failed to canonicalize path: {:?}", error))?;
-    if !rustlib_dir.is_dir() {
-        return Err("Please install `rust-src` component".to_string());
+        rustlib_dir = parent
+            .join("../lib/rustlib/src/rust")
+            .canonicalize()
+            .map_err(|error| format!("Failed to canonicalize path: {:?}", error))?;
+        if !rustlib_dir.is_dir() {
+            return Err("Please install `rust-src` component".to_string());
+        }
     }
 
     let sysroot_dir = sysroot_path.join("sysroot_src");
     if sysroot_dir.is_dir() {
         if let Err(error) = fs::remove_dir_all(&sysroot_dir) {
-            return Err(format!(
-                "Failed to remove `{}`: {:?}",
-                sysroot_dir.display(),
-                error,
-            ));
+            return Err(format!("Failed to remove `{}`: {:?}", sysroot_dir.display(), error,));
         }
     }
 
     let sysroot_library_dir = sysroot_dir.join("library");
-    fs::create_dir_all(&sysroot_library_dir).map_err(|error| {
-        format!(
-            "Failed to create folder `{}`: {:?}",
-            sysroot_library_dir.display(),
-            error,
-        )
-    })?;
+    create_dir(&sysroot_library_dir)?;
 
-    run_command(
-        &[&"cp", &"-r", &rustlib_dir.join("library"), &sysroot_dir],
-        None,
-    )?;
+    run_command(&[&"cp", &"-r", &rustlib_dir.join("library"), &sysroot_dir], None)?;
 
     println!("[GIT] init (cwd): `{}`", sysroot_dir.display());
     run_command(&[&"git", &"init"], Some(&sysroot_dir))?;
@@ -63,70 +63,52 @@ fn prepare_libcore(
     // This is needed on systems where nothing is configured.
     // git really needs something here, or it will fail.
     // Even using --author is not enough.
-    run_command(
-        &[&"git", &"config", &"user.email", &"none@example.com"],
-        Some(&sysroot_dir),
-    )?;
-    run_command(
-        &[&"git", &"config", &"user.name", &"None"],
-        Some(&sysroot_dir),
-    )?;
-    run_command(
-        &[&"git", &"config", &"core.autocrlf", &"false"],
-        Some(&sysroot_dir),
-    )?;
-    run_command(
-        &[&"git", &"config", &"commit.gpgSign", &"false"],
-        Some(&sysroot_dir),
-    )?;
-    run_command(
-        &[&"git", &"commit", &"-m", &"Initial commit", &"-q"],
-        Some(&sysroot_dir),
-    )?;
+    run_command(&[&"git", &"config", &"user.email", &"none@example.com"], Some(&sysroot_dir))?;
+    run_command(&[&"git", &"config", &"user.name", &"None"], Some(&sysroot_dir))?;
+    run_command(&[&"git", &"config", &"core.autocrlf", &"false"], Some(&sysroot_dir))?;
+    run_command(&[&"git", &"config", &"commit.gpgSign", &"false"], Some(&sysroot_dir))?;
+    run_command(&[&"git", &"commit", &"-m", &"Initial commit", &"-q"], Some(&sysroot_dir))?;
 
     let mut patches = Vec::new();
     walk_dir(
         "patches",
-        |_| Ok(()),
-        |file_path: &Path| {
+        &mut |_| Ok(()),
+        &mut |file_path: &Path| {
             patches.push(file_path.to_path_buf());
             Ok(())
         },
+        false,
     )?;
     if cross_compile {
         walk_dir(
             "patches/cross_patches",
-            |_| Ok(()),
-            |file_path: &Path| {
+            &mut |_| Ok(()),
+            &mut |file_path: &Path| {
                 patches.push(file_path.to_path_buf());
                 Ok(())
             },
+            false,
         )?;
     }
     if libgccjit12_patches {
         walk_dir(
             "patches/libgccjit12",
-            |_| Ok(()),
-            |file_path: &Path| {
+            &mut |_| Ok(()),
+            &mut |file_path: &Path| {
                 patches.push(file_path.to_path_buf());
                 Ok(())
             },
+            false,
         )?;
     }
     patches.sort();
     for file_path in patches {
         println!("[GIT] apply `{}`", file_path.display());
-        let path = Path::new("../..").join(file_path);
+        let path = Path::new("../../..").join(file_path);
         run_command_with_output(&[&"git", &"apply", &path], Some(&sysroot_dir))?;
         run_command_with_output(&[&"git", &"add", &"-A"], Some(&sysroot_dir))?;
         run_command_with_output(
-            &[
-                &"git",
-                &"commit",
-                &"--no-gpg-sign",
-                &"-m",
-                &format!("Patch {}", path.display()),
-            ],
+            &[&"git", &"commit", &"--no-gpg-sign", &"-m", &format!("Patch {}", path.display())],
             Some(&sysroot_dir),
         )?;
     }
@@ -145,13 +127,7 @@ fn prepare_rand() -> Result<(), String> {
     run_command_with_output(&[&"git", &"apply", &path], Some(rand_dir))?;
     run_command_with_output(&[&"git", &"add", &"-A"], Some(rand_dir))?;
     run_command_with_output(
-        &[
-            &"git",
-            &"commit",
-            &"--no-gpg-sign",
-            &"-m",
-            &format!("Patch {}", path.display()),
-        ],
+        &[&"git", &"commit", &"--no-gpg-sign", &"-m", &format!("Patch {}", path.display())],
         Some(rand_dir),
     )?;
 
@@ -165,10 +141,7 @@ fn build_raytracer(repo_dir: &Path) -> Result<(), String> {
     if mv_target.is_file() {
         remove_file(&mv_target)?;
     }
-    run_command(
-        &[&"mv", &"target/debug/main", &"raytracer_cg_llvm"],
-        Some(repo_dir),
-    )?;
+    run_command(&[&"mv", &"target/debug/main", &"raytracer_cg_llvm"], Some(repo_dir))?;
     Ok(())
 }
 
@@ -193,6 +166,7 @@ struct PrepareArg {
     cross_compile: bool,
     only_libcore: bool,
     libgccjit12_patches: bool,
+    sysroot_source: Option<String>,
 }
 
 impl PrepareArg {
@@ -200,12 +174,23 @@ impl PrepareArg {
         let mut only_libcore = false;
         let mut cross_compile = false;
         let mut libgccjit12_patches = false;
+        let mut sysroot_source = None;
 
-        for arg in std::env::args().skip(2) {
+        let mut args = std::env::args().skip(2);
+        while let Some(arg) = args.next() {
             match arg.as_str() {
                 "--only-libcore" => only_libcore = true,
                 "--cross" => cross_compile = true,
                 "--libgccjit12-patches" => libgccjit12_patches = true,
+                "--sysroot-source" => {
+                    if let Some(path) = args.next() {
+                        sysroot_source = Some(path);
+                    } else {
+                        return Err(
+                            "Expected a value after `--sysroot-source`, found nothing".to_string()
+                        );
+                    }
+                }
                 "--help" => {
                     Self::usage();
                     return Ok(None);
@@ -213,11 +198,7 @@ impl PrepareArg {
                 a => return Err(format!("Unknown argument `{a}`")),
             }
         }
-        Ok(Some(Self {
-            cross_compile,
-            only_libcore,
-            libgccjit12_patches,
-        }))
+        Ok(Some(Self { cross_compile, only_libcore, libgccjit12_patches, sysroot_source }))
     }
 
     fn usage() {
@@ -228,6 +209,7 @@ impl PrepareArg {
     --only-libcore           : Only setup libcore and don't clone other repositories
     --cross                  : Apply the patches needed to do cross-compilation
     --libgccjit12-patches    : Apply patches needed for libgccjit12
+    --sysroot-source         : Specify custom path for sysroot source
     --help                   : Show this help"#
         )
     }
@@ -238,8 +220,13 @@ pub fn run() -> Result<(), String> {
         Some(a) => a,
         None => return Ok(()),
     };
-    let sysroot_path = Path::new("build_sysroot");
-    prepare_libcore(sysroot_path, args.libgccjit12_patches, args.cross_compile)?;
+    let sysroot_path = get_sysroot_dir();
+    prepare_libcore(
+        &sysroot_path,
+        args.libgccjit12_patches,
+        args.cross_compile,
+        args.sysroot_source,
+    )?;
 
     if !args.only_libcore {
         cargo_install("hyperfine")?;
diff --git a/compiler/rustc_codegen_gcc/build_system/src/rust_tools.rs b/compiler/rustc_codegen_gcc/build_system/src/rust_tools.rs
new file mode 100644
index 0000000000000..242fa7ef94982
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/build_system/src/rust_tools.rs
@@ -0,0 +1,125 @@
+use crate::config::ConfigInfo;
+use crate::utils::{
+    get_toolchain, run_command_with_output_and_env_no_err, rustc_toolchain_version_info,
+    rustc_version_info,
+};
+
+use std::collections::HashMap;
+use std::ffi::OsStr;
+use std::path::PathBuf;
+
+fn args(command: &str) -> Result<Option<Vec<String>>, String> {
+    // We skip the binary and the "cargo"/"rustc" option.
+    if let Some("--help") = std::env::args().skip(2).next().as_deref() {
+        usage(command);
+        return Ok(None);
+    }
+    let args = std::env::args().skip(2).collect::<Vec<_>>();
+    if args.is_empty() {
+        return Err(format!(
+            "Expected at least one argument for `{}` subcommand, found none",
+            command
+        ));
+    }
+    Ok(Some(args))
+}
+
+fn usage(command: &str) {
+    println!(
+        r#"
+`{}` command help:
+
+    [args]     : Arguments to be passed to the cargo command
+    --help     : Show this help
+"#,
+        command,
+    )
+}
+
+struct RustcTools {
+    env: HashMap<String, String>,
+    args: Vec<String>,
+    toolchain: String,
+    config: ConfigInfo,
+}
+
+impl RustcTools {
+    fn new(command: &str) -> Result<Option<Self>, String> {
+        let Some(args) = args(command)? else { return Ok(None) };
+
+        // We first need to go to the original location to ensure that the config setup will go as
+        // expected.
+        let current_dir = std::env::current_dir()
+            .and_then(|path| path.canonicalize())
+            .map_err(|error| format!("Failed to get current directory path: {:?}", error))?;
+        let current_exe = std::env::current_exe()
+            .and_then(|path| path.canonicalize())
+            .map_err(|error| format!("Failed to get current exe path: {:?}", error))?;
+        let mut parent_dir =
+            current_exe.components().map(|comp| comp.as_os_str()).collect::<Vec<_>>();
+        // We run this script from "build_system/target/release/y", so we need to remove these elements.
+        for to_remove in &["y", "release", "target", "build_system"] {
+            if parent_dir.last().map(|part| part == to_remove).unwrap_or(false) {
+                parent_dir.pop();
+            } else {
+                return Err(format!(
+                    "Build script not executed from `build_system/target/release/y` (in path {})",
+                    current_exe.display(),
+                ));
+            }
+        }
+        let parent_dir = PathBuf::from(parent_dir.join(&OsStr::new("/")));
+        std::env::set_current_dir(&parent_dir).map_err(|error| {
+            format!("Failed to go to `{}` folder: {:?}", parent_dir.display(), error)
+        })?;
+
+        let mut env: HashMap<String, String> = std::env::vars().collect();
+        let mut config = ConfigInfo::default();
+        config.setup(&mut env, false)?;
+        let toolchain = get_toolchain()?;
+
+        let toolchain_version = rustc_toolchain_version_info(&toolchain)?;
+        let default_version = rustc_version_info(None)?;
+        if toolchain_version != default_version {
+            println!(
+                "rustc_codegen_gcc is built for {} but the default rustc version is {}.",
+                toolchain_version.short, default_version.short,
+            );
+            println!("Using {}.", toolchain_version.short);
+        }
+
+        // We go back to the original folder since we now have set up everything we needed.
+        std::env::set_current_dir(&current_dir).map_err(|error| {
+            format!("Failed to go back to `{}` folder: {:?}", current_dir.display(), error)
+        })?;
+        let toolchain = format!("+{}", toolchain);
+        Ok(Some(Self { toolchain, args, env, config }))
+    }
+}
+
+pub fn run_cargo() -> Result<(), String> {
+    let Some(mut tools) = RustcTools::new("cargo")? else { return Ok(()) };
+    let rustflags = tools.env.get("RUSTFLAGS").cloned().unwrap_or_default();
+    tools.env.insert("RUSTDOCFLAGS".to_string(), rustflags);
+    let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &tools.toolchain];
+    for arg in &tools.args {
+        command.push(arg);
+    }
+    if run_command_with_output_and_env_no_err(&command, None, Some(&tools.env)).is_err() {
+        std::process::exit(1);
+    }
+
+    Ok(())
+}
+
+pub fn run_rustc() -> Result<(), String> {
+    let Some(tools) = RustcTools::new("rustc")? else { return Ok(()) };
+    let mut command = tools.config.rustc_command_vec();
+    for arg in &tools.args {
+        command.push(arg);
+    }
+    if run_command_with_output_and_env_no_err(&command, None, Some(&tools.env)).is_err() {
+        std::process::exit(1);
+    }
+    Ok(())
+}
diff --git a/compiler/rustc_codegen_gcc/build_system/src/test.rs b/compiler/rustc_codegen_gcc/build_system/src/test.rs
index 0895dc6bff700..8d088a3aac318 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/test.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/test.rs
@@ -1,13 +1,14 @@
 use crate::build;
 use crate::config::{Channel, ConfigInfo};
 use crate::utils::{
-    get_toolchain, git_clone, git_clone_root_dir, remove_file, run_command, run_command_with_env,
-    run_command_with_output_and_env, rustc_version_info, split_args, walk_dir,
+    create_dir, get_sysroot_dir, get_toolchain, git_clone, git_clone_root_dir, remove_file,
+    run_command, run_command_with_env, run_command_with_output_and_env, rustc_version_info,
+    split_args, walk_dir,
 };
 
-use std::collections::{BTreeSet, HashMap};
+use std::collections::HashMap;
 use std::ffi::OsStr;
-use std::fs::{create_dir_all, remove_dir_all, File};
+use std::fs::{remove_dir_all, File};
 use std::io::{BufRead, BufReader};
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
@@ -19,46 +20,27 @@ type Runners = HashMap<&'static str, (&'static str, Runner)>;
 fn get_runners() -> Runners {
     let mut runners = HashMap::new();
 
+    runners.insert("--test-rustc", ("Run all rustc tests", test_rustc as Runner));
+    runners
+        .insert("--test-successful-rustc", ("Run successful rustc tests", test_successful_rustc));
     runners.insert(
-        "--test-rustc",
-        ("Run all rustc tests", test_rustc as Runner),
-    );
-    runners.insert(
-        "--test-successful-rustc",
-        ("Run successful rustc tests", test_successful_rustc),
-    );
-    runners.insert(
-        "--test-failing-rustc",
-        ("Run failing rustc tests", test_failing_rustc),
-    );
-    runners.insert(
-        "--projects",
-        ("Run the tests of popular crates", test_projects),
+        "--test-failing-ui-pattern-tests",
+        ("Run failing ui pattern tests", test_failing_ui_pattern_tests),
     );
+    runners.insert("--test-failing-rustc", ("Run failing rustc tests", test_failing_rustc));
+    runners.insert("--projects", ("Run the tests of popular crates", test_projects));
     runners.insert("--test-libcore", ("Run libcore tests", test_libcore));
     runners.insert("--clean", ("Empty cargo target directory", clean));
     runners.insert("--build-sysroot", ("Build sysroot", build_sysroot));
     runners.insert("--std-tests", ("Run std tests", std_tests));
     runners.insert("--asm-tests", ("Run asm tests", asm_tests));
-    runners.insert(
-        "--extended-tests",
-        ("Run extended sysroot tests", extended_sysroot_tests),
-    );
-    runners.insert(
-        "--extended-rand-tests",
-        ("Run extended rand tests", extended_rand_tests),
-    );
+    runners.insert("--extended-tests", ("Run extended sysroot tests", extended_sysroot_tests));
+    runners.insert("--extended-rand-tests", ("Run extended rand tests", extended_rand_tests));
     runners.insert(
         "--extended-regex-example-tests",
-        (
-            "Run extended regex example tests",
-            extended_regex_example_tests,
-        ),
-    );
-    runners.insert(
-        "--extended-regex-tests",
-        ("Run extended regex tests", extended_regex_tests),
+        ("Run extended regex example tests", extended_regex_example_tests),
     );
+    runners.insert("--extended-regex-tests", ("Run extended regex tests", extended_regex_tests));
     runners.insert("--mini-tests", ("Run mini tests", mini_tests));
 
     runners
@@ -71,15 +53,9 @@ fn get_number_after_arg(
     match args.next() {
         Some(nb) if !nb.is_empty() => match usize::from_str(&nb) {
             Ok(nb) => Ok(nb),
-            Err(_) => Err(format!(
-                "Expected a number after `{}`, found `{}`",
-                option, nb
-            )),
+            Err(_) => Err(format!("Expected a number after `{}`, found `{}`", option, nb)),
         },
-        _ => Err(format!(
-            "Expected a number after `{}`, found nothing",
-            option
-        )),
+        _ => Err(format!("Expected a number after `{}`, found nothing", option)),
     }
 }
 
@@ -110,7 +86,7 @@ fn show_usage() {
 struct TestArg {
     build_only: bool,
     use_system_gcc: bool,
-    runners: BTreeSet<String>,
+    runners: Vec<String>,
     flags: Vec<String>,
     nb_parts: Option<usize>,
     current_part: Option<usize>,
@@ -130,9 +106,7 @@ impl TestArg {
             match arg.as_str() {
                 "--features" => match args.next() {
                     Some(feature) if !feature.is_empty() => {
-                        test_arg
-                            .flags
-                            .extend_from_slice(&["--features".into(), feature]);
+                        test_arg.flags.extend_from_slice(&["--features".into(), feature]);
                     }
                     _ => {
                         return Err("Expected an argument after `--features`, found nothing".into())
@@ -157,8 +131,10 @@ impl TestArg {
                     show_usage();
                     return Ok(None);
                 }
-                x if runners.contains_key(x) => {
-                    test_arg.runners.insert(x.into());
+                x if runners.contains_key(x)
+                    && !test_arg.runners.iter().any(|runner| runner == x) =>
+                {
+                    test_arg.runners.push(x.into());
                 }
                 arg => {
                     if !test_arg.config_info.parse_argument(arg, &mut args)? {
@@ -211,8 +187,7 @@ fn build_if_no_backend(env: &Env, args: &TestArg) -> Result<(), String> {
 fn clean(_env: &Env, args: &TestArg) -> Result<(), String> {
     let _ = std::fs::remove_dir_all(&args.config_info.cargo_target_dir);
     let path = Path::new(&args.config_info.cargo_target_dir).join("gccjit");
-    std::fs::create_dir_all(&path)
-        .map_err(|error| format!("failed to create folder `{}`: {:?}", path.display(), error))
+    create_dir(&path)
 }
 
 fn mini_tests(env: &Env, args: &TestArg) -> Result<(), String> {
@@ -304,13 +279,8 @@ fn maybe_run_command_in_vm(
     let sudo_command: &[&dyn AsRef<OsStr>] = &[&"sudo", &"cp", &exe, &vm_exe_path];
     run_command_with_env(sudo_command, None, Some(env))?;
 
-    let mut vm_command: Vec<&dyn AsRef<OsStr>> = vec![
-        &"sudo",
-        &"chroot",
-        &vm_dir,
-        &"qemu-m68k-static",
-        &inside_vm_exe_path,
-    ];
+    let mut vm_command: Vec<&dyn AsRef<OsStr>> =
+        vec![&"sudo", &"chroot", &vm_dir, &"qemu-m68k-static", &inside_vm_exe_path];
     vm_command.extend_from_slice(command);
     run_command_with_output_and_env(&vm_command, Some(&vm_parent_dir), Some(env))?;
     Ok(())
@@ -399,11 +369,7 @@ fn std_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     }
     run_command_with_env(&command, None, Some(env))?;
     maybe_run_command_in_vm(
-        &[
-            &cargo_target_dir.join("std_example"),
-            &"--target",
-            &args.config_info.target_triple,
-        ],
+        &[&cargo_target_dir.join("std_example"), &"--target", &args.config_info.target_triple],
         env,
         args,
     )?;
@@ -427,11 +393,7 @@ fn std_tests(env: &Env, args: &TestArg) -> Result<(), String> {
         command.push(test_flag);
     }
     run_command_with_env(&command, None, Some(env))?;
-    maybe_run_command_in_vm(
-        &[&cargo_target_dir.join("subslice-patterns-const-eval")],
-        env,
-        args,
-    )?;
+    maybe_run_command_in_vm(&[&cargo_target_dir.join("subslice-patterns-const-eval")], env, args)?;
 
     // FIXME: create a function "display_if_not_quiet" or something along the line.
     println!("[AOT] track-caller-attribute");
@@ -447,11 +409,7 @@ fn std_tests(env: &Env, args: &TestArg) -> Result<(), String> {
         command.push(test_flag);
     }
     run_command_with_env(&command, None, Some(env))?;
-    maybe_run_command_in_vm(
-        &[&cargo_target_dir.join("track-caller-attribute")],
-        env,
-        args,
-    )?;
+    maybe_run_command_in_vm(&[&cargo_target_dir.join("track-caller-attribute")], env, args)?;
 
     // FIXME: create a function "display_if_not_quiet" or something along the line.
     println!("[AOT] mod_bench");
@@ -477,11 +435,7 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<PathBuf, String> {
     );
     let rust_dir_path = Path::new(crate::BUILD_DIR).join("rust");
     // If the repository was already cloned, command will fail, so doesn't matter.
-    let _ = git_clone(
-        "https://github.com/rust-lang/rust.git",
-        Some(&rust_dir_path),
-        false,
-    );
+    let _ = git_clone("https://github.com/rust-lang/rust.git", Some(&rust_dir_path), false);
     let rust_dir: Option<&Path> = Some(&rust_dir_path);
     run_command(&[&"git", &"checkout", &"--", &"tests/"], rust_dir)?;
     run_command_with_output_and_env(&[&"git", &"fetch"], rust_dir, Some(env))?;
@@ -511,12 +465,8 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<PathBuf, String> {
         }
     })?;
     let rustc = String::from_utf8(
-        run_command_with_env(
-            &[&"rustup", &toolchain, &"which", &"rustc"],
-            rust_dir,
-            Some(env),
-        )?
-        .stdout,
+        run_command_with_env(&[&"rustup", &toolchain, &"which", &"rustc"], rust_dir, Some(env))?
+            .stdout,
     )
     .map_err(|error| format!("Failed to retrieve rustc path: {:?}", error))
     .and_then(|rustc| {
@@ -573,13 +523,7 @@ download-ci-llvm = false
             llvm_filecheck = llvm_filecheck.trim(),
         ),
     )
-    .map_err(|error| {
-        format!(
-            "Failed to write into `{}`: {:?}",
-            file_path.display(),
-            error
-        )
-    })?;
+    .map_err(|error| format!("Failed to write into `{}`: {:?}", file_path.display(), error))?;
     Ok(rust_dir_path)
 }
 
@@ -591,21 +535,19 @@ fn asm_tests(env: &Env, args: &TestArg) -> Result<(), String> {
 
     env.insert("COMPILETEST_FORCE_STAGE0".to_string(), "1".to_string());
 
-    let extra = if args.is_using_gcc_master_branch() {
-        ""
-    } else {
-        " -Csymbol-mangling-version=v0"
-    };
+    let extra =
+        if args.is_using_gcc_master_branch() { "" } else { " -Csymbol-mangling-version=v0" };
 
     let rustc_args = &format!(
         r#"-Zpanic-abort-tests \
             -Zcodegen-backend="{pwd}/target/{channel}/librustc_codegen_gcc.{dylib_ext}" \
-            --sysroot "{pwd}/build_sysroot/sysroot" -Cpanic=abort{extra}"#,
+            --sysroot "{sysroot_dir}" -Cpanic=abort{extra}"#,
         pwd = std::env::current_dir()
             .map_err(|error| format!("`current_dir` failed: {:?}", error))?
             .display(),
         channel = args.config_info.channel.as_str(),
         dylib_ext = args.config_info.dylib_ext,
+        sysroot_dir = args.config_info.sysroot_path,
         extra = extra,
     );
 
@@ -703,20 +645,23 @@ fn test_projects(env: &Env, args: &TestArg) -> Result<(), String> {
         //"https://github.com/rust-lang/cargo", // TODO: very slow, only run on master?
     ];
 
+    let mut env = env.clone();
+    let rustflags =
+        format!("{} --cap-lints allow", env.get("RUSTFLAGS").cloned().unwrap_or_default());
+    env.insert("RUSTFLAGS".to_string(), rustflags);
     let run_tests = |projects_path, iter: &mut dyn Iterator<Item = &&str>| -> Result<(), String> {
         for project in iter {
             let clone_result = git_clone_root_dir(project, projects_path, true)?;
             let repo_path = Path::new(&clone_result.repo_dir);
-            run_cargo_command(&[&"build", &"--release"], Some(repo_path), env, args)?;
-            run_cargo_command(&[&"test"], Some(repo_path), env, args)?;
+            run_cargo_command(&[&"build", &"--release"], Some(repo_path), &env, args)?;
+            run_cargo_command(&[&"test"], Some(repo_path), &env, args)?;
         }
 
         Ok(())
     };
 
     let projects_path = Path::new("projects");
-    create_dir_all(projects_path)
-        .map_err(|err| format!("Failed to create directory `projects`: {}", err))?;
+    create_dir(projects_path)?;
 
     let nb_parts = args.nb_parts.unwrap_or(0);
     if nb_parts > 0 {
@@ -737,9 +682,9 @@ fn test_projects(env: &Env, args: &TestArg) -> Result<(), String> {
 fn test_libcore(env: &Env, args: &TestArg) -> Result<(), String> {
     // FIXME: create a function "display_if_not_quiet" or something along the line.
     println!("[TEST] libcore");
-    let path = Path::new("build_sysroot/sysroot_src/library/core/tests");
+    let path = get_sysroot_dir().join("sysroot_src/library/core/tests");
     let _ = remove_dir_all(path.join("target"));
-    run_cargo_command(&[&"test"], Some(path), env, args)?;
+    run_cargo_command(&[&"test"], Some(&path), env, args)?;
     Ok(())
 }
 
@@ -763,10 +708,8 @@ fn extended_rand_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     }
     let mut env = env.clone();
     // newer aho_corasick versions throw a deprecation warning
-    let rustflags = format!(
-        "{} --cap-lints warn",
-        env.get("RUSTFLAGS").cloned().unwrap_or_default()
-    );
+    let rustflags =
+        format!("{} --cap-lints warn", env.get("RUSTFLAGS").cloned().unwrap_or_default());
     env.insert("RUSTFLAGS".to_string(), rustflags);
 
     let path = Path::new(crate::BUILD_DIR).join("rand");
@@ -788,18 +731,11 @@ fn extended_regex_example_tests(env: &Env, args: &TestArg) -> Result<(), String>
     println!("[TEST] rust-lang/regex example shootout-regex-dna");
     let mut env = env.clone();
     // newer aho_corasick versions throw a deprecation warning
-    let rustflags = format!(
-        "{} --cap-lints warn",
-        env.get("RUSTFLAGS").cloned().unwrap_or_default()
-    );
+    let rustflags =
+        format!("{} --cap-lints warn", env.get("RUSTFLAGS").cloned().unwrap_or_default());
     env.insert("RUSTFLAGS".to_string(), rustflags);
     // Make sure `[codegen mono items] start` doesn't poison the diff
-    run_cargo_command(
-        &[&"build", &"--example", &"shootout-regex-dna"],
-        Some(&path),
-        &env,
-        args,
-    )?;
+    run_cargo_command(&[&"build", &"--example", &"shootout-regex-dna"], Some(&path), &env, args)?;
 
     run_cargo_command_with_callback(
         &[&"run", &"--example", &"shootout-regex-dna"],
@@ -810,10 +746,8 @@ fn extended_regex_example_tests(env: &Env, args: &TestArg) -> Result<(), String>
             // FIXME: rewrite this with `child.stdin.write_all()` because
             // `examples/regexdna-input.txt` is very small.
             let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"bash", &"-c"];
-            let cargo_args = cargo_command
-                .iter()
-                .map(|s| s.as_ref().to_str().unwrap())
-                .collect::<Vec<_>>();
+            let cargo_args =
+                cargo_command.iter().map(|s| s.as_ref().to_str().unwrap()).collect::<Vec<_>>();
             let bash_command = format!(
                 "cat examples/regexdna-input.txt | {} | grep -v 'Spawned thread' > res.txt",
                 cargo_args.join(" "),
@@ -841,10 +775,8 @@ fn extended_regex_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     println!("[TEST] rust-lang/regex tests");
     let mut env = env.clone();
     // newer aho_corasick versions throw a deprecation warning
-    let rustflags = format!(
-        "{} --cap-lints warn",
-        env.get("RUSTFLAGS").cloned().unwrap_or_default()
-    );
+    let rustflags =
+        format!("{} --cap-lints warn", env.get("RUSTFLAGS").cloned().unwrap_or_default());
     env.insert("RUSTFLAGS".to_string(), rustflags);
     let path = Path::new(crate::BUILD_DIR).join("regex");
     run_cargo_command(
@@ -884,7 +816,7 @@ fn extended_sysroot_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     Ok(())
 }
 
-fn should_not_remove_test(file: &str) -> bool {
+fn valid_ui_error_pattern_test(file: &str) -> bool {
     // contains //~ERROR, but shouldn't be removed
     [
         "issues/auxiliary/issue-3136-a.rs",
@@ -899,7 +831,8 @@ fn should_not_remove_test(file: &str) -> bool {
     .any(|to_ignore| file.ends_with(to_ignore))
 }
 
-fn should_remove_test(file_path: &Path) -> Result<bool, String> {
+#[rustfmt::skip]
+fn contains_ui_error_patterns(file_path: &Path) -> Result<bool, String> {
     // Tests generating errors.
     let file = File::open(file_path)
         .map_err(|error| format!("Failed to read `{}`: {:?}", file_path.display(), error))?;
@@ -916,8 +849,8 @@ fn should_remove_test(file_path: &Path) -> Result<bool, String> {
             "//~",
             "thread",
         ]
-        .iter()
-        .any(|check| line.contains(check))
+            .iter()
+            .any(|check| line.contains(check))
         {
             return Ok(true);
         }
@@ -925,17 +858,27 @@ fn should_remove_test(file_path: &Path) -> Result<bool, String> {
             return Ok(true);
         }
     }
-    if file_path
-        .display()
-        .to_string()
-        .contains("ambiguous-4-extern.rs")
-    {
+    if file_path.display().to_string().contains("ambiguous-4-extern.rs") {
         eprintln!("nothing found for {file_path:?}");
     }
     Ok(false)
 }
 
-fn test_rustc_inner<F>(env: &Env, args: &TestArg, prepare_files_callback: F) -> Result<(), String>
+// # Parameters
+//
+// * `env`: An environment variable that provides context for the function.
+// * `args`: The arguments passed to the test. This could include things like the flags, config etc.
+// * `prepare_files_callback`: A callback function that prepares the files needed for the test. Its used to remove/retain tests giving Error to run various rust test suits.
+// * `run_error_pattern_test`: A boolean that determines whether to run only error pattern tests.
+// * `test_type`: A string that indicates the type of the test being run.
+//
+fn test_rustc_inner<F>(
+    env: &Env,
+    args: &TestArg,
+    prepare_files_callback: F,
+    run_error_pattern_test: bool,
+    test_type: &str,
+) -> Result<(), String>
 where
     F: Fn(&Path) -> Result<bool, String>,
 {
@@ -944,139 +887,138 @@ where
     let mut env = env.clone();
     let rust_path = setup_rustc(&mut env, args)?;
 
-    walk_dir(
-        rust_path.join("tests/ui"),
-        |dir| {
-            let dir_name = dir.file_name().and_then(|name| name.to_str()).unwrap_or("");
-            if [
-                "abi",
-                "extern",
-                "unsized-locals",
-                "proc-macro",
-                "threads-sendsync",
-                "borrowck",
-                "test-attrs",
-            ]
-            .iter()
-            .any(|name| *name == dir_name)
-            {
-                std::fs::remove_dir_all(dir).map_err(|error| {
-                    format!("Failed to remove folder `{}`: {:?}", dir.display(), error)
-                })?;
-            }
-            Ok(())
-        },
-        |_| Ok(()),
-    )?;
-
-    // These two functions are used to remove files that are known to not be working currently
-    // with the GCC backend to reduce noise.
-    fn dir_handling(dir: &Path) -> Result<(), String> {
-        if dir
-            .file_name()
-            .map(|name| name == "auxiliary")
-            .unwrap_or(true)
-        {
-            return Ok(());
-        }
-        walk_dir(dir, dir_handling, file_handling)
-    }
-    fn file_handling(file_path: &Path) -> Result<(), String> {
-        if !file_path
-            .extension()
-            .map(|extension| extension == "rs")
-            .unwrap_or(false)
-        {
-            return Ok(());
-        }
-        let path_str = file_path.display().to_string().replace("\\", "/");
-        if should_not_remove_test(&path_str) {
-            return Ok(());
-        } else if should_remove_test(file_path)? {
-            return remove_file(&file_path);
-        }
-        Ok(())
+    if !prepare_files_callback(&rust_path)? {
+        // FIXME: create a function "display_if_not_quiet" or something along the line.
+        println!("Keeping all {} tests", test_type);
     }
 
-    remove_file(&rust_path.join("tests/ui/consts/const_cmp_type_id.rs"))?;
-    remove_file(&rust_path.join("tests/ui/consts/issue-73976-monomorphic.rs"))?;
-    // this test is oom-killed in the CI.
-    remove_file(&rust_path.join("tests/ui/consts/issue-miri-1910.rs"))?;
-    // Tests generating errors.
-    remove_file(&rust_path.join("tests/ui/consts/issue-94675.rs"))?;
-    remove_file(&rust_path.join("tests/ui/mir/mir_heavy_promoted.rs"))?;
-    remove_file(&rust_path.join("tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop-fail.rs"))?;
-    remove_file(&rust_path.join("tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop.rs"))?;
+    if test_type == "ui" {
+        if run_error_pattern_test {
+            // After we removed the error tests that are known to panic with rustc_codegen_gcc, we now remove the passing tests since this runs the error tests.
+            walk_dir(
+                rust_path.join("tests/ui"),
+                &mut |_dir| Ok(()),
+                &mut |file_path| {
+                    if contains_ui_error_patterns(file_path)? {
+                        Ok(())
+                    } else {
+                        remove_file(file_path).map_err(|e| e.to_string())
+                    }
+                },
+                true,
+            )?;
+        } else {
+            walk_dir(
+                rust_path.join("tests/ui"),
+                &mut |dir| {
+                    let dir_name = dir.file_name().and_then(|name| name.to_str()).unwrap_or("");
+                    if [
+                        "abi",
+                        "extern",
+                        "unsized-locals",
+                        "proc-macro",
+                        "threads-sendsync",
+                        "borrowck",
+                        "test-attrs",
+                    ]
+                    .iter()
+                    .any(|name| *name == dir_name)
+                    {
+                        std::fs::remove_dir_all(dir).map_err(|error| {
+                            format!("Failed to remove folder `{}`: {:?}", dir.display(), error)
+                        })?;
+                    }
+                    Ok(())
+                },
+                &mut |_| Ok(()),
+                false,
+            )?;
 
-    walk_dir(rust_path.join("tests/ui"), dir_handling, file_handling)?;
+            // These two functions are used to remove files that are known to not be working currently
+            // with the GCC backend to reduce noise.
+            fn dir_handling(dir: &Path) -> Result<(), String> {
+                if dir.file_name().map(|name| name == "auxiliary").unwrap_or(true) {
+                    return Ok(());
+                }
 
-    if !prepare_files_callback(&rust_path)? {
-        // FIXME: create a function "display_if_not_quiet" or something along the line.
-        println!("Keeping all UI tests");
-    }
+                walk_dir(dir, &mut dir_handling, &mut file_handling, false)
+            }
+            fn file_handling(file_path: &Path) -> Result<(), String> {
+                if !file_path.extension().map(|extension| extension == "rs").unwrap_or(false) {
+                    return Ok(());
+                }
+                let path_str = file_path.display().to_string().replace("\\", "/");
+                if valid_ui_error_pattern_test(&path_str) {
+                    return Ok(());
+                } else if contains_ui_error_patterns(file_path)? {
+                    return remove_file(&file_path);
+                }
+                Ok(())
+            }
 
-    let nb_parts = args.nb_parts.unwrap_or(0);
-    if nb_parts > 0 {
-        let current_part = args.current_part.unwrap();
-        // FIXME: create a function "display_if_not_quiet" or something along the line.
-        println!(
-            "Splitting ui_test into {} parts (and running part {})",
-            nb_parts, current_part
-        );
-        let out = String::from_utf8(
-            run_command(
-                &[
-                    &"find",
-                    &"tests/ui",
-                    &"-type",
-                    &"f",
-                    &"-name",
-                    &"*.rs",
-                    &"-not",
-                    &"-path",
-                    &"*/auxiliary/*",
-                ],
-                Some(&rust_path),
-            )?
-            .stdout,
-        )
-        .map_err(|error| format!("Failed to retrieve output of find command: {:?}", error))?;
-        let mut files = out
-            .split('\n')
-            .map(|line| line.trim())
-            .filter(|line| !line.is_empty())
-            .collect::<Vec<_>>();
-        // To ensure it'll be always the same sub files, we sort the content.
-        files.sort();
-        // We increment the number of tests by one because if this is an odd number, we would skip
-        // one test.
-        let count = files.len() / nb_parts + 1;
-        let start = current_part * count;
-        // We remove the files we don't want to test.
-        for path in files.iter().skip(start).take(count) {
-            remove_file(&rust_path.join(path))?;
+            walk_dir(rust_path.join("tests/ui"), &mut dir_handling, &mut file_handling, false)?;
+        }
+        let nb_parts = args.nb_parts.unwrap_or(0);
+        if nb_parts > 0 {
+            let current_part = args.current_part.unwrap();
+            // FIXME: create a function "display_if_not_quiet" or something along the line.
+            println!(
+                "Splitting ui_test into {} parts (and running part {})",
+                nb_parts, current_part
+            );
+            let out = String::from_utf8(
+                run_command(
+                    &[
+                        &"find",
+                        &"tests/ui",
+                        &"-type",
+                        &"f",
+                        &"-name",
+                        &"*.rs",
+                        &"-not",
+                        &"-path",
+                        &"*/auxiliary/*",
+                    ],
+                    Some(&rust_path),
+                )?
+                .stdout,
+            )
+            .map_err(|error| format!("Failed to retrieve output of find command: {:?}", error))?;
+            let mut files = out
+                .split('\n')
+                .map(|line| line.trim())
+                .filter(|line| !line.is_empty())
+                .collect::<Vec<_>>();
+            // To ensure it'll be always the same sub files, we sort the content.
+            files.sort();
+            // We increment the number of tests by one because if this is an odd number, we would skip
+            // one test.
+            let count = files.len() / nb_parts + 1;
+            // We remove the files we don't want to test.
+            let start = current_part * count;
+            for path in files.iter().skip(start).take(count) {
+                remove_file(&rust_path.join(path))?;
+            }
         }
     }
 
     // FIXME: create a function "display_if_not_quiet" or something along the line.
-    println!("[TEST] rustc test suite");
+    println!("[TEST] rustc {} test suite", test_type);
     env.insert("COMPILETEST_FORCE_STAGE0".to_string(), "1".to_string());
 
-    let extra = if args.is_using_gcc_master_branch() {
-        ""
-    } else {
-        " -Csymbol-mangling-version=v0"
-    };
+    let extra =
+        if args.is_using_gcc_master_branch() { "" } else { " -Csymbol-mangling-version=v0" };
 
     let rustc_args = format!(
-        "{} -Zcodegen-backend={} --sysroot {}{}",
-        env.get("TEST_FLAGS").unwrap_or(&String::new()),
-        args.config_info.cg_backend_path,
-        args.config_info.sysroot_path,
-        extra,
+        "{test_flags} -Zcodegen-backend={backend} --sysroot {sysroot}{extra}",
+        test_flags = env.get("TEST_FLAGS").unwrap_or(&String::new()),
+        backend = args.config_info.cg_backend_path,
+        sysroot = args.config_info.sysroot_path,
+        extra = extra,
     );
 
     env.get_mut("RUSTFLAGS").unwrap().clear();
+
     run_command_with_output_and_env(
         &[
             &"./x.py",
@@ -1085,7 +1027,7 @@ where
             &"always",
             &"--stage",
             &"0",
-            &"tests/ui",
+            &format!("tests/{}", test_type),
             &"--rustc-args",
             &rustc_args,
         ],
@@ -1096,68 +1038,162 @@ where
 }
 
 fn test_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
-    test_rustc_inner(env, args, |_| Ok(false))
+    //test_rustc_inner(env, args, |_| Ok(false), false, "run-make")?;
+    test_rustc_inner(env, args, |_| Ok(false), false, "ui")
 }
 
 fn test_failing_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
-    test_rustc_inner(env, args, |rust_path| {
-        // Removing all tests.
-        run_command(
-            &[
-                &"find",
-                &"tests/ui",
-                &"-type",
-                &"f",
-                &"-name",
-                &"*.rs",
-                &"-not",
-                &"-path",
-                &"*/auxiliary/*",
-                &"-delete",
-            ],
-            Some(rust_path),
-        )?;
+    let result1 = Ok(());
+    /*test_rustc_inner(
+        env,
+        args,
+        retain_files_callback("tests/failing-run-make-tests.txt", "run-make"),
+        false,
+        "run-make",
+    )*/
+
+    let result2 = test_rustc_inner(
+        env,
+        args,
+        retain_files_callback("tests/failing-ui-tests.txt", "ui"),
+        false,
+        "ui",
+    );
+
+    result1.and(result2)
+}
+
+fn test_successful_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
+    test_rustc_inner(
+        env,
+        args,
+        remove_files_callback("tests/failing-ui-tests.txt", "ui"),
+        false,
+        "ui",
+    )?;
+    Ok(())
+    /*test_rustc_inner(
+        env,
+        args,
+        remove_files_callback("tests/failing-run-make-tests.txt", "run-make"),
+        false,
+        "run-make",
+    )*/
+}
+
+fn test_failing_ui_pattern_tests(env: &Env, args: &TestArg) -> Result<(), String> {
+    test_rustc_inner(
+        env,
+        args,
+        remove_files_callback("tests/failing-ice-tests.txt", "ui"),
+        true,
+        "ui",
+    )
+}
+
+fn retain_files_callback<'a>(
+    file_path: &'a str,
+    test_type: &'a str,
+) -> impl Fn(&Path) -> Result<bool, String> + 'a {
+    move |rust_path| {
+        let files = std::fs::read_to_string(file_path).unwrap_or_default();
+        let first_file_name = files.lines().next().unwrap_or("");
+        // If the first line ends with a `/`, we treat all lines in the file as a directory.
+        if first_file_name.ends_with('/') {
+            // Treat as directory
+            // Removing all tests.
+            run_command(
+                &[
+                    &"find",
+                    &format!("tests/{}", test_type),
+                    &"-mindepth",
+                    &"1",
+                    &"-type",
+                    &"d",
+                    &"-exec",
+                    &"rm",
+                    &"-rf",
+                    &"{}",
+                    &"+",
+                ],
+                Some(rust_path),
+            )?;
+        } else {
+            // Treat as file
+            // Removing all tests.
+            run_command(
+                &[
+                    &"find",
+                    &format!("tests/{}", test_type),
+                    &"-type",
+                    &"f",
+                    &"-name",
+                    &"*.rs",
+                    &"-not",
+                    &"-path",
+                    &"*/auxiliary/*",
+                    &"-delete",
+                ],
+                Some(rust_path),
+            )?;
+        }
+
         // Putting back only the failing ones.
-        let path = "tests/failing-ui-tests.txt";
-        if let Ok(files) = std::fs::read_to_string(path) {
-            for file in files
-                .split('\n')
-                .map(|line| line.trim())
-                .filter(|line| !line.is_empty())
-            {
+        if let Ok(files) = std::fs::read_to_string(&file_path) {
+            for file in files.split('\n').map(|line| line.trim()).filter(|line| !line.is_empty()) {
                 run_command(&[&"git", &"checkout", &"--", &file], Some(&rust_path))?;
             }
         } else {
             println!(
-                "Failed to read `{}`, not putting back failing ui tests",
-                path
+                "Failed to read `{}`, not putting back failing {} tests",
+                file_path, test_type
             );
         }
+
         Ok(true)
-    })
+    }
 }
 
-fn test_successful_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
-    test_rustc_inner(env, args, |rust_path| {
-        // Removing the failing tests.
-        let path = "tests/failing-ui-tests.txt";
-        if let Ok(files) = std::fs::read_to_string(path) {
-            for file in files
-                .split('\n')
-                .map(|line| line.trim())
-                .filter(|line| !line.is_empty())
-            {
-                let path = rust_path.join(file);
-                remove_file(&path)?;
+fn remove_files_callback<'a>(
+    file_path: &'a str,
+    test_type: &'a str,
+) -> impl Fn(&Path) -> Result<bool, String> + 'a {
+    move |rust_path| {
+        let files = std::fs::read_to_string(file_path).unwrap_or_default();
+        let first_file_name = files.lines().next().unwrap_or("");
+        // If the first line ends with a `/`, we treat all lines in the file as a directory.
+        if first_file_name.ends_with('/') {
+            // Removing the failing tests.
+            if let Ok(files) = std::fs::read_to_string(file_path) {
+                for file in
+                    files.split('\n').map(|line| line.trim()).filter(|line| !line.is_empty())
+                {
+                    let path = rust_path.join(file);
+                    if let Err(e) = std::fs::remove_dir_all(&path) {
+                        println!("Failed to remove directory `{}`: {}", path.display(), e);
+                    }
+                }
+            } else {
+                println!(
+                    "Failed to read `{}`, not putting back failing {} tests",
+                    file_path, test_type
+                );
             }
         } else {
-            println!(
-                "Failed to read `{}`, not putting back failing ui tests",
-                path
-            );
+            // Removing the failing tests.
+            if let Ok(files) = std::fs::read_to_string(file_path) {
+                for file in
+                    files.split('\n').map(|line| line.trim()).filter(|line| !line.is_empty())
+                {
+                    let path = rust_path.join(file);
+                    remove_file(&path)?;
+                }
+            } else {
+                println!("Failed to read `{}`, not putting back failing ui tests", file_path);
+            }
         }
         Ok(true)
-    })
+    }
 }
 
 fn run_all(env: &Env, args: &TestArg) -> Result<(), String> {
@@ -1181,14 +1217,8 @@ pub fn run() -> Result<(), String> {
 
     if !args.use_system_gcc {
         args.config_info.setup_gcc_path()?;
-        env.insert(
-            "LIBRARY_PATH".to_string(),
-            args.config_info.gcc_path.clone(),
-        );
-        env.insert(
-            "LD_LIBRARY_PATH".to_string(),
-            args.config_info.gcc_path.clone(),
-        );
+        env.insert("LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
+        env.insert("LD_LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
     }
 
     build_if_no_backend(&env, &args)?;
diff --git a/compiler/rustc_codegen_gcc/build_system/src/utils.rs b/compiler/rustc_codegen_gcc/build_system/src/utils.rs
index d9c13fd143d15..3bba8df6c6504 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/utils.rs
+++ b/compiler/rustc_codegen_gcc/build_system/src/utils.rs
@@ -1,10 +1,42 @@
 use std::collections::HashMap;
+#[cfg(unix)]
+use std::ffi::c_int;
 use std::ffi::OsStr;
 use std::fmt::Debug;
 use std::fs;
+#[cfg(unix)]
+use std::os::unix::process::ExitStatusExt;
 use std::path::{Path, PathBuf};
 use std::process::{Command, ExitStatus, Output};
 
+#[cfg(unix)]
+extern "C" {
+    fn raise(signal: c_int) -> c_int;
+}
+
+fn exec_command(
+    input: &[&dyn AsRef<OsStr>],
+    cwd: Option<&Path>,
+    env: Option<&HashMap<String, String>>,
+) -> Result<ExitStatus, String> {
+    let status = get_command_inner(input, cwd, env)
+        .spawn()
+        .map_err(|e| command_error(input, &cwd, e))?
+        .wait()
+        .map_err(|e| command_error(input, &cwd, e))?;
+    #[cfg(unix)]
+    {
+        if let Some(signal) = status.signal() {
+            unsafe {
+                raise(signal as _);
+            }
+            // In case the signal didn't kill the current process.
+            return Err(command_error(input, &cwd, format!("Process received signal {}", signal)));
+        }
+    }
+    Ok(status)
+}
+
 fn get_command_inner(
     input: &[&dyn AsRef<OsStr>],
     cwd: Option<&Path>,
@@ -37,13 +69,8 @@ fn check_exit_status(
     }
     let mut error = format!(
         "Command `{}`{} exited with status {:?}",
-        input
-            .iter()
-            .map(|s| s.as_ref().to_str().unwrap())
-            .collect::<Vec<_>>()
-            .join(" "),
-        cwd.map(|cwd| format!(" (running in folder `{}`)", cwd.display()))
-            .unwrap_or_default(),
+        input.iter().map(|s| s.as_ref().to_str().unwrap()).collect::<Vec<_>>().join(" "),
+        cwd.map(|cwd| format!(" (running in folder `{}`)", cwd.display())).unwrap_or_default(),
         exit_status.code()
     );
     let input = input.iter().map(|i| i.as_ref()).collect::<Vec<&OsStr>>();
@@ -68,11 +95,7 @@ fn check_exit_status(
 fn command_error<D: Debug>(input: &[&dyn AsRef<OsStr>], cwd: &Option<&Path>, error: D) -> String {
     format!(
         "Command `{}`{} failed to run: {error:?}",
-        input
-            .iter()
-            .map(|s| s.as_ref().to_str().unwrap())
-            .collect::<Vec<_>>()
-            .join(" "),
+        input.iter().map(|s| s.as_ref().to_str().unwrap()).collect::<Vec<_>>().join(" "),
         cwd.as_ref()
             .map(|cwd| format!(" (running in folder `{}`)", cwd.display(),))
             .unwrap_or_default(),
@@ -88,9 +111,8 @@ pub fn run_command_with_env(
     cwd: Option<&Path>,
     env: Option<&HashMap<String, String>>,
 ) -> Result<Output, String> {
-    let output = get_command_inner(input, cwd, env)
-        .output()
-        .map_err(|e| command_error(input, &cwd, e))?;
+    let output =
+        get_command_inner(input, cwd, env).output().map_err(|e| command_error(input, &cwd, e))?;
     check_exit_status(input, cwd, output.status, Some(&output), true)?;
     Ok(output)
 }
@@ -99,11 +121,7 @@ pub fn run_command_with_output(
     input: &[&dyn AsRef<OsStr>],
     cwd: Option<&Path>,
 ) -> Result<(), String> {
-    let exit_status = get_command_inner(input, cwd, None)
-        .spawn()
-        .map_err(|e| command_error(input, &cwd, e))?
-        .wait()
-        .map_err(|e| command_error(input, &cwd, e))?;
+    let exit_status = exec_command(input, cwd, None)?;
     check_exit_status(input, cwd, exit_status, None, true)?;
     Ok(())
 }
@@ -113,11 +131,7 @@ pub fn run_command_with_output_and_env(
     cwd: Option<&Path>,
     env: Option<&HashMap<String, String>>,
 ) -> Result<(), String> {
-    let exit_status = get_command_inner(input, cwd, env)
-        .spawn()
-        .map_err(|e| command_error(input, &cwd, e))?
-        .wait()
-        .map_err(|e| command_error(input, &cwd, e))?;
+    let exit_status = exec_command(input, cwd, env)?;
     check_exit_status(input, cwd, exit_status, None, true)?;
     Ok(())
 }
@@ -127,11 +141,7 @@ pub fn run_command_with_output_and_env_no_err(
     cwd: Option<&Path>,
     env: Option<&HashMap<String, String>>,
 ) -> Result<(), String> {
-    let exit_status = get_command_inner(input, cwd, env)
-        .spawn()
-        .map_err(|e| command_error(input, &cwd, e))?
-        .wait()
-        .map_err(|e| command_error(input, &cwd, e))?;
+    let exit_status = exec_command(input, cwd, env)?;
     check_exit_status(input, cwd, exit_status, None, false)?;
     Ok(())
 }
@@ -164,10 +174,7 @@ pub fn cargo_install(to_install: &str) -> Result<(), String> {
 
 pub fn get_os_name() -> Result<String, String> {
     let output = run_command(&[&"uname"], None)?;
-    let name = std::str::from_utf8(&output.stdout)
-        .unwrap_or("")
-        .trim()
-        .to_string();
+    let name = std::str::from_utf8(&output.stdout).unwrap_or("").trim().to_string();
     if !name.is_empty() {
         Ok(name)
     } else {
@@ -274,11 +281,7 @@ fn git_clone_inner(
         command.push(&"1");
     }
     run_command_with_output(&command, None)?;
-    Ok(CloneResult {
-        ran_clone: true,
-        repo_name,
-        repo_dir: dest.display().to_string(),
-    })
+    Ok(CloneResult { ran_clone: true, repo_name, repo_dir: dest.display().to_string() })
 }
 
 fn get_repo_name(url: &str) -> String {
@@ -307,6 +310,25 @@ pub fn git_clone(
     git_clone_inner(to_clone, dest, shallow_clone, repo_name)
 }
 
+pub fn create_dir<P: AsRef<Path>>(path: P) -> Result<(), String> {
+    fs::create_dir_all(&path).map_err(|error| {
+        format!("Failed to create directory `{}`: {:?}", path.as_ref().display(), error)
+    })
+}
+
+pub fn copy_file<F: AsRef<Path>, T: AsRef<Path>>(from: F, to: T) -> Result<(), String> {
+    fs::copy(&from, &to)
+        .map_err(|error| {
+            format!(
+                "Failed to copy file `{}` into `{}`: {:?}",
+                from.as_ref().display(),
+                to.as_ref().display(),
+                error
+            )
+        })
+        .map(|_| ())
+}
+
 /// This function differs from `git_clone` in how it handles *where* the repository will be cloned.
 /// In `git_clone`, it is cloned in the provided path. In this function, the path you provide is
 /// the parent folder. So if you pass "a" as folder and try to clone "b.git", it will be cloned into
@@ -318,15 +340,15 @@ pub fn git_clone_root_dir(
 ) -> Result<CloneResult, String> {
     let repo_name = get_repo_name(to_clone);
 
-    git_clone_inner(
-        to_clone,
-        &dest_parent_dir.join(&repo_name),
-        shallow_clone,
-        repo_name,
-    )
+    git_clone_inner(to_clone, &dest_parent_dir.join(&repo_name), shallow_clone, repo_name)
 }
 
-pub fn walk_dir<P, D, F>(dir: P, mut dir_cb: D, mut file_cb: F) -> Result<(), String>
+pub fn walk_dir<P, D, F>(
+    dir: P,
+    dir_cb: &mut D,
+    file_cb: &mut F,
+    recursive: bool,
+) -> Result<(), String>
 where
     P: AsRef<Path>,
     D: FnMut(&Path) -> Result<(), String>,
@@ -341,6 +363,9 @@ where
         let entry_path = entry.path();
         if entry_path.is_dir() {
             dir_cb(&entry_path)?;
+            if recursive {
+                walk_dir(entry_path, dir_cb, file_cb, recursive)?; // Recursive call
+            }
         } else {
             file_cb(&entry_path)?;
         }
@@ -383,11 +408,7 @@ pub fn split_args(args: &str) -> Result<Vec<String>, String> {
                 }
             }
             if !found_end {
-                return Err(format!(
-                    "Didn't find `{}` at the end of `{}`",
-                    end,
-                    &args[start..]
-                ));
+                return Err(format!("Didn't find `{}` at the end of `{}`", end, &args[start..]));
             }
         } else if c == '\\' {
             // We skip the escaped character.
@@ -403,11 +424,7 @@ pub fn split_args(args: &str) -> Result<Vec<String>, String> {
 
 pub fn remove_file<P: AsRef<Path> + ?Sized>(file_path: &P) -> Result<(), String> {
     std::fs::remove_file(file_path).map_err(|error| {
-        format!(
-            "Failed to remove `{}`: {:?}",
-            file_path.as_ref().display(),
-            error
-        )
+        format!("Failed to remove `{}`: {:?}", file_path.as_ref().display(), error)
     })
 }
 
@@ -427,6 +444,10 @@ pub fn create_symlink<P: AsRef<Path>, Q: AsRef<Path>>(original: P, link: Q) -> R
     })
 }
 
+pub fn get_sysroot_dir() -> PathBuf {
+    Path::new(crate::BUILD_DIR).join("build_sysroot")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/compiler/rustc_codegen_gcc/config.example.toml b/compiler/rustc_codegen_gcc/config.example.toml
index dcc414b731001..890387dc24266 100644
--- a/compiler/rustc_codegen_gcc/config.example.toml
+++ b/compiler/rustc_codegen_gcc/config.example.toml
@@ -1,2 +1,2 @@
-gcc-path = "gcc-build/gcc"
-# download-gccjit = true
+#gcc-path = "gcc-build/gcc"
+download-gccjit = true
diff --git a/compiler/rustc_codegen_gcc/deps/libLLVM-18-rust-1.78.0-nightly.so b/compiler/rustc_codegen_gcc/deps/libLLVM-18-rust-1.78.0-nightly.so
deleted file mode 100644
index c44ca790b4f8c..0000000000000
--- a/compiler/rustc_codegen_gcc/deps/libLLVM-18-rust-1.78.0-nightly.so
+++ /dev/null
@@ -1 +0,0 @@
-INPUT(libLLVM.so.18.1-rust-1.78.0-nightly)
diff --git a/compiler/rustc_codegen_gcc/doc/tips.md b/compiler/rustc_codegen_gcc/doc/tips.md
index 1379f5130be02..86c22db186e01 100644
--- a/compiler/rustc_codegen_gcc/doc/tips.md
+++ b/compiler/rustc_codegen_gcc/doc/tips.md
@@ -35,6 +35,14 @@ COLLECT_NO_DEMANGLE=1
  * Build the stage2 compiler (`rustup toolchain link debug-current build/x86_64-unknown-linux-gnu/stage2`).
  * Clean and rebuild the codegen with `debug-current` in the file `rust-toolchain`.
 
+### How to use a custom sysroot source path
+
+If you wish to build a custom sysroot, pass the path of your sysroot source to `--sysroot-source` during the `prepare` step, like so:
+
+```
+./y.sh prepare --sysroot-source /path/to/custom/source
+```
+
 ### How to use [mem-trace](https://github.com/antoyo/mem-trace)
 
 `rustc` needs to be built without `jemalloc` so that `mem-trace` can overload `malloc` since `jemalloc` is linked statically, so a `LD_PRELOAD`-ed library won't a chance to intercept the calls to `malloc`.
@@ -54,13 +62,13 @@ generate it in [gimple.md](./doc/gimple.md).
 
  * Run `./y.sh prepare --cross` so that the sysroot is patched for the cross-compiling case.
  * Set the path to the cross-compiling libgccjit in `gcc-path` (in `config.toml`).
- * Make sure you have the linker for your target (for instance `m68k-unknown-linux-gnu-gcc`) in your `$PATH`. Currently, the linker name is hardcoded as being `$TARGET-gcc`. Specify the target when building the sysroot: `./y.sh build --target-triple m68k-unknown-linux-gnu`.
+ * Make sure you have the linker for your target (for instance `m68k-unknown-linux-gnu-gcc`) in your `$PATH`. Currently, the linker name is hardcoded as being `$TARGET-gcc`. Specify the target when building the sysroot: `./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu`.
  * Build your project by specifying the target: `OVERWRITE_TARGET_TRIPLE=m68k-unknown-linux-gnu ../y.sh cargo build --target m68k-unknown-linux-gnu`.
 
 If the target is not yet supported by the Rust compiler, create a [target specification file](https://docs.rust-embedded.org/embedonomicon/custom-target.html) (note that the `arch` specified in this file must be supported by the rust compiler).
 Then, you can use it the following way:
 
- * Add the target specification file using `--target` as an **absolute** path to build the sysroot: `./y.sh build --target-triple m68k-unknown-linux-gnu --target $(pwd)/m68k-unknown-linux-gnu.json`
+ * Add the target specification file using `--target` as an **absolute** path to build the sysroot: `./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu --target $(pwd)/m68k-unknown-linux-gnu.json`
  * Build your project by specifying the target specification file: `OVERWRITE_TARGET_TRIPLE=m68k-unknown-linux-gnu ../y.sh cargo build --target path/to/m68k-unknown-linux-gnu.json`.
 
 If you get the following error:
diff --git a/compiler/rustc_codegen_gcc/example/example.rs b/compiler/rustc_codegen_gcc/example/example.rs
index 7c21b73b630e8..03470b74d0a13 100644
--- a/compiler/rustc_codegen_gcc/example/example.rs
+++ b/compiler/rustc_codegen_gcc/example/example.rs
@@ -153,10 +153,9 @@ fn array_as_slice(arr: &[u8; 3]) -> &[u8] {
     arr
 }
 
-// FIXME: fix the intrinsic implementation to work with the new ->u32 signature
-// unsafe fn use_ctlz_nonzero(a: u16) -> u32 {
-//     intrinsics::ctlz_nonzero(a)
-// }
+unsafe fn use_ctlz_nonzero(a: u16) -> u32 {
+    intrinsics::ctlz_nonzero(a)
+}
 
 fn ptr_as_usize(ptr: *const u8) -> usize {
     ptr as usize
diff --git a/compiler/rustc_codegen_gcc/libgccjit.version b/compiler/rustc_codegen_gcc/libgccjit.version
index 41bec6df5d95c..23ca7f022155e 100644
--- a/compiler/rustc_codegen_gcc/libgccjit.version
+++ b/compiler/rustc_codegen_gcc/libgccjit.version
@@ -1 +1 @@
-b6f163f52
+341be3b7d7ac6976cfed8ed59da3573c040d0776
diff --git a/compiler/rustc_codegen_gcc/patches/0001-Add-stdarch-Cargo.toml-for-testing.patch b/compiler/rustc_codegen_gcc/patches/0001-Add-stdarch-Cargo.toml-for-testing.patch
index 2a55f2cb796f9..9cc377850b9b7 100644
--- a/compiler/rustc_codegen_gcc/patches/0001-Add-stdarch-Cargo.toml-for-testing.patch
+++ b/compiler/rustc_codegen_gcc/patches/0001-Add-stdarch-Cargo.toml-for-testing.patch
@@ -19,7 +19,7 @@ index 0000000..4c63700
 +members = [
 +  "crates/core_arch",
 +  "crates/std_detect",
-+  "crates/stdarch-gen",
++  "crates/stdarch-gen-arm",
 +  #"examples/"
 +]
 +exclude = [
diff --git a/compiler/rustc_codegen_gcc/patches/0022-core-Disable-not-compiling-tests.patch b/compiler/rustc_codegen_gcc/patches/0022-core-Disable-not-compiling-tests.patch
index a7d523f940826..ea1a5a8d35535 100644
--- a/compiler/rustc_codegen_gcc/patches/0022-core-Disable-not-compiling-tests.patch
+++ b/compiler/rustc_codegen_gcc/patches/0022-core-Disable-not-compiling-tests.patch
@@ -39,4 +39,4 @@ index 42a26ae..5ac1042 100644
 +#![cfg(test)]
  #![feature(alloc_layout_extra)]
  #![feature(array_chunks)]
- #![feature(array_windows)]
+ #![feature(array_ptr_get)]
diff --git a/compiler/rustc_codegen_gcc/patches/libgccjit12/0001-core-Disable-portable-simd-test.patch b/compiler/rustc_codegen_gcc/patches/libgccjit12/0001-core-Disable-portable-simd-test.patch
index 36d0789d2a23b..42ae534e464d5 100644
--- a/compiler/rustc_codegen_gcc/patches/libgccjit12/0001-core-Disable-portable-simd-test.patch
+++ b/compiler/rustc_codegen_gcc/patches/libgccjit12/0001-core-Disable-portable-simd-test.patch
@@ -1,4 +1,4 @@
-From a5663265f797a43c502915c356fe7899c16cee92 Mon Sep 17 00:00:00 2001
+From 124a11ce086952a5794d5cfbaa45175809497b81 Mon Sep 17 00:00:00 2001
 From: None <none@example.com>
 Date: Sat, 18 Nov 2023 10:50:36 -0500
 Subject: [PATCH] [core] Disable portable-simd test
@@ -8,18 +8,18 @@ Subject: [PATCH] [core] Disable portable-simd test
  1 file changed, 2 deletions(-)
 
 diff --git a/library/core/tests/lib.rs b/library/core/tests/lib.rs
-index d0a119c..76fdece 100644
+index b71786c..cf484d5 100644
 --- a/library/core/tests/lib.rs
 +++ b/library/core/tests/lib.rs
-@@ -89,7 +89,6 @@
+@@ -95,7 +95,6 @@
  #![feature(never_type)]
  #![feature(unwrap_infallible)]
  #![feature(pointer_is_aligned_to)]
 -#![feature(portable_simd)]
  #![feature(ptr_metadata)]
- #![feature(lazy_cell)]
  #![feature(unsized_tuple_coercion)]
-@@ -155,7 +154,6 @@ mod pin;
+ #![feature(const_option)]
+@@ -157,7 +156,6 @@ mod pin;
  mod pin_macro;
  mod ptr;
  mod result;
@@ -27,6 +27,5 @@ index d0a119c..76fdece 100644
  mod slice;
  mod str;
  mod str_lossy;
---
-2.42.1
-
+-- 
+2.45.2
diff --git a/compiler/rustc_codegen_gcc/rust-toolchain b/compiler/rustc_codegen_gcc/rust-toolchain
index a0ac82866609e..3c83f4b4608de 100644
--- a/compiler/rustc_codegen_gcc/rust-toolchain
+++ b/compiler/rustc_codegen_gcc/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-03-05"
+channel = "nightly-2024-07-02"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]
diff --git a/compiler/rustc_codegen_gcc/src/abi.rs b/compiler/rustc_codegen_gcc/src/abi.rs
index b098594dbcc35..166dd080cf209 100644
--- a/compiler/rustc_codegen_gcc/src/abi.rs
+++ b/compiler/rustc_codegen_gcc/src/abi.rs
@@ -4,6 +4,7 @@ use gccjit::{ToLValue, ToRValue, Type};
 use rustc_codegen_ssa::traits::{AbiBuilderMethods, BaseTypeMethods};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::bug;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::Ty;
 #[cfg(feature = "master")]
 use rustc_session::config;
@@ -184,9 +185,17 @@ impl<'gcc, 'tcx> FnAbiGccExt<'gcc, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
                 }
                 PassMode::Indirect { attrs, meta_attrs: Some(meta_attrs), on_stack } => {
                     assert!(!on_stack);
-                    let ty =
-                        apply_attrs(cx.type_ptr_to(arg.memory_ty(cx)), &attrs, argument_tys.len());
-                    apply_attrs(ty, &meta_attrs, argument_tys.len())
+                    // Construct the type of a (wide) pointer to `ty`, and pass its two fields.
+                    // Any two ABI-compatible unsized types have the same metadata type and
+                    // moreover the same metadata value leads to the same dynamic size and
+                    // alignment, so this respects ABI compatibility.
+                    let ptr_ty = Ty::new_mut_ptr(cx.tcx, arg.layout.ty);
+                    let ptr_layout = cx.layout_of(ptr_ty);
+                    let typ1 = ptr_layout.scalar_pair_element_gcc_type(cx, 0);
+                    let typ2 = ptr_layout.scalar_pair_element_gcc_type(cx, 1);
+                    argument_tys.push(apply_attrs(typ1, &attrs, argument_tys.len()));
+                    argument_tys.push(apply_attrs(typ2, &meta_attrs, argument_tys.len()));
+                    continue;
                 }
             };
             argument_tys.push(arg_ty);
diff --git a/compiler/rustc_codegen_gcc/src/asm.rs b/compiler/rustc_codegen_gcc/src/asm.rs
index 06b14a1f118a3..aa485846cd429 100644
--- a/compiler/rustc_codegen_gcc/src/asm.rs
+++ b/compiler/rustc_codegen_gcc/src/asm.rs
@@ -115,7 +115,7 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         span: &[Span],
         instance: Instance<'_>,
         dest: Option<Self::BasicBlock>,
-        _catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>,
+        _dest_catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>,
     ) {
         if options.contains(InlineAsmOptions::MAY_UNWIND) {
             self.sess().dcx().create_err(UnwindingInlineAsm { span: span[0] }).emit();
@@ -485,9 +485,8 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
                         }
 
                         InlineAsmOperandRef::Label { label } => {
-                            let label_gcc_index = labels.iter()
-                                .position(|&l| l == label)
-                                .expect("wrong rust index");
+                            let label_gcc_index =
+                                labels.iter().position(|&l| l == label).expect("wrong rust index");
                             let gcc_index = label_gcc_index + outputs.len() + inputs.len();
                             push_to_template(Some('l'), gcc_index);
                         }
@@ -538,9 +537,8 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         }
         if dest.is_none() && options.contains(InlineAsmOptions::NORETURN) {
             let builtin_unreachable = self.context.get_builtin_function("__builtin_unreachable");
-            let builtin_unreachable: RValue<'gcc> = unsafe {
-                std::mem::transmute(builtin_unreachable)
-            };
+            let builtin_unreachable: RValue<'gcc> =
+                unsafe { std::mem::transmute(builtin_unreachable) };
             self.call(self.type_void(), None, None, builtin_unreachable, &[], None, None);
         }
 
@@ -696,10 +694,12 @@ fn reg_to_gcc(reg: InlineAsmRegOrRegClass) -> ConstraintOrRegister {
 fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegClass) -> Type<'gcc> {
     match reg {
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::reg) => cx.type_i32(),
-        InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::preg) => unimplemented!(),
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg)
         | InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg_low16) => {
-            unimplemented!()
+            cx.type_vector(cx.type_i64(), 2)
+        }
+        InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::preg) => {
+            unreachable!("clobber-only")
         }
         InlineAsmRegClass::Arm(ArmInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::Arm(ArmInlineAsmRegClass::sreg)
@@ -710,21 +710,13 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         InlineAsmRegClass::Arm(ArmInlineAsmRegClass::qreg)
         | InlineAsmRegClass::Arm(ArmInlineAsmRegClass::qreg_low8)
         | InlineAsmRegClass::Arm(ArmInlineAsmRegClass::qreg_low4) => {
-            unimplemented!()
+            cx.type_vector(cx.type_i64(), 2)
         }
-        InlineAsmRegClass::Avr(_) => unimplemented!(),
-        InlineAsmRegClass::Bpf(_) => unimplemented!(),
         InlineAsmRegClass::Hexagon(HexagonInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::LoongArch(LoongArchInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::LoongArch(LoongArchInlineAsmRegClass::freg) => cx.type_f32(),
-        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg) => cx.type_i32(),
-        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_addr) => cx.type_i32(),
-        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_data) => cx.type_i32(),
-        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::reg) => cx.type_i32(),
-        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::freg) => cx.type_f32(),
         InlineAsmRegClass::Mips(MipsInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::Mips(MipsInlineAsmRegClass::freg) => cx.type_f32(),
-        InlineAsmRegClass::Msp430(_) => unimplemented!(),
         InlineAsmRegClass::Nvptx(NvptxInlineAsmRegClass::reg16) => cx.type_i16(),
         InlineAsmRegClass::Nvptx(NvptxInlineAsmRegClass::reg32) => cx.type_i32(),
         InlineAsmRegClass::Nvptx(NvptxInlineAsmRegClass::reg64) => cx.type_i64(),
@@ -737,26 +729,43 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         }
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::freg) => cx.type_f32(),
-        InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::vreg) => cx.type_f32(),
+        InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::vreg) => {
+            unreachable!("clobber-only")
+        }
         InlineAsmRegClass::X86(X86InlineAsmRegClass::reg)
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::reg_abcd) => cx.type_i32(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::reg_byte) => cx.type_i8(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::mmx_reg) => unimplemented!(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::xmm_reg)
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::ymm_reg)
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => cx.type_f32(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg) => unimplemented!(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => cx.type_i16(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg0) => cx.type_i16(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::tmm_reg) => unimplemented!(),
-        InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => cx.type_i32(),
-        InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
-            bug!("LLVM backend does not support SPIR-V")
+        InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg)
+        | InlineAsmRegClass::X86(X86InlineAsmRegClass::mmx_reg)
+        | InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg0)
+        | InlineAsmRegClass::X86(X86InlineAsmRegClass::tmm_reg) => {
+            unreachable!("clobber-only")
         }
+        InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => cx.type_i32(),
+        InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::reg) => cx.type_i64(),
+        InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::wreg) => cx.type_i32(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg) => cx.type_i8(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_upper) => cx.type_i8(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_pair) => cx.type_i16(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_iw) => cx.type_i16(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_ptr) => cx.type_i16(),
         InlineAsmRegClass::S390x(
             S390xInlineAsmRegClass::reg | S390xInlineAsmRegClass::reg_addr,
         ) => cx.type_i32(),
         InlineAsmRegClass::S390x(S390xInlineAsmRegClass::freg) => cx.type_f64(),
+        InlineAsmRegClass::Msp430(Msp430InlineAsmRegClass::reg) => cx.type_i16(),
+        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg) => cx.type_i32(),
+        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_addr) => cx.type_i32(),
+        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_data) => cx.type_i32(),
+        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::reg) => cx.type_i32(),
+        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::freg) => cx.type_f32(),
+        InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
+            bug!("GCC backend does not support SPIR-V")
+        }
         InlineAsmRegClass::Err => unreachable!(),
     }
 }
diff --git a/compiler/rustc_codegen_gcc/src/attributes.rs b/compiler/rustc_codegen_gcc/src/attributes.rs
index 8602566ab8fa2..27f21107eda70 100644
--- a/compiler/rustc_codegen_gcc/src/attributes.rs
+++ b/compiler/rustc_codegen_gcc/src/attributes.rs
@@ -92,7 +92,7 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
     let mut function_features = function_features
         .iter()
         .flat_map(|feat| to_gcc_features(cx.tcx.sess, feat).into_iter())
-        .chain(codegen_fn_attrs.instruction_set.iter().map(|x| match x {
+        .chain(codegen_fn_attrs.instruction_set.iter().map(|x| match *x {
             InstructionSetAttr::ArmA32 => "-thumb-mode", // TODO(antoyo): support removing feature.
             InstructionSetAttr::ArmT32 => "thumb-mode",
         }))
@@ -118,8 +118,8 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
 
             if feature.starts_with('-') {
                 Some(format!("no{}", feature))
-            } else if feature.starts_with('+') {
-                Some(feature[1..].to_string())
+            } else if let Some(stripped) = feature.strip_prefix('+') {
+                Some(stripped.to_string())
             } else {
                 Some(feature.to_string())
             }
@@ -128,6 +128,12 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
         .join(",");
     if !target_features.is_empty() {
         #[cfg(feature = "master")]
-        func.add_attribute(FnAttribute::Target(&target_features));
+        match cx.sess().target.arch.as_ref() {
+            "x86" | "x86_64" | "powerpc" => {
+                func.add_attribute(FnAttribute::Target(&target_features))
+            }
+            // The target attribute is not supported on other targets in GCC.
+            _ => (),
+        }
     }
 }
diff --git a/compiler/rustc_codegen_gcc/src/back/lto.rs b/compiler/rustc_codegen_gcc/src/back/lto.rs
index ec70fbdddb0ff..6b2dbbbed6771 100644
--- a/compiler/rustc_codegen_gcc/src/back/lto.rs
+++ b/compiler/rustc_codegen_gcc/src/back/lto.rs
@@ -16,13 +16,14 @@
 // /usr/bin/ld: warning: type of symbol `_RNvNvNvNtCs5JWOrf9uCus_5rayon11thread_pool19WORKER_THREAD_STATE7___getit5___KEY' changed from 1 to 6 in /tmp/ccKeUSiR.ltrans0.ltrans.o
 // /usr/bin/ld: warning: type of symbol `_RNvNvNvNvNtNtNtCsAj5i4SGTR7_3std4sync4mpmc5waker17current_thread_id5DUMMY7___getit5___KEY' changed from 1 to 6 in /tmp/ccKeUSiR.ltrans0.ltrans.o
 // /usr/bin/ld: warning: incremental linking of LTO and non-LTO objects; using -flinker-output=nolto-rel which will bypass whole program optimization
-use std::ffi::CString;
+use std::ffi::{CStr, CString};
 use std::fs::{self, File};
 use std::path::{Path, PathBuf};
+use std::sync::Arc;
 
-use gccjit::OutputKind;
+use gccjit::{Context, OutputKind};
 use object::read::archive::ArchiveFile;
-use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule};
+use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule, ThinShared};
 use rustc_codegen_ssa::back::symbol_export;
 use rustc_codegen_ssa::back::write::{CodegenContext, FatLtoInput};
 use rustc_codegen_ssa::traits::*;
@@ -30,6 +31,7 @@ use rustc_codegen_ssa::{looks_like_rust_object_file, ModuleCodegen, ModuleKind};
 use rustc_data_structures::memmap::Mmap;
 use rustc_errors::{DiagCtxtHandle, FatalError};
 use rustc_hir::def_id::LOCAL_CRATE;
+use rustc_middle::bug;
 use rustc_middle::dep_graph::WorkProduct;
 use rustc_middle::middle::exported_symbols::{SymbolExportInfo, SymbolExportLevel};
 use rustc_session::config::{CrateType, Lto};
@@ -37,7 +39,7 @@ use tempfile::{tempdir, TempDir};
 
 use crate::back::write::save_temp_bitcode;
 use crate::errors::{DynamicLinkingWithLTO, LtoBitcodeFromRlib, LtoDisallowed, LtoDylib};
-use crate::{to_gcc_opt_level, GccCodegenBackend, GccContext};
+use crate::{to_gcc_opt_level, GccCodegenBackend, GccContext, SyncContext};
 
 /// We keep track of the computed LTO cache keys from the previous
 /// session to determine which CGUs we can reuse.
@@ -128,8 +130,7 @@ fn prepare_lto(
             }
 
             let archive_data = unsafe {
-                Mmap::map(File::open(&path).expect("couldn't open rlib"))
-                    .expect("couldn't map rlib")
+                Mmap::map(File::open(path).expect("couldn't open rlib")).expect("couldn't map rlib")
             };
             let archive = ArchiveFile::parse(&*archive_data).expect("wanted an rlib");
             let obj_files = archive
@@ -349,6 +350,395 @@ impl ModuleBuffer {
 
 impl ModuleBufferMethods for ModuleBuffer {
     fn data(&self) -> &[u8] {
-        unimplemented!("data not needed for GCC codegen");
+        &[]
     }
 }
+
+/// Performs thin LTO by performing necessary global analysis and returning two
+/// lists, one of the modules that need optimization and another for modules that
+/// can simply be copied over from the incr. comp. cache.
+pub(crate) fn run_thin(
+    cgcx: &CodegenContext<GccCodegenBackend>,
+    modules: Vec<(String, ThinBuffer)>,
+    cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>,
+) -> Result<(Vec<LtoModuleCodegen<GccCodegenBackend>>, Vec<WorkProduct>), FatalError> {
+    let dcx = cgcx.create_dcx();
+    let dcx = dcx.handle();
+    let lto_data = prepare_lto(cgcx, dcx)?;
+    /*let symbols_below_threshold =
+    symbols_below_threshold.iter().map(|c| c.as_ptr()).collect::<Vec<_>>();*/
+    if cgcx.opts.cg.linker_plugin_lto.enabled() {
+        unreachable!(
+            "We should never reach this case if the LTO step \
+                      is deferred to the linker"
+        );
+    }
+    thin_lto(
+        cgcx,
+        dcx,
+        modules,
+        lto_data.upstream_modules,
+        lto_data.tmp_path,
+        cached_modules, /*, &symbols_below_threshold*/
+    )
+}
+
+pub(crate) fn prepare_thin(
+    module: ModuleCodegen<GccContext>,
+    _emit_summary: bool,
+) -> (String, ThinBuffer) {
+    let name = module.name;
+    //let buffer = ThinBuffer::new(module.module_llvm.context, true, emit_summary);
+    let buffer = ThinBuffer::new(&module.module_llvm.context);
+    (name, buffer)
+}
+
+/// Prepare "thin" LTO to get run on these modules.
+///
+/// The general structure of ThinLTO is quite different from the structure of
+/// "fat" LTO above. With "fat" LTO all LLVM modules in question are merged into
+/// one giant LLVM module, and then we run more optimization passes over this
+/// big module after internalizing most symbols. Thin LTO, on the other hand,
+/// avoid this large bottleneck through more targeted optimization.
+///
+/// At a high level Thin LTO looks like:
+///
+///    1. Prepare a "summary" of each LLVM module in question which describes
+///       the values inside, cost of the values, etc.
+///    2. Merge the summaries of all modules in question into one "index"
+///    3. Perform some global analysis on this index
+///    4. For each module, use the index and analysis calculated previously to
+///       perform local transformations on the module, for example inlining
+///       small functions from other modules.
+///    5. Run thin-specific optimization passes over each module, and then code
+///       generate everything at the end.
+///
+/// The summary for each module is intended to be quite cheap, and the global
+/// index is relatively quite cheap to create as well. As a result, the goal of
+/// ThinLTO is to reduce the bottleneck on LTO and enable LTO to be used in more
+/// situations. For example one cheap optimization is that we can parallelize
+/// all codegen modules, easily making use of all the cores on a machine.
+///
+/// With all that in mind, the function here is designed at specifically just
+/// calculating the *index* for ThinLTO. This index will then be shared amongst
+/// all of the `LtoModuleCodegen` units returned below and destroyed once
+/// they all go out of scope.
+fn thin_lto(
+    cgcx: &CodegenContext<GccCodegenBackend>,
+    _dcx: DiagCtxtHandle<'_>,
+    modules: Vec<(String, ThinBuffer)>,
+    serialized_modules: Vec<(SerializedModule<ModuleBuffer>, CString)>,
+    tmp_path: TempDir,
+    cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>,
+    //symbols_below_threshold: &[*const libc::c_char],
+) -> Result<(Vec<LtoModuleCodegen<GccCodegenBackend>>, Vec<WorkProduct>), FatalError> {
+    let _timer = cgcx.prof.generic_activity("LLVM_thin_lto_global_analysis");
+    info!("going for that thin, thin LTO");
+
+    /*let green_modules: FxHashMap<_, _> =
+    cached_modules.iter().map(|(_, wp)| (wp.cgu_name.clone(), wp.clone())).collect();*/
+
+    let full_scope_len = modules.len() + serialized_modules.len() + cached_modules.len();
+    let mut thin_buffers = Vec::with_capacity(modules.len());
+    let mut module_names = Vec::with_capacity(full_scope_len);
+    //let mut thin_modules = Vec::with_capacity(full_scope_len);
+
+    for (i, (name, buffer)) in modules.into_iter().enumerate() {
+        info!("local module: {} - {}", i, name);
+        let cname = CString::new(name.as_bytes()).unwrap();
+        /*thin_modules.push(llvm::ThinLTOModule {
+            identifier: cname.as_ptr(),
+            data: buffer.data().as_ptr(),
+            len: buffer.data().len(),
+        });*/
+        thin_buffers.push(buffer);
+        module_names.push(cname);
+    }
+
+    // FIXME: All upstream crates are deserialized internally in the
+    //        function below to extract their summary and modules. Note that
+    //        unlike the loop above we *must* decode and/or read something
+    //        here as these are all just serialized files on disk. An
+    //        improvement, however, to make here would be to store the
+    //        module summary separately from the actual module itself. Right
+    //        now this is store in one large bitcode file, and the entire
+    //        file is deflate-compressed. We could try to bypass some of the
+    //        decompression by storing the index uncompressed and only
+    //        lazily decompressing the bytecode if necessary.
+    //
+    //        Note that truly taking advantage of this optimization will
+    //        likely be further down the road. We'd have to implement
+    //        incremental ThinLTO first where we could actually avoid
+    //        looking at upstream modules entirely sometimes (the contents,
+    //        we must always unconditionally look at the index).
+    let mut serialized = Vec::with_capacity(serialized_modules.len() + cached_modules.len());
+
+    let cached_modules =
+        cached_modules.into_iter().map(|(sm, wp)| (sm, CString::new(wp.cgu_name).unwrap()));
+
+    for (module, name) in serialized_modules.into_iter().chain(cached_modules) {
+        info!("upstream or cached module {:?}", name);
+        /*thin_modules.push(llvm::ThinLTOModule {
+            identifier: name.as_ptr(),
+            data: module.data().as_ptr(),
+            len: module.data().len(),
+        });*/
+
+        match module {
+            SerializedModule::Local(_) => {
+                //let path = module_buffer.0.to_str().expect("path");
+                //let my_path = PathBuf::from(path);
+                //let exists = my_path.exists();
+                /*module.module_llvm.should_combine_object_files = true;
+                module
+                .module_llvm
+                .context
+                .add_driver_option(module_buffer.0.to_str().expect("path"));*/
+            }
+            SerializedModule::FromRlib(_) => unimplemented!("from rlib"),
+            SerializedModule::FromUncompressedFile(_) => {
+                unimplemented!("from uncompressed file")
+            }
+        }
+
+        serialized.push(module);
+        module_names.push(name);
+    }
+
+    // Sanity check
+    //assert_eq!(thin_modules.len(), module_names.len());
+
+    // Delegate to the C++ bindings to create some data here. Once this is a
+    // tried-and-true interface we may wish to try to upstream some of this
+    // to LLVM itself, right now we reimplement a lot of what they do
+    // upstream...
+    /*let data = llvm::LLVMRustCreateThinLTOData(
+        thin_modules.as_ptr(),
+        thin_modules.len() as u32,
+        symbols_below_threshold.as_ptr(),
+        symbols_below_threshold.len() as u32,
+    )
+    .ok_or_else(|| write::llvm_err(dcx, LlvmError::PrepareThinLtoContext))?;
+    */
+
+    let data = ThinData; //(Arc::new(tmp_path))/*(data)*/;
+
+    info!("thin LTO data created");
+
+    /*let (key_map_path, prev_key_map, curr_key_map) =
+        if let Some(ref incr_comp_session_dir) = cgcx.incr_comp_session_dir {
+            let path = incr_comp_session_dir.join(THIN_LTO_KEYS_INCR_COMP_FILE_NAME);
+            // If the previous file was deleted, or we get an IO error
+            // reading the file, then we'll just use `None` as the
+            // prev_key_map, which will force the code to be recompiled.
+            let prev =
+                if path.exists() { ThinLTOKeysMap::load_from_file(&path).ok() } else { None };
+            let curr = ThinLTOKeysMap::from_thin_lto_modules(&data, &thin_modules, &module_names);
+            (Some(path), prev, curr)
+        }
+        else {
+            // If we don't compile incrementally, we don't need to load the
+            // import data from LLVM.
+            assert!(green_modules.is_empty());
+            let curr = ThinLTOKeysMap::default();
+            (None, None, curr)
+        };
+    info!("thin LTO cache key map loaded");
+    info!("prev_key_map: {:#?}", prev_key_map);
+    info!("curr_key_map: {:#?}", curr_key_map);*/
+
+    // Throw our data in an `Arc` as we'll be sharing it across threads. We
+    // also put all memory referenced by the C++ data (buffers, ids, etc)
+    // into the arc as well. After this we'll create a thin module
+    // codegen per module in this data.
+    let shared =
+        Arc::new(ThinShared { data, thin_buffers, serialized_modules: serialized, module_names });
+
+    let copy_jobs = vec![];
+    let mut opt_jobs = vec![];
+
+    info!("checking which modules can be-reused and which have to be re-optimized.");
+    for (module_index, module_name) in shared.module_names.iter().enumerate() {
+        let module_name = module_name_to_str(module_name);
+        /*if let (Some(prev_key_map), true) =
+            (prev_key_map.as_ref(), green_modules.contains_key(module_name))
+        {
+            assert!(cgcx.incr_comp_session_dir.is_some());
+
+            // If a module exists in both the current and the previous session,
+            // and has the same LTO cache key in both sessions, then we can re-use it
+            if prev_key_map.keys.get(module_name) == curr_key_map.keys.get(module_name) {
+                let work_product = green_modules[module_name].clone();
+                copy_jobs.push(work_product);
+                info!(" - {}: re-used", module_name);
+                assert!(cgcx.incr_comp_session_dir.is_some());
+                continue;
+            }
+        }*/
+
+        info!(" - {}: re-compiled", module_name);
+        opt_jobs
+            .push(LtoModuleCodegen::Thin(ThinModule { shared: shared.clone(), idx: module_index }));
+    }
+
+    // Save the current ThinLTO import information for the next compilation
+    // session, overwriting the previous serialized data (if any).
+    /*if let Some(path) = key_map_path {
+        if let Err(err) = curr_key_map.save_to_file(&path) {
+            return Err(write::llvm_err(dcx, LlvmError::WriteThinLtoKey { err }));
+        }
+    }*/
+
+    // NOTE: save the temporary directory used by LTO so that it gets deleted after linking instead
+    // of now.
+    //module.module_llvm.temp_dir = Some(tmp_path);
+    // TODO: save the directory so that it gets deleted later.
+    std::mem::forget(tmp_path);
+
+    Ok((opt_jobs, copy_jobs))
+}
+
+pub unsafe fn optimize_thin_module(
+    thin_module: ThinModule<GccCodegenBackend>,
+    _cgcx: &CodegenContext<GccCodegenBackend>,
+) -> Result<ModuleCodegen<GccContext>, FatalError> {
+    //let dcx = cgcx.create_dcx();
+
+    //let module_name = &thin_module.shared.module_names[thin_module.idx];
+    /*let tm_factory_config = TargetMachineFactoryConfig::new(cgcx, module_name.to_str().unwrap());
+    let tm = (cgcx.tm_factory)(tm_factory_config).map_err(|e| write::llvm_err(&dcx, e))?;*/
+
+    // Right now the implementation we've got only works over serialized
+    // modules, so we create a fresh new LLVM context and parse the module
+    // into that context. One day, however, we may do this for upstream
+    // crates but for locally codegened modules we may be able to reuse
+    // that LLVM Context and Module.
+    //let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
+    //let llmod_raw = parse_module(llcx, module_name, thin_module.data(), &dcx)? as *const _;
+    let mut should_combine_object_files = false;
+    let context = match thin_module.shared.thin_buffers.get(thin_module.idx) {
+        Some(thin_buffer) => Arc::clone(&thin_buffer.context),
+        None => {
+            let context = Context::default();
+            let len = thin_module.shared.thin_buffers.len();
+            let module = &thin_module.shared.serialized_modules[thin_module.idx - len];
+            match *module {
+                SerializedModule::Local(ref module_buffer) => {
+                    let path = module_buffer.0.to_str().expect("path");
+                    context.add_driver_option(path);
+                    should_combine_object_files = true;
+                    /*module.module_llvm.should_combine_object_files = true;
+                    module
+                        .module_llvm
+                        .context
+                        .add_driver_option(module_buffer.0.to_str().expect("path"));*/
+                }
+                SerializedModule::FromRlib(_) => unimplemented!("from rlib"),
+                SerializedModule::FromUncompressedFile(_) => {
+                    unimplemented!("from uncompressed file")
+                }
+            }
+            Arc::new(SyncContext::new(context))
+        }
+    };
+    let module = ModuleCodegen {
+        module_llvm: GccContext { context, should_combine_object_files, temp_dir: None },
+        name: thin_module.name().to_string(),
+        kind: ModuleKind::Regular,
+    };
+    /*{
+        let target = &*module.module_llvm.tm;
+        let llmod = module.module_llvm.llmod();
+        save_temp_bitcode(cgcx, &module, "thin-lto-input");
+
+        // Up next comes the per-module local analyses that we do for Thin LTO.
+        // Each of these functions is basically copied from the LLVM
+        // implementation and then tailored to suit this implementation. Ideally
+        // each of these would be supported by upstream LLVM but that's perhaps
+        // a patch for another day!
+        //
+        // You can find some more comments about these functions in the LLVM
+        // bindings we've got (currently `PassWrapper.cpp`)
+        {
+            let _timer =
+                cgcx.prof.generic_activity_with_arg("LLVM_thin_lto_rename", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTORename(thin_module.shared.data.0, llmod, target) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-rename");
+        }
+
+        {
+            let _timer = cgcx
+                .prof
+                .generic_activity_with_arg("LLVM_thin_lto_resolve_weak", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTOResolveWeak(thin_module.shared.data.0, llmod) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-resolve");
+        }
+
+        {
+            let _timer = cgcx
+                .prof
+                .generic_activity_with_arg("LLVM_thin_lto_internalize", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTOInternalize(thin_module.shared.data.0, llmod) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-internalize");
+        }
+
+        {
+            let _timer =
+                cgcx.prof.generic_activity_with_arg("LLVM_thin_lto_import", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTOImport(thin_module.shared.data.0, llmod, target) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-import");
+        }
+
+        // Alright now that we've done everything related to the ThinLTO
+        // analysis it's time to run some optimizations! Here we use the same
+        // `run_pass_manager` as the "fat" LTO above except that we tell it to
+        // populate a thin-specific pass manager, which presumably LLVM treats a
+        // little differently.
+        {
+            info!("running thin lto passes over {}", module.name);
+            run_pass_manager(cgcx, &dcx, &mut module, true)?;
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-pm");
+        }
+    }*/
+    Ok(module)
+}
+
+pub struct ThinBuffer {
+    context: Arc<SyncContext>,
+}
+
+// TODO: check if this makes sense to make ThinBuffer Send and Sync.
+unsafe impl Send for ThinBuffer {}
+unsafe impl Sync for ThinBuffer {}
+
+impl ThinBuffer {
+    pub(crate) fn new(context: &Arc<SyncContext>) -> Self {
+        Self { context: Arc::clone(context) }
+    }
+}
+
+impl ThinBufferMethods for ThinBuffer {
+    fn data(&self) -> &[u8] {
+        &[]
+    }
+
+    fn thin_link_data(&self) -> &[u8] {
+        unimplemented!();
+    }
+}
+
+pub struct ThinData; //(Arc<TempDir>);
+
+fn module_name_to_str(c_str: &CStr) -> &str {
+    c_str.to_str().unwrap_or_else(|e| {
+        bug!("Encountered non-utf8 GCC module name `{}`: {}", c_str.to_string_lossy(), e)
+    })
+}
diff --git a/compiler/rustc_codegen_gcc/src/back/write.rs b/compiler/rustc_codegen_gcc/src/back/write.rs
index b9c7f72d0b727..802968979c722 100644
--- a/compiler/rustc_codegen_gcc/src/back/write.rs
+++ b/compiler/rustc_codegen_gcc/src/back/write.rs
@@ -31,6 +31,7 @@ pub(crate) unsafe fn codegen(
 
         // NOTE: Only generate object files with GIMPLE when this environment variable is set for
         // now because this requires a particular setup (same gcc/lto1/lto-wrapper commit as libgccjit).
+        // TODO: remove this environment variable.
         let fat_lto = env::var("EMBED_LTO_BITCODE").as_deref() == Ok("1");
 
         let bc_out = cgcx.output_filenames.temp_path(OutputType::Bitcode, module_name);
@@ -56,6 +57,8 @@ pub(crate) unsafe fn codegen(
                     .generic_activity_with_arg("GCC_module_codegen_emit_bitcode", &*module.name);
                 context.add_command_line_option("-flto=auto");
                 context.add_command_line_option("-flto-partition=one");
+                // TODO: remove since we don't want fat objects when it is for Bitcode only.
+                context.add_command_line_option("-ffat-lto-objects");
                 context
                     .compile_to_file(OutputKind::ObjectFile, bc_out.to_str().expect("path to str"));
             }
@@ -104,7 +107,7 @@ pub(crate) unsafe fn codegen(
                     // FIXME(antoyo): segfault in dump_reproducer_to_file() might be caused by
                     // transmuting an rvalue to an lvalue.
                     // Segfault is actually in gcc::jit::reproducer::get_identifier_as_lvalue
-                    context.dump_reproducer_to_file(&format!("/tmp/reproducers/{}.c", module.name));
+                    context.dump_reproducer_to_file(format!("/tmp/reproducers/{}.c", module.name));
                     println!("Dumped reproducer {}", module.name);
                 }
                 if env::var("CG_GCCJIT_DUMP_TO_FILE").as_deref() == Ok("1") {
@@ -113,17 +116,20 @@ pub(crate) unsafe fn codegen(
                     context.set_debug_info(true);
                     context.dump_to_file(path, true);
                 }
-                if should_combine_object_files && fat_lto {
-                    context.add_command_line_option("-flto=auto");
-                    context.add_command_line_option("-flto-partition=one");
+                if should_combine_object_files {
+                    if fat_lto {
+                        context.add_command_line_option("-flto=auto");
+                        context.add_command_line_option("-flto-partition=one");
+
+                        // NOTE: without -fuse-linker-plugin, we get the following error:
+                        // lto1: internal compiler error: decompressed stream: Destination buffer is too small
+                        context.add_driver_option("-fuse-linker-plugin");
+                    }
 
                     context.add_driver_option("-Wl,-r");
                     // NOTE: we need -nostdlib, otherwise, we get the following error:
                     // /usr/bin/ld: cannot find -lgcc_s: No such file or directory
                     context.add_driver_option("-nostdlib");
-                    // NOTE: without -fuse-linker-plugin, we get the following error:
-                    // lto1: internal compiler error: decompressed stream: Destination buffer is too small
-                    context.add_driver_option("-fuse-linker-plugin");
 
                     // NOTE: this doesn't actually generate an executable. With the above flags, it combines the .o files together in another .o.
                     context.compile_to_file(
diff --git a/compiler/rustc_codegen_gcc/src/base.rs b/compiler/rustc_codegen_gcc/src/base.rs
index 2a2d5741d1318..be149ffe5a16f 100644
--- a/compiler/rustc_codegen_gcc/src/base.rs
+++ b/compiler/rustc_codegen_gcc/src/base.rs
@@ -1,8 +1,9 @@
 use std::collections::HashSet;
 use std::env;
+use std::sync::Arc;
 use std::time::Instant;
 
-use gccjit::{FunctionType, GlobalKind};
+use gccjit::{CType, FunctionType, GlobalKind};
 use rustc_codegen_ssa::base::maybe_create_entry_wrapper;
 use rustc_codegen_ssa::mono_item::MonoItemExt;
 use rustc_codegen_ssa::traits::DebugInfoMethods;
@@ -18,8 +19,8 @@ use rustc_target::spec::PanicStrategy;
 
 use crate::builder::Builder;
 use crate::context::CodegenCx;
-use crate::GccContext;
 use crate::{gcc_util, new_context, LockedTargetInfo};
+use crate::{GccContext, SyncContext};
 
 #[cfg(feature = "master")]
 pub fn visibility_to_gcc(linkage: Visibility) -> gccjit::Visibility {
@@ -135,7 +136,7 @@ pub fn compile_codegen_unit(
 
         let target_cpu = gcc_util::target_cpu(tcx.sess);
         if target_cpu != "generic" {
-            context.add_command_line_option(&format!("-march={}", target_cpu));
+            context.add_command_line_option(format!("-march={}", target_cpu));
         }
 
         if tcx
@@ -181,7 +182,24 @@ pub fn compile_codegen_unit(
         context.set_allow_unreachable_blocks(true);
 
         {
-            let cx = CodegenCx::new(&context, cgu, tcx, target_info.supports_128bit_int());
+            // TODO: to make it less error-prone (calling get_target_info() will add the flag
+            // -fsyntax-only), forbid the compilation when get_target_info() is called on a
+            // context.
+            let f16_type_supported = target_info.supports_target_dependent_type(CType::Float16);
+            let f32_type_supported = target_info.supports_target_dependent_type(CType::Float32);
+            let f64_type_supported = target_info.supports_target_dependent_type(CType::Float64);
+            let f128_type_supported = target_info.supports_target_dependent_type(CType::Float128);
+            // TODO: improve this to avoid passing that many arguments.
+            let cx = CodegenCx::new(
+                &context,
+                cgu,
+                tcx,
+                target_info.supports_128bit_int(),
+                f16_type_supported,
+                f32_type_supported,
+                f64_type_supported,
+                f128_type_supported,
+            );
 
             let mono_items = cgu.items_in_deterministic_order(tcx);
             for &(mono_item, data) in &mono_items {
@@ -205,7 +223,11 @@ pub fn compile_codegen_unit(
 
         ModuleCodegen {
             name: cgu_name.to_string(),
-            module_llvm: GccContext { context, should_combine_object_files: false, temp_dir: None },
+            module_llvm: GccContext {
+                context: Arc::new(SyncContext::new(context)),
+                should_combine_object_files: false,
+                temp_dir: None,
+            },
             kind: ModuleKind::Regular,
         }
     }
diff --git a/compiler/rustc_codegen_gcc/src/builder.rs b/compiler/rustc_codegen_gcc/src/builder.rs
index 4a3b6f678c444..307348f595dc9 100644
--- a/compiler/rustc_codegen_gcc/src/builder.rs
+++ b/compiler/rustc_codegen_gcc/src/builder.rs
@@ -25,7 +25,7 @@ use rustc_middle::ty::layout::{
     FnAbiError, FnAbiOfHelpers, FnAbiRequest, HasParamEnv, HasTyCtxt, LayoutError, LayoutOfHelpers,
     TyAndLayout,
 };
-use rustc_middle::ty::{ParamEnv, Ty, TyCtxt, Instance};
+use rustc_middle::ty::{Instance, ParamEnv, Ty, TyCtxt};
 use rustc_span::def_id::DefId;
 use rustc_span::Span;
 use rustc_target::abi::{
@@ -68,7 +68,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         src: RValue<'gcc>,
         order: AtomicOrdering,
     ) -> RValue<'gcc> {
-        let size = src.get_type().get_size();
+        let size = get_maybe_pointer_size(src);
 
         let func = self.current_func();
 
@@ -138,7 +138,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         failure_order: AtomicOrdering,
         weak: bool,
     ) -> RValue<'gcc> {
-        let size = src.get_type().get_size();
+        let size = get_maybe_pointer_size(src);
         let compare_exchange =
             self.context.get_builtin_function(&format!("__atomic_compare_exchange_{}", size));
         let order = self.context.new_rvalue_from_int(self.i32_type, order.to_gcc());
@@ -153,7 +153,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
         // NOTE: not sure why, but we have the wrong type here.
         let int_type = compare_exchange.get_param(2).to_rvalue().get_type();
-        let src = self.context.new_cast(self.location, src, int_type);
+        let src = self.context.new_bitcast(self.location, src, int_type);
         self.context.new_call(
             self.location,
             compare_exchange,
@@ -190,8 +190,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let casted_args: Vec<_> = param_types
             .into_iter()
             .zip(args.iter())
-            .enumerate()
-            .map(|(_i, (expected_ty, &actual_val))| {
+            .map(|(expected_ty, &actual_val)| {
                 let actual_ty = actual_val.get_type();
                 if expected_ty != actual_ty {
                     self.bitcast(actual_val, expected_ty)
@@ -225,7 +224,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
         let mut on_stack_param_indices = FxHashSet::default();
         if let Some(indices) = self.on_stack_params.borrow().get(&gcc_func) {
-            on_stack_param_indices = indices.clone();
+            on_stack_param_indices.clone_from(indices);
         }
 
         if all_args_match {
@@ -253,11 +252,26 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                     {
                         self.context.new_cast(self.location, actual_val, expected_ty)
                     } else if on_stack_param_indices.contains(&index) {
-                        actual_val.dereference(self.location).to_rvalue()
+                        let ty = actual_val.get_type();
+                        // It's possible that the value behind the pointer is actually not exactly
+                        // the expected type, so to go around that, we add a cast before
+                        // dereferencing the value.
+                        if let Some(pointee_val) = ty.get_pointee()
+                            && pointee_val != expected_ty
+                        {
+                            let new_val = self.context.new_cast(
+                                self.location,
+                                actual_val,
+                                expected_ty.make_pointer(),
+                            );
+                            new_val.dereference(self.location).to_rvalue()
+                        } else {
+                            actual_val.dereference(self.location).to_rvalue()
+                        }
                     } else {
                         assert!(
-                            !((actual_ty.is_vector() && !expected_ty.is_vector())
-                                || (!actual_ty.is_vector() && expected_ty.is_vector())),
+                            (!expected_ty.is_vector() || actual_ty.is_vector())
+                                && (expected_ty.is_vector() || !actual_ty.is_vector()),
                             "{:?} ({}) -> {:?} ({}), index: {:?}[{}]",
                             actual_ty,
                             actual_ty.is_vector(),
@@ -277,8 +291,8 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             .collect();
 
         // NOTE: to take into account variadic functions.
-        for i in casted_args.len()..args.len() {
-            casted_args.push(args[i]);
+        for arg in args.iter().skip(casted_args.len()) {
+            casted_args.push(*arg);
         }
 
         Cow::Owned(casted_args)
@@ -353,7 +367,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             let function_address_names = self.function_address_names.borrow();
             let original_function_name = function_address_names.get(&func_ptr);
             llvm::adjust_intrinsic_arguments(
-                &self,
+                self,
                 gcc_func,
                 args.into(),
                 &func_name,
@@ -361,7 +375,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             )
         };
         let args_adjusted = args.len() != previous_arg_count;
-        let args = self.check_ptr_call("call", func_ptr, &*args);
+        let args = self.check_ptr_call("call", func_ptr, &args);
 
         // gccjit requires to use the result of functions, even when it's not used.
         // That's why we assign the result to a local or call add_eval().
@@ -373,7 +387,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             unsafe { RETURN_VALUE_COUNT += 1 };
             let return_value = self.cx.context.new_call_through_ptr(self.location, func_ptr, &args);
             let return_value = llvm::adjust_intrinsic_return_value(
-                &self,
+                self,
                 return_value,
                 &func_name,
                 &args,
@@ -441,7 +455,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         self.block.add_assignment(
             self.location,
             result,
-            self.cx.context.new_call(self.location, func, &args),
+            self.cx.context.new_call(self.location, func, args),
         );
         result.to_rvalue()
     }
@@ -596,7 +610,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
     ) -> RValue<'gcc> {
         let try_block = self.current_func().new_block("try");
 
-        let current_block = self.block.clone();
+        let current_block = self.block;
         self.block = try_block;
         let call = self.call(typ, fn_attrs, None, func, args, None, instance); // TODO(antoyo): use funclet here?
         self.block = current_block;
@@ -630,8 +644,9 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         then: Block<'gcc>,
         catch: Block<'gcc>,
         _funclet: Option<&Funclet>,
+        instance: Option<Instance<'tcx>>,
     ) -> RValue<'gcc> {
-        let call_site = self.call(typ, fn_attrs, None, func, args, None);
+        let call_site = self.call(typ, fn_attrs, None, func, args, None, instance);
         let condition = self.context.new_rvalue_from_int(self.bool_type, 1);
         self.llbb().end_with_conditional(self.location, condition, then, catch);
         if let Some(_fn_abi) = fn_abi {
@@ -749,6 +764,24 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
             // FIXME(antoyo): this seems to produce the wrong result.
             return self.context.new_call(self.location, fmodf, &[a, b]);
         }
+
+        #[cfg(feature = "master")]
+        match self.cx.type_kind(a_type) {
+            TypeKind::Half | TypeKind::Float => {
+                let fmodf = self.context.get_builtin_function("fmodf");
+                return self.context.new_call(self.location, fmodf, &[a, b]);
+            }
+            TypeKind::Double => {
+                let fmod = self.context.get_builtin_function("fmod");
+                return self.context.new_call(self.location, fmod, &[a, b]);
+            }
+            TypeKind::FP128 => {
+                let fmodl = self.context.get_builtin_function("fmodl");
+                return self.context.new_call(self.location, fmodl, &[a, b]);
+            }
+            _ => (),
+        }
+
         if let Some(vector_type) = a_type_unqualified.dyncast_vector() {
             assert_eq!(a_type_unqualified, b.get_type().unqualified());
 
@@ -903,11 +936,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // TODO(antoyo): It might be better to return a LValue, but fixing the rustc API is non-trivial.
         self.stack_var_count.set(self.stack_var_count.get() + 1);
         self.current_func()
-            .new_local(
-                self.location,
-                ty,
-                &format!("stack_var_{}", self.stack_var_count.get()),
-            )
+            .new_local(self.location, ty, &format!("stack_var_{}", self.stack_var_count.get()))
             .get_address(self.location)
     }
 
@@ -993,7 +1022,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
             }
         }
 
-        let val = if let Some(_) = place.val.llextra {
+        let val = if place.val.llextra.is_some() {
             // FIXME: Merge with the `else` below?
             OperandValue::Ref(place.val)
         } else if place.layout.is_gcc_immediate() {
@@ -1125,7 +1154,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // the following cast is required to avoid this error:
         // gcc_jit_context_new_call: mismatching types for argument 2 of function "__atomic_store_4": assignment to param arg1 (type: int) from loadedValue3577 (type: unsigned int  __attribute__((aligned(4))))
         let int_type = atomic_store.get_param(1).to_rvalue().get_type();
-        let value = self.context.new_cast(self.location, value, int_type);
+        let value = self.context.new_bitcast(self.location, value, int_type);
         self.llbb().add_eval(
             self.location,
             self.context.new_call(self.location, atomic_store, &[ptr, value, ordering]),
@@ -1172,7 +1201,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // NOTE: due to opaque pointers now being used, we need to cast here.
         let ptr = self.context.new_cast(self.location, ptr, typ.make_pointer());
         // NOTE: array indexing is always considered in bounds in GCC (TODO(antoyo): to be verified).
-        let mut indices = indices.into_iter();
+        let mut indices = indices.iter();
         let index = indices.next().expect("first index in inbounds_gep");
         let mut result = self.context.new_array_access(self.location, ptr, *index);
         for index in indices {
@@ -1589,7 +1618,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         src: RValue<'gcc>,
         order: AtomicOrdering,
     ) -> RValue<'gcc> {
-        let size = src.get_type().get_size();
+        let size = get_maybe_pointer_size(src);
         let name = match op {
             AtomicRmwBinOp::AtomicXchg => format!("__atomic_exchange_{}", size),
             AtomicRmwBinOp::AtomicAdd => format!("__atomic_fetch_add_{}", size),
@@ -1620,7 +1649,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         let dst = self.context.new_cast(self.location, dst, volatile_void_ptr_type);
         // FIXME(antoyo): not sure why, but we have the wrong type here.
         let new_src_type = atomic_function.get_param(1).to_rvalue().get_type();
-        let src = self.context.new_cast(self.location, src, new_src_type);
+        let src = self.context.new_bitcast(self.location, src, new_src_type);
         let res = self.context.new_call(self.location, atomic_function, &[dst, src, order]);
         self.context.new_cast(self.location, res, src.get_type())
     }
@@ -1661,7 +1690,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         _instance: Option<Instance<'tcx>>,
     ) -> RValue<'gcc> {
         // FIXME(antoyo): remove when having a proper API.
-        let gcc_func = unsafe { std::mem::transmute(func) };
+        let gcc_func = unsafe { std::mem::transmute::<RValue<'gcc>, Function<'gcc>>(func) };
         let call = if self.functions.borrow().values().any(|value| *value == gcc_func) {
             self.function_call(func, args, funclet)
         } else {
@@ -1676,11 +1705,6 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
 
     fn zext(&mut self, value: RValue<'gcc>, dest_typ: Type<'gcc>) -> RValue<'gcc> {
         // FIXME(antoyo): this does not zero-extend.
-        if value.get_type().is_bool() && dest_typ.is_i8(&self.cx) {
-            // FIXME(antoyo): hack because base::from_immediate converts i1 to i8.
-            // Fix the code in codegen_ssa::base::from_immediate.
-            return value;
-        }
         self.gcc_int_cast(value, dest_typ)
     }
 
@@ -2049,7 +2073,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 self.context.new_rvalue_from_vector(self.location, mask_type, &vector_elements);
             let shifted = self.context.new_rvalue_vector_perm(self.location, res, res, mask);
             shift *= 2;
-            res = op(res, shifted, &self.context);
+            res = op(res, shifted, self.context);
         }
         self.context
             .new_vector_access(self.location, res, self.context.new_rvalue_zero(self.int_type))
@@ -2065,7 +2089,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
     }
 
     pub fn vector_reduce_op(&mut self, src: RValue<'gcc>, op: BinaryOp) -> RValue<'gcc> {
-        let loc = self.location.clone();
+        let loc = self.location;
         self.vector_reduce(src, |a, b, context| context.new_binary_op(loc, op, a.get_type(), a, b))
     }
 
@@ -2082,7 +2106,6 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let vector_type = src.get_type().unqualified().dyncast_vector().expect("vector type");
         let element_count = vector_type.get_num_units();
         (0..element_count)
-            .into_iter()
             .map(|i| {
                 self.context
                     .new_vector_access(
@@ -2113,7 +2136,6 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let vector_type = src.get_type().unqualified().dyncast_vector().expect("vector type");
         let element_count = vector_type.get_num_units();
         (0..element_count)
-            .into_iter()
             .map(|i| {
                 self.context
                     .new_vector_access(
@@ -2133,7 +2155,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
     // Inspired by Hacker's Delight min implementation.
     pub fn vector_reduce_min(&mut self, src: RValue<'gcc>) -> RValue<'gcc> {
-        let loc = self.location.clone();
+        let loc = self.location;
         self.vector_reduce(src, |a, b, context| {
             let differences_or_zeros = difference_or_zero(loc, a, b, context);
             context.new_binary_op(loc, BinaryOp::Plus, b.get_type(), b, differences_or_zeros)
@@ -2142,7 +2164,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
     // Inspired by Hacker's Delight max implementation.
     pub fn vector_reduce_max(&mut self, src: RValue<'gcc>) -> RValue<'gcc> {
-        let loc = self.location.clone();
+        let loc = self.location;
         self.vector_reduce(src, |a, b, context| {
             let differences_or_zeros = difference_or_zero(loc, a, b, context);
             context.new_binary_op(loc, BinaryOp::Minus, a.get_type(), a, differences_or_zeros)
@@ -2337,7 +2359,7 @@ impl<'tcx> HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
 
 impl<'tcx> HasTargetSpec for Builder<'_, '_, 'tcx> {
     fn target_spec(&self) -> &Target {
-        &self.cx.target_spec()
+        self.cx.target_spec()
     }
 }
 
@@ -2422,3 +2444,19 @@ impl ToGccOrdering for AtomicOrdering {
         ordering as i32
     }
 }
+
+// Needed because gcc 12 `get_size()` doesn't work on pointers.
+#[cfg(feature = "master")]
+fn get_maybe_pointer_size(value: RValue<'_>) -> u32 {
+    value.get_type().get_size()
+}
+
+#[cfg(not(feature = "master"))]
+fn get_maybe_pointer_size(value: RValue<'_>) -> u32 {
+    let type_ = value.get_type();
+    if type_.get_pointee().is_some() {
+        std::mem::size_of::<*const ()>() as _
+    } else {
+        type_.get_size()
+    }
+}
diff --git a/compiler/rustc_codegen_gcc/src/callee.rs b/compiler/rustc_codegen_gcc/src/callee.rs
index 84f49b6856d4d..9ad2e90122f58 100644
--- a/compiler/rustc_codegen_gcc/src/callee.rs
+++ b/compiler/rustc_codegen_gcc/src/callee.rs
@@ -28,7 +28,7 @@ pub fn get_fn<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, instance: Instance<'tcx>)
 
     let fn_abi = cx.fn_abi_of_instance(instance, ty::List::empty());
 
-    let func = if let Some(_func) = cx.get_declared_value(&sym) {
+    let func = if let Some(_func) = cx.get_declared_value(sym) {
         // FIXME(antoyo): we never reach this because get_declared_value only returns global variables
         // and here we try to get a function.
         unreachable!();
@@ -68,7 +68,7 @@ pub fn get_fn<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, instance: Instance<'tcx>)
         }*/
     } else {
         cx.linkage.set(FunctionType::Extern);
-        let func = cx.declare_fn(&sym, &fn_abi);
+        let func = cx.declare_fn(sym, fn_abi);
 
         attributes::from_fn_attrs(cx, func, instance);
 
diff --git a/compiler/rustc_codegen_gcc/src/common.rs b/compiler/rustc_codegen_gcc/src/common.rs
index fa8a1ec037c5c..19333689aaa9f 100644
--- a/compiler/rustc_codegen_gcc/src/common.rs
+++ b/compiler/rustc_codegen_gcc/src/common.rs
@@ -21,7 +21,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
     fn global_string(&self, string: &str) -> LValue<'gcc> {
         // TODO(antoyo): handle non-null-terminated strings.
-        let string = self.context.new_string_literal(&*string);
+        let string = self.context.new_string_literal(string);
         let sym = self.generate_local_symbol_name("str");
         let global = self.declare_private_global(&sym, self.val_ty(string));
         global.global_set_initializer_rvalue(string);
@@ -187,7 +187,8 @@ impl<'gcc, 'tcx> ConstMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
                     return self
                         .context
                         .new_rvalue_from_double(ty, f32::from_bits(data as u32) as f64);
-                } else if ty == self.double_type {
+                }
+                if ty == self.double_type {
                     return self.context.new_rvalue_from_double(ty, f64::from_bits(data as u64));
                 }
 
@@ -297,7 +298,7 @@ impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
         } else if self.is_ulonglong(cx) {
             cx.longlong_type
         } else {
-            self.clone()
+            *self
         }
     }
 
@@ -323,7 +324,7 @@ impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
         } else if self.is_longlong(cx) {
             cx.ulonglong_type
         } else {
-            self.clone()
+            *self
         }
     }
 }
@@ -436,7 +437,7 @@ impl<'gcc, 'tcx> TypeReflection<'gcc, 'tcx> for Type<'gcc> {
     }
 
     fn is_vector(&self) -> bool {
-        let mut typ = self.clone();
+        let mut typ = *self;
         loop {
             if typ.dyncast_vector().is_some() {
                 return true;
diff --git a/compiler/rustc_codegen_gcc/src/consts.rs b/compiler/rustc_codegen_gcc/src/consts.rs
index 3d73a60b25504..ba7e08e33efa3 100644
--- a/compiler/rustc_codegen_gcc/src/consts.rs
+++ b/compiler/rustc_codegen_gcc/src/consts.rs
@@ -1,15 +1,16 @@
 #[cfg(feature = "master")]
 use gccjit::{FnAttribute, VarAttribute, Visibility};
-use gccjit::{Function, GlobalKind, LValue, RValue, ToRValue};
-use rustc_codegen_ssa::traits::{BaseTypeMethods, ConstMethods, DerivedTypeMethods, StaticMethods};
+use gccjit::{Function, GlobalKind, LValue, RValue, ToRValue, Type};
+use rustc_codegen_ssa::traits::{BaseTypeMethods, ConstMethods, StaticMethods};
+use rustc_hir::def::DefKind;
+use rustc_middle::bug;
 use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs};
 use rustc_middle::mir::interpret::{
     self, read_target_uint, ConstAllocation, ErrorHandled, Scalar as InterpScalar,
 };
-use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::span_bug;
 use rustc_middle::ty::layout::LayoutOf;
-use rustc_middle::ty::{self, Instance, Ty};
+use rustc_middle::ty::{self, Instance};
 use rustc_span::def_id::DefId;
 use rustc_target::abi::{self, Align, HasDataLayout, Primitive, Size, WrappingRange};
 
@@ -63,16 +64,15 @@ impl<'gcc, 'tcx> StaticMethods for CodegenCx<'gcc, 'tcx> {
         global_value
     }
 
+    #[cfg_attr(not(feature = "master"), allow(unused_mut))]
     fn codegen_static(&self, def_id: DefId) {
         let attrs = self.tcx.codegen_fn_attrs(def_id);
 
-        let value = match codegen_static_initializer(&self, def_id) {
-            Ok((value, _)) => value,
+        let Ok((value, alloc)) = codegen_static_initializer(self, def_id) else {
             // Error has already been reported
-            Err(_) => return,
+            return;
         };
-
-        let global = self.get_static(def_id);
+        let alloc = alloc.inner();
 
         // boolean SSA values are i1, but they have to be stored in i8 slots,
         // otherwise some LLVM optimization passes don't work as expected
@@ -81,23 +81,25 @@ impl<'gcc, 'tcx> StaticMethods for CodegenCx<'gcc, 'tcx> {
             unimplemented!();
         };
 
-        let instance = Instance::mono(self.tcx, def_id);
-        let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
-        let gcc_type = self.layout_of(ty).gcc_type(self);
+        let is_thread_local = attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL);
+        let global = self.get_static_inner(def_id, val_llty);
 
-        set_global_alignment(self, global, self.align_of(ty));
+        #[cfg(feature = "master")]
+        if global.to_rvalue().get_type() != val_llty {
+            global.to_rvalue().set_type(val_llty);
+        }
+        set_global_alignment(self, global, alloc.align);
 
-        let value = self.bitcast_if_needed(value, gcc_type);
         global.global_set_initializer_rvalue(value);
 
         // As an optimization, all shared statics which do not have interior
         // mutability are placed into read-only memory.
-        if !self.tcx.static_mutability(def_id).unwrap().is_mut() && self.type_is_freeze(ty) {
+        if alloc.mutability.is_not() {
             #[cfg(feature = "master")]
             global.global_set_readonly();
         }
 
-        if attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL) {
+        if is_thread_local {
             // Do not allow LLVM to change the alignment of a TLS on macOS.
             //
             // By default a global's alignment can be freely increased.
@@ -205,35 +207,49 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
     pub fn get_static(&self, def_id: DefId) -> LValue<'gcc> {
         let instance = Instance::mono(self.tcx, def_id);
-        let fn_attrs = self.tcx.codegen_fn_attrs(def_id);
+        let DefKind::Static { nested, .. } = self.tcx.def_kind(def_id) else { bug!() };
+        // Nested statics do not have a type, so pick a random type and let `define_static` figure out
+        // the gcc type from the actual evaluated initializer.
+        let gcc_type = if nested {
+            self.type_i8()
+        } else {
+            let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
+            self.layout_of(ty).gcc_type(self)
+        };
+
+        self.get_static_inner(def_id, gcc_type)
+    }
+
+    pub(crate) fn get_static_inner(&self, def_id: DefId, gcc_type: Type<'gcc>) -> LValue<'gcc> {
+        let instance = Instance::mono(self.tcx, def_id);
         if let Some(&global) = self.instances.borrow().get(&instance) {
+            trace!("used cached value");
             return global;
         }
 
-        let defined_in_current_codegen_unit =
-            self.codegen_unit.items().contains_key(&MonoItem::Static(def_id));
-        assert!(
-            !defined_in_current_codegen_unit,
-            "consts::get_static() should always hit the cache for \
-                 statics defined in the same CGU, but did not for `{:?}`",
-            def_id
-        );
-
-        let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
+        // FIXME: Once we stop removing globals in `codegen_static`, we can uncomment this code.
+        // let defined_in_current_codegen_unit =
+        //     self.codegen_unit.items().contains_key(&MonoItem::Static(def_id));
+        // assert!(
+        //     !defined_in_current_codegen_unit,
+        //     "consts::get_static() should always hit the cache for \
+        //          statics defined in the same CGU, but did not for `{:?}`",
+        //     def_id
+        // );
         let sym = self.tcx.symbol_name(instance).name;
+        let fn_attrs = self.tcx.codegen_fn_attrs(def_id);
 
         let global = if def_id.is_local() && !self.tcx.is_foreign_item(def_id) {
-            let llty = self.layout_of(ty).gcc_type(self);
             if let Some(global) = self.get_declared_value(sym) {
-                if self.val_ty(global) != self.type_ptr_to(llty) {
+                if self.val_ty(global) != self.type_ptr_to(gcc_type) {
                     span_bug!(self.tcx.def_span(def_id), "Conflicting types for static");
                 }
             }
 
             let is_tls = fn_attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL);
             let global = self.declare_global(
-                &sym,
-                llty,
+                sym,
+                gcc_type,
                 GlobalKind::Exported,
                 is_tls,
                 fn_attrs.link_section,
@@ -246,7 +262,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
             global
         } else {
-            check_and_apply_linkage(&self, &fn_attrs, ty, sym)
+            check_and_apply_linkage(self, fn_attrs, gcc_type, sym)
         };
 
         if !def_id.is_local() {
@@ -360,18 +376,14 @@ fn codegen_static_initializer<'gcc, 'tcx>(
 fn check_and_apply_linkage<'gcc, 'tcx>(
     cx: &CodegenCx<'gcc, 'tcx>,
     attrs: &CodegenFnAttrs,
-    ty: Ty<'tcx>,
+    gcc_type: Type<'gcc>,
     sym: &str,
 ) -> LValue<'gcc> {
     let is_tls = attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL);
-    let gcc_type = cx.layout_of(ty).gcc_type(cx);
     if let Some(linkage) = attrs.import_linkage {
         // Declare a symbol `foo` with the desired linkage.
-        let global1 = cx.declare_global_with_linkage(
-            &sym,
-            cx.type_i8(),
-            base::global_linkage_to_gcc(linkage),
-        );
+        let global1 =
+            cx.declare_global_with_linkage(sym, cx.type_i8(), base::global_linkage_to_gcc(linkage));
 
         // Declare an internal global `extern_with_linkage_foo` which
         // is initialized with the address of `foo`.  If `foo` is
@@ -380,7 +392,7 @@ fn check_and_apply_linkage<'gcc, 'tcx>(
         // `extern_with_linkage_foo` will instead be initialized to
         // zero.
         let mut real_name = "_rust_extern_with_linkage_".to_string();
-        real_name.push_str(&sym);
+        real_name.push_str(sym);
         let global2 = cx.define_global(&real_name, gcc_type, is_tls, attrs.link_section);
         // TODO(antoyo): set linkage.
         let value = cx.const_ptrcast(global1.get_address(None), gcc_type);
@@ -397,6 +409,6 @@ fn check_and_apply_linkage<'gcc, 'tcx>(
         // don't do this then linker errors can be generated where the linker
         // complains that one object files has a thread local version of the
         // symbol and another one doesn't.
-        cx.declare_global(&sym, gcc_type, GlobalKind::Imported, is_tls, attrs.link_section)
+        cx.declare_global(sym, gcc_type, GlobalKind::Imported, is_tls, attrs.link_section)
     }
 }
diff --git a/compiler/rustc_codegen_gcc/src/context.rs b/compiler/rustc_codegen_gcc/src/context.rs
index 1d689c9ac0ef1..86a5000a72325 100644
--- a/compiler/rustc_codegen_gcc/src/context.rs
+++ b/compiler/rustc_codegen_gcc/src/context.rs
@@ -68,6 +68,10 @@ pub struct CodegenCx<'gcc, 'tcx> {
     pub sizet_type: Type<'gcc>,
 
     pub supports_128bit_integers: bool,
+    pub supports_f16_type: bool,
+    pub supports_f32_type: bool,
+    pub supports_f64_type: bool,
+    pub supports_f128_type: bool,
 
     pub float_type: Type<'gcc>,
     pub double_type: Type<'gcc>,
@@ -110,7 +114,7 @@ pub struct CodegenCx<'gcc, 'tcx> {
     local_gen_sym_counter: Cell<usize>,
 
     eh_personality: Cell<Option<RValue<'gcc>>>,
-    #[cfg(feature="master")]
+    #[cfg(feature = "master")]
     pub rust_try_fn: Cell<Option<(Type<'gcc>, Function<'gcc>)>>,
 
     pub pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>,
@@ -122,16 +126,21 @@ pub struct CodegenCx<'gcc, 'tcx> {
     /// FIXME(antoyo): fix the rustc API to avoid having this hack.
     pub structs_as_pointer: RefCell<FxHashSet<RValue<'gcc>>>,
 
-    #[cfg(feature="master")]
+    #[cfg(feature = "master")]
     pub cleanup_blocks: RefCell<FxHashSet<Block<'gcc>>>,
 }
 
 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
+    #[allow(clippy::too_many_arguments)]
     pub fn new(
         context: &'gcc Context<'gcc>,
         codegen_unit: &'tcx CodegenUnit<'tcx>,
         tcx: TyCtxt<'tcx>,
         supports_128bit_integers: bool,
+        supports_f16_type: bool,
+        supports_f32_type: bool,
+        supports_f64_type: bool,
+        supports_f128_type: bool,
     ) -> Self {
         let create_type = |ctype, rust_type| {
             let layout = tcx.layout_of(ParamEnv::reveal_all().and(rust_type)).unwrap();
@@ -304,6 +313,10 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             sizet_type,
 
             supports_128bit_integers,
+            supports_f16_type,
+            supports_f32_type,
+            supports_f64_type,
+            supports_f128_type,
 
             float_type,
             double_type,
@@ -324,11 +337,11 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             struct_types: Default::default(),
             local_gen_sym_counter: Cell::new(0),
             eh_personality: Cell::new(None),
-            #[cfg(feature="master")]
+            #[cfg(feature = "master")]
             rust_try_fn: Cell::new(None),
             pointee_infos: Default::default(),
             structs_as_pointer: Default::default(),
-            #[cfg(feature="master")]
+            #[cfg(feature = "master")]
             cleanup_blocks: Default::default(),
         };
         // TODO(antoyo): instead of doing this, add SsizeT to libgccjit.
@@ -385,7 +398,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     }
 
     pub fn sess(&self) -> &'tcx Session {
-        &self.tcx.sess
+        self.tcx.sess
     }
 
     pub fn bitcast_if_needed(
@@ -432,7 +445,9 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         let func_name = self.tcx.symbol_name(instance).name;
 
         let func = if self.intrinsics.borrow().contains_key(func_name) {
-            self.intrinsics.borrow()[func_name].clone()
+            self.intrinsics.borrow()[func_name]
+        } else if let Some(variable) = self.get_declared_value(func_name) {
+            return variable;
         } else {
             get_fn(self, instance)
         };
@@ -485,7 +500,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
                 let symbol_name = tcx.symbol_name(instance).name;
                 let fn_abi = self.fn_abi_of_instance(instance, ty::List::empty());
                 self.linkage.set(FunctionType::Extern);
-                let func = self.declare_fn(symbol_name, &fn_abi);
+                let func = self.declare_fn(symbol_name, fn_abi);
                 let func: RValue<'gcc> = unsafe { std::mem::transmute(func) };
                 func
             }
@@ -496,7 +511,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
                     "rust_eh_personality"
                 };
                 let func = self.declare_func(name, self.type_i32(), &[], true);
-                unsafe { std::mem::transmute(func) }
+                unsafe { std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(func) }
             }
         };
         // TODO(antoyo): apply target cpu attributes.
@@ -505,7 +520,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     }
 
     fn sess(&self) -> &Session {
-        &self.tcx.sess
+        self.tcx.sess
     }
 
     fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
@@ -522,7 +537,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
 
     fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function> {
         let entry_name = self.sess().target.entry_name.as_ref();
-        if self.get_declared_value(entry_name).is_none() {
+        if !self.functions.borrow().contains_key(entry_name) {
             Some(self.declare_entry_fn(entry_name, fn_type, ()))
         } else {
             // If the symbol already exists, it is an error: for example, the user wrote
@@ -614,7 +629,7 @@ impl<'b, 'tcx> CodegenCx<'b, 'tcx> {
         // user defined names
         let mut name = String::with_capacity(prefix.len() + 6);
         name.push_str(prefix);
-        name.push_str(".");
+        name.push('.');
         name.push_str(&(idx as u64).to_base(ALPHANUMERIC_ONLY));
         name
     }
diff --git a/compiler/rustc_codegen_gcc/src/debuginfo.rs b/compiler/rustc_codegen_gcc/src/debuginfo.rs
index 1d0a6d9f09bb9..3d9ea278a6399 100644
--- a/compiler/rustc_codegen_gcc/src/debuginfo.rs
+++ b/compiler/rustc_codegen_gcc/src/debuginfo.rs
@@ -90,7 +90,7 @@ fn compute_mir_scopes<'gcc, 'tcx>(
 /// FIXME(tempdragon/?): Add Scope Support Here.
 fn make_mir_scope<'gcc, 'tcx>(
     cx: &CodegenCx<'gcc, 'tcx>,
-    instance: Instance<'tcx>,
+    _instance: Instance<'tcx>,
     mir: &Body<'tcx>,
     variables: &Option<BitSet<SourceScope>>,
     debug_context: &mut FunctionDebugContext<'tcx, (), Location<'gcc>>,
@@ -103,7 +103,7 @@ fn make_mir_scope<'gcc, 'tcx>(
 
     let scope_data = &mir.source_scopes[scope];
     let parent_scope = if let Some(parent) = scope_data.parent_scope {
-        make_mir_scope(cx, instance, mir, variables, debug_context, instantiated, parent);
+        make_mir_scope(cx, _instance, mir, variables, debug_context, instantiated, parent);
         debug_context.scopes[parent]
     } else {
         // The root is the function itself.
@@ -117,7 +117,7 @@ fn make_mir_scope<'gcc, 'tcx>(
         return;
     };
 
-    if let Some(vars) = variables {
+    if let Some(ref vars) = *variables {
         if !vars.contains(scope) && scope_data.inlined.is_none() {
             // Do not create a DIScope if there are no variables defined in this
             // MIR `SourceScope`, and it's not `inlined`, to avoid debuginfo bloat.
@@ -135,8 +135,14 @@ fn make_mir_scope<'gcc, 'tcx>(
     let inlined_at = scope_data.inlined.map(|(_, callsite_span)| {
         // FIXME(eddyb) this doesn't account for the macro-related
         // `Span` fixups that `rustc_codegen_ssa::mir::debuginfo` does.
-        let callsite_scope = parent_scope.adjust_dbg_scope_for_span(cx, callsite_span);
-        cx.dbg_loc(callsite_scope, parent_scope.inlined_at, callsite_span)
+
+        // TODO(tempdragon): Add scope support and then revert to cg_llvm version of this closure
+        // NOTE: These variables passed () here.
+        // Changed to comply to clippy.
+
+        /* let callsite_scope =  */
+        parent_scope.adjust_dbg_scope_for_span(cx, callsite_span);
+        cx.dbg_loc(/* callsite_scope */ (), parent_scope.inlined_at, callsite_span)
     });
     let p_inlined_at = parent_scope.inlined_at;
     // TODO(tempdragon): dbg_scope: Add support for scope extension here.
@@ -224,7 +230,7 @@ impl<'gcc, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
             file_end_pos: BytePos(0),
         };
         let mut fn_debug_context = FunctionDebugContext {
-            scopes: IndexVec::from_elem(empty_scope, &mir.source_scopes.as_slice()),
+            scopes: IndexVec::from_elem(empty_scope, mir.source_scopes.as_slice()),
             inlined_function_scopes: Default::default(),
         };
 
@@ -273,16 +279,19 @@ impl<'gcc, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     ) -> Self::DILocation {
         let pos = span.lo();
         let DebugLoc { file, line, col } = self.lookup_debug_loc(pos);
-        let loc = match &file.name {
-            rustc_span::FileName::Real(name) => match name {
-                rustc_span::RealFileName::LocalPath(name) => {
+        let loc = match file.name {
+            rustc_span::FileName::Real(ref name) => match *name {
+                rustc_span::RealFileName::LocalPath(ref name) => {
                     if let Some(name) = name.to_str() {
                         self.context.new_location(name, line as i32, col as i32)
                     } else {
                         Location::null()
                     }
                 }
-                rustc_span::RealFileName::Remapped { local_path, virtual_name: _ } => {
+                rustc_span::RealFileName::Remapped {
+                    ref local_path,
+                    virtual_name: ref _unused,
+                } => {
                     if let Some(name) = local_path.as_ref() {
                         if let Some(name) = name.to_str() {
                             self.context.new_location(name, line as i32, col as i32)
diff --git a/compiler/rustc_codegen_gcc/src/declare.rs b/compiler/rustc_codegen_gcc/src/declare.rs
index db6edbab12d4d..a2b158ee0a7e8 100644
--- a/compiler/rustc_codegen_gcc/src/declare.rs
+++ b/compiler/rustc_codegen_gcc/src/declare.rs
@@ -35,7 +35,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
     pub fn declare_unnamed_global(&self, ty: Type<'gcc>) -> LValue<'gcc> {
         let name = self.generate_local_symbol_name("global");
-        self.context.new_global(None, GlobalKind::Internal, ty, &name)
+        self.context.new_global(None, GlobalKind::Internal, ty, name)
     }
 
     pub fn declare_global_with_linkage(
@@ -176,16 +176,14 @@ fn declare_raw_fn<'gcc>(
         cx.functions.borrow()[name]
     } else {
         let params: Vec<_> = param_types
-            .into_iter()
+            .iter()
             .enumerate()
-            .map(|(index, param)| {
-                cx.context.new_parameter(None, *param, &format!("param{}", index))
-            }) // TODO(antoyo): set name.
+            .map(|(index, param)| cx.context.new_parameter(None, *param, format!("param{}", index))) // TODO(antoyo): set name.
             .collect();
         #[cfg(not(feature = "master"))]
-        let name = mangle_name(name);
+        let name = &mangle_name(name);
         let func =
-            cx.context.new_function(None, cx.linkage.get(), return_type, &params, &name, variadic);
+            cx.context.new_function(None, cx.linkage.get(), return_type, &params, name, variadic);
         cx.functions.borrow_mut().insert(name.to_string(), func);
 
         #[cfg(feature = "master")]
@@ -200,10 +198,10 @@ fn declare_raw_fn<'gcc>(
             // create a wrapper function that calls rust_eh_personality.
 
             let params: Vec<_> = param_types
-                .into_iter()
+                .iter()
                 .enumerate()
                 .map(|(index, param)| {
-                    cx.context.new_parameter(None, *param, &format!("param{}", index))
+                    cx.context.new_parameter(None, *param, format!("param{}", index))
                 }) // TODO(antoyo): set name.
                 .collect();
             let gcc_func = cx.context.new_function(
diff --git a/compiler/rustc_codegen_gcc/src/int.rs b/compiler/rustc_codegen_gcc/src/int.rs
index 841bcf592e489..e4c5eb9137317 100644
--- a/compiler/rustc_codegen_gcc/src/int.rs
+++ b/compiler/rustc_codegen_gcc/src/int.rs
@@ -2,8 +2,6 @@
 //! This module exists because some integer types are not supported on some gcc platforms, e.g.
 //! 128-bit integers on 32-bit platforms and thus require to be handled manually.
 
-use std::convert::TryFrom;
-
 use gccjit::{BinaryOp, ComparisonOp, FunctionType, Location, RValue, ToRValue, Type, UnaryOp};
 use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
 use rustc_codegen_ssa::traits::{BackendTypes, BaseTypeMethods, BuilderMethods, OverflowOp};
@@ -40,7 +38,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             self.cx.context.new_unary_op(self.location, operation, typ, a)
         } else {
             let element_type = typ.dyncast_array().expect("element type");
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 typ,
                 self.cx.context.new_unary_op(
                     self.location,
@@ -83,7 +81,19 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 let b = self.context.new_cast(self.location, b, a_type);
                 a >> b
             } else {
-                a >> b
+                let a_size = a_type.get_size();
+                let b_size = b_type.get_size();
+                match a_size.cmp(&b_size) {
+                    std::cmp::Ordering::Less => {
+                        let a = self.context.new_cast(self.location, a, b_type);
+                        a >> b
+                    }
+                    std::cmp::Ordering::Equal => a >> b,
+                    std::cmp::Ordering::Greater => {
+                        let b = self.context.new_cast(self.location, b, a_type);
+                        a >> b
+                    }
+                }
             }
         } else if a_type.is_vector() && a_type.is_vector() {
             a >> b
@@ -114,7 +124,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             let shift_value = self.gcc_sub(b, sixty_four);
             let high = self.high(a);
             let sign = if a_type.is_signed(self) { high >> sixty_three } else { zero };
-            let array_value = self.from_low_high_rvalues(a_type, high >> shift_value, sign);
+            let array_value = self.concat_low_high_rvalues(a_type, high >> shift_value, sign);
             then_block.add_assignment(self.location, result, array_value);
             then_block.end_with_jump(self.location, after_block);
 
@@ -126,12 +136,15 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             let shift_value = self.gcc_sub(sixty_four, b);
             // NOTE: cast low to its unsigned type in order to perform a logical right shift.
-            let unsigned_type = native_int_type.to_unsigned(&self.cx);
+            let unsigned_type = native_int_type.to_unsigned(self.cx);
             let casted_low = self.context.new_cast(self.location, self.low(a), unsigned_type);
             let shifted_low = casted_low >> self.context.new_cast(self.location, b, unsigned_type);
             let shifted_low = self.context.new_cast(self.location, shifted_low, native_int_type);
-            let array_value =
-                self.from_low_high_rvalues(a_type, (high << shift_value) | shifted_low, high >> b);
+            let array_value = self.concat_low_high_rvalues(
+                a_type,
+                (high << shift_value) | shifted_low,
+                high >> b,
+            );
             actual_else_block.add_assignment(self.location, result, array_value);
             actual_else_block.end_with_jump(self.location, after_block);
 
@@ -255,10 +268,10 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
     ) -> (<Self as BackendTypes>::Value, <Self as BackendTypes>::Value) {
         use rustc_middle::ty::{Int, IntTy::*, Uint, UintTy::*};
 
-        let new_kind = match typ.kind() {
+        let new_kind = match *typ.kind() {
             Int(t @ Isize) => Int(t.normalize(self.tcx.sess.target.pointer_width)),
             Uint(t @ Usize) => Uint(t.normalize(self.tcx.sess.target.pointer_width)),
-            t @ (Uint(_) | Int(_)) => t.clone(),
+            t @ (Uint(_) | Int(_)) => t,
             _ => panic!("tried to get overflow intrinsic for op applied to non-int type"),
         };
 
@@ -344,7 +357,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             }
         };
 
-        let intrinsic = self.context.get_builtin_function(&name);
+        let intrinsic = self.context.get_builtin_function(name);
         let res = self
             .current_func()
             // TODO(antoyo): is it correct to use rhs type instead of the parameter typ?
@@ -454,7 +467,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             let native_int_type = a_type.dyncast_array().expect("get element type");
             // NOTE: cast low to its unsigned type in order to perform a comparison correctly (e.g.
             // the sign is only on high).
-            let unsigned_type = native_int_type.to_unsigned(&self.cx);
+            let unsigned_type = native_int_type.to_unsigned(self.cx);
 
             let lhs_low = self.context.new_cast(self.location, self.low(lhs), unsigned_type);
             let rhs_low = self.context.new_cast(self.location, self.low(rhs), unsigned_type);
@@ -589,7 +602,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 | IntPredicate::IntULT
                 | IntPredicate::IntULE => {
                     if !a_type.is_vector() {
-                        let unsigned_type = a_type.to_unsigned(&self.cx);
+                        let unsigned_type = a_type.to_unsigned(self.cx);
                         lhs = self.context.new_cast(self.location, lhs, unsigned_type);
                         rhs = self.context.new_cast(self.location, rhs, unsigned_type);
                     }
@@ -612,7 +625,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         {
             a ^ b
         } else {
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 a_type,
                 self.low(a) ^ self.low(b),
                 self.high(a) ^ self.high(b),
@@ -635,7 +648,19 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 let b = self.context.new_cast(self.location, b, a_type);
                 a << b
             } else {
-                a << b
+                let a_size = a_type.get_size();
+                let b_size = b_type.get_size();
+                match a_size.cmp(&b_size) {
+                    std::cmp::Ordering::Less => {
+                        let a = self.context.new_cast(self.location, a, b_type);
+                        a << b
+                    }
+                    std::cmp::Ordering::Equal => a << b,
+                    std::cmp::Ordering::Greater => {
+                        let b = self.context.new_cast(self.location, b, a_type);
+                        a << b
+                    }
+                }
             }
         } else if a_type.is_vector() && a_type.is_vector() {
             a << b
@@ -661,7 +686,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             self.llbb().end_with_conditional(self.location, condition, then_block, else_block);
 
             let array_value =
-                self.from_low_high_rvalues(a_type, zero, self.low(a) << (b - sixty_four));
+                self.concat_low_high_rvalues(a_type, zero, self.low(a) << (b - sixty_four));
             then_block.add_assignment(self.location, result, array_value);
             then_block.end_with_jump(self.location, after_block);
 
@@ -673,13 +698,13 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             // NOTE: cast low to its unsigned type in order to perform a logical right shift.
             // TODO(antoyo): adjust this ^ comment.
-            let unsigned_type = native_int_type.to_unsigned(&self.cx);
+            let unsigned_type = native_int_type.to_unsigned(self.cx);
             let casted_low = self.context.new_cast(self.location, self.low(a), unsigned_type);
             let shift_value = self.context.new_cast(self.location, sixty_four - b, unsigned_type);
             let high_low =
                 self.context.new_cast(self.location, casted_low >> shift_value, native_int_type);
 
-            let array_value = self.from_low_high_rvalues(
+            let array_value = self.concat_low_high_rvalues(
                 a_type,
                 self.low(a) << b,
                 (self.high(a) << b) | high_low,
@@ -708,7 +733,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             // NOTE: we also need to swap the two elements here, in addition to swapping inside
             // the elements themselves like done above.
-            return self.from_low_high_rvalues(arg_type, swapped_msb, swapped_lsb);
+            return self.concat_low_high_rvalues(arg_type, swapped_msb, swapped_lsb);
         }
 
         // TODO(antoyo): check if it's faster to use string literals and a
@@ -727,10 +752,10 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     pub fn gcc_int(&self, typ: Type<'gcc>, int: i64) -> RValue<'gcc> {
         if self.is_native_int_type_or_bool(typ) {
-            self.context.new_rvalue_from_long(typ, i64::try_from(int).expect("i64::try_from"))
+            self.context.new_rvalue_from_long(typ, int)
         } else {
             // NOTE: set the sign in high.
-            self.from_low_high(typ, int, -(int.is_negative() as i64))
+            self.concat_low_high(typ, int, -(int.is_negative() as i64))
         }
     }
 
@@ -740,10 +765,9 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             let num = self.context.new_rvalue_from_long(self.u64_type, int as i64);
             self.gcc_int_cast(num, typ)
         } else if self.is_native_int_type_or_bool(typ) {
-            self.context
-                .new_rvalue_from_long(typ, u64::try_from(int).expect("u64::try_from") as i64)
+            self.context.new_rvalue_from_long(typ, int as i64)
         } else {
-            self.from_low_high(typ, int as i64, 0)
+            self.concat_low_high(typ, int as i64, 0)
         }
     }
 
@@ -760,7 +784,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
                 let shift = high << sixty_four;
                 shift | self.context.new_cast(None, low, typ)
             } else {
-                self.from_low_high(typ, low as i64, high as i64)
+                self.concat_low_high(typ, low as i64, high as i64)
             }
         } else if typ.is_i128(self) {
             // FIXME(antoyo): libgccjit cannot create 128-bit values yet.
@@ -775,7 +799,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         if self.is_native_int_type_or_bool(typ) {
             self.context.new_rvalue_zero(typ)
         } else {
-            self.from_low_high(typ, 0, 0)
+            self.concat_low_high(typ, 0, 0)
         }
     }
 
@@ -813,7 +837,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
                 "both types should either be native or non-native for or operation"
             );
             let native_int_type = a_type.dyncast_array().expect("get element type");
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 a_type,
                 self.context.new_binary_op(
                     loc,
@@ -858,7 +882,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             let is_negative =
                 self.context.new_comparison(None, ComparisonOp::LessThan, value, zero);
             let is_negative = self.gcc_int_cast(is_negative, dest_element_type);
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 dest_typ,
                 self.context.new_cast(None, value, dest_element_type),
                 self.context.new_unary_op(None, UnaryOp::Minus, dest_element_type, is_negative),
@@ -926,7 +950,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             return self.context.new_cast(None, value, dest_typ);
         }
 
-        debug_assert!(value_type.dyncast_array().is_some());
+        debug_assert!(dest_typ.dyncast_array().is_some());
         let name_suffix = match self.type_kind(value_type) {
             TypeKind::Float => "sfti",
             TypeKind::Double => "dfti",
@@ -978,7 +1002,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             .to_rvalue()
     }
 
-    fn from_low_high_rvalues(
+    fn concat_low_high_rvalues(
         &self,
         typ: Type<'gcc>,
         low: RValue<'gcc>,
@@ -993,7 +1017,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         self.context.new_array_constructor(None, typ, &values)
     }
 
-    fn from_low_high(&self, typ: Type<'gcc>, low: i64, high: i64) -> RValue<'gcc> {
+    fn concat_low_high(&self, typ: Type<'gcc>, low: i64, high: i64) -> RValue<'gcc> {
         let (first, last) = match self.sess().target.options.endian {
             Endian::Little => (low, high),
             Endian::Big => (high, low),
diff --git a/compiler/rustc_codegen_gcc/src/intrinsic/archs.rs b/compiler/rustc_codegen_gcc/src/intrinsic/archs.rs
index c4ae1751fa05a..f750093378989 100644
--- a/compiler/rustc_codegen_gcc/src/intrinsic/archs.rs
+++ b/compiler/rustc_codegen_gcc/src/intrinsic/archs.rs
@@ -74,6 +74,10 @@ match name {
     "llvm.amdgcn.cvt.sr.bf8.f32" => "__builtin_amdgcn_cvt_sr_bf8_f32",
     "llvm.amdgcn.cvt.sr.fp8.f32" => "__builtin_amdgcn_cvt_sr_fp8_f32",
     "llvm.amdgcn.dispatch.id" => "__builtin_amdgcn_dispatch_id",
+    "llvm.amdgcn.dot4.f32.bf8.bf8" => "__builtin_amdgcn_dot4_f32_bf8_bf8",
+    "llvm.amdgcn.dot4.f32.bf8.fp8" => "__builtin_amdgcn_dot4_f32_bf8_fp8",
+    "llvm.amdgcn.dot4.f32.fp8.bf8" => "__builtin_amdgcn_dot4_f32_fp8_bf8",
+    "llvm.amdgcn.dot4.f32.fp8.fp8" => "__builtin_amdgcn_dot4_f32_fp8_fp8",
     "llvm.amdgcn.ds.add.gs.reg.rtn" => "__builtin_amdgcn_ds_add_gs_reg_rtn",
     "llvm.amdgcn.ds.bpermute" => "__builtin_amdgcn_ds_bpermute",
     "llvm.amdgcn.ds.fadd.v2bf16" => "__builtin_amdgcn_ds_atomic_fadd_v2bf16",
@@ -2291,6 +2295,10 @@ match name {
     "llvm.loongarch.csrxchg.d" => "__builtin_loongarch_csrxchg_d",
     "llvm.loongarch.csrxchg.w" => "__builtin_loongarch_csrxchg_w",
     "llvm.loongarch.dbar" => "__builtin_loongarch_dbar",
+    "llvm.loongarch.frecipe.d" => "__builtin_loongarch_frecipe_d",
+    "llvm.loongarch.frecipe.s" => "__builtin_loongarch_frecipe_s",
+    "llvm.loongarch.frsqrte.d" => "__builtin_loongarch_frsqrte_d",
+    "llvm.loongarch.frsqrte.s" => "__builtin_loongarch_frsqrte_s",
     "llvm.loongarch.ibar" => "__builtin_loongarch_ibar",
     "llvm.loongarch.iocsrrd.b" => "__builtin_loongarch_iocsrrd_b",
     "llvm.loongarch.iocsrrd.d" => "__builtin_loongarch_iocsrrd_d",
@@ -2529,6 +2537,8 @@ match name {
     "llvm.loongarch.lasx.xvfnmsub.s" => "__builtin_lasx_xvfnmsub_s",
     "llvm.loongarch.lasx.xvfrecip.d" => "__builtin_lasx_xvfrecip_d",
     "llvm.loongarch.lasx.xvfrecip.s" => "__builtin_lasx_xvfrecip_s",
+    "llvm.loongarch.lasx.xvfrecipe.d" => "__builtin_lasx_xvfrecipe_d",
+    "llvm.loongarch.lasx.xvfrecipe.s" => "__builtin_lasx_xvfrecipe_s",
     "llvm.loongarch.lasx.xvfrint.d" => "__builtin_lasx_xvfrint_d",
     "llvm.loongarch.lasx.xvfrint.s" => "__builtin_lasx_xvfrint_s",
     "llvm.loongarch.lasx.xvfrintrm.d" => "__builtin_lasx_xvfrintrm_d",
@@ -2541,6 +2551,8 @@ match name {
     "llvm.loongarch.lasx.xvfrintrz.s" => "__builtin_lasx_xvfrintrz_s",
     "llvm.loongarch.lasx.xvfrsqrt.d" => "__builtin_lasx_xvfrsqrt_d",
     "llvm.loongarch.lasx.xvfrsqrt.s" => "__builtin_lasx_xvfrsqrt_s",
+    "llvm.loongarch.lasx.xvfrsqrte.d" => "__builtin_lasx_xvfrsqrte_d",
+    "llvm.loongarch.lasx.xvfrsqrte.s" => "__builtin_lasx_xvfrsqrte_s",
     "llvm.loongarch.lasx.xvfrstp.b" => "__builtin_lasx_xvfrstp_b",
     "llvm.loongarch.lasx.xvfrstp.h" => "__builtin_lasx_xvfrstp_h",
     "llvm.loongarch.lasx.xvfrstpi.b" => "__builtin_lasx_xvfrstpi_b",
@@ -3255,6 +3267,8 @@ match name {
     "llvm.loongarch.lsx.vfnmsub.s" => "__builtin_lsx_vfnmsub_s",
     "llvm.loongarch.lsx.vfrecip.d" => "__builtin_lsx_vfrecip_d",
     "llvm.loongarch.lsx.vfrecip.s" => "__builtin_lsx_vfrecip_s",
+    "llvm.loongarch.lsx.vfrecipe.d" => "__builtin_lsx_vfrecipe_d",
+    "llvm.loongarch.lsx.vfrecipe.s" => "__builtin_lsx_vfrecipe_s",
     "llvm.loongarch.lsx.vfrint.d" => "__builtin_lsx_vfrint_d",
     "llvm.loongarch.lsx.vfrint.s" => "__builtin_lsx_vfrint_s",
     "llvm.loongarch.lsx.vfrintrm.d" => "__builtin_lsx_vfrintrm_d",
@@ -3267,6 +3281,8 @@ match name {
     "llvm.loongarch.lsx.vfrintrz.s" => "__builtin_lsx_vfrintrz_s",
     "llvm.loongarch.lsx.vfrsqrt.d" => "__builtin_lsx_vfrsqrt_d",
     "llvm.loongarch.lsx.vfrsqrt.s" => "__builtin_lsx_vfrsqrt_s",
+    "llvm.loongarch.lsx.vfrsqrte.d" => "__builtin_lsx_vfrsqrte_d",
+    "llvm.loongarch.lsx.vfrsqrte.s" => "__builtin_lsx_vfrsqrte_s",
     "llvm.loongarch.lsx.vfrstp.b" => "__builtin_lsx_vfrstp_b",
     "llvm.loongarch.lsx.vfrstp.h" => "__builtin_lsx_vfrstp_h",
     "llvm.loongarch.lsx.vfrstpi.b" => "__builtin_lsx_vfrstpi_b",
@@ -4434,6 +4450,7 @@ match name {
     "llvm.nvvm.abs.bf16x2" => "__nvvm_abs_bf16x2",
     "llvm.nvvm.abs.i" => "__nvvm_abs_i",
     "llvm.nvvm.abs.ll" => "__nvvm_abs_ll",
+    "llvm.nvvm.activemask" => "__nvvm_activemask",
     "llvm.nvvm.add.rm.d" => "__nvvm_add_rm_d",
     "llvm.nvvm.add.rm.f" => "__nvvm_add_rm_f",
     "llvm.nvvm.add.rm.ftz.f" => "__nvvm_add_rm_ftz_f",
@@ -4522,6 +4539,7 @@ match name {
     "llvm.nvvm.ex2.approx.d" => "__nvvm_ex2_approx_d",
     "llvm.nvvm.ex2.approx.f" => "__nvvm_ex2_approx_f",
     "llvm.nvvm.ex2.approx.ftz.f" => "__nvvm_ex2_approx_ftz_f",
+    "llvm.nvvm.exit" => "__nvvm_exit",
     "llvm.nvvm.f2bf16.rn" => "__nvvm_f2bf16_rn",
     "llvm.nvvm.f2bf16.rn.relu" => "__nvvm_f2bf16_rn_relu",
     "llvm.nvvm.f2bf16.rz" => "__nvvm_f2bf16_rz",
@@ -4722,8 +4740,11 @@ match name {
     "llvm.nvvm.mul24.ui" => "__nvvm_mul24_ui",
     "llvm.nvvm.mulhi.i" => "__nvvm_mulhi_i",
     "llvm.nvvm.mulhi.ll" => "__nvvm_mulhi_ll",
+    "llvm.nvvm.mulhi.s" => "__nvvm_mulhi_s",
     "llvm.nvvm.mulhi.ui" => "__nvvm_mulhi_ui",
     "llvm.nvvm.mulhi.ull" => "__nvvm_mulhi_ull",
+    "llvm.nvvm.mulhi.us" => "__nvvm_mulhi_us",
+    "llvm.nvvm.nanosleep" => "__nvvm_nanosleep",
     "llvm.nvvm.neg.bf16" => "__nvvm_neg_bf16",
     "llvm.nvvm.neg.bf16x2" => "__nvvm_neg_bf16x2",
     "llvm.nvvm.popc.i" => "__nvvm_popc_i",
@@ -4783,6 +4804,7 @@ match name {
     "llvm.nvvm.read.ptx.sreg.envreg7" => "__nvvm_read_ptx_sreg_envreg7",
     "llvm.nvvm.read.ptx.sreg.envreg8" => "__nvvm_read_ptx_sreg_envreg8",
     "llvm.nvvm.read.ptx.sreg.envreg9" => "__nvvm_read_ptx_sreg_envreg9",
+    "llvm.nvvm.read.ptx.sreg.globaltimer" => "__nvvm_read_ptx_sreg_globaltimer",
     "llvm.nvvm.read.ptx.sreg.gridid" => "__nvvm_read_ptx_sreg_gridid",
     // [DUPLICATE]: "llvm.nvvm.read.ptx.sreg.gridid" => "__nvvm_read_ptx_sreg_",
     "llvm.nvvm.read.ptx.sreg.laneid" => "__nvvm_read_ptx_sreg_laneid",
@@ -4835,6 +4857,7 @@ match name {
     "llvm.nvvm.redux.sync.umax" => "__nvvm_redux_sync_umax",
     "llvm.nvvm.redux.sync.umin" => "__nvvm_redux_sync_umin",
     "llvm.nvvm.redux.sync.xor" => "__nvvm_redux_sync_xor",
+    "llvm.nvvm.reflect" => "__nvvm_reflect",
     "llvm.nvvm.rotate.b32" => "__nvvm_rotate_b32",
     "llvm.nvvm.rotate.b64" => "__nvvm_rotate_b64",
     "llvm.nvvm.rotate.right.b64" => "__nvvm_rotate_right_b64",
@@ -4845,7 +4868,11 @@ match name {
     "llvm.nvvm.rsqrt.approx.f" => "__nvvm_rsqrt_approx_f",
     "llvm.nvvm.rsqrt.approx.ftz.f" => "__nvvm_rsqrt_approx_ftz_f",
     "llvm.nvvm.sad.i" => "__nvvm_sad_i",
+    "llvm.nvvm.sad.ll" => "__nvvm_sad_ll",
+    "llvm.nvvm.sad.s" => "__nvvm_sad_s",
     "llvm.nvvm.sad.ui" => "__nvvm_sad_ui",
+    "llvm.nvvm.sad.ull" => "__nvvm_sad_ull",
+    "llvm.nvvm.sad.us" => "__nvvm_sad_us",
     "llvm.nvvm.saturate.d" => "__nvvm_saturate_d",
     "llvm.nvvm.saturate.f" => "__nvvm_saturate_f",
     "llvm.nvvm.saturate.ftz.f" => "__nvvm_saturate_ftz_f",
@@ -5471,6 +5498,7 @@ match name {
     "llvm.ppc.fctiwz" => "__builtin_ppc_fctiwz",
     "llvm.ppc.fctudz" => "__builtin_ppc_fctudz",
     "llvm.ppc.fctuwz" => "__builtin_ppc_fctuwz",
+    "llvm.ppc.fence" => "__builtin_ppc_fence",
     "llvm.ppc.fmaf128.round.to.odd" => "__builtin_fmaf128_round_to_odd",
     "llvm.ppc.fmsub" => "__builtin_ppc_fmsub",
     "llvm.ppc.fmsubs" => "__builtin_ppc_fmsubs",
@@ -5599,6 +5627,9 @@ match name {
     "llvm.ppc.qpx.qvstfs" => "__builtin_qpx_qvstfs",
     "llvm.ppc.qpx.qvstfsa" => "__builtin_qpx_qvstfsa",
     "llvm.ppc.readflm" => "__builtin_readflm",
+    "llvm.ppc.rldimi" => "__builtin_ppc_rldimi",
+    "llvm.ppc.rlwimi" => "__builtin_ppc_rlwimi",
+    "llvm.ppc.rlwnm" => "__builtin_ppc_rlwnm",
     "llvm.ppc.scalar.extract.expq" => "__builtin_vsx_scalar_extract_expq",
     "llvm.ppc.scalar.insert.exp.qp" => "__builtin_vsx_scalar_insert_exp_qp",
     "llvm.ppc.set.texasr" => "__builtin_set_texasr",
@@ -5912,6 +5943,8 @@ match name {
     "llvm.s390.vupllb" => "__builtin_s390_vupllb",
     "llvm.s390.vupllf" => "__builtin_s390_vupllf",
     "llvm.s390.vupllh" => "__builtin_s390_vupllh",
+    // spv
+    "llvm.spv.create.handle" => "__builtin_hlsl_create_handle",
     // ve
     "llvm.ve.vl.andm.MMM" => "__builtin_ve_vl_andm_MMM",
     "llvm.ve.vl.andm.mmm" => "__builtin_ve_vl_andm_mmm",
diff --git a/compiler/rustc_codegen_gcc/src/intrinsic/llvm.rs b/compiler/rustc_codegen_gcc/src/intrinsic/llvm.rs
index ce8dee69a9886..a127048221901 100644
--- a/compiler/rustc_codegen_gcc/src/intrinsic/llvm.rs
+++ b/compiler/rustc_codegen_gcc/src/intrinsic/llvm.rs
@@ -15,7 +15,7 @@ pub fn adjust_intrinsic_arguments<'a, 'b, 'gcc, 'tcx>(
     // Some LLVM intrinsics do not map 1-to-1 to GCC intrinsics, so we add the missing
     // arguments here.
     if gcc_func.get_param_count() != args.len() {
-        match &*func_name {
+        match func_name {
             // NOTE: the following intrinsics have a different number of parameters in LLVM and GCC.
             "__builtin_ia32_prold512_mask"
             | "__builtin_ia32_pmuldq512_mask"
@@ -380,7 +380,7 @@ pub fn adjust_intrinsic_arguments<'a, 'b, 'gcc, 'tcx>(
             _ => (),
         }
     } else {
-        match &*func_name {
+        match func_name {
             "__builtin_ia32_rndscaless_mask_round" | "__builtin_ia32_rndscalesd_mask_round" => {
                 let new_args = args.to_vec();
                 let arg3_type = gcc_func.get_param_type(2);
@@ -629,17 +629,22 @@ pub fn intrinsic<'gcc, 'tcx>(name: &str, cx: &CodegenCx<'gcc, 'tcx>) -> Function
 
 #[cfg(feature = "master")]
 pub fn intrinsic<'gcc, 'tcx>(name: &str, cx: &CodegenCx<'gcc, 'tcx>) -> Function<'gcc> {
-    match name {
+    let gcc_name = match name {
         "llvm.prefetch" => {
             let gcc_name = "__builtin_prefetch";
             let func = cx.context.get_builtin_function(gcc_name);
             cx.functions.borrow_mut().insert(gcc_name.to_string(), func);
             return func;
         }
-        _ => (),
-    }
 
-    let gcc_name = match name {
+        "llvm.aarch64.isb" => {
+            // FIXME: GCC doesn't support __builtin_arm_isb yet, check if this builtin is OK.
+            let gcc_name = "__atomic_thread_fence";
+            let func = cx.context.get_builtin_function(gcc_name);
+            cx.functions.borrow_mut().insert(gcc_name.to_string(), func);
+            return func;
+        }
+
         "llvm.x86.xgetbv" => "__builtin_ia32_xgetbv",
         // NOTE: this doc specifies the equivalent GCC builtins: http://huonw.github.io/llvmint/llvmint/x86/index.html
         "llvm.sqrt.v2f64" => "__builtin_ia32_sqrtpd",
diff --git a/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs b/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs
index 43f12b514affa..9352a67e362fb 100644
--- a/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs
+++ b/compiler/rustc_codegen_gcc/src/intrinsic/mod.rs
@@ -91,7 +91,7 @@ fn get_simple_intrinsic<'gcc, 'tcx>(
         sym::abort => "abort",
         _ => return None,
     };
-    Some(cx.context.get_builtin_function(&gcc_name))
+    Some(cx.context.get_builtin_function(gcc_name))
 }
 
 impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
@@ -122,10 +122,17 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         let result = PlaceRef::new_sized(llresult, fn_abi.ret.layout);
 
         let simple = get_simple_intrinsic(self, name);
+
+        // FIXME(tempdragon): Re-enable `clippy::suspicious_else_formatting` if the following issue is solved:
+        // https://github.com/rust-lang/rust-clippy/issues/12497
+        // and leave `else if use_integer_compare` to be placed "as is".
+        #[allow(clippy::suspicious_else_formatting)]
         let llval = match name {
             _ if simple.is_some() => {
                 // FIXME(antoyo): remove this cast when the API supports function.
-                let func = unsafe { std::mem::transmute(simple.expect("simple")) };
+                let func = unsafe {
+                    std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(simple.expect("simple"))
+                };
                 self.call(
                     self.type_void(),
                     None,
@@ -167,7 +174,7 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
             sym::volatile_load | sym::unaligned_volatile_load => {
                 let tp_ty = fn_args.type_at(0);
                 let ptr = args[0].immediate();
-                let load = if let PassMode::Cast { cast: ty, pad_i32: _ } = &fn_abi.ret.mode {
+                let load = if let PassMode::Cast { cast: ref ty, pad_i32: _ } = fn_abi.ret.mode {
                     let gcc_ty = ty.gcc_type(self);
                     self.volatile_load(gcc_ty, ptr)
                 } else {
@@ -213,12 +220,12 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
                             let after_block = func.new_block("after");
 
                             let arg = args[0].immediate();
-                            let result = func.new_local(None, arg.get_type(), "zeros");
+                            let result = func.new_local(None, self.u32_type, "zeros");
                             let zero = self.cx.gcc_zero(arg.get_type());
                             let cond = self.gcc_icmp(IntPredicate::IntEQ, arg, zero);
                             self.llbb().end_with_conditional(None, cond, then_block, else_block);
 
-                            let zero_result = self.cx.gcc_uint(arg.get_type(), width);
+                            let zero_result = self.cx.gcc_uint(self.u32_type, width);
                             then_block.add_assignment(None, result, zero_result);
                             then_block.end_with_jump(None, after_block);
 
@@ -386,7 +393,7 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         };
 
         if !fn_abi.ret.is_ignore() {
-            if let PassMode::Cast { cast: ty, .. } = &fn_abi.ret.mode {
+            if let PassMode::Cast { cast: ref ty, .. } = fn_abi.ret.mode {
                 let ptr_llty = self.type_ptr_to(ty.gcc_type(self));
                 let ptr = self.pointercast(result.val.llval, ptr_llty);
                 self.store(llval, ptr, result.val.align);
@@ -592,7 +599,7 @@ fn int_type_width_signed<'gcc, 'tcx>(
     ty: Ty<'tcx>,
     cx: &CodegenCx<'gcc, 'tcx>,
 ) -> Option<(u64, bool)> {
-    match ty.kind() {
+    match *ty.kind() {
         ty::Int(t) => Some((
             match t {
                 rustc_middle::ty::IntTy::Isize => u64::from(cx.tcx.sess.target.pointer_width),
@@ -698,16 +705,17 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
     fn count_leading_zeroes(&mut self, width: u64, arg: RValue<'gcc>) -> RValue<'gcc> {
         // TODO(antoyo): use width?
         let arg_type = arg.get_type();
+        let result_type = self.u32_type;
         let count_leading_zeroes =
             // TODO(antoyo): write a new function Type::is_compatible_with(&Type) and use it here
             // instead of using is_uint().
-            if arg_type.is_uint(&self.cx) {
+            if arg_type.is_uint(self.cx) {
                 "__builtin_clz"
             }
-            else if arg_type.is_ulong(&self.cx) {
+            else if arg_type.is_ulong(self.cx) {
                 "__builtin_clzl"
             }
-            else if arg_type.is_ulonglong(&self.cx) {
+            else if arg_type.is_ulonglong(self.cx) {
                 "__builtin_clzll"
             }
             else if width == 128 {
@@ -755,7 +763,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
                 let res = self.context.new_array_access(self.location, result, index);
 
-                return self.gcc_int_cast(res.to_rvalue(), arg_type);
+                return self.gcc_int_cast(res.to_rvalue(), result_type);
             }
             else {
                 let count_leading_zeroes = self.context.get_builtin_function("__builtin_clzll");
@@ -763,17 +771,18 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 let diff = self.ulonglong_type.get_size() as i64 - arg_type.get_size() as i64;
                 let diff = self.context.new_rvalue_from_long(self.int_type, diff * 8);
                 let res = self.context.new_call(self.location, count_leading_zeroes, &[arg]) - diff;
-                return self.context.new_cast(self.location, res, arg_type);
+                return self.context.new_cast(self.location, res, result_type);
             };
         let count_leading_zeroes = self.context.get_builtin_function(count_leading_zeroes);
         let res = self.context.new_call(self.location, count_leading_zeroes, &[arg]);
-        self.context.new_cast(self.location, res, arg_type)
+        self.context.new_cast(self.location, res, result_type)
     }
 
     fn count_trailing_zeroes(&mut self, _width: u64, arg: RValue<'gcc>) -> RValue<'gcc> {
-        let result_type = arg.get_type();
-        let arg = if result_type.is_signed(self.cx) {
-            let new_type = result_type.to_unsigned(self.cx);
+        let arg_type = arg.get_type();
+        let result_type = self.u32_type;
+        let arg = if arg_type.is_signed(self.cx) {
+            let new_type = arg_type.to_unsigned(self.cx);
             self.gcc_int_cast(arg, new_type)
         } else {
             arg
@@ -782,17 +791,17 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let (count_trailing_zeroes, expected_type) =
             // TODO(antoyo): write a new function Type::is_compatible_with(&Type) and use it here
             // instead of using is_uint().
-            if arg_type.is_uchar(&self.cx) || arg_type.is_ushort(&self.cx) || arg_type.is_uint(&self.cx) {
+            if arg_type.is_uchar(self.cx) || arg_type.is_ushort(self.cx) || arg_type.is_uint(self.cx) {
                 // NOTE: we don't need to & 0xFF for uchar because the result is undefined on zero.
                 ("__builtin_ctz", self.cx.uint_type)
             }
-            else if arg_type.is_ulong(&self.cx) {
+            else if arg_type.is_ulong(self.cx) {
                 ("__builtin_ctzl", self.cx.ulong_type)
             }
-            else if arg_type.is_ulonglong(&self.cx) {
+            else if arg_type.is_ulonglong(self.cx) {
                 ("__builtin_ctzll", self.cx.ulonglong_type)
             }
-            else if arg_type.is_u128(&self.cx) {
+            else if arg_type.is_u128(self.cx) {
                 // Adapted from the algorithm to count leading zeroes from: https://stackoverflow.com/a/28433850/389119
                 let array_type = self.context.new_array_type(None, arg_type, 3);
                 let result = self.current_func()
@@ -863,18 +872,16 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
     fn pop_count(&mut self, value: RValue<'gcc>) -> RValue<'gcc> {
         // TODO(antoyo): use the optimized version with fewer operations.
-        let result_type = value.get_type();
-        let value_type = result_type.to_unsigned(self.cx);
+        let result_type = self.u32_type;
+        let arg_type = value.get_type();
+        let value_type = arg_type.to_unsigned(self.cx);
 
-        let value = if result_type.is_signed(self.cx) {
-            self.gcc_int_cast(value, value_type)
-        } else {
-            value
-        };
+        let value =
+            if arg_type.is_signed(self.cx) { self.gcc_int_cast(value, value_type) } else { value };
 
         // only break apart 128-bit ints if they're not natively supported
         // TODO(antoyo): remove this if/when native 128-bit integers land in libgccjit
-        if value_type.is_u128(&self.cx) && !self.cx.supports_128bit_integers {
+        if value_type.is_u128(self.cx) && !self.cx.supports_128bit_integers {
             let sixty_four = self.gcc_int(value_type, 64);
             let right_shift = self.gcc_lshr(value, sixty_four);
             let high = self.gcc_int_cast(right_shift, self.cx.ulonglong_type);
@@ -997,7 +1004,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             // Return `result_type`'s maximum or minimum value on overflow
             // NOTE: convert the type to unsigned to have an unsigned shift.
-            let unsigned_type = result_type.to_unsigned(&self.cx);
+            let unsigned_type = result_type.to_unsigned(self.cx);
             let shifted = self.gcc_lshr(
                 self.gcc_int_cast(lhs, unsigned_type),
                 self.gcc_int(unsigned_type, width as i64 - 1),
@@ -1189,7 +1196,7 @@ fn codegen_gnu_try<'gcc>(
         bx.invoke(try_func_ty, None, None, try_func, &[data], then, catch, None, None);
     });
 
-    let func = unsafe { std::mem::transmute(func) };
+    let func = unsafe { std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(func) };
 
     // Note that no invoke is used here because by definition this function
     // can't panic (that's what it's catching).
@@ -1263,7 +1270,7 @@ fn gen_fn<'a, 'gcc, 'tcx>(
     // FIXME(eddyb) find a nicer way to do this.
     cx.linkage.set(FunctionType::Internal);
     let func = cx.declare_fn(name, fn_abi);
-    let func_val = unsafe { std::mem::transmute(func) };
+    let func_val = unsafe { std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(func) };
     cx.set_frame_pointer_type(func_val);
     cx.apply_target_cpu_attr(func_val);
     let block = Builder::append_block(cx, func_val, "entry-block");
diff --git a/compiler/rustc_codegen_gcc/src/intrinsic/simd.rs b/compiler/rustc_codegen_gcc/src/intrinsic/simd.rs
index 1625e6ecdb701..ba214a9c24cff 100644
--- a/compiler/rustc_codegen_gcc/src/intrinsic/simd.rs
+++ b/compiler/rustc_codegen_gcc/src/intrinsic/simd.rs
@@ -13,6 +13,7 @@ use rustc_codegen_ssa::errors::InvalidMonomorphization;
 use rustc_codegen_ssa::mir::operand::OperandRef;
 use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::{BaseTypeMethods, BuilderMethods};
+#[cfg(feature = "master")]
 use rustc_hir as hir;
 use rustc_middle::mir::BinOp;
 use rustc_middle::span_bug;
@@ -72,11 +73,11 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         let expected_bytes = len / 8 + ((len % 8 > 0) as u64);
 
         let mask_ty = arg_tys[0];
-        let mut mask = match mask_ty.kind() {
+        let mut mask = match *mask_ty.kind() {
             ty::Int(i) if i.bit_width() == Some(expected_int_bits) => args[0].immediate(),
             ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => args[0].immediate(),
             ty::Array(elem, len)
-                if matches!(elem.kind(), ty::Uint(ty::UintTy::U8))
+                if matches!(*elem.kind(), ty::Uint(ty::UintTy::U8))
                     && len.try_eval_target_usize(bx.tcx, ty::ParamEnv::reveal_all())
                         == Some(expected_bytes) =>
             {
@@ -309,10 +310,9 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                 })
                 .collect();
             return Ok(bx.context.new_rvalue_from_vector(None, v_type, &elems));
-        } else {
-            // avoid the unnecessary truncation as an optimization.
-            return Ok(bx.context.new_bitcast(None, result, v_type));
         }
+        // avoid the unnecessary truncation as an optimization.
+        return Ok(bx.context.new_bitcast(None, result, v_type));
     }
     // since gcc doesn't have vector shuffle methods available in non-patched builds, fallback to
     // component-wise bitreverses if they're not available.
@@ -342,11 +342,13 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             .map(|i| {
                 let index = bx.context.new_rvalue_from_long(bx.i32_type, i as i64);
                 let value = bx.extract_element(vector, index).to_rvalue();
-                if name == sym::simd_ctlz {
-                    bx.count_leading_zeroes(value.get_type().get_size() as u64 * 8, value)
+                let value_type = value.get_type();
+                let element = if name == sym::simd_ctlz {
+                    bx.count_leading_zeroes(value_type.get_size() as u64 * 8, value)
                 } else {
-                    bx.count_trailing_zeroes(value.get_type().get_size() as u64 * 8, value)
-                }
+                    bx.count_trailing_zeroes(value_type.get_size() as u64 * 8, value)
+                };
+                bx.context.new_cast(None, element, value_type)
             })
             .collect();
         return Ok(bx.context.new_rvalue_from_vector(None, vector.get_type(), &elements));
@@ -355,8 +357,8 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
     if name == sym::simd_shuffle {
         // Make sure this is actually an array, since typeck only checks the length-suffixed
         // version of this intrinsic.
-        let n: u64 = match args[2].layout.ty.kind() {
-            ty::Array(ty, len) if matches!(ty.kind(), ty::Uint(ty::UintTy::U32)) => {
+        let n: u64 = match *args[2].layout.ty.kind() {
+            ty::Array(ty, len) if matches!(*ty.kind(), ty::Uint(ty::UintTy::U32)) => {
                 len.try_eval_target_usize(bx.cx.tcx, ty::ParamEnv::reveal_all()).unwrap_or_else(
                     || span_bug!(span, "could not evaluate shuffle index array length"),
                 )
@@ -429,13 +431,148 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             m_len == v_len,
             InvalidMonomorphization::MismatchedLengths { span, name, m_len, v_len }
         );
-        match m_elem_ty.kind() {
+        match *m_elem_ty.kind() {
             ty::Int(_) => {}
             _ => return_error!(InvalidMonomorphization::MaskType { span, name, ty: m_elem_ty }),
         }
         return Ok(bx.vector_select(args[0].immediate(), args[1].immediate(), args[2].immediate()));
     }
 
+    if name == sym::simd_cast_ptr {
+        require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
+        let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
+
+        require!(
+            in_len == out_len,
+            InvalidMonomorphization::ReturnLengthInputType {
+                span,
+                name,
+                in_len,
+                in_ty,
+                ret_ty,
+                out_len
+            }
+        );
+
+        match *in_elem.kind() {
+            ty::RawPtr(p_ty, _) => {
+                let metadata = p_ty.ptr_metadata_ty(bx.tcx, |ty| {
+                    bx.tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), ty)
+                });
+                require!(
+                    metadata.is_unit(),
+                    InvalidMonomorphization::CastFatPointer { span, name, ty: in_elem }
+                );
+            }
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: in_elem })
+            }
+        }
+        match *out_elem.kind() {
+            ty::RawPtr(p_ty, _) => {
+                let metadata = p_ty.ptr_metadata_ty(bx.tcx, |ty| {
+                    bx.tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), ty)
+                });
+                require!(
+                    metadata.is_unit(),
+                    InvalidMonomorphization::CastFatPointer { span, name, ty: out_elem }
+                );
+            }
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: out_elem })
+            }
+        }
+
+        let arg = args[0].immediate();
+        let elem_type = llret_ty.dyncast_vector().expect("vector return type").get_element_type();
+        let values: Vec<_> = (0..in_len)
+            .map(|i| {
+                let idx = bx.gcc_int(bx.usize_type, i as _);
+                let value = bx.extract_element(arg, idx);
+                bx.pointercast(value, elem_type)
+            })
+            .collect();
+        return Ok(bx.context.new_rvalue_from_vector(bx.location, llret_ty, &values));
+    }
+
+    if name == sym::simd_expose_provenance {
+        require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
+        let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
+
+        require!(
+            in_len == out_len,
+            InvalidMonomorphization::ReturnLengthInputType {
+                span,
+                name,
+                in_len,
+                in_ty,
+                ret_ty,
+                out_len
+            }
+        );
+
+        match *in_elem.kind() {
+            ty::RawPtr(_, _) => {}
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: in_elem })
+            }
+        }
+        match *out_elem.kind() {
+            ty::Uint(ty::UintTy::Usize) => {}
+            _ => return_error!(InvalidMonomorphization::ExpectedUsize { span, name, ty: out_elem }),
+        }
+
+        let arg = args[0].immediate();
+        let elem_type = llret_ty.dyncast_vector().expect("vector return type").get_element_type();
+        let values: Vec<_> = (0..in_len)
+            .map(|i| {
+                let idx = bx.gcc_int(bx.usize_type, i as _);
+                let value = bx.extract_element(arg, idx);
+                bx.ptrtoint(value, elem_type)
+            })
+            .collect();
+        return Ok(bx.context.new_rvalue_from_vector(bx.location, llret_ty, &values));
+    }
+
+    if name == sym::simd_with_exposed_provenance {
+        require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
+        let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
+
+        require!(
+            in_len == out_len,
+            InvalidMonomorphization::ReturnLengthInputType {
+                span,
+                name,
+                in_len,
+                in_ty,
+                ret_ty,
+                out_len
+            }
+        );
+
+        match *in_elem.kind() {
+            ty::Uint(ty::UintTy::Usize) => {}
+            _ => return_error!(InvalidMonomorphization::ExpectedUsize { span, name, ty: in_elem }),
+        }
+        match *out_elem.kind() {
+            ty::RawPtr(_, _) => {}
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: out_elem })
+            }
+        }
+
+        let arg = args[0].immediate();
+        let elem_type = llret_ty.dyncast_vector().expect("vector return type").get_element_type();
+        let values: Vec<_> = (0..in_len)
+            .map(|i| {
+                let idx = bx.gcc_int(bx.usize_type, i as _);
+                let value = bx.extract_element(arg, idx);
+                bx.inttoptr(value, elem_type)
+            })
+            .collect();
+        return Ok(bx.context.new_rvalue_from_vector(bx.location, llret_ty, &values));
+    }
+
     #[cfg(feature = "master")]
     if name == sym::simd_cast || name == sym::simd_as {
         require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
@@ -462,13 +599,13 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             Unsupported,
         }
 
-        let in_style = match in_elem.kind() {
+        let in_style = match *in_elem.kind() {
             ty::Int(_) | ty::Uint(_) => Style::Int,
             ty::Float(_) => Style::Float,
             _ => Style::Unsupported,
         };
 
-        let out_style = match out_elem.kind() {
+        let out_style = match *out_elem.kind() {
             ty::Int(_) | ty::Uint(_) => Style::Int,
             ty::Float(_) => Style::Float,
             _ => Style::Unsupported,
@@ -495,7 +632,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
     macro_rules! arith_binary {
         ($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
             $(if name == sym::$name {
-                match in_elem.kind() {
+                match *in_elem.kind() {
                     $($(ty::$p(_))|* => {
                         return Ok(bx.$call(args[0].immediate(), args[1].immediate()))
                     })*
@@ -533,7 +670,6 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         let sign_shift = bx.context.new_rvalue_from_int(elem_type, elem_size as i32 - 1);
         let one = bx.context.new_rvalue_one(elem_type);
 
-        let mut shift = 0;
         for i in 0..in_len {
             let elem =
                 bx.extract_element(vector, bx.context.new_rvalue_from_int(bx.int_type, i as i32));
@@ -541,17 +677,16 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             let masked = shifted & one;
             result = result
                 | (bx.context.new_cast(None, masked, result_type)
-                    << bx.context.new_rvalue_from_int(result_type, shift));
-            shift += 1;
+                    << bx.context.new_rvalue_from_int(result_type, i as i32));
         }
 
-        match ret_ty.kind() {
+        match *ret_ty.kind() {
             ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => {
                 // Zero-extend iN to the bitmask type:
                 return Ok(result);
             }
             ty::Array(elem, len)
-                if matches!(elem.kind(), ty::Uint(ty::UintTy::U8))
+                if matches!(*elem.kind(), ty::Uint(ty::UintTy::U8))
                     && len.try_eval_target_usize(bx.tcx, ty::ParamEnv::reveal_all())
                         == Some(expected_bytes) =>
             {
@@ -590,7 +725,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                 return Err(());
             }};
         }
-        let (elem_ty_str, elem_ty) = if let ty::Float(f) = in_elem.kind() {
+        let (elem_ty_str, elem_ty) = if let ty::Float(ref f) = *in_elem.kind() {
             let elem_ty = bx.cx.type_float_from_ty(*f);
             match f.bit_width() {
                 32 => ("f", elem_ty),
@@ -816,7 +951,9 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         let (_, element_ty0) = arg_tys[0].simd_size_and_type(bx.tcx());
         let (_, element_ty1) = arg_tys[1].simd_size_and_type(bx.tcx());
         let (pointer_count, underlying_ty) = match *element_ty1.kind() {
-            ty::RawPtr(p_ty, _) if p_ty == in_elem => (ptr_count(element_ty1), non_ptr(element_ty1)),
+            ty::RawPtr(p_ty, _) if p_ty == in_elem => {
+                (ptr_count(element_ty1), non_ptr(element_ty1))
+            }
             _ => {
                 require!(
                     false,
@@ -839,7 +976,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
 
         // The element type of the third argument must be a signed integer type of any width:
         let (_, element_ty2) = arg_tys[2].simd_size_and_type(bx.tcx());
-        match element_ty2.kind() {
+        match *element_ty2.kind() {
             ty::Int(_) => (),
             _ => {
                 require!(
@@ -955,7 +1092,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         assert_eq!(underlying_ty, non_ptr(element_ty0));
 
         // The element type of the third argument must be a signed integer type of any width:
-        match element_ty2.kind() {
+        match *element_ty2.kind() {
             ty::Int(_) => (),
             _ => {
                 require!(
@@ -1013,7 +1150,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
     macro_rules! arith_unary {
         ($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
             $(if name == sym::$name {
-                match in_elem.kind() {
+                match *in_elem.kind() {
                     $($(ty::$p(_))|* => {
                         return Ok(bx.$call(args[0].immediate()))
                     })*
@@ -1137,7 +1274,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                     ret_ty == in_elem,
                     InvalidMonomorphization::ReturnType { span, name, in_elem, in_ty, ret_ty }
                 );
-                return match in_elem.kind() {
+                return match *in_elem.kind() {
                     ty::Int(_) | ty::Uint(_) => {
                         let r = bx.vector_reduce_op(args[0].immediate(), $vec_op);
                         if $ordered {
@@ -1206,7 +1343,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                     ret_ty == in_elem,
                     InvalidMonomorphization::ReturnType { span, name, in_elem, in_ty, ret_ty }
                 );
-                return match in_elem.kind() {
+                return match *in_elem.kind() {
                     ty::Int(_) | ty::Uint(_) => Ok(bx.$int_red(args[0].immediate())),
                     ty::Float(_) => Ok(bx.$float_red(args[0].immediate())),
                     _ => return_error!(InvalidMonomorphization::UnsupportedSymbol {
@@ -1235,7 +1372,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                     );
                     args[0].immediate()
                 } else {
-                    match in_elem.kind() {
+                    match *in_elem.kind() {
                         ty::Int(_) | ty::Uint(_) => {}
                         _ => return_error!(InvalidMonomorphization::UnsupportedSymbol {
                             span,
@@ -1249,7 +1386,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
 
                     args[0].immediate()
                 };
-                return match in_elem.kind() {
+                return match *in_elem.kind() {
                     ty::Int(_) | ty::Uint(_) => {
                         let r = bx.vector_reduce_op(input, $op);
                         Ok(if !$boolean {
diff --git a/compiler/rustc_codegen_gcc/src/lib.rs b/compiler/rustc_codegen_gcc/src/lib.rs
index 24856506c4644..1132b0cd2f5ab 100644
--- a/compiler/rustc_codegen_gcc/src/lib.rs
+++ b/compiler/rustc_codegen_gcc/src/lib.rs
@@ -4,7 +4,7 @@
  * TODO(antoyo): support LTO (gcc's equivalent to Full LTO is -flto -flto-partition=one — https://documentation.suse.com/sbp/all/html/SBP-GCC-10/index.html).
  * For Thin LTO, this might be helpful:
  * In gcc 4.6 -fwhopr was removed and became default with -flto. The non-whopr path can still be executed via -flto-partition=none.
- * Or the new incremental LTO?
+ * Or the new incremental LTO (https://www.phoronix.com/news/GCC-Incremental-LTO-Patches)?
  *
  * Maybe some missing optizations enabled by rustc's LTO is in there: https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
  * Like -fipa-icf (should be already enabled) and maybe -fdevirtualize-at-ltrans.
@@ -16,12 +16,13 @@
 #![allow(internal_features)]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![feature(rustc_private, decl_macro, never_type, trusted_len, hash_raw_entry)]
+#![feature(rustc_private, decl_macro, never_type, trusted_len, hash_raw_entry, let_chains)]
 #![allow(broken_intra_doc_links)]
 #![recursion_limit = "256"]
 #![warn(rust_2018_idioms)]
 #![warn(unused_lifetimes)]
 #![deny(clippy::pattern_type_mismatch)]
+#![allow(clippy::needless_lifetimes)]
 
 extern crate rustc_apfloat;
 extern crate rustc_ast;
@@ -73,6 +74,7 @@ mod type_of;
 
 use std::any::Any;
 use std::fmt::Debug;
+use std::ops::Deref;
 #[cfg(not(feature = "master"))]
 use std::sync::atomic::AtomicBool;
 #[cfg(not(feature = "master"))]
@@ -80,8 +82,9 @@ use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::sync::Mutex;
 
+use back::lto::ThinBuffer;
+use back::lto::ThinData;
 use errors::LTONotSupported;
-#[cfg(not(feature = "master"))]
 use gccjit::CType;
 use gccjit::{Context, OptimizationLevel};
 #[cfg(feature = "master")]
@@ -92,9 +95,7 @@ use rustc_codegen_ssa::back::write::{
     CodegenContext, FatLtoInput, ModuleConfig, TargetMachineFactoryFn,
 };
 use rustc_codegen_ssa::base::codegen_crate;
-use rustc_codegen_ssa::traits::{
-    CodegenBackend, ExtraBackendMethods, ThinBufferMethods, WriteBackendMethods,
-};
+use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, WriteBackendMethods};
 use rustc_codegen_ssa::{CodegenResults, CompiledModule, ModuleCodegen};
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync::IntoDynSyncSend;
@@ -139,6 +140,10 @@ impl TargetInfo {
     fn supports_128bit_int(&self) -> bool {
         self.supports_128bit_integers.load(Ordering::SeqCst)
     }
+
+    fn supports_target_dependent_type(&self, _typ: CType) -> bool {
+        false
+    }
 }
 
 #[derive(Clone)]
@@ -160,6 +165,10 @@ impl LockedTargetInfo {
     fn supports_128bit_int(&self) -> bool {
         self.info.lock().expect("lock").supports_128bit_int()
     }
+
+    fn supports_target_dependent_type(&self, typ: CType) -> bool {
+        self.info.lock().expect("lock").supports_target_dependent_type(typ)
+    }
 }
 
 #[derive(Clone)]
@@ -188,6 +197,7 @@ impl CodegenBackend for GccCodegenBackend {
 
         #[cfg(feature = "master")]
         gccjit::set_global_personality_function_name(b"rust_eh_personality\0");
+
         if sess.lto() == Lto::Thin {
             sess.dcx().emit_warn(LTONotSupported {});
         }
@@ -293,7 +303,7 @@ impl ExtraBackendMethods for GccCodegenBackend {
         alloc_error_handler_kind: AllocatorKind,
     ) -> Self::Module {
         let mut mods = GccContext {
-            context: new_context(tcx),
+            context: Arc::new(SyncContext::new(new_context(tcx))),
             should_combine_object_files: false,
             temp_dir: None,
         };
@@ -323,35 +333,42 @@ impl ExtraBackendMethods for GccCodegenBackend {
     }
 }
 
-pub struct ThinBuffer;
+pub struct GccContext {
+    context: Arc<SyncContext>,
+    should_combine_object_files: bool,
+    // Temporary directory used by LTO. We keep it here so that it's not removed before linking.
+    temp_dir: Option<TempDir>,
+}
 
-impl ThinBufferMethods for ThinBuffer {
-    fn data(&self) -> &[u8] {
-        unimplemented!();
-    }
+struct SyncContext {
+    context: Context<'static>,
+}
 
-    fn thin_link_data(&self) -> &[u8] {
-        unimplemented!();
+impl SyncContext {
+    fn new(context: Context<'static>) -> Self {
+        Self { context }
     }
 }
 
-pub struct GccContext {
-    context: Context<'static>,
-    should_combine_object_files: bool,
-    // Temporary directory used by LTO. We keep it here so that it's not removed before linking.
-    temp_dir: Option<TempDir>,
+impl Deref for SyncContext {
+    type Target = Context<'static>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.context
+    }
 }
 
-unsafe impl Send for GccContext {}
-// FIXME(antoyo): that shouldn't be Sync. Parallel compilation is currently disabled with "-Zno-parallel-llvm". Try to disable it here.
-unsafe impl Sync for GccContext {}
+unsafe impl Send for SyncContext {}
+// FIXME(antoyo): that shouldn't be Sync. Parallel compilation is currently disabled with "-Zno-parallel-llvm".
+// TODO: disable it here by returing false in CodegenBackend::supports_parallel().
+unsafe impl Sync for SyncContext {}
 
 impl WriteBackendMethods for GccCodegenBackend {
     type Module = GccContext;
     type TargetMachine = ();
     type TargetMachineError = ();
     type ModuleBuffer = ModuleBuffer;
-    type ThinData = ();
+    type ThinData = ThinData;
     type ThinBuffer = ThinBuffer;
 
     fn run_fat_lto(
@@ -363,11 +380,11 @@ impl WriteBackendMethods for GccCodegenBackend {
     }
 
     fn run_thin_lto(
-        _cgcx: &CodegenContext<Self>,
-        _modules: Vec<(String, Self::ThinBuffer)>,
-        _cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
+        cgcx: &CodegenContext<Self>,
+        modules: Vec<(String, Self::ThinBuffer)>,
+        cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
     ) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
-        unimplemented!();
+        back::lto::run_thin(cgcx, modules, cached_modules)
     }
 
     fn print_pass_timings(&self) {
@@ -397,10 +414,10 @@ impl WriteBackendMethods for GccCodegenBackend {
     }
 
     unsafe fn optimize_thin(
-        _cgcx: &CodegenContext<Self>,
-        _thin: ThinModule<Self>,
+        cgcx: &CodegenContext<Self>,
+        thin: ThinModule<Self>,
     ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
-        unimplemented!();
+        back::lto::optimize_thin_module(thin, cgcx)
     }
 
     unsafe fn codegen(
@@ -413,10 +430,10 @@ impl WriteBackendMethods for GccCodegenBackend {
     }
 
     fn prepare_thin(
-        _module: ModuleCodegen<Self::Module>,
-        _emit_summary: bool,
+        module: ModuleCodegen<Self::Module>,
+        emit_summary: bool,
     ) -> (String, Self::ThinBuffer) {
-        unimplemented!();
+        back::lto::prepare_thin(module, emit_summary)
     }
 
     fn serialize_module(_module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer) {
@@ -437,7 +454,8 @@ impl WriteBackendMethods for GccCodegenBackend {
 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
     #[cfg(feature = "master")]
     let info = {
-        // Check whether the target supports 128-bit integers.
+        // Check whether the target supports 128-bit integers, and sized floating point types (like
+        // Float16).
         let context = Context::default();
         Arc::new(Mutex::new(IntoDynSyncSend(context.get_target_info())))
     };
@@ -467,6 +485,7 @@ pub fn target_features(
     allow_unstable: bool,
     target_info: &LockedTargetInfo,
 ) -> Vec<Symbol> {
+    // TODO(antoyo): use global_gcc_features.
     sess.target
         .supported_target_features()
         .iter()
@@ -477,8 +496,12 @@ pub fn target_features(
                 None
             }
         })
-        .filter(|_feature| {
-            target_info.cpu_supports(_feature)
+        .filter(|feature| {
+            // TODO: we disable Neon for now since we don't support the LLVM intrinsics for it.
+            if *feature == "neon" {
+                return false;
+            }
+            target_info.cpu_supports(feature)
             /*
               adx, aes, avx, avx2, avx512bf16, avx512bitalg, avx512bw, avx512cd, avx512dq, avx512er, avx512f, avx512fp16, avx512ifma,
               avx512pf, avx512vbmi, avx512vbmi2, avx512vl, avx512vnni, avx512vp2intersect, avx512vpopcntdq,
diff --git a/compiler/rustc_codegen_gcc/src/mono_item.rs b/compiler/rustc_codegen_gcc/src/mono_item.rs
index 359d3c70b4cae..44657ad4f6e25 100644
--- a/compiler/rustc_codegen_gcc/src/mono_item.rs
+++ b/compiler/rustc_codegen_gcc/src/mono_item.rs
@@ -81,6 +81,6 @@ impl<'gcc, 'tcx> PreDefineMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         // TODO(antoyo): use inline attribute from there in linkage.set() above.
 
         self.functions.borrow_mut().insert(symbol_name.to_string(), decl);
-        self.function_instances.borrow_mut().insert(instance, unsafe { std::mem::transmute(decl) });
+        self.function_instances.borrow_mut().insert(instance, decl);
     }
 }
diff --git a/compiler/rustc_codegen_gcc/src/type_.rs b/compiler/rustc_codegen_gcc/src/type_.rs
index 4caff2e63106a..e20234c5ce79c 100644
--- a/compiler/rustc_codegen_gcc/src/type_.rs
+++ b/compiler/rustc_codegen_gcc/src/type_.rs
@@ -1,3 +1,8 @@
+#[cfg(feature = "master")]
+use std::convert::TryInto;
+
+#[cfg(feature = "master")]
+use gccjit::CType;
 use gccjit::{RValue, Struct, Type};
 use rustc_codegen_ssa::common::TypeKind;
 use rustc_codegen_ssa::traits::{BaseTypeMethods, DerivedTypeMethods, TypeMembershipMethods};
@@ -142,25 +147,76 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     }
 
     fn type_f16(&self) -> Type<'gcc> {
-        unimplemented!("f16_f128")
+        #[cfg(feature = "master")]
+        if self.supports_f16_type {
+            return self.context.new_c_type(CType::Float16);
+        }
+        bug!("unsupported float width 16")
     }
 
     fn type_f32(&self) -> Type<'gcc> {
+        #[cfg(feature = "master")]
+        if self.supports_f32_type {
+            return self.context.new_c_type(CType::Float32);
+        }
         self.float_type
     }
 
     fn type_f64(&self) -> Type<'gcc> {
+        #[cfg(feature = "master")]
+        if self.supports_f64_type {
+            return self.context.new_c_type(CType::Float64);
+        }
         self.double_type
     }
 
     fn type_f128(&self) -> Type<'gcc> {
-        unimplemented!("f16_f128")
+        #[cfg(feature = "master")]
+        if self.supports_f128_type {
+            return self.context.new_c_type(CType::Float128);
+        }
+        bug!("unsupported float width 128")
     }
 
     fn type_func(&self, params: &[Type<'gcc>], return_type: Type<'gcc>) -> Type<'gcc> {
         self.context.new_function_pointer_type(None, return_type, params, false)
     }
 
+    #[cfg(feature = "master")]
+    fn type_kind(&self, typ: Type<'gcc>) -> TypeKind {
+        if self.is_int_type_or_bool(typ) {
+            TypeKind::Integer
+        } else if typ.get_pointee().is_some() {
+            TypeKind::Pointer
+        } else if typ.is_vector() {
+            TypeKind::Vector
+        } else if typ.dyncast_array().is_some() {
+            TypeKind::Array
+        } else if typ.is_struct().is_some() {
+            TypeKind::Struct
+        } else if typ.dyncast_function_ptr_type().is_some() {
+            TypeKind::Function
+        } else if typ.is_compatible_with(self.float_type) {
+            TypeKind::Float
+        } else if typ.is_compatible_with(self.double_type) {
+            TypeKind::Double
+        } else if typ.is_floating_point() {
+            match typ.get_size() {
+                2 => TypeKind::Half,
+                4 => TypeKind::Float,
+                8 => TypeKind::Double,
+                16 => TypeKind::FP128,
+                size => unreachable!("Floating-point type of size {}", size),
+            }
+        } else if typ == self.type_void() {
+            TypeKind::Void
+        } else {
+            // TODO(antoyo): support other types.
+            unimplemented!();
+        }
+    }
+
+    #[cfg(not(feature = "master"))]
     fn type_kind(&self, typ: Type<'gcc>) -> TypeKind {
         if self.is_int_type_or_bool(typ) {
             TypeKind::Integer
@@ -170,9 +226,19 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
             TypeKind::Double
         } else if typ.is_vector() {
             TypeKind::Vector
+        } else if typ.get_pointee().is_some() {
+            TypeKind::Pointer
+        } else if typ.dyncast_array().is_some() {
+            TypeKind::Array
+        } else if typ.is_struct().is_some() {
+            TypeKind::Struct
+        } else if typ.dyncast_function_ptr_type().is_some() {
+            TypeKind::Function
+        } else if typ == self.type_void() {
+            TypeKind::Void
         } else {
             // TODO(antoyo): support other types.
-            TypeKind::Void
+            unimplemented!();
         }
     }
 
@@ -200,6 +266,16 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         unimplemented!();
     }
 
+    #[cfg(feature = "master")]
+    fn float_width(&self, typ: Type<'gcc>) -> usize {
+        if typ.is_floating_point() {
+            (typ.get_size() * u8::BITS).try_into().unwrap()
+        } else {
+            panic!("Cannot get width of float type {:?}", typ);
+        }
+    }
+
+    #[cfg(not(feature = "master"))]
     fn float_width(&self, typ: Type<'gcc>) -> usize {
         let f32 = self.context.new_type::<f32>();
         let f64 = self.context.new_type::<f64>();
diff --git a/compiler/rustc_codegen_gcc/src/type_of.rs b/compiler/rustc_codegen_gcc/src/type_of.rs
index a88d50cb43403..d85ed4f12ffab 100644
--- a/compiler/rustc_codegen_gcc/src/type_of.rs
+++ b/compiler/rustc_codegen_gcc/src/type_of.rs
@@ -8,7 +8,7 @@ use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{self, CoroutineArgsExt, Ty, TypeVisitableExt};
 use rustc_target::abi::call::{CastTarget, FnAbi, Reg};
 use rustc_target::abi::{
-    self, Abi, Align, FieldsShape, Float, Int, Integer, PointeeInfo, Pointer, Size, TyAbiInterface,
+    self, Abi, FieldsShape, Float, Int, Integer, PointeeInfo, Pointer, Size, TyAbiInterface,
     Variants,
 };
 
@@ -53,12 +53,6 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     }
 }
 
-impl<'a, 'tcx> CodegenCx<'a, 'tcx> {
-    pub fn align_of(&self, ty: Ty<'tcx>) -> Align {
-        self.layout_of(ty).align.abi
-    }
-}
-
 fn uncached_gcc_type<'gcc, 'tcx>(
     cx: &CodegenCx<'gcc, 'tcx>,
     layout: TyAndLayout<'tcx>,
@@ -90,7 +84,7 @@ fn uncached_gcc_type<'gcc, 'tcx>(
         Abi::Uninhabited | Abi::Aggregate { .. } => {}
     }
 
-    let name = match layout.ty.kind() {
+    let name = match *layout.ty.kind() {
         // FIXME(eddyb) producing readable type names for trait objects can result
         // in problematically distinct types due to HRTB and subtyping (see #47638).
         // ty::Dynamic(..) |
@@ -220,7 +214,7 @@ impl<'tcx> LayoutGccExt<'tcx> for TyAndLayout<'tcx> {
                 // to fn_ptr_backend_type handle the on-stack attribute.
                 // TODO(antoyo): find a less hackish way to hande the on-stack attribute.
                 ty::FnPtr(sig) => {
-                    cx.fn_ptr_backend_type(&cx.fn_abi_of_fn_ptr(sig, ty::List::empty()))
+                    cx.fn_ptr_backend_type(cx.fn_abi_of_fn_ptr(sig, ty::List::empty()))
                 }
                 _ => self.scalar_gcc_type_at(cx, scalar, Size::ZERO),
             };
diff --git a/compiler/rustc_codegen_gcc/target_specs/m68k-unknown-linux-gnu.json b/compiler/rustc_codegen_gcc/target_specs/m68k-unknown-linux-gnu.json
new file mode 100644
index 0000000000000..95ea06106fb1b
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/target_specs/m68k-unknown-linux-gnu.json
@@ -0,0 +1,26 @@
+{
+  "arch": "m68k",
+  "cpu": "M68020",
+  "crt-static-respected": true,
+  "data-layout": "E-m:e-p:32:16:32-i8:8:8-i16:16:16-i32:16:32-n8:16:32-a:0:16-S16",
+  "dynamic-linking": true,
+  "env": "gnu",
+  "has-rpath": true,
+  "has-thread-local": true,
+  "llvm-target": "m68k-unknown-linux-gnu",
+  "max-atomic-width": 32,
+  "os": "linux",
+  "position-independent-executables": true,
+  "relro-level": "full",
+  "supported-split-debuginfo": [
+    "packed",
+    "unpacked",
+    "off"
+  ],
+  "target-endian": "big",
+  "target-family": [
+    "unix"
+  ],
+  "target-mcount": "_mcount",
+  "target-pointer-width": "32"
+}
diff --git a/compiler/rustc_codegen_gcc/tests/failing-ice-tests.txt b/compiler/rustc_codegen_gcc/tests/failing-ice-tests.txt
new file mode 100644
index 0000000000000..2084f86b62e19
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/tests/failing-ice-tests.txt
@@ -0,0 +1,36 @@
+tests/ui/treat-err-as-bug/span_delayed_bug.rs
+tests/ui/treat-err-as-bug/err.rs
+tests/ui/simd/not-out-of-bounds.rs
+tests/ui/simd/monomorphize-shuffle-index.rs
+tests/ui/simd/masked-load-store-build-fail.rs
+tests/ui/simd/intrinsic/generic-shuffle.rs
+tests/ui/simd/intrinsic/generic-elements.rs
+tests/ui/simd/intrinsic/generic-cast.rs
+tests/ui/simd/intrinsic/generic-arithmetic-saturating-2.rs
+tests/ui/simd/intrinsic/generic-arithmetic-2.rs
+tests/ui/panics/default-backtrace-ice.rs
+tests/ui/mir/lint/storage-live.rs
+tests/ui/layout/valid_range_oob.rs
+tests/ui/higher-ranked/trait-bounds/future.rs
+tests/ui/consts/const-eval/const-eval-query-stack.rs
+tests/ui/simd/masked-load-store.rs
+tests/ui/simd/issue-39720.rs
+tests/ui/simd/intrinsic/ptr-cast.rs
+tests/ui/sepcomp/sepcomp-statics.rs
+tests/ui/sepcomp/sepcomp-fns.rs
+tests/ui/sepcomp/sepcomp-fns-backwards.rs
+tests/ui/sepcomp/sepcomp-extern.rs
+tests/ui/sepcomp/sepcomp-cci.rs
+tests/ui/lto/thin-lto-inlines2.rs
+tests/ui/lto/weak-works.rs
+tests/ui/lto/thin-lto-inlines.rs
+tests/ui/lto/thin-lto-global-allocator.rs
+tests/ui/lto/msvc-imp-present.rs
+tests/ui/lto/dylib-works.rs
+tests/ui/lto/all-crates.rs
+tests/ui/issues/issue-47364.rs
+tests/ui/functions-closures/parallel-codegen-closures.rs
+tests/ui/sepcomp/sepcomp-unwind.rs
+tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs
+tests/ui/extern/issue-64655-allow-unwind-when-calling-panic-directly.rs
+tests/ui/unwind-no-uwtable.rs
diff --git a/compiler/rustc_codegen_gcc/tests/failing-lto-tests.txt b/compiler/rustc_codegen_gcc/tests/failing-lto-tests.txt
index 6e1ed99c6f7a9..b9126fb73a775 100644
--- a/compiler/rustc_codegen_gcc/tests/failing-lto-tests.txt
+++ b/compiler/rustc_codegen_gcc/tests/failing-lto-tests.txt
@@ -30,3 +30,4 @@ tests/ui/macros/rfc-2011-nicer-assert-messages/feature-gate-generic_assert.rs
 tests/ui/macros/stringify.rs
 tests/ui/reexport-test-harness-main.rs
 tests/ui/rfcs/rfc-1937-termination-trait/termination-trait-in-test.rs
+tests/ui/binding/fn-arg-incomplete-pattern-drop-order.rs
diff --git a/compiler/rustc_codegen_gcc/tests/failing-run-make-tests.txt b/compiler/rustc_codegen_gcc/tests/failing-run-make-tests.txt
new file mode 100644
index 0000000000000..842533cd3c62c
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/tests/failing-run-make-tests.txt
@@ -0,0 +1,42 @@
+tests/run-make/a-b-a-linker-guard/
+tests/run-make/CURRENT_RUSTC_VERSION/
+tests/run-make/cross-lang-lto/
+tests/run-make/cross-lang-lto-upstream-rlibs/
+tests/run-make/doctests-keep-binaries/
+tests/run-make/doctests-runtool/
+tests/run-make/emit-shared-files/
+tests/run-make/exit-code/
+tests/run-make/issue-22131/
+tests/run-make/issue-64153/
+tests/run-make/llvm-ident/
+tests/run-make/native-link-modifier-bundle/
+tests/run-make/remap-path-prefix-dwarf/
+tests/run-make/repr128-dwarf/
+tests/run-make/rlib-format-packed-bundled-libs/
+tests/run-make/rlib-format-packed-bundled-libs-2/
+tests/run-make/rustdoc-determinism/
+tests/run-make/rustdoc-error-lines/
+tests/run-make/rustdoc-map-file/
+tests/run-make/rustdoc-output-path/
+tests/run-make/rustdoc-scrape-examples-invalid-expr/
+tests/run-make/rustdoc-scrape-examples-multiple/
+tests/run-make/rustdoc-scrape-examples-ordering/
+tests/run-make/rustdoc-scrape-examples-remap/
+tests/run-make/rustdoc-scrape-examples-test/
+tests/run-make/rustdoc-scrape-examples-whitespace/
+tests/run-make/rustdoc-scrape-examples-macros/
+tests/run-make/rustdoc-with-out-dir-option/
+tests/run-make/rustdoc-verify-output-files/
+tests/run-make/rustdoc-themes/
+tests/run-make/rustdoc-with-short-out-dir-option/
+tests/run-make/rustdoc-with-output-option/
+tests/run-make/arguments-non-c-like-enum/
+tests/run-make/c-link-to-rust-staticlib/
+tests/run-make/foreign-double-unwind/
+tests/run-make/foreign-exceptions/
+tests/run-make/glibc-staticlib-args/
+tests/run-make/issue-36710/
+tests/run-make/issue-68794-textrel-on-minimal-lib/
+tests/run-make/lto-smoke-c/
+tests/run-make/return-non-c-like-enum/
+
diff --git a/compiler/rustc_codegen_gcc/tests/failing-ui-tests.txt b/compiler/rustc_codegen_gcc/tests/failing-ui-tests.txt
index d13562f8bb01b..5a55bdb156e39 100644
--- a/compiler/rustc_codegen_gcc/tests/failing-ui-tests.txt
+++ b/compiler/rustc_codegen_gcc/tests/failing-ui-tests.txt
@@ -2,7 +2,6 @@ tests/ui/allocator/no_std-alloc-error-handler-custom.rs
 tests/ui/allocator/no_std-alloc-error-handler-default.rs
 tests/ui/asm/may_unwind.rs
 tests/ui/asm/x86_64/multiple-clobber-abi.rs
-tests/ui/debuginfo/debuginfo-emit-llvm-ir-and-split-debuginfo.rs
 tests/ui/functions-closures/parallel-codegen-closures.rs
 tests/ui/linkage-attr/linkage1.rs
 tests/ui/lto/dylib-works.rs
@@ -14,13 +13,12 @@ tests/ui/sepcomp/sepcomp-fns-backwards.rs
 tests/ui/sepcomp/sepcomp-fns.rs
 tests/ui/sepcomp/sepcomp-statics.rs
 tests/ui/asm/x86_64/may_unwind.rs
-tests/ui/backtrace.rs
 tests/ui/catch-unwind-bang.rs
-tests/ui/cfg/cfg-panic-abort.rs
 tests/ui/drop/dynamic-drop-async.rs
+tests/ui/cfg/cfg-panic-abort.rs
 tests/ui/drop/repeat-drop.rs
-tests/ui/fmt/format-args-capture.rs
 tests/ui/coroutine/panic-drops-resume.rs
+tests/ui/fmt/format-args-capture.rs
 tests/ui/coroutine/panic-drops.rs
 tests/ui/intrinsics/panic-uninitialized-zeroed.rs
 tests/ui/iterators/iter-sum-overflow-debug.rs
@@ -34,12 +32,8 @@ tests/ui/panic-runtime/abort.rs
 tests/ui/panic-runtime/link-to-abort.rs
 tests/ui/unwind-no-uwtable.rs
 tests/ui/parser/unclosed-delimiter-in-dep.rs
-tests/ui/runtime/rt-explody-panic-payloads.rs
-tests/ui/simd/intrinsic/ptr-cast.rs
-tests/ui/binding/fn-arg-incomplete-pattern-drop-order.rs
 tests/ui/consts/missing_span_in_backtrace.rs
 tests/ui/drop/dynamic-drop.rs
-tests/ui/dyn-star/box.rs
 tests/ui/issues/issue-40883.rs
 tests/ui/issues/issue-43853.rs
 tests/ui/issues/issue-47364.rs
@@ -48,29 +42,56 @@ tests/ui/rfcs/rfc-1857-stabilize-drop-order/drop-order.rs
 tests/ui/rfcs/rfc-2091-track-caller/std-panic-locations.rs
 tests/ui/simd/issue-17170.rs
 tests/ui/simd/issue-39720.rs
-tests/ui/statics/issue-91050-1.rs
-tests/ui/statics/issue-91050-2.rs
 tests/ui/alloc-error/default-alloc-error-hook.rs
 tests/ui/coroutine/panic-safe.rs
 tests/ui/issues/issue-14875.rs
 tests/ui/issues/issue-29948.rs
 tests/ui/panics/nested_panic_caught.rs
-tests/ui/const_prop/ice-issue-111353.rs
 tests/ui/process/println-with-broken-pipe.rs
-tests/ui/panic-runtime/lto-abort.rs
 tests/ui/lto/thin-lto-inlines2.rs
 tests/ui/lto/weak-works.rs
+tests/ui/panic-runtime/lto-abort.rs 
 tests/ui/lto/thin-lto-inlines.rs
 tests/ui/lto/thin-lto-global-allocator.rs
 tests/ui/lto/msvc-imp-present.rs
 tests/ui/lto/lto-thin-rustc-loads-linker-plugin.rs
 tests/ui/lto/all-crates.rs
 tests/ui/async-await/deep-futures-are-freeze.rs
-tests/ui/closures/capture-unsized-by-ref.rs
 tests/ui/coroutine/resume-after-return.rs
-tests/ui/macros/rfc-2011-nicer-assert-messages/all-expr-kinds.rs
 tests/ui/simd/masked-load-store.rs
 tests/ui/simd/repr_packed.rs
 tests/ui/async-await/in-trait/dont-project-to-specializable-projection.rs
 tests/ui/consts/try-operator.rs
 tests/ui/coroutine/unwind-abort-mix.rs
+tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query.rs
+tests/ui/impl-trait/equality-in-canonical-query.rs
+tests/ui/consts/issue-miri-1910.rs
+tests/ui/mir/mir_heavy_promoted.rs
+tests/ui/consts/const_cmp_type_id.rs
+tests/ui/consts/issue-73976-monomorphic.rs
+tests/ui/consts/issue-94675.rs
+tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop-fail.rs
+tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop.rs
+tests/ui/runtime/on-broken-pipe/child-processes.rs
+tests/ui/sanitizer/cfi-assoc-ty-lifetime-issue-123053.rs
+tests/ui/sanitizer/cfi-async-closures.rs
+tests/ui/sanitizer/cfi-closures.rs
+tests/ui/sanitizer/cfi-complex-receiver.rs
+tests/ui/sanitizer/cfi-coroutine.rs
+tests/ui/sanitizer/cfi-drop-in-place.rs
+tests/ui/sanitizer/cfi-drop-no-principal.rs
+tests/ui/sanitizer/cfi-fn-ptr.rs
+tests/ui/sanitizer/cfi-self-ref.rs
+tests/ui/sanitizer/cfi-supertraits.rs
+tests/ui/sanitizer/cfi-virtual-auto.rs
+tests/ui/sanitizer/kcfi-mangling.rs
+tests/ui/statics/const_generics.rs
+tests/ui/backtrace/dylib-dep.rs
+tests/ui/errors/pic-linker.rs
+tests/ui/delegation/fn-header.rs
+tests/ui/consts/zst_no_llvm_alloc.rs
+tests/ui/consts/const-eval/parse_ints.rs
+tests/ui/simd/intrinsic/generic-arithmetic-pass.rs
+tests/ui/backtrace/backtrace.rs
+tests/ui/lifetimes/tail-expr-lock-poisoning.rs
+tests/ui/runtime/rt-explody-panic-payloads.rs
diff --git a/compiler/rustc_codegen_gcc/tests/hello-world/Cargo.toml b/compiler/rustc_codegen_gcc/tests/hello-world/Cargo.toml
new file mode 100644
index 0000000000000..0b8cdc63fbe84
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/tests/hello-world/Cargo.toml
@@ -0,0 +1,4 @@
+[package]
+name = "hello_world"
+
+[dependencies]
diff --git a/compiler/rustc_codegen_gcc/tests/hello-world/src/main.rs b/compiler/rustc_codegen_gcc/tests/hello-world/src/main.rs
new file mode 100644
index 0000000000000..e7a11a969c037
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/tests/hello-world/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}
diff --git a/compiler/rustc_codegen_gcc/tests/lang_tests_common.rs b/compiler/rustc_codegen_gcc/tests/lang_tests_common.rs
index 09307836fd424..aecea37ab5a91 100644
--- a/compiler/rustc_codegen_gcc/tests/lang_tests_common.rs
+++ b/compiler/rustc_codegen_gcc/tests/lang_tests_common.rs
@@ -80,8 +80,7 @@ pub fn main_inner(profile: Profile) {
             compiler.args([
                 &format!("-Zcodegen-backend={}/target/debug/librustc_codegen_gcc.so", current_dir),
                 "--sysroot",
-                &format!("{}/build_sysroot/sysroot/", current_dir),
-                "-Zno-parallel-llvm",
+                &format!("{}/build/build_sysroot/sysroot/", current_dir),
                 "-C",
                 "link-arg=-lc",
                 "-o",
diff --git a/compiler/rustc_codegen_gcc/tests/run/array.rs b/compiler/rustc_codegen_gcc/tests/run/array.rs
index afd0eed82004c..3fe8917c9a3c4 100644
--- a/compiler/rustc_codegen_gcc/tests/run/array.rs
+++ b/compiler/rustc_codegen_gcc/tests/run/array.rs
@@ -205,6 +205,17 @@ impl Sub for i16 {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
+#[track_caller]
+#[lang = "panic_const_sub_overflow"]
+pub fn panic_const_sub_overflow() -> ! {
+    panic("attempt to subtract with overflow");
+}
 
 /*
  * Code
diff --git a/compiler/rustc_codegen_gcc/tests/run/assign.rs b/compiler/rustc_codegen_gcc/tests/run/assign.rs
index 5b0db2da294dd..e105d64a8ad8f 100644
--- a/compiler/rustc_codegen_gcc/tests/run/assign.rs
+++ b/compiler/rustc_codegen_gcc/tests/run/assign.rs
@@ -120,6 +120,12 @@ impl Add for isize {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
 /*
  * Code
  */
diff --git a/compiler/rustc_codegen_gcc/tests/run/closure.rs b/compiler/rustc_codegen_gcc/tests/run/closure.rs
index 4ce528f86800c..355f0acee7473 100644
--- a/compiler/rustc_codegen_gcc/tests/run/closure.rs
+++ b/compiler/rustc_codegen_gcc/tests/run/closure.rs
@@ -189,6 +189,12 @@ pub fn panic(_msg: &'static str) -> ! {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
 /*
  * Code
  */
diff --git a/compiler/rustc_codegen_gcc/tests/run/mut_ref.rs b/compiler/rustc_codegen_gcc/tests/run/mut_ref.rs
index 194e55a3deaeb..5a3f72b69047e 100644
--- a/compiler/rustc_codegen_gcc/tests/run/mut_ref.rs
+++ b/compiler/rustc_codegen_gcc/tests/run/mut_ref.rs
@@ -122,6 +122,12 @@ impl Add for isize {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
 /*
  * Code
  */
diff --git a/compiler/rustc_codegen_gcc/tests/run/operations.rs b/compiler/rustc_codegen_gcc/tests/run/operations.rs
index 2d781670873f0..d697bd921cd11 100644
--- a/compiler/rustc_codegen_gcc/tests/run/operations.rs
+++ b/compiler/rustc_codegen_gcc/tests/run/operations.rs
@@ -207,6 +207,24 @@ impl Mul for isize {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
+#[track_caller]
+#[lang = "panic_const_sub_overflow"]
+pub fn panic_const_sub_overflow() -> ! {
+    panic("attempt to subtract with overflow");
+}
+
+#[track_caller]
+#[lang = "panic_const_mul_overflow"]
+pub fn panic_const_mul_overflow() -> ! {
+    panic("attempt to multiply with overflow");
+}
+
 /*
  * Code
  */
diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index cd82894af18eb..e766947002639 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -6,7 +6,6 @@ use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, PatchableFuncti
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_session::config::{FunctionReturn, OptLevel};
 use rustc_span::symbol::sym;
-use rustc_target::spec::abi::Abi;
 use rustc_target::spec::{FramePointer, SanitizerSet, StackProbeType, StackProtector};
 use smallvec::SmallVec;
 
@@ -482,7 +481,7 @@ pub fn from_fn_attrs<'ll, 'tcx>(
         return;
     }
 
-    let mut function_features = function_features
+    let function_features = function_features
         .iter()
         .flat_map(|feat| {
             llvm_util::to_llvm_features(cx.tcx.sess, feat).into_iter().map(|f| format!("+{f}"))
@@ -504,17 +503,6 @@ pub fn from_fn_attrs<'ll, 'tcx>(
             let name = name.as_str();
             to_add.push(llvm::CreateAttrStringValue(cx.llcx, "wasm-import-name", name));
         }
-
-        // The `"wasm"` abi on wasm targets automatically enables the
-        // `+multivalue` feature because the purpose of the wasm abi is to match
-        // the WebAssembly specification, which has this feature. This won't be
-        // needed when LLVM enables this `multivalue` feature by default.
-        if !cx.tcx.is_closure_like(instance.def_id()) {
-            let abi = cx.tcx.fn_sig(instance.def_id()).skip_binder().abi();
-            if abi == Abi::Wasm {
-                function_features.push("+multivalue".to_string());
-            }
-        }
     }
 
     let global_features = cx.tcx.global_backend_features(()).iter().map(|s| s.as_str());
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
index 742bfd76590a4..851a4c42e99b4 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
@@ -705,10 +705,12 @@ impl MsvcBasicName for ty::UintTy {
 
 impl MsvcBasicName for ty::FloatTy {
     fn msvc_basic_name(self) -> &'static str {
-        // FIXME: f16 and f128 have no MSVC representation. We could improve the debuginfo.
-        // See: <https://github.com/rust-lang/rust/pull/114607/files#r1454683264>
+        // FIXME(f16_f128): `f16` and `f128` have no MSVC representation. We could improve the
+        // debuginfo. See: <https://github.com/rust-lang/rust/issues/121837>
         match self {
-            ty::FloatTy::F16 => "half",
+            ty::FloatTy::F16 => {
+                bug!("`f16` should have been handled in `build_basic_type_di_node`")
+            }
             ty::FloatTy::F32 => "float",
             ty::FloatTy::F64 => "double",
             ty::FloatTy::F128 => "fp128",
@@ -716,6 +718,38 @@ impl MsvcBasicName for ty::FloatTy {
     }
 }
 
+fn build_cpp_f16_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) -> DINodeCreationResult<'ll> {
+    // MSVC has no native support for `f16`. Instead, emit `struct f16 { bits: u16 }` to allow the
+    // `f16`'s value to be displayed using a Natvis visualiser in `intrinsic.natvis`.
+    let float_ty = cx.tcx.types.f16;
+    let bits_ty = cx.tcx.types.u16;
+    type_map::build_type_with_children(
+        cx,
+        type_map::stub(
+            cx,
+            Stub::Struct,
+            UniqueTypeId::for_ty(cx.tcx, float_ty),
+            "f16",
+            cx.size_and_align_of(float_ty),
+            NO_SCOPE_METADATA,
+            DIFlags::FlagZero,
+        ),
+        // Fields:
+        |cx, float_di_node| {
+            smallvec![build_field_di_node(
+                cx,
+                float_di_node,
+                "bits",
+                cx.size_and_align_of(bits_ty),
+                Size::ZERO,
+                DIFlags::FlagZero,
+                type_di_node(cx, bits_ty),
+            )]
+        },
+        NO_GENERICS,
+    )
+}
+
 fn build_basic_type_di_node<'ll, 'tcx>(
     cx: &CodegenCx<'ll, 'tcx>,
     t: Ty<'tcx>,
@@ -739,6 +773,9 @@ fn build_basic_type_di_node<'ll, 'tcx>(
         ty::Char => ("char", DW_ATE_UTF),
         ty::Int(int_ty) if cpp_like_debuginfo => (int_ty.msvc_basic_name(), DW_ATE_signed),
         ty::Uint(uint_ty) if cpp_like_debuginfo => (uint_ty.msvc_basic_name(), DW_ATE_unsigned),
+        ty::Float(ty::FloatTy::F16) if cpp_like_debuginfo => {
+            return build_cpp_f16_di_node(cx);
+        }
         ty::Float(float_ty) if cpp_like_debuginfo => (float_ty.msvc_basic_name(), DW_ATE_float),
         ty::Int(int_ty) => (int_ty.name_str(), DW_ATE_signed),
         ty::Uint(uint_ty) => (uint_ty.name_str(), DW_ATE_unsigned),
diff --git a/compiler/rustc_codegen_llvm/src/intrinsic.rs b/compiler/rustc_codegen_llvm/src/intrinsic.rs
index e02c61cd29654..68c3d47e826bf 100644
--- a/compiler/rustc_codegen_llvm/src/intrinsic.rs
+++ b/compiler/rustc_codegen_llvm/src/intrinsic.rs
@@ -1469,8 +1469,10 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
         let (elem_ty_str, elem_ty) = if let ty::Float(f) = in_elem.kind() {
             let elem_ty = bx.cx.type_float_from_ty(*f);
             match f.bit_width() {
+                16 => ("f16", elem_ty),
                 32 => ("f32", elem_ty),
                 64 => ("f64", elem_ty),
+                128 => ("f128", elem_ty),
                 _ => return_error!(InvalidMonomorphization::FloatingPointVector {
                     span,
                     name,
diff --git a/compiler/rustc_const_eval/src/check_consts/check.rs b/compiler/rustc_const_eval/src/check_consts/check.rs
index 412effba32dc6..523d55fe2d03d 100644
--- a/compiler/rustc_const_eval/src/check_consts/check.rs
+++ b/compiler/rustc_const_eval/src/check_consts/check.rs
@@ -13,7 +13,7 @@ use rustc_middle::ty::{self, adjustment::PointerCoercion, Ty, TyCtxt};
 use rustc_middle::ty::{Instance, InstanceKind, TypeVisitableExt};
 use rustc_mir_dataflow::Analysis;
 use rustc_span::{sym, Span, Symbol, DUMMY_SP};
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::{self, ObligationCauseCode, ObligationCtxt};
 use rustc_type_ir::visit::{TypeSuperVisitable, TypeVisitor};
 
diff --git a/compiler/rustc_errors/src/diagnostic_impls.rs b/compiler/rustc_errors/src/diagnostic_impls.rs
index 0af80bc5c67b6..e6ca1bf7bc45f 100644
--- a/compiler/rustc_errors/src/diagnostic_impls.rs
+++ b/compiler/rustc_errors/src/diagnostic_impls.rs
@@ -298,15 +298,21 @@ impl IntoDiagArg for hir::def::Namespace {
 }
 
 #[derive(Clone)]
-pub struct DiagSymbolList(Vec<Symbol>);
+pub struct DiagSymbolList<S = Symbol>(Vec<S>);
 
-impl From<Vec<Symbol>> for DiagSymbolList {
-    fn from(v: Vec<Symbol>) -> Self {
+impl<S> From<Vec<S>> for DiagSymbolList<S> {
+    fn from(v: Vec<S>) -> Self {
         DiagSymbolList(v)
     }
 }
 
-impl IntoDiagArg for DiagSymbolList {
+impl<S> FromIterator<S> for DiagSymbolList<S> {
+    fn from_iter<T: IntoIterator<Item = S>>(iter: T) -> Self {
+        iter.into_iter().collect::<Vec<_>>().into()
+    }
+}
+
+impl<S: std::fmt::Display> IntoDiagArg for DiagSymbolList<S> {
     fn into_diag_arg(self) -> DiagArgValue {
         DiagArgValue::StrListSepByAnd(
             self.0.into_iter().map(|sym| Cow::Owned(format!("`{sym}`"))).collect(),
diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs
index 910402d5499fd..7b27049a579a1 100644
--- a/compiler/rustc_feature/src/builtin_attrs.rs
+++ b/compiler/rustc_feature/src/builtin_attrs.rs
@@ -556,7 +556,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     ),
     // RFC 2632
     gated!(
-        const_trait, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::Yes, const_trait_impl,
+        const_trait, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No, const_trait_impl,
         "`const_trait` is a temporary placeholder for marking a trait that is suitable for `const` \
         `impls` and all default bodies as `const`, which may be removed or renamed in the \
         future."
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs
index aea447b2aff10..f13aa506c1ec0 100644
--- a/compiler/rustc_feature/src/removed.rs
+++ b/compiler/rustc_feature/src/removed.rs
@@ -215,6 +215,9 @@ declare_features! (
     /// Permits specifying whether a function should permit unwinding or abort on unwind.
     (removed, unwind_attributes, "1.56.0", Some(58760), Some("use the C-unwind ABI instead")),
     (removed, visible_private_types, "1.0.0", None, None),
+    /// Allows `extern "wasm" fn`
+    (removed, wasm_abi, "CURRENT_RUSTC_VERSION", Some(83788),
+     Some("non-standard wasm ABI is no longer supported")),
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
     // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
index c05cac155b74b..948499fb38fbf 100644
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -248,6 +248,8 @@ declare_features! (
     (unstable, auto_traits, "1.50.0", Some(13231)),
     /// Allows using `box` in patterns (RFC 469).
     (unstable, box_patterns, "1.0.0", Some(29641)),
+    /// Allows builtin # foo() syntax
+    (internal, builtin_syntax, "1.71.0", Some(110680)),
     /// Allows `#[doc(notable_trait)]`.
     /// Renamed from `doc_spotlight`.
     (unstable, doc_notable_trait, "1.52.0", Some(45040)),
@@ -361,8 +363,6 @@ declare_features! (
     (unstable, async_fn_track_caller, "1.73.0", Some(110011)),
     /// Allows `for await` loops.
     (unstable, async_for_loop, "1.77.0", Some(118898)),
-    /// Allows builtin # foo() syntax
-    (unstable, builtin_syntax, "1.71.0", Some(110680)),
     /// Allows using C-variadics.
     (unstable, c_variadic, "1.34.0", Some(44930)),
     /// Allows the use of `#[cfg(overflow_checks)` to check if integer overflow behaviour.
@@ -640,8 +640,6 @@ declare_features! (
     (unstable, unsized_tuple_coercion, "1.20.0", Some(42877)),
     /// Allows using the `#[used(linker)]` (or `#[used(compiler)]`) attribute.
     (unstable, used_with_arg, "1.60.0", Some(93798)),
-    /// Allows `extern "wasm" fn`
-    (unstable, wasm_abi, "1.53.0", Some(83788)),
     /// Allows `do yeet` expressions
     (unstable, yeet_expr, "1.62.0", Some(96373)),
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
diff --git a/compiler/rustc_hir_analysis/messages.ftl b/compiler/rustc_hir_analysis/messages.ftl
index 91b1506d1e4e5..24c5377a3b125 100644
--- a/compiler/rustc_hir_analysis/messages.ftl
+++ b/compiler/rustc_hir_analysis/messages.ftl
@@ -373,10 +373,6 @@ hir_analysis_paren_sugar_attribute = the `#[rustc_paren_sugar]` attribute is a t
 hir_analysis_parenthesized_fn_trait_expansion =
     parenthesized trait syntax expands to `{$expanded_type}`
 
-hir_analysis_pass_to_variadic_function = can't pass `{$ty}` to variadic function
-    .suggestion = cast the value to `{$cast_ty}`
-    .help = cast the value to `{$cast_ty}`
-
 hir_analysis_pattern_type_non_const_range = range patterns must have constant range start and end
 hir_analysis_pattern_type_wild_pat = wildcard patterns are not permitted for pattern types
     .label = this type is the same as the inner type without a pattern
diff --git a/compiler/rustc_hir_analysis/src/bounds.rs b/compiler/rustc_hir_analysis/src/bounds.rs
index c7ee89e73c273..c30a6f1eeb910 100644
--- a/compiler/rustc_hir_analysis/src/bounds.rs
+++ b/compiler/rustc_hir_analysis/src/bounds.rs
@@ -7,7 +7,7 @@ use rustc_hir::LangItem;
 use rustc_middle::ty::fold::FnMutDelegate;
 use rustc_middle::ty::{self, Ty, TyCtxt, Upcast};
 use rustc_span::def_id::DefId;
-use rustc_span::{sym, Span};
+use rustc_span::Span;
 
 /// Collects together a list of type bounds. These lists of bounds occur in many places
 /// in Rust's syntax:
@@ -80,7 +80,7 @@ impl<'tcx> Bounds<'tcx> {
             }
 
             (_, ty::BoundConstness::NotConst) => {
-                if !tcx.has_attr(bound_trait_ref.def_id(), sym::const_trait) {
+                if !tcx.is_const_trait(bound_trait_ref.def_id()) {
                     return;
                 }
                 tcx.consts.true_
diff --git a/compiler/rustc_hir_analysis/src/check/check.rs b/compiler/rustc_hir_analysis/src/check/check.rs
index f93777eda529e..bf8ef18c04fcc 100644
--- a/compiler/rustc_hir_analysis/src/check/check.rs
+++ b/compiler/rustc_hir_analysis/src/check/check.rs
@@ -25,9 +25,9 @@ use rustc_middle::ty::{
 };
 use rustc_session::lint::builtin::{UNINHABITED_STATIC, UNSUPPORTED_CALLING_CONVENTIONS};
 use rustc_target::abi::FieldIdx;
+use rustc_trait_selection::error_reporting::traits::on_unimplemented::OnUnimplementedDirective;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits;
-use rustc_trait_selection::traits::error_reporting::on_unimplemented::OnUnimplementedDirective;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
 use rustc_type_ir::fold::TypeFoldable;
 
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
index 8a1ee9374c3d6..6c53625b590ba 100644
--- a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
+++ b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
@@ -21,9 +21,9 @@ use rustc_middle::ty::{
 use rustc_middle::ty::{GenericParamDefKind, TyCtxt};
 use rustc_middle::{bug, span_bug};
 use rustc_span::Span;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::regions::InferCtxtRegionExt;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
 use rustc_trait_selection::traits::{
     self, FulfillmentError, ObligationCause, ObligationCauseCode, ObligationCtxt, Reveal,
diff --git a/compiler/rustc_hir_analysis/src/check/entry.rs b/compiler/rustc_hir_analysis/src/check/entry.rs
index cc52a7658020f..ce921f64481a3 100644
--- a/compiler/rustc_hir_analysis/src/check/entry.rs
+++ b/compiler/rustc_hir_analysis/src/check/entry.rs
@@ -7,7 +7,7 @@ use rustc_session::config::EntryFnType;
 use rustc_span::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
 use rustc_span::{symbol::sym, Span};
 use rustc_target::spec::abi::Abi;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::{self, ObligationCause, ObligationCauseCode};
 
 use std::ops::Not;
diff --git a/compiler/rustc_hir_analysis/src/check/mod.rs b/compiler/rustc_hir_analysis/src/check/mod.rs
index 8469cbbbc7d61..6a36938dd1d51 100644
--- a/compiler/rustc_hir_analysis/src/check/mod.rs
+++ b/compiler/rustc_hir_analysis/src/check/mod.rs
@@ -96,10 +96,10 @@ use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::{def_id::CRATE_DEF_ID, BytePos, Span, Symbol, DUMMY_SP};
 use rustc_target::abi::VariantIdx;
 use rustc_target::spec::abi::Abi;
-use rustc_trait_selection::traits::error_reporting::suggestions::{
+use rustc_trait_selection::error_reporting::traits::suggestions::{
     ReturnsVisitor, TypeErrCtxtExt as _,
 };
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::ObligationCtxt;
 
 use crate::errors;
diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
index a0eede31eb07f..b2ef07d65c5b4 100644
--- a/compiler/rustc_hir_analysis/src/check/wfcheck.rs
+++ b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
@@ -29,8 +29,8 @@ use rustc_session::parse::feature_err;
 use rustc_span::symbol::{sym, Ident};
 use rustc_span::{Span, DUMMY_SP};
 use rustc_target::spec::abi::Abi;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::regions::InferCtxtRegionExt;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 use rustc_trait_selection::traits::misc::{
     type_allowed_to_implement_const_param_ty, ConstParamTyImplementationError,
 };
diff --git a/compiler/rustc_hir_analysis/src/coherence/builtin.rs b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
index 61adb7a3cbaeb..2ecb170ec8955 100644
--- a/compiler/rustc_hir_analysis/src/coherence/builtin.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
@@ -17,7 +17,7 @@ use rustc_middle::ty::adjustment::CoerceUnsizedInfo;
 use rustc_middle::ty::print::PrintTraitRefExt as _;
 use rustc_middle::ty::{self, suggest_constraining_type_params, Ty, TyCtxt, TypeVisitableExt};
 use rustc_span::{Span, DUMMY_SP};
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::traits::misc::{
     type_allowed_to_implement_const_param_ty, type_allowed_to_implement_copy,
     ConstParamTyImplementationError, CopyImplementationError, InfringingFieldsReason,
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index 843e4d41e001e..0acc119115a70 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -18,7 +18,9 @@ use rustc_ast::Recovered;
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
 use rustc_data_structures::unord::UnordMap;
-use rustc_errors::{struct_span_code_err, Applicability, Diag, ErrorGuaranteed, StashKey, E0228};
+use rustc_errors::{
+    struct_span_code_err, Applicability, Diag, DiagCtxtHandle, ErrorGuaranteed, StashKey, E0228,
+};
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::{self, walk_generics, Visitor};
@@ -35,8 +37,8 @@ use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{Span, DUMMY_SP};
 use rustc_target::abi::FieldIdx;
 use rustc_target::spec::abi;
+use rustc_trait_selection::error_reporting::traits::suggestions::NextTypeParamName;
 use rustc_trait_selection::infer::InferCtxtExt;
-use rustc_trait_selection::traits::error_reporting::suggestions::NextTypeParamName;
 use rustc_trait_selection::traits::ObligationCtxt;
 use std::cell::Cell;
 use std::iter;
@@ -161,7 +163,7 @@ pub struct CollectItemTypesVisitor<'tcx> {
 /// and suggest adding type parameters in the appropriate place, taking into consideration any and
 /// all already existing generic type parameters to avoid suggesting a name that is already in use.
 pub(crate) fn placeholder_type_error<'tcx>(
-    tcx: TyCtxt<'tcx>,
+    cx: &dyn HirTyLowerer<'tcx>,
     generics: Option<&hir::Generics<'_>>,
     placeholder_types: Vec<Span>,
     suggest: bool,
@@ -172,21 +174,21 @@ pub(crate) fn placeholder_type_error<'tcx>(
         return;
     }
 
-    placeholder_type_error_diag(tcx, generics, placeholder_types, vec![], suggest, hir_ty, kind)
+    placeholder_type_error_diag(cx, generics, placeholder_types, vec![], suggest, hir_ty, kind)
         .emit();
 }
 
-pub(crate) fn placeholder_type_error_diag<'tcx>(
-    tcx: TyCtxt<'tcx>,
+pub(crate) fn placeholder_type_error_diag<'cx, 'tcx>(
+    cx: &'cx dyn HirTyLowerer<'tcx>,
     generics: Option<&hir::Generics<'_>>,
     placeholder_types: Vec<Span>,
     additional_spans: Vec<Span>,
     suggest: bool,
     hir_ty: Option<&hir::Ty<'_>>,
     kind: &'static str,
-) -> Diag<'tcx> {
+) -> Diag<'cx> {
     if placeholder_types.is_empty() {
-        return bad_placeholder(tcx, additional_spans, kind);
+        return bad_placeholder(cx, additional_spans, kind);
     }
 
     let params = generics.map(|g| g.params).unwrap_or_default();
@@ -210,7 +212,7 @@ pub(crate) fn placeholder_type_error_diag<'tcx>(
     }
 
     let mut err =
-        bad_placeholder(tcx, placeholder_types.into_iter().chain(additional_spans).collect(), kind);
+        bad_placeholder(cx, placeholder_types.into_iter().chain(additional_spans).collect(), kind);
 
     // Suggest, but only if it is not a function in const or static
     if suggest {
@@ -224,7 +226,7 @@ pub(crate) fn placeholder_type_error_diag<'tcx>(
 
             // Check if parent is const or static
             is_const_or_static = matches!(
-                tcx.parent_hir_node(hir_ty.hir_id),
+                cx.tcx().parent_hir_node(hir_ty.hir_id),
                 Node::Item(&hir::Item {
                     kind: hir::ItemKind::Const(..) | hir::ItemKind::Static(..),
                     ..
@@ -267,7 +269,16 @@ fn reject_placeholder_type_signatures_in_item<'tcx>(
     let mut visitor = HirPlaceholderCollector::default();
     visitor.visit_item(item);
 
-    placeholder_type_error(tcx, Some(generics), visitor.0, suggest, None, item.kind.descr());
+    let icx = ItemCtxt::new(tcx, item.owner_id.def_id);
+
+    placeholder_type_error(
+        icx.lowerer(),
+        Some(generics),
+        visitor.0,
+        suggest,
+        None,
+        item.kind.descr(),
+    );
 }
 
 impl<'tcx> Visitor<'tcx> for CollectItemTypesVisitor<'tcx> {
@@ -329,15 +340,15 @@ impl<'tcx> Visitor<'tcx> for CollectItemTypesVisitor<'tcx> {
 ///////////////////////////////////////////////////////////////////////////
 // Utility types and common code for the above passes.
 
-fn bad_placeholder<'tcx>(
-    tcx: TyCtxt<'tcx>,
+fn bad_placeholder<'cx, 'tcx>(
+    cx: &'cx dyn HirTyLowerer<'tcx>,
     mut spans: Vec<Span>,
     kind: &'static str,
-) -> Diag<'tcx> {
+) -> Diag<'cx> {
     let kind = if kind.ends_with('s') { format!("{kind}es") } else { format!("{kind}s") };
 
     spans.sort();
-    tcx.dcx().create_err(errors::PlaceholderNotAllowedItemSignatures { spans, kind })
+    cx.dcx().create_err(errors::PlaceholderNotAllowedItemSignatures { spans, kind })
 }
 
 impl<'tcx> ItemCtxt<'tcx> {
@@ -370,6 +381,10 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
         self.tcx
     }
 
+    fn dcx(&self) -> DiagCtxtHandle<'_> {
+        self.tcx.dcx().taintable_handle(&self.tainted_by_errors)
+    }
+
     fn item_def_id(&self) -> LocalDefId {
         self.item_def_id
     }
@@ -377,14 +392,13 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
     fn re_infer(&self, span: Span, reason: RegionInferReason<'_>) -> ty::Region<'tcx> {
         if let RegionInferReason::BorrowedObjectLifetimeDefault = reason {
             let e = struct_span_code_err!(
-                self.tcx().dcx(),
+                self.dcx(),
                 span,
                 E0228,
                 "the lifetime bound for this object type cannot be deduced \
                 from context; please supply an explicit bound"
             )
             .emit();
-            self.set_tainted_by_errors(e);
             ty::Region::new_error(self.tcx(), e)
         } else {
             // This indicates an illegal lifetime in a non-assoc-trait position
@@ -509,10 +523,6 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
         None
     }
 
-    fn set_tainted_by_errors(&self, err: ErrorGuaranteed) {
-        self.tainted_by_errors.set(Some(err));
-    }
-
     fn lower_fn_sig(
         &self,
         decl: &hir::FnDecl<'tcx>,
@@ -570,7 +580,7 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
             // `ident_span` to not emit an error twice when we have `fn foo(_: fn() -> _)`.
 
             let mut diag = crate::collect::placeholder_type_error_diag(
-                tcx,
+                self,
                 generics,
                 visitor.0,
                 infer_replacements.iter().map(|(s, _)| *s).collect(),
@@ -590,7 +600,7 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
                 );
             }
 
-            self.set_tainted_by_errors(diag.emit());
+            diag.emit();
         }
 
         (input_tys, output_ty)
@@ -639,6 +649,7 @@ fn lower_item(tcx: TyCtxt<'_>, item_id: hir::ItemId) {
     let it = tcx.hir().item(item_id);
     debug!(item = %it.ident, id = %it.hir_id());
     let def_id = item_id.owner_id.def_id;
+    let icx = ItemCtxt::new(tcx, def_id);
 
     match &it.kind {
         // These don't define types.
@@ -663,7 +674,7 @@ fn lower_item(tcx: TyCtxt<'_>, item_id: hir::ItemId) {
                         let mut visitor = HirPlaceholderCollector::default();
                         visitor.visit_foreign_item(item);
                         placeholder_type_error(
-                            tcx,
+                            icx.lowerer(),
                             None,
                             visitor.0,
                             false,
@@ -742,7 +753,14 @@ fn lower_item(tcx: TyCtxt<'_>, item_id: hir::ItemId) {
             if !ty.is_suggestable_infer_ty() {
                 let mut visitor = HirPlaceholderCollector::default();
                 visitor.visit_item(it);
-                placeholder_type_error(tcx, None, visitor.0, false, None, it.kind.descr());
+                placeholder_type_error(
+                    icx.lowerer(),
+                    None,
+                    visitor.0,
+                    false,
+                    None,
+                    it.kind.descr(),
+                );
             }
         }
 
@@ -760,6 +778,7 @@ fn lower_trait_item(tcx: TyCtxt<'_>, trait_item_id: hir::TraitItemId) {
     let trait_item = tcx.hir().trait_item(trait_item_id);
     let def_id = trait_item_id.owner_id;
     tcx.ensure().generics_of(def_id);
+    let icx = ItemCtxt::new(tcx, def_id.def_id);
 
     match trait_item.kind {
         hir::TraitItemKind::Fn(..) => {
@@ -776,7 +795,14 @@ fn lower_trait_item(tcx: TyCtxt<'_>, trait_item_id: hir::TraitItemId) {
                 // Account for `const C: _;`.
                 let mut visitor = HirPlaceholderCollector::default();
                 visitor.visit_trait_item(trait_item);
-                placeholder_type_error(tcx, None, visitor.0, false, None, "associated constant");
+                placeholder_type_error(
+                    icx.lowerer(),
+                    None,
+                    visitor.0,
+                    false,
+                    None,
+                    "associated constant",
+                );
             }
         }
 
@@ -787,7 +813,7 @@ fn lower_trait_item(tcx: TyCtxt<'_>, trait_item_id: hir::TraitItemId) {
             // Account for `type T = _;`.
             let mut visitor = HirPlaceholderCollector::default();
             visitor.visit_trait_item(trait_item);
-            placeholder_type_error(tcx, None, visitor.0, false, None, "associated type");
+            placeholder_type_error(icx.lowerer(), None, visitor.0, false, None, "associated type");
         }
 
         hir::TraitItemKind::Type(_, None) => {
@@ -798,7 +824,7 @@ fn lower_trait_item(tcx: TyCtxt<'_>, trait_item_id: hir::TraitItemId) {
             let mut visitor = HirPlaceholderCollector::default();
             visitor.visit_trait_item(trait_item);
 
-            placeholder_type_error(tcx, None, visitor.0, false, None, "associated type");
+            placeholder_type_error(icx.lowerer(), None, visitor.0, false, None, "associated type");
         }
     };
 
@@ -811,6 +837,7 @@ fn lower_impl_item(tcx: TyCtxt<'_>, impl_item_id: hir::ImplItemId) {
     tcx.ensure().type_of(def_id);
     tcx.ensure().predicates_of(def_id);
     let impl_item = tcx.hir().impl_item(impl_item_id);
+    let icx = ItemCtxt::new(tcx, def_id.def_id);
     match impl_item.kind {
         hir::ImplItemKind::Fn(..) => {
             tcx.ensure().codegen_fn_attrs(def_id);
@@ -821,14 +848,21 @@ fn lower_impl_item(tcx: TyCtxt<'_>, impl_item_id: hir::ImplItemId) {
             let mut visitor = HirPlaceholderCollector::default();
             visitor.visit_impl_item(impl_item);
 
-            placeholder_type_error(tcx, None, visitor.0, false, None, "associated type");
+            placeholder_type_error(icx.lowerer(), None, visitor.0, false, None, "associated type");
         }
         hir::ImplItemKind::Const(ty, _) => {
             // Account for `const T: _ = ..;`
             if !ty.is_suggestable_infer_ty() {
                 let mut visitor = HirPlaceholderCollector::default();
                 visitor.visit_impl_item(impl_item);
-                placeholder_type_error(tcx, None, visitor.0, false, None, "associated constant");
+                placeholder_type_error(
+                    icx.lowerer(),
+                    None,
+                    visitor.0,
+                    false,
+                    None,
+                    "associated constant",
+                );
             }
         }
     }
@@ -1091,7 +1125,10 @@ fn lower_variant(
             vis: tcx.visibility(f.def_id),
         })
         .collect();
-    let recovered = matches!(def, hir::VariantData::Struct { recovered: Recovered::Yes(_), .. });
+    let recovered = match def {
+        hir::VariantData::Struct { recovered: Recovered::Yes(guar), .. } => Some(*guar),
+        _ => None,
+    };
     ty::VariantDef::new(
         ident.name,
         variant_did.map(LocalDefId::to_def_id),
@@ -1194,6 +1231,11 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
         _ => span_bug!(item.span, "trait_def_of_item invoked on non-trait"),
     };
 
+    let constness = if tcx.has_attr(def_id, sym::const_trait) {
+        hir::Constness::Const
+    } else {
+        hir::Constness::NotConst
+    };
     let paren_sugar = tcx.has_attr(def_id, sym::rustc_paren_sugar);
     if paren_sugar && !tcx.features().unboxed_closures {
         tcx.dcx().emit_err(errors::ParenSugarAttribute { span: item.span });
@@ -1349,6 +1391,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
     ty::TraitDef {
         def_id: def_id.to_def_id(),
         safety,
+        constness,
         paren_sugar,
         has_auto_impl: is_auto,
         is_marker,
@@ -1379,7 +1422,7 @@ fn fn_sig(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_, ty::PolyFn
             ..
         })
         | Item(hir::Item { kind: ItemKind::Fn(sig, generics, _), .. }) => {
-            infer_return_ty_for_fn_sig(tcx, sig, generics, def_id, &icx)
+            infer_return_ty_for_fn_sig(sig, generics, def_id, &icx)
         }
 
         ImplItem(hir::ImplItem { kind: ImplItemKind::Fn(sig, _), generics, .. }) => {
@@ -1396,7 +1439,7 @@ fn fn_sig(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_, ty::PolyFn
                     None,
                 )
             } else {
-                infer_return_ty_for_fn_sig(tcx, sig, generics, def_id, &icx)
+                infer_return_ty_for_fn_sig(sig, generics, def_id, &icx)
             }
         }
 
@@ -1449,12 +1492,12 @@ fn fn_sig(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_, ty::PolyFn
 }
 
 fn infer_return_ty_for_fn_sig<'tcx>(
-    tcx: TyCtxt<'tcx>,
     sig: &hir::FnSig<'tcx>,
     generics: &hir::Generics<'_>,
     def_id: LocalDefId,
     icx: &ItemCtxt<'tcx>,
 ) -> ty::PolyFnSig<'tcx> {
+    let tcx = icx.tcx;
     let hir_id = tcx.local_def_id_to_hir_id(def_id);
 
     match sig.decl.output.get_infer_ret_ty() {
@@ -1486,7 +1529,7 @@ fn infer_return_ty_for_fn_sig<'tcx>(
             let mut visitor = HirPlaceholderCollector::default();
             visitor.visit_ty(ty);
 
-            let mut diag = bad_placeholder(tcx, visitor.0, "return type");
+            let mut diag = bad_placeholder(icx.lowerer(), visitor.0, "return type");
             let ret_ty = fn_sig.output();
             // Don't leak types into signatures unless they're nameable!
             // For example, if a function returns itself, we don't want that
@@ -1682,7 +1725,7 @@ fn check_impl_constness(
     }
 
     let trait_def_id = hir_trait_ref.trait_def_id()?;
-    if tcx.has_attr(trait_def_id, sym::const_trait) {
+    if tcx.is_const_trait(trait_def_id) {
         return None;
     }
 
diff --git a/compiler/rustc_hir_analysis/src/collect/type_of.rs b/compiler/rustc_hir_analysis/src/collect/type_of.rs
index 1e2b0c4323385..974dd415f464c 100644
--- a/compiler/rustc_hir_analysis/src/collect/type_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/type_of.rs
@@ -12,6 +12,7 @@ use rustc_span::symbol::Ident;
 use rustc_span::{Span, DUMMY_SP};
 
 use crate::errors::TypeofReservedKeywordUsed;
+use crate::hir_ty_lowering::HirTyLowerer;
 
 use super::bad_placeholder;
 use super::ItemCtxt;
@@ -357,7 +358,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_
                 .and_then(|body_id| {
                     ty.is_suggestable_infer_ty().then(|| {
                         infer_placeholder_type(
-                            tcx,
+                            icx.lowerer(),
                             def_id,
                             body_id,
                             ty.span,
@@ -381,7 +382,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_
             ImplItemKind::Const(ty, body_id) => {
                 if ty.is_suggestable_infer_ty() {
                     infer_placeholder_type(
-                        tcx,
+                        icx.lowerer(),
                         def_id,
                         body_id,
                         ty.span,
@@ -405,7 +406,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_
             ItemKind::Static(ty, .., body_id) => {
                 if ty.is_suggestable_infer_ty() {
                     infer_placeholder_type(
-                        tcx,
+                        icx.lowerer(),
                         def_id,
                         body_id,
                         ty.span,
@@ -418,7 +419,14 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_
             }
             ItemKind::Const(ty, _, body_id) => {
                 if ty.is_suggestable_infer_ty() {
-                    infer_placeholder_type(tcx, def_id, body_id, ty.span, item.ident, "constant")
+                    infer_placeholder_type(
+                        icx.lowerer(),
+                        def_id,
+                        body_id,
+                        ty.span,
+                        item.ident,
+                        "constant",
+                    )
                 } else {
                     icx.lower_ty(ty)
                 }
@@ -559,21 +567,22 @@ pub(super) fn type_of_opaque(
     }
 }
 
-fn infer_placeholder_type<'a>(
-    tcx: TyCtxt<'a>,
+fn infer_placeholder_type<'tcx>(
+    cx: &dyn HirTyLowerer<'tcx>,
     def_id: LocalDefId,
     body_id: hir::BodyId,
     span: Span,
     item_ident: Ident,
     kind: &'static str,
-) -> Ty<'a> {
+) -> Ty<'tcx> {
+    let tcx = cx.tcx();
     let ty = tcx.diagnostic_only_typeck(def_id).node_type(body_id.hir_id);
 
     // If this came from a free `const` or `static mut?` item,
     // then the user may have written e.g. `const A = 42;`.
     // In this case, the parser has stashed a diagnostic for
     // us to improve in typeck so we do that now.
-    let guar = tcx
+    let guar = cx
         .dcx()
         .try_steal_modify_and_emit_err(span, StashKey::ItemNoType, |err| {
             if !ty.references_error() {
@@ -602,7 +611,7 @@ fn infer_placeholder_type<'a>(
             }
         })
         .unwrap_or_else(|| {
-            let mut diag = bad_placeholder(tcx, vec![span], kind);
+            let mut diag = bad_placeholder(cx, vec![span], kind);
 
             if !ty.references_error() {
                 if let Some(ty) = ty.make_suggestable(tcx, false, None) {
diff --git a/compiler/rustc_hir_analysis/src/errors.rs b/compiler/rustc_hir_analysis/src/errors.rs
index 7d44ac458de86..0ee87a13e9e37 100644
--- a/compiler/rustc_hir_analysis/src/errors.rs
+++ b/compiler/rustc_hir_analysis/src/errors.rs
@@ -9,6 +9,7 @@ use rustc_middle::ty::Ty;
 use rustc_span::{symbol::Ident, Span, Symbol};
 mod pattern_types;
 pub use pattern_types::*;
+pub mod wrong_number_of_generic_args;
 
 mod precise_captures;
 pub(crate) use precise_captures::*;
@@ -692,20 +693,6 @@ pub(crate) struct TypeOf<'tcx> {
     pub ty: Ty<'tcx>,
 }
 
-#[derive(Diagnostic)]
-#[diag(hir_analysis_pass_to_variadic_function, code = E0617)]
-pub(crate) struct PassToVariadicFunction<'tcx, 'a> {
-    #[primary_span]
-    pub span: Span,
-    pub ty: Ty<'tcx>,
-    pub cast_ty: &'a str,
-    #[suggestion(code = "{replace}", applicability = "machine-applicable")]
-    pub sugg_span: Option<Span>,
-    pub replace: String,
-    #[help]
-    pub help: Option<()>,
-}
-
 #[derive(Diagnostic)]
 #[diag(hir_analysis_invalid_union_field, code = E0740)]
 pub(crate) struct InvalidUnionField {
diff --git a/compiler/rustc_hir_analysis/src/structured_errors/wrong_number_of_generic_args.rs b/compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs
similarity index 96%
rename from compiler/rustc_hir_analysis/src/structured_errors/wrong_number_of_generic_args.rs
rename to compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs
index 5d435a8edf9ff..6426ad9dc184f 100644
--- a/compiler/rustc_hir_analysis/src/structured_errors/wrong_number_of_generic_args.rs
+++ b/compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs
@@ -1,8 +1,8 @@
-use crate::structured_errors::StructuredDiag;
-use rustc_errors::{codes::*, pluralize, Applicability, Diag, MultiSpan};
+use rustc_errors::{
+    codes::*, pluralize, Applicability, Diag, Diagnostic, EmissionGuarantee, MultiSpan,
+};
 use rustc_hir as hir;
 use rustc_middle::ty::{self as ty, AssocItems, AssocKind, TyCtxt};
-use rustc_session::Session;
 use rustc_span::def_id::DefId;
 use std::iter;
 
@@ -541,14 +541,8 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
         }
     }
 
-    fn start_diagnostics(&self) -> Diag<'tcx> {
-        let span = self.path_segment.ident.span;
-        let msg = self.create_error_message();
-        self.tcx.dcx().struct_span_err(span, msg).with_code(self.code())
-    }
-
     /// Builds the `expected 1 type argument / supplied 2 type arguments` message.
-    fn notify(&self, err: &mut Diag<'_>) {
+    fn notify(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         let (quantifier, bound) = self.get_quantifier_and_bound();
         let provided_args = self.num_provided_args();
 
@@ -600,7 +594,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
         }
     }
 
-    fn suggest(&self, err: &mut Diag<'_>) {
+    fn suggest(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         debug!(
             "suggest(self.provided {:?}, self.gen_args.span(): {:?})",
             self.num_provided_args(),
@@ -628,7 +622,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
     /// ```text
     /// type Map = HashMap<String>;
     /// ```
-    fn suggest_adding_args(&self, err: &mut Diag<'_>) {
+    fn suggest_adding_args(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         if self.gen_args.parenthesized != hir::GenericArgsParentheses::No {
             return;
         }
@@ -647,7 +641,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
         }
     }
 
-    fn suggest_adding_lifetime_args(&self, err: &mut Diag<'_>) {
+    fn suggest_adding_lifetime_args(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         debug!("suggest_adding_lifetime_args(path_segment: {:?})", self.path_segment);
         let num_missing_args = self.num_missing_lifetime_args();
         let num_params_to_take = num_missing_args;
@@ -701,7 +695,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
         }
     }
 
-    fn suggest_adding_type_and_const_args(&self, err: &mut Diag<'_>) {
+    fn suggest_adding_type_and_const_args(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         let num_missing_args = self.num_missing_type_or_const_args();
         let msg = format!("add missing {} argument{}", self.kind(), pluralize!(num_missing_args));
 
@@ -761,7 +755,10 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
     /// ```compile_fail
     /// Into::into::<Option<_>>(42) // suggests considering `Into::<Option<_>>::into(42)`
     /// ```
-    fn suggest_moving_args_from_assoc_fn_to_trait(&self, err: &mut Diag<'_>) {
+    fn suggest_moving_args_from_assoc_fn_to_trait(
+        &self,
+        err: &mut Diag<'_, impl EmissionGuarantee>,
+    ) {
         let trait_ = match self.tcx.trait_of_item(self.def_id) {
             Some(def_id) => def_id,
             None => return,
@@ -817,7 +814,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
 
     fn suggest_moving_args_from_assoc_fn_to_trait_for_qualified_path(
         &self,
-        err: &mut Diag<'_>,
+        err: &mut Diag<'_, impl EmissionGuarantee>,
         qpath: &'tcx hir::QPath<'tcx>,
         msg: String,
         num_assoc_fn_excess_args: usize,
@@ -850,7 +847,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
 
     fn suggest_moving_args_from_assoc_fn_to_trait_for_method_call(
         &self,
-        err: &mut Diag<'_>,
+        err: &mut Diag<'_, impl EmissionGuarantee>,
         trait_def_id: DefId,
         expr: &'tcx hir::Expr<'tcx>,
         msg: String,
@@ -904,7 +901,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
     /// ```text
     /// type Map = HashMap<String, String, String, String>;
     /// ```
-    fn suggest_removing_args_or_generics(&self, err: &mut Diag<'_>) {
+    fn suggest_removing_args_or_generics(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         let num_provided_lt_args = self.num_provided_lifetime_args();
         let num_provided_type_const_args = self.num_provided_type_or_const_args();
         let unbound_types = self.get_unbound_associated_types();
@@ -922,7 +919,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
         let provided_args_matches_unbound_traits =
             unbound_types.len() == num_redundant_type_or_const_args;
 
-        let remove_lifetime_args = |err: &mut Diag<'_>| {
+        let remove_lifetime_args = |err: &mut Diag<'_, _>| {
             let mut lt_arg_spans = Vec::new();
             let mut found_redundant = false;
             for arg in self.gen_args.args {
@@ -963,7 +960,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
             );
         };
 
-        let remove_type_or_const_args = |err: &mut Diag<'_>| {
+        let remove_type_or_const_args = |err: &mut Diag<'_, _>| {
             let mut gen_arg_spans = Vec::new();
             let mut found_redundant = false;
             for arg in self.gen_args.args {
@@ -1060,7 +1057,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
     }
 
     /// Builds the `type defined here` message.
-    fn show_definition(&self, err: &mut Diag<'_>) {
+    fn show_definition(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         let mut spans: MultiSpan = if let Some(def_span) = self.tcx.def_ident_span(self.def_id) {
             if self.tcx.sess.source_map().is_span_accessible(def_span) {
                 def_span.into()
@@ -1111,7 +1108,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
     }
 
     /// Add note if `impl Trait` is explicitly specified.
-    fn note_synth_provided(&self, err: &mut Diag<'_>) {
+    fn note_synth_provided(&self, err: &mut Diag<'_, impl EmissionGuarantee>) {
         if !self.is_synth_provided() {
             return;
         }
@@ -1120,17 +1117,16 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
     }
 }
 
-impl<'tcx> StructuredDiag<'tcx> for WrongNumberOfGenericArgs<'_, 'tcx> {
-    fn session(&self) -> &Session {
-        self.tcx.sess
-    }
-
-    fn code(&self) -> ErrCode {
-        E0107
-    }
-
-    fn diagnostic_common(&self) -> Diag<'tcx> {
-        let mut err = self.start_diagnostics();
+impl<'a, G: EmissionGuarantee> Diagnostic<'a, G> for WrongNumberOfGenericArgs<'_, '_> {
+    fn into_diag(
+        self,
+        dcx: rustc_errors::DiagCtxtHandle<'a>,
+        level: rustc_errors::Level,
+    ) -> Diag<'a, G> {
+        let msg = self.create_error_message();
+        let mut err = Diag::new(dcx, level, msg);
+        err.code(E0107);
+        err.span(self.path_segment.ident.span);
 
         self.notify(&mut err);
         self.suggest(&mut err);
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
index 802215b2843ee..a1feef9e15b7e 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
@@ -76,7 +76,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         }
 
         if unbounds.len() > 1 {
-            tcx.dcx().emit_err(errors::MultipleRelaxedDefaultBounds {
+            self.dcx().emit_err(errors::MultipleRelaxedDefaultBounds {
                 spans: unbounds.iter().map(|ptr| ptr.span).collect(),
             });
         }
@@ -90,7 +90,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 continue;
             }
             // There was a `?Trait` bound, but it was not `?Sized`; warn.
-            tcx.dcx().span_warn(
+            self.dcx().span_warn(
                 unbound.span,
                 "relaxing a default bound only does something for `?Sized`; \
                 all other traits are not bound by default",
@@ -310,7 +310,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         duplicates
             .entry(assoc_item.def_id)
             .and_modify(|prev_span| {
-                tcx.dcx().emit_err(errors::ValueOfAssociatedStructAlreadySpecified {
+                self.dcx().emit_err(errors::ValueOfAssociatedStructAlreadySpecified {
                     span: constraint.span,
                     prev_span: *prev_span,
                     item_name: constraint.ident,
@@ -338,7 +338,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         .into(),
                         ty::GenericParamDefKind::Type { .. } => {
                             let guar = *emitted_bad_param_err.get_or_insert_with(|| {
-                                tcx.dcx().emit_err(
+                                self.dcx().emit_err(
                                     crate::errors::ReturnTypeNotationIllegalParam::Type {
                                         span: path_span,
                                         param_span: tcx.def_span(param.def_id),
@@ -349,7 +349,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         }
                         ty::GenericParamDefKind::Const { .. } => {
                             let guar = *emitted_bad_param_err.get_or_insert_with(|| {
-                                tcx.dcx().emit_err(
+                                self.dcx().emit_err(
                                     crate::errors::ReturnTypeNotationIllegalParam::Const {
                                         span: path_span,
                                         param_span: tcx.def_span(param.def_id),
@@ -371,7 +371,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             {
                 alias_ty.into()
             } else {
-                return Err(tcx.dcx().emit_err(crate::errors::ReturnTypeNotationOnNonRpitit {
+                return Err(self.dcx().emit_err(crate::errors::ReturnTypeNotationOnNonRpitit {
                     span: constraint.span,
                     ty: tcx.liberate_late_bound_regions(assoc_item.def_id, output),
                     fn_span: tcx.hir().span_if_local(assoc_item.def_id),
@@ -417,7 +417,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 let ty = alias_term
                     .map_bound(|alias| tcx.type_of(alias.def_id).instantiate(tcx, alias.args));
                 let ty =
-                    check_assoc_const_binding_type(tcx, constraint.ident, ty, constraint.hir_id);
+                    check_assoc_const_binding_type(self, constraint.ident, ty, constraint.hir_id);
                 tcx.feed_anon_const_type(anon_const.def_id, ty::EarlyBinder::bind(ty));
             }
 
@@ -426,7 +426,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
         match constraint.kind {
             hir::AssocItemConstraintKind::Equality { .. } if let ty::AssocKind::Fn = assoc_kind => {
-                return Err(tcx.dcx().emit_err(crate::errors::ReturnTypeNotationEqualityBound {
+                return Err(self.dcx().emit_err(crate::errors::ReturnTypeNotationEqualityBound {
                     span: constraint.span,
                 }));
             }
@@ -462,7 +462,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     late_bound_in_term,
                     |br_name| {
                         struct_span_code_err!(
-                            tcx.dcx(),
+                            self.dcx(),
                             constraint.span,
                             E0582,
                             "binding for associated type `{}` references {}, \
@@ -519,7 +519,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 ///
 /// [^1]: <https://github.com/rust-lang/project-const-generics/issues/28>.
 fn check_assoc_const_binding_type<'tcx>(
-    tcx: TyCtxt<'tcx>,
+    cx: &dyn HirTyLowerer<'tcx>,
     assoc_const: Ident,
     ty: ty::Binder<'tcx, Ty<'tcx>>,
     hir_id: hir::HirId,
@@ -536,13 +536,14 @@ fn check_assoc_const_binding_type<'tcx>(
     }
 
     let mut collector = GenericParamAndBoundVarCollector {
-        tcx,
+        cx,
         params: Default::default(),
         vars: Default::default(),
         depth: ty::INNERMOST,
     };
     let mut guar = ty.visit_with(&mut collector).break_value();
 
+    let tcx = cx.tcx();
     let ty_note = ty
         .make_suggestable(tcx, false, None)
         .map(|ty| crate::errors::TyOfAssocConstBindingNote { assoc_const, ty });
@@ -556,7 +557,7 @@ fn check_assoc_const_binding_type<'tcx>(
     for index in collector.params {
         let param = generics.param_at(index as _, tcx);
         let is_self_param = param.name == rustc_span::symbol::kw::SelfUpper;
-        guar.get_or_insert(tcx.dcx().emit_err(crate::errors::ParamInTyOfAssocConstBinding {
+        guar.get_or_insert(cx.dcx().emit_err(crate::errors::ParamInTyOfAssocConstBinding {
             span: assoc_const.span,
             assoc_const,
             param_name: param.name,
@@ -574,7 +575,7 @@ fn check_assoc_const_binding_type<'tcx>(
         }));
     }
     for (var_def_id, var_name) in collector.vars {
-        guar.get_or_insert(tcx.dcx().emit_err(
+        guar.get_or_insert(cx.dcx().emit_err(
             crate::errors::EscapingBoundVarInTyOfAssocConstBinding {
                 span: assoc_const.span,
                 assoc_const,
@@ -590,14 +591,14 @@ fn check_assoc_const_binding_type<'tcx>(
     Ty::new_error(tcx, guar)
 }
 
-struct GenericParamAndBoundVarCollector<'tcx> {
-    tcx: TyCtxt<'tcx>,
+struct GenericParamAndBoundVarCollector<'a, 'tcx> {
+    cx: &'a dyn HirTyLowerer<'tcx>,
     params: FxIndexSet<u32>,
     vars: FxIndexSet<(DefId, Symbol)>,
     depth: ty::DebruijnIndex,
 }
 
-impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for GenericParamAndBoundVarCollector<'tcx> {
+impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for GenericParamAndBoundVarCollector<'_, 'tcx> {
     type Result = ControlFlow<ErrorGuaranteed>;
 
     fn visit_binder<T: TypeVisitable<TyCtxt<'tcx>>>(
@@ -620,7 +621,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for GenericParamAndBoundVarCollector<'tcx>
                     ty::BoundTyKind::Param(def_id, name) => (def_id, name),
                     ty::BoundTyKind::Anon => {
                         let reported = self
-                            .tcx
+                            .cx
                             .dcx()
                             .delayed_bug(format!("unexpected anon bound ty: {:?}", bt.var));
                         return ControlFlow::Break(reported);
@@ -643,7 +644,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for GenericParamAndBoundVarCollector<'tcx>
                     ty::BrNamed(def_id, name) => (def_id, name),
                     ty::BrAnon | ty::BrEnv => {
                         let guar = self
-                            .tcx
+                            .cx
                             .dcx()
                             .delayed_bug(format!("unexpected bound region kind: {:?}", br.kind));
                         return ControlFlow::Break(guar);
@@ -661,7 +662,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for GenericParamAndBoundVarCollector<'tcx>
                 self.params.insert(param.index);
             }
             ty::ConstKind::Bound(db, ty::BoundVar { .. }) if db >= self.depth => {
-                let guar = self.tcx.dcx().delayed_bug("unexpected escaping late-bound const var");
+                let guar = self.cx.dcx().delayed_bug("unexpected escaping late-bound const var");
                 return ControlFlow::Break(guar);
             }
             _ if ct.has_param() || ct.has_bound_vars() => return ct.super_visit_with(self),
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs
index 2d240699105d6..5e595488ea7a8 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs
@@ -4,7 +4,6 @@ use crate::errors::{
 };
 use crate::fluent_generated as fluent;
 use crate::hir_ty_lowering::HirTyLowerer;
-use crate::traits::error_reporting::report_object_safety_error;
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
 use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::unord::UnordMap;
@@ -12,9 +11,9 @@ use rustc_errors::MultiSpan;
 use rustc_errors::{
     codes::*, pluralize, struct_span_code_err, Applicability, Diag, ErrorGuaranteed,
 };
-use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::{self as hir, Node};
 use rustc_middle::bug;
 use rustc_middle::query::Key;
 use rustc_middle::ty::print::{PrintPolyTraitRefExt as _, PrintTraitRefExt as _};
@@ -27,6 +26,7 @@ use rustc_span::edit_distance::find_best_match_for_name;
 use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::BytePos;
 use rustc_span::{Span, Symbol, DUMMY_SP};
+use rustc_trait_selection::error_reporting::traits::report_object_safety_error;
 use rustc_trait_selection::traits::FulfillmentError;
 use rustc_trait_selection::traits::{
     object_safety_violations_for_assoc_item, TraitAliasExpansionInfo,
@@ -46,7 +46,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             return;
         }
 
-        self.tcx().dcx().emit_err(MissingTypeParams {
+        self.dcx().emit_err(MissingTypeParams {
             span,
             def_span: self.tcx().def_span(def_id),
             span_snippet: self.tcx().sess.source_map().span_to_snippet(span).ok(),
@@ -109,7 +109,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
         if is_impl {
             let trait_name = self.tcx().def_path_str(trait_def_id);
-            self.tcx().dcx().emit_err(ManualImplementation { span, trait_name });
+            self.dcx().emit_err(ManualImplementation { span, trait_name });
         }
     }
 
@@ -156,7 +156,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
         if is_dummy {
             err.label = Some(errors::AssocItemNotFoundLabel::NotFound { span });
-            return tcx.dcx().emit_err(err);
+            return self.dcx().emit_err(err);
         }
 
         let all_candidate_names: Vec<_> = all_candidates()
@@ -174,7 +174,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 assoc_kind: assoc_kind_str,
                 suggested_name,
             });
-            return tcx.dcx().emit_err(err);
+            return self.dcx().emit_err(err);
         }
 
         // If we didn't find a good item in the supertraits (or couldn't get
@@ -239,10 +239,10 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                             assoc_kind: assoc_kind_str,
                             suggested_name,
                         });
-                        return tcx.dcx().emit_err(err);
+                        return self.dcx().emit_err(err);
                     }
 
-                    let mut err = tcx.dcx().create_err(err);
+                    let mut err = self.dcx().create_err(err);
                     if suggest_constraining_type_param(
                         tcx,
                         generics,
@@ -264,7 +264,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     }
                     return err.emit();
                 }
-                return tcx.dcx().emit_err(err);
+                return self.dcx().emit_err(err);
             }
         }
 
@@ -291,7 +291,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             err.label = Some(errors::AssocItemNotFoundLabel::NotFound { span: assoc_name.span });
         }
 
-        tcx.dcx().emit_err(err)
+        self.dcx().emit_err(err)
     }
 
     fn complain_about_assoc_kind_mismatch(
@@ -347,7 +347,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             (ident.span, None, assoc_kind, assoc_item.kind)
         };
 
-        tcx.dcx().emit_err(errors::AssocKindMismatch {
+        self.dcx().emit_err(errors::AssocKindMismatch {
             span,
             expected: super::assoc_kind_str(expected),
             got: super::assoc_kind_str(got),
@@ -366,8 +366,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         traits: &[String],
         name: Symbol,
     ) -> ErrorGuaranteed {
-        let mut err =
-            struct_span_code_err!(self.tcx().dcx(), span, E0223, "ambiguous associated type");
+        let mut err = struct_span_code_err!(self.dcx(), span, E0223, "ambiguous associated type");
         if self
             .tcx()
             .resolutions(())
@@ -463,9 +462,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 }
             }
         }
-        let reported = err.emit();
-        self.set_tainted_by_errors(reported);
-        reported
+        err.emit()
     }
 
     pub(crate) fn complain_about_ambiguous_inherent_assoc_ty(
@@ -475,16 +472,14 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         span: Span,
     ) -> ErrorGuaranteed {
         let mut err = struct_span_code_err!(
-            self.tcx().dcx(),
+            self.dcx(),
             name.span,
             E0034,
             "multiple applicable items in scope"
         );
         err.span_label(name.span, format!("multiple `{name}` found"));
         self.note_ambiguous_inherent_assoc_ty(&mut err, candidates, span);
-        let reported = err.emit();
-        self.set_tainted_by_errors(reported);
-        reported
+        err.emit()
     }
 
     // FIXME(fmease): Heavily adapted from `rustc_hir_typeck::method::suggest`. Deduplicate.
@@ -576,7 +571,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             };
 
             let mut err = struct_span_code_err!(
-                tcx.dcx(),
+                self.dcx(),
                 name.span,
                 E0220,
                 "associated type `{name}` not found for `{self_ty}` in the current scope"
@@ -662,7 +657,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         bounds.sort();
         bounds.dedup();
 
-        let mut err = tcx.dcx().struct_span_err(
+        let mut err = self.dcx().struct_span_err(
             name.span,
             format!("the associated type `{name}` exists for `{self_ty}`, but its trait bounds were not satisfied")
         );
@@ -745,7 +740,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         if object_safety_violations {
             return;
         }
+
+        // related to issue #91997, turbofishes added only when in an expr or pat
+        let mut in_expr_or_pat = false;
         if let ([], [bound]) = (&potential_assoc_types[..], &trait_bounds) {
+            let grandparent = tcx.parent_hir_node(tcx.parent_hir_id(bound.trait_ref.hir_ref_id));
+            in_expr_or_pat = match grandparent {
+                Node::Expr(_) | Node::Pat(_) => true,
+                _ => false,
+            };
             match bound.trait_ref.path.segments {
                 // FIXME: `trait_ref.path.span` can point to a full path with multiple
                 // segments, even though `trait_ref.path.segments` is of length `1`. Work
@@ -829,7 +832,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
         trait_bound_spans.sort();
         let mut err = struct_span_code_err!(
-            tcx.dcx(),
+            self.dcx(),
             trait_bound_spans,
             E0191,
             "the value of the associated type{} {} must be specified",
@@ -901,6 +904,10 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     // `Trait<'a, Item = Type>` while accounting for the `<'a>` in the
                     // suggestion.
                     format!("{}, {}>", &snippet[..snippet.len() - 1], types.join(", "))
+                } else if in_expr_or_pat {
+                    // The user wrote `Iterator`, so we don't have a type we can suggest, but at
+                    // least we can clue them to the correct syntax `Iterator::<Item = Type>`.
+                    format!("{}::<{}>", snippet, types.join(", "))
                 } else {
                     // The user wrote `Iterator`, so we don't have a type we can suggest, but at
                     // least we can clue them to the correct syntax `Iterator<Item = Type>`.
@@ -974,7 +981,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             }
         }
 
-        self.set_tainted_by_errors(err.emit());
+        err.emit();
     }
 
     /// On ambiguous associated type, look for an associated function whose name matches the
@@ -1011,17 +1018,14 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 .filter_by_name_unhygienic(Symbol::intern(&name))
                 .next()
         {
-            let reported =
-                struct_span_code_err!(tcx.dcx(), span, E0223, "ambiguous associated type")
-                    .with_span_suggestion_verbose(
-                        ident2.span.to(ident3.span),
-                        format!("there is an associated function with a similar name: `{name}`"),
-                        name,
-                        Applicability::MaybeIncorrect,
-                    )
-                    .emit();
-            self.set_tainted_by_errors(reported);
-            Err(reported)
+            Err(struct_span_code_err!(self.dcx(), span, E0223, "ambiguous associated type")
+                .with_span_suggestion_verbose(
+                    ident2.span.to(ident3.span),
+                    format!("there is an associated function with a similar name: `{name}`"),
+                    name,
+                    Applicability::MaybeIncorrect,
+                )
+                .emit())
         } else {
             Ok(())
         }
@@ -1120,7 +1124,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         let last_span = *arg_spans.last().unwrap();
         let span: MultiSpan = arg_spans.into();
         let mut err = struct_span_code_err!(
-            self.tcx().dcx(),
+            self.dcx(),
             span,
             E0109,
             "{kind} arguments are not allowed on {this_type}",
@@ -1130,20 +1134,17 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             err.span_label(span, format!("not allowed on {what}"));
         }
         generics_args_err_extend(self.tcx(), segments, &mut err, err_extend);
-        let reported = err.emit();
-        self.set_tainted_by_errors(reported);
-        reported
+        err.emit()
     }
 
     pub fn report_trait_object_addition_traits_error(
         &self,
         regular_traits: &Vec<TraitAliasExpansionInfo<'_>>,
     ) -> ErrorGuaranteed {
-        let tcx = self.tcx();
         let first_trait = &regular_traits[0];
         let additional_trait = &regular_traits[1];
         let mut err = struct_span_code_err!(
-            tcx.dcx(),
+            self.dcx(),
             additional_trait.bottom().1,
             E0225,
             "only auto traits can be used as additional traits in a trait object"
@@ -1169,9 +1170,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
              for more information on them, visit \
              <https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits>",
         );
-        let reported = err.emit();
-        self.set_tainted_by_errors(reported);
-        reported
+        err.emit()
     }
 
     pub fn report_trait_object_with_no_traits_error(
@@ -1185,20 +1184,19 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             .map(|&(trait_ref, _)| trait_ref.def_id())
             .find(|&trait_ref| tcx.is_trait_alias(trait_ref))
             .map(|trait_ref| tcx.def_span(trait_ref));
-        let reported =
-            tcx.dcx().emit_err(TraitObjectDeclaredWithNoTraits { span, trait_alias_span });
-        self.set_tainted_by_errors(reported);
-        reported
+
+        self.dcx().emit_err(TraitObjectDeclaredWithNoTraits { span, trait_alias_span })
     }
 }
 
 /// Emit an error for the given associated item constraint.
 pub fn prohibit_assoc_item_constraint(
-    tcx: TyCtxt<'_>,
+    cx: &dyn HirTyLowerer<'_>,
     constraint: &hir::AssocItemConstraint<'_>,
     segment: Option<(DefId, &hir::PathSegment<'_>, Span)>,
 ) -> ErrorGuaranteed {
-    let mut err = tcx.dcx().create_err(AssocItemConstraintsNotAllowedHere {
+    let tcx = cx.tcx();
+    let mut err = cx.dcx().create_err(AssocItemConstraintsNotAllowedHere {
         span: constraint.span,
         fn_trait_expansion: if let Some((_, segment, span)) = segment
             && segment.args().parenthesized == hir::GenericArgsParentheses::ParenSugar
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
index e92c377f0ce2a..b1c77db9f3700 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
@@ -1,9 +1,9 @@
-use super::IsMethodCall;
+use super::{HirTyLowerer, IsMethodCall};
+use crate::errors::wrong_number_of_generic_args::{GenericArgsInfo, WrongNumberOfGenericArgs};
 use crate::hir_ty_lowering::{
     errors::prohibit_assoc_item_constraint, ExplicitLateBound, GenericArgCountMismatch,
     GenericArgCountResult, GenericArgPosition, GenericArgsLowerer,
 };
-use crate::structured_errors::{GenericArgsInfo, StructuredDiag, WrongNumberOfGenericArgs};
 use rustc_ast::ast::ParamKindOrd;
 use rustc_errors::{
     codes::*, struct_span_code_err, Applicability, Diag, ErrorGuaranteed, MultiSpan,
@@ -13,7 +13,7 @@ use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::GenericArg;
 use rustc_middle::ty::{
-    self, GenericArgsRef, GenericParamDef, GenericParamDefKind, IsSuggestable, Ty, TyCtxt,
+    self, GenericArgsRef, GenericParamDef, GenericParamDefKind, IsSuggestable, Ty,
 };
 use rustc_session::lint::builtin::LATE_BOUND_LIFETIME_ARGUMENTS;
 use rustc_span::symbol::{kw, sym};
@@ -22,15 +22,16 @@ use smallvec::SmallVec;
 /// Report an error that a generic argument did not match the generic parameter that was
 /// expected.
 fn generic_arg_mismatch_err(
-    tcx: TyCtxt<'_>,
+    cx: &dyn HirTyLowerer<'_>,
     arg: &GenericArg<'_>,
     param: &GenericParamDef,
     possible_ordering_error: bool,
     help: Option<String>,
 ) -> ErrorGuaranteed {
+    let tcx = cx.tcx();
     let sess = tcx.sess;
     let mut err = struct_span_code_err!(
-        tcx.dcx(),
+        cx.dcx(),
         arg.span(),
         E0747,
         "{} provided when a {} was expected",
@@ -171,7 +172,7 @@ fn generic_arg_mismatch_err(
 /// - `inferred_kind`: if no parameter was provided, and inference
 ///   is enabled, then creates a suitable inference variable.
 pub fn lower_generic_args<'tcx: 'a, 'a>(
-    tcx: TyCtxt<'tcx>,
+    cx: &dyn HirTyLowerer<'tcx>,
     def_id: DefId,
     parent_args: &[ty::GenericArg<'tcx>],
     has_self: bool,
@@ -179,6 +180,7 @@ pub fn lower_generic_args<'tcx: 'a, 'a>(
     arg_count: &GenericArgCountResult,
     ctx: &mut impl GenericArgsLowerer<'a, 'tcx>,
 ) -> GenericArgsRef<'tcx> {
+    let tcx = cx.tcx();
     // Collect the segments of the path; we need to instantiate arguments
     // for parameters throughout the entire path (wherever there are
     // generic parameters).
@@ -326,7 +328,7 @@ pub fn lower_generic_args<'tcx: 'a, 'a>(
                                 param_types_present.dedup();
 
                                 generic_arg_mismatch_err(
-                                    tcx,
+                                    cx,
                                     arg,
                                     param,
                                     !args_iter.clone().is_sorted_by_key(|arg| arg.to_ord()),
@@ -381,7 +383,7 @@ pub fn lower_generic_args<'tcx: 'a, 'a>(
                         assert_eq!(kind, "lifetime");
                         let (provided_arg, param) =
                             force_infer_lt.expect("lifetimes ought to have been inferred");
-                        generic_arg_mismatch_err(tcx, provided_arg, param, false, None);
+                        generic_arg_mismatch_err(cx, provided_arg, param, false, None);
                     }
 
                     break;
@@ -405,7 +407,7 @@ pub fn lower_generic_args<'tcx: 'a, 'a>(
 /// Checks that the correct number of generic arguments have been provided.
 /// Used specifically for function calls.
 pub fn check_generic_arg_count_for_call(
-    tcx: TyCtxt<'_>,
+    cx: &dyn HirTyLowerer<'_>,
     def_id: DefId,
     generics: &ty::Generics,
     seg: &hir::PathSegment<'_>,
@@ -416,14 +418,14 @@ pub fn check_generic_arg_count_for_call(
         IsMethodCall::No => GenericArgPosition::Value,
     };
     let has_self = generics.parent.is_none() && generics.has_self;
-    check_generic_arg_count(tcx, def_id, seg, generics, gen_pos, has_self)
+    check_generic_arg_count(cx, def_id, seg, generics, gen_pos, has_self)
 }
 
 /// Checks that the correct number of generic arguments have been provided.
 /// This is used both for datatypes and function calls.
-#[instrument(skip(tcx, gen_pos), level = "debug")]
+#[instrument(skip(cx, gen_pos), level = "debug")]
 pub(crate) fn check_generic_arg_count(
-    tcx: TyCtxt<'_>,
+    cx: &dyn HirTyLowerer<'_>,
     def_id: DefId,
     seg: &hir::PathSegment<'_>,
     gen_params: &ty::Generics,
@@ -456,11 +458,11 @@ pub(crate) fn check_generic_arg_count(
     if gen_pos != GenericArgPosition::Type
         && let Some(c) = gen_args.constraints.first()
     {
-        prohibit_assoc_item_constraint(tcx, c, None);
+        prohibit_assoc_item_constraint(cx, c, None);
     }
 
     let explicit_late_bound =
-        prohibit_explicit_late_bound_lifetimes(tcx, gen_params, gen_args, gen_pos);
+        prohibit_explicit_late_bound_lifetimes(cx, gen_params, gen_args, gen_pos);
 
     let mut invalid_args = vec![];
 
@@ -486,17 +488,15 @@ pub(crate) fn check_generic_arg_count(
             GenericArgsInfo::MissingLifetimes { num_missing_args }
         };
 
-        let reported = WrongNumberOfGenericArgs::new(
-            tcx,
+        let reported = cx.dcx().emit_err(WrongNumberOfGenericArgs::new(
+            cx.tcx(),
             gen_args_info,
             seg,
             gen_params,
             has_self as usize,
             gen_args,
             def_id,
-        )
-        .diagnostic()
-        .emit();
+        ));
 
         Err(reported)
     };
@@ -573,17 +573,17 @@ pub(crate) fn check_generic_arg_count(
         debug!(?gen_args_info);
 
         let reported = gen_args.has_err().unwrap_or_else(|| {
-            WrongNumberOfGenericArgs::new(
-                tcx,
-                gen_args_info,
-                seg,
-                gen_params,
-                params_offset,
-                gen_args,
-                def_id,
-            )
-            .diagnostic()
-            .emit_unless(all_params_are_binded)
+            cx.dcx()
+                .create_err(WrongNumberOfGenericArgs::new(
+                    cx.tcx(),
+                    gen_args_info,
+                    seg,
+                    gen_params,
+                    params_offset,
+                    gen_args,
+                    def_id,
+                ))
+                .emit_unless(all_params_are_binded)
         });
 
         Err(reported)
@@ -623,7 +623,7 @@ pub(crate) fn check_generic_arg_count(
 /// Prohibits explicit lifetime arguments if late-bound lifetime parameters
 /// are present. This is used both for datatypes and function calls.
 pub(crate) fn prohibit_explicit_late_bound_lifetimes(
-    tcx: TyCtxt<'_>,
+    cx: &dyn HirTyLowerer<'_>,
     def: &ty::Generics,
     args: &hir::GenericArgs<'_>,
     position: GenericArgPosition,
@@ -644,13 +644,13 @@ pub(crate) fn prohibit_explicit_late_bound_lifetimes(
         if position == GenericArgPosition::Value
             && args.num_lifetime_params() != param_counts.lifetimes
         {
-            struct_span_code_err!(tcx.dcx(), span, E0794, "{}", msg)
+            struct_span_code_err!(cx.dcx(), span, E0794, "{}", msg)
                 .with_span_note(span_late, note)
                 .emit();
         } else {
             let mut multispan = MultiSpan::from_span(span);
             multispan.push_span_label(span_late, note);
-            tcx.node_span_lint(
+            cx.tcx().node_span_lint(
                 LATE_BOUND_LIFETIME_ARGUMENTS,
                 args.args[0].hir_id(),
                 multispan,
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs
index 240a749de96a6..29c71c3fa50b5 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/lint.rs
@@ -4,7 +4,7 @@ use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_lint_defs::{builtin::BARE_TRAIT_OBJECTS, Applicability};
 use rustc_span::Span;
-use rustc_trait_selection::traits::error_reporting::suggestions::NextTypeParamName;
+use rustc_trait_selection::error_reporting::traits::suggestions::NextTypeParamName;
 
 use super::HirTyLowerer;
 
@@ -60,7 +60,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             let msg = "trait objects must include the `dyn` keyword";
             let label = "add `dyn` keyword before this trait";
             let mut diag =
-                rustc_errors::struct_span_code_err!(tcx.dcx(), self_ty.span, E0782, "{}", msg);
+                rustc_errors::struct_span_code_err!(self.dcx(), self_ty.span, E0782, "{}", msg);
             if self_ty.span.can_be_used_for_suggestions()
                 && !self.maybe_suggest_impl_trait(self_ty, &mut diag)
             {
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
index 02db0352daafa..a665306f2c6a8 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -28,7 +28,8 @@ use crate::require_c_abi_if_c_variadic;
 use rustc_ast::TraitObjectSyntax;
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
 use rustc_errors::{
-    codes::*, struct_span_code_err, Applicability, Diag, ErrorGuaranteed, FatalError,
+    codes::*, struct_span_code_err, Applicability, Diag, DiagCtxtHandle, ErrorGuaranteed,
+    FatalError,
 };
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Namespace, Res};
@@ -47,7 +48,7 @@ use rustc_middle::{bug, span_bug};
 use rustc_session::lint::builtin::AMBIGUOUS_ASSOCIATED_ITEMS;
 use rustc_span::edit_distance::find_best_match_for_name;
 use rustc_span::symbol::{kw, Ident, Symbol};
-use rustc_span::{sym, Span, DUMMY_SP};
+use rustc_span::{Span, DUMMY_SP};
 use rustc_target::spec::abi;
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits::wf::object_region_bounds;
@@ -102,6 +103,8 @@ pub enum RegionInferReason<'a> {
 pub trait HirTyLowerer<'tcx> {
     fn tcx(&self) -> TyCtxt<'tcx>;
 
+    fn dcx(&self) -> DiagCtxtHandle<'_>;
+
     /// Returns the [`LocalDefId`] of the overarching item whose constituents get lowered.
     fn item_def_id(&self) -> LocalDefId;
 
@@ -177,12 +180,6 @@ pub trait HirTyLowerer<'tcx> {
     /// The inference context of the lowering context if applicable.
     fn infcx(&self) -> Option<&InferCtxt<'tcx>>;
 
-    /// Taint the context with errors.
-    ///
-    /// Invoke this when you encounter an error from some prior pass like name resolution.
-    /// This is used to help suppress derived errors typeck might otherwise report.
-    fn set_tainted_by_errors(&self, e: ErrorGuaranteed);
-
     /// Convenience method for coercing the lowering context into a trait object type.
     ///
     /// Most lowering routines are defined on the trait object type directly
@@ -323,7 +320,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             ty::BoundConstness::NotConst,
         );
         if let Some(c) = item_segment.args().constraints.first() {
-            prohibit_assoc_item_constraint(self.tcx(), c, Some((def_id, item_segment, span)));
+            prohibit_assoc_item_constraint(self, c, Some((def_id, item_segment, span)));
         }
         args
     }
@@ -394,7 +391,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         }
 
         let mut arg_count = check_generic_arg_count(
-            tcx,
+            self,
             def_id,
             segment,
             generics,
@@ -402,10 +399,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             self_ty.is_some(),
         );
 
-        if let Err(err) = &arg_count.correct {
-            self.set_tainted_by_errors(err.reported);
-        }
-
         // Skip processing if type has no generic parameters.
         // Traits always have `Self` as a generic parameter, which means they will not return early
         // here and so associated item constraints will be handled regardless of whether there are
@@ -560,13 +553,12 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         }
         if let ty::BoundConstness::Const | ty::BoundConstness::ConstIfConst = constness
             && generics.has_self
-            && !tcx.has_attr(def_id, sym::const_trait)
+            && !tcx.is_const_trait(def_id)
         {
-            let reported = tcx.dcx().emit_err(crate::errors::ConstBoundForNonConstTrait {
+            let reported = self.dcx().emit_err(crate::errors::ConstBoundForNonConstTrait {
                 span,
                 modifier: constness.as_str(),
             });
-            self.set_tainted_by_errors(reported);
             arg_count.correct = Err(GenericArgCountMismatch { reported, invalid_args: vec![] });
         }
 
@@ -579,7 +571,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             incorrect_args: &arg_count.correct,
         };
         let args = lower_generic_args(
-            tcx,
+            self,
             def_id,
             parent_args,
             self_ty.is_some(),
@@ -609,7 +601,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             ty::BoundConstness::NotConst,
         );
         if let Some(c) = item_segment.args().constraints.first() {
-            prohibit_assoc_item_constraint(self.tcx(), c, Some((item_def_id, item_segment, span)));
+            prohibit_assoc_item_constraint(self, c, Some((item_def_id, item_segment, span)));
         }
         args
     }
@@ -715,7 +707,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             // would not be well-formed!
             if polarity != ty::PredicatePolarity::Positive {
                 assert!(
-                    self.tcx().dcx().has_errors().is_some(),
+                    self.dcx().has_errors().is_some(),
                     "negative trait bounds should not have assoc item constraints",
                 );
                 continue;
@@ -761,11 +753,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             constness,
         );
         if let Some(c) = trait_segment.args().constraints.first() {
-            prohibit_assoc_item_constraint(
-                self.tcx(),
-                c,
-                Some((trait_def_id, trait_segment, span)),
-            );
+            prohibit_assoc_item_constraint(self, c, Some((trait_def_id, trait_segment, span)));
         }
         ty::TraitRef::new_from_args(self.tcx(), trait_def_id, generic_args)
     }
@@ -877,7 +865,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 span,
                 constraint,
             );
-            self.set_tainted_by_errors(reported);
             return Err(reported);
         };
         debug!(?bound);
@@ -887,7 +874,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
             let assoc_kind_str = assoc_kind_str(assoc_kind);
             let ty_param_name = &ty_param_name.to_string();
-            let mut err = tcx.dcx().create_err(crate::errors::AmbiguousAssocItem {
+            let mut err = self.dcx().create_err(crate::errors::AmbiguousAssocItem {
                 span,
                 assoc_kind: assoc_kind_str,
                 assoc_name,
@@ -960,7 +947,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 ));
             }
             let reported = err.emit();
-            self.set_tainted_by_errors(reported);
             if !where_bounds.is_empty() {
                 return Err(reported);
             }
@@ -1059,7 +1045,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 // trait reference.
                 let Some(trait_ref) = tcx.impl_trait_ref(impl_def_id) else {
                     // A cycle error occurred, most likely.
-                    tcx.dcx().span_bug(span, "expected cycle error");
+                    self.dcx().span_bug(span, "expected cycle error");
                 };
 
                 self.probe_single_bound_for_assoc_item(
@@ -1089,10 +1075,10 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 let reported = if variant_resolution.is_some() {
                     // Variant in type position
                     let msg = format!("expected type, found variant `{assoc_ident}`");
-                    tcx.dcx().span_err(span, msg)
+                    self.dcx().span_err(span, msg)
                 } else if qself_ty.is_enum() {
                     let mut err = struct_span_code_err!(
-                        tcx.dcx(),
+                        self.dcx(),
                         assoc_ident.span,
                         E0599,
                         "no variant named `{}` found for enum `{}`",
@@ -1133,7 +1119,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 } else if let ty::Alias(ty::Opaque, alias_ty) = qself_ty.kind() {
                     // `<impl Trait as OtherTrait>::Assoc` makes no sense.
                     struct_span_code_err!(
-                        tcx.dcx(),
+                        self.dcx(),
                         tcx.def_span(alias_ty.def_id),
                         E0667,
                         "`impl Trait` is not allowed in path parameters"
@@ -1153,7 +1139,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         assoc_ident.name,
                     )
                 };
-                self.set_tainted_by_errors(reported);
                 return Err(reported);
             }
         };
@@ -1404,13 +1389,12 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         let tcx = self.tcx();
 
         if !tcx.visibility(item_def_id).is_accessible_from(scope, tcx) {
-            let reported = tcx.dcx().emit_err(crate::errors::AssocItemIsPrivate {
+            self.dcx().emit_err(crate::errors::AssocItemIsPrivate {
                 span,
                 kind: tcx.def_descr(item_def_id),
                 name: ident,
                 defined_here_label: tcx.def_span(item_def_id),
             });
-            self.set_tainted_by_errors(reported);
         }
 
         tcx.check_stability(item_def_id, Some(block), span, None);
@@ -1564,7 +1548,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         for segment in segments {
             // Only emit the first error to avoid overloading the user with error messages.
             if let Some(c) = segment.args().constraints.first() {
-                return Err(prohibit_assoc_item_constraint(self.tcx(), c, None));
+                return Err(prohibit_assoc_item_constraint(self, c, None));
             }
         }
 
@@ -1824,7 +1808,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 // `AlwaysApplicable` impl needs a `T: ?Sized` bound for
                 // this to compile if we were to normalize here.
                 if forbid_generic && ty.has_param() {
-                    let mut err = tcx.dcx().struct_span_err(
+                    let mut err = self.dcx().struct_span_err(
                         path.span,
                         "generic `Self` types are currently not permitted in anonymous constants",
                     );
@@ -1836,7 +1820,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         err.span_note(impl_.self_ty.span, "not a concrete type");
                     }
                     let reported = err.emit();
-                    self.set_tainted_by_errors(reported);
                     Ty::new_error(tcx, reported)
                 } else {
                     ty
@@ -1848,19 +1831,13 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     path.segments[..path.segments.len() - 2].iter(),
                     GenericsArgsErrExtend::None,
                 );
-                // HACK: until we support `<Type as ~const Trait>`, assume all of them are.
-                let constness = if tcx.has_attr(tcx.parent(def_id), sym::const_trait) {
-                    ty::BoundConstness::ConstIfConst
-                } else {
-                    ty::BoundConstness::NotConst
-                };
                 self.lower_qpath(
                     span,
                     opt_self_ty,
                     def_id,
                     &path.segments[path.segments.len() - 2],
                     path.segments.last().unwrap(),
-                    constness,
+                    ty::BoundConstness::NotConst,
                 )
             }
             Res::PrimTy(prim_ty) => {
@@ -1883,7 +1860,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     .tcx()
                     .dcx()
                     .span_delayed_bug(path.span, "path with `Res::Err` but no error emitted");
-                self.set_tainted_by_errors(e);
                 Ty::new_error(self.tcx(), e)
             }
             Res::Def(..) => {
@@ -1894,7 +1870,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 );
                 Ty::new_error(
                     self.tcx(),
-                    self.tcx().dcx().span_delayed_bug(span, "incorrect resolution for `Self`"),
+                    self.dcx().span_delayed_bug(span, "incorrect resolution for `Self`"),
                 )
             }
             _ => span_bug!(span, "unexpected resolution: {:?}", path.res),
@@ -1967,7 +1943,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         let sig_span = self.tcx().def_span(sig_id);
         let mut try_emit = |descr| {
             if emit {
-                self.tcx().dcx().emit_err(crate::errors::NotSupportedDelegation {
+                self.dcx().emit_err(crate::errors::NotSupportedDelegation {
                     span,
                     descr,
                     callee_span: sig_span,
@@ -2017,8 +1993,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
     ) -> Ty<'tcx> {
         if self.check_delegation_constraints(sig_id, span, idx == hir::InferDelegationKind::Output)
         {
-            let e = self.tcx().dcx().span_delayed_bug(span, "not supported delegation case");
-            self.set_tainted_by_errors(e);
+            let e = self.dcx().span_delayed_bug(span, "not supported delegation case");
             return Ty::new_error(self.tcx(), e);
         };
         let sig = self.tcx().fn_sig(sig_id);
@@ -2183,7 +2158,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 let ty = self.lower_ty(ty);
                 let pat_ty = match pat.kind {
                     hir::PatKind::Wild => {
-                        let err = tcx.dcx().emit_err(WildPatTy { span: pat.span });
+                        let err = self.dcx().emit_err(WildPatTy { span: pat.span });
                         Ty::new_error(tcx, err)
                     }
                     hir::PatKind::Range(start, end, include_end) => {
@@ -2363,7 +2338,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
         self.validate_late_bound_regions(late_bound_in_args, late_bound_in_ret, |br_name| {
             struct_span_code_err!(
-                tcx.dcx(),
+                self.dcx(),
                 decl.output.span(),
                 E0581,
                 "return type references {}, which is not constrained by the fn input types",
@@ -2414,11 +2389,11 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
     }
 
     #[instrument(level = "trace", skip(self, generate_err))]
-    fn validate_late_bound_regions(
-        &self,
+    fn validate_late_bound_regions<'cx>(
+        &'cx self,
         constrained_regions: FxHashSet<ty::BoundRegionKind>,
         referenced_regions: FxHashSet<ty::BoundRegionKind>,
-        generate_err: impl Fn(&str) -> Diag<'tcx>,
+        generate_err: impl Fn(&str) -> Diag<'cx>,
     ) {
         for br in referenced_regions.difference(&constrained_regions) {
             let br_name = match *br {
@@ -2443,7 +2418,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                 err.note("consider introducing a named lifetime parameter");
             }
 
-            self.set_tainted_by_errors(err.emit());
+            err.emit();
         }
     }
 
@@ -2484,7 +2459,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
         // error.
         let r = derived_region_bounds[0];
         if derived_region_bounds[1..].iter().any(|r1| r != *r1) {
-            self.set_tainted_by_errors(tcx.dcx().emit_err(AmbiguousLifetimeBound { span }));
+            self.dcx().emit_err(AmbiguousLifetimeBound { span });
         }
         Some(r)
     }
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs
index df69c1938dd75..aafadc7f9cbea 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs
@@ -13,7 +13,7 @@ use rustc_middle::ty::fold::BottomUpFolder;
 use rustc_middle::ty::{self, ExistentialPredicateStableCmpExt as _, Ty, TyCtxt, TypeFoldable};
 use rustc_middle::ty::{DynKind, Upcast};
 use rustc_span::{ErrorGuaranteed, Span};
-use rustc_trait_selection::traits::error_reporting::report_object_safety_error;
+use rustc_trait_selection::error_reporting::traits::report_object_safety_error;
 use rustc_trait_selection::traits::{self, hir_ty_lowering_object_safety_violations};
 
 use smallvec::{smallvec, SmallVec};
@@ -236,7 +236,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                             Ty::new_misc_error(tcx).into()
                         } else if arg.walk().any(|arg| arg == dummy_self.into()) {
                             references_self = true;
-                            let guar = tcx.dcx().span_delayed_bug(
+                            let guar = self.dcx().span_delayed_bug(
                                 span,
                                 "trait object trait bounds reference `Self`",
                             );
@@ -262,8 +262,8 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
 
                 if references_self {
                     let def_id = i.bottom().0.def_id();
-                    let reported = struct_span_code_err!(
-                        tcx.dcx(),
+                    struct_span_code_err!(
+                        self.dcx(),
                         i.bottom().1,
                         E0038,
                         "the {} `{}` cannot be made into an object",
@@ -275,7 +275,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                             .error_msg(),
                     )
                     .emit();
-                    self.set_tainted_by_errors(reported);
                 }
 
                 ty::ExistentialTraitRef { def_id: trait_ref.def_id, args }
diff --git a/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs b/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
index f3ce3ab66553e..5b8b6e981250d 100644
--- a/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
+++ b/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
@@ -78,7 +78,7 @@ use rustc_middle::ty::trait_def::TraitSpecializationKind;
 use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt};
 use rustc_middle::ty::{GenericArg, GenericArgs, GenericArgsRef};
 use rustc_span::{ErrorGuaranteed, Span};
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
 use rustc_trait_selection::traits::{self, translate_args_with_cause, wf, ObligationCtxt};
 
diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs
index 2f6b0a582e58c..dd7fbba753bdd 100644
--- a/compiler/rustc_hir_analysis/src/lib.rs
+++ b/compiler/rustc_hir_analysis/src/lib.rs
@@ -92,7 +92,6 @@ mod errors;
 pub mod hir_wf_check;
 mod impl_wf_check;
 mod outlives;
-pub mod structured_errors;
 mod variance;
 
 use rustc_hir as hir;
diff --git a/compiler/rustc_hir_analysis/src/structured_errors.rs b/compiler/rustc_hir_analysis/src/structured_errors.rs
deleted file mode 100644
index 61a2400f9e434..0000000000000
--- a/compiler/rustc_hir_analysis/src/structured_errors.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-mod missing_cast_for_variadic_arg;
-mod wrong_number_of_generic_args;
-
-pub use self::{missing_cast_for_variadic_arg::*, wrong_number_of_generic_args::*};
-
-use rustc_errors::{Diag, ErrCode};
-use rustc_session::Session;
-
-pub trait StructuredDiag<'tcx> {
-    fn session(&self) -> &Session;
-
-    fn code(&self) -> ErrCode;
-
-    fn diagnostic(&self) -> Diag<'tcx> {
-        let err = self.diagnostic_common();
-
-        if self.session().teach(self.code()) {
-            self.diagnostic_extended(err)
-        } else {
-            self.diagnostic_regular(err)
-        }
-    }
-
-    fn diagnostic_common(&self) -> Diag<'tcx>;
-
-    fn diagnostic_regular(&self, err: Diag<'tcx>) -> Diag<'tcx> {
-        err
-    }
-
-    fn diagnostic_extended(&self, err: Diag<'tcx>) -> Diag<'tcx> {
-        err
-    }
-}
diff --git a/compiler/rustc_hir_analysis/src/structured_errors/missing_cast_for_variadic_arg.rs b/compiler/rustc_hir_analysis/src/structured_errors/missing_cast_for_variadic_arg.rs
deleted file mode 100644
index 0e78acbeae2d4..0000000000000
--- a/compiler/rustc_hir_analysis/src/structured_errors/missing_cast_for_variadic_arg.rs
+++ /dev/null
@@ -1,57 +0,0 @@
-use crate::{errors, structured_errors::StructuredDiag};
-use rustc_errors::{codes::*, Diag};
-use rustc_middle::ty::{Ty, TypeVisitableExt};
-use rustc_session::Session;
-use rustc_span::Span;
-
-pub struct MissingCastForVariadicArg<'tcx, 's> {
-    pub sess: &'tcx Session,
-    pub span: Span,
-    pub ty: Ty<'tcx>,
-    pub cast_ty: &'s str,
-}
-
-impl<'tcx> StructuredDiag<'tcx> for MissingCastForVariadicArg<'tcx, '_> {
-    fn session(&self) -> &Session {
-        self.sess
-    }
-
-    fn code(&self) -> ErrCode {
-        E0617
-    }
-
-    fn diagnostic_common(&self) -> Diag<'tcx> {
-        let (sugg_span, replace, help) =
-            if let Ok(snippet) = self.sess.source_map().span_to_snippet(self.span) {
-                (Some(self.span), format!("{} as {}", snippet, self.cast_ty), None)
-            } else {
-                (None, "".to_string(), Some(()))
-            };
-
-        let mut err = self.sess.dcx().create_err(errors::PassToVariadicFunction {
-            span: self.span,
-            ty: self.ty,
-            cast_ty: self.cast_ty,
-            help,
-            replace,
-            sugg_span,
-        });
-
-        if self.ty.references_error() {
-            err.downgrade_to_delayed_bug();
-        }
-
-        err
-    }
-
-    fn diagnostic_extended(&self, mut err: Diag<'tcx>) -> Diag<'tcx> {
-        err.note(format!(
-            "certain types, like `{}`, must be casted before passing them to a \
-                variadic function, because of arcane ABI rules dictated by the C \
-                standard",
-            self.ty
-        ));
-
-        err
-    }
-}
diff --git a/compiler/rustc_hir_typeck/messages.ftl b/compiler/rustc_hir_typeck/messages.ftl
index 3c5070bd00628..39d430cf73b76 100644
--- a/compiler/rustc_hir_typeck/messages.ftl
+++ b/compiler/rustc_hir_typeck/messages.ftl
@@ -38,6 +38,7 @@ hir_typeck_cast_thin_pointer_to_fat_pointer = cannot cast thin pointer `{$expr_t
 
         For more information about casts, take a look at The Book:
         https://doc.rust-lang.org/reference/expressions/operator-expr.html#type-cast-expressions",
+
 hir_typeck_cast_unknown_pointer = cannot cast {$to ->
     [true] to
     *[false] from
@@ -138,6 +139,16 @@ hir_typeck_option_result_asref = use `{$def_path}::as_ref` to convert `{$expecte
 hir_typeck_option_result_cloned = use `{$def_path}::cloned` to clone the value inside the `{$def_path}`
 hir_typeck_option_result_copied = use `{$def_path}::copied` to copy the value inside the `{$def_path}`
 
+hir_typeck_pass_to_variadic_function = can't pass `{$ty}` to variadic function
+    .suggestion = cast the value to `{$cast_ty}`
+    .help = cast the value to `{$cast_ty}`
+    .teach_help = certain types, like `{$ty}`, must be casted before passing them to a variadic function, because of arcane ABI rules dictated by the C standard
+
+hir_typeck_ptr_cast_add_auto_to_object = adding {$traits_len ->
+    [1] an auto trait {$traits}
+    *[other] auto traits {$traits}
+} to a trait object in a pointer cast may cause UB later on
+
 hir_typeck_remove_semi_for_coerce = you might have meant to return the `match` expression
 hir_typeck_remove_semi_for_coerce_expr = this could be implicitly returned but it is a statement, not a tail expression
 hir_typeck_remove_semi_for_coerce_ret = the `match` arms can conform to this return type
diff --git a/compiler/rustc_hir_typeck/src/callee.rs b/compiler/rustc_hir_typeck/src/callee.rs
index 3b199b7e3c26d..0d2a55a9507c2 100644
--- a/compiler/rustc_hir_typeck/src/callee.rs
+++ b/compiler/rustc_hir_typeck/src/callee.rs
@@ -24,8 +24,8 @@ use rustc_span::def_id::LocalDefId;
 use rustc_span::symbol::{sym, Ident};
 use rustc_span::Span;
 use rustc_target::spec::abi;
+use rustc_trait_selection::error_reporting::traits::DefIdOrName;
 use rustc_trait_selection::infer::InferCtxtExt as _;
-use rustc_trait_selection::traits::error_reporting::DefIdOrName;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt as _;
 
 use std::{iter, slice};
diff --git a/compiler/rustc_hir_typeck/src/cast.rs b/compiler/rustc_hir_typeck/src/cast.rs
index 53e44d6bcaee8..341d533492d19 100644
--- a/compiler/rustc_hir_typeck/src/cast.rs
+++ b/compiler/rustc_hir_typeck/src/cast.rs
@@ -32,9 +32,9 @@ use super::FnCtxt;
 
 use crate::errors;
 use crate::type_error_struct;
-use hir::ExprKind;
+use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{codes::*, Applicability, Diag, ErrorGuaranteed};
-use rustc_hir as hir;
+use rustc_hir::{self as hir, ExprKind};
 use rustc_macros::{TypeFoldable, TypeVisitable};
 use rustc_middle::bug;
 use rustc_middle::mir::Mutability;
@@ -44,7 +44,7 @@ use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::TyCtxt;
 use rustc_middle::ty::{self, Ty, TypeAndMut, TypeVisitableExt, VariantDef};
 use rustc_session::lint;
-use rustc_span::def_id::{DefId, LOCAL_CRATE};
+use rustc_span::def_id::LOCAL_CRATE;
 use rustc_span::symbol::sym;
 use rustc_span::Span;
 use rustc_span::DUMMY_SP;
@@ -73,7 +73,7 @@ enum PointerKind<'tcx> {
     /// No metadata attached, ie pointer to sized type or foreign type
     Thin,
     /// A trait object
-    VTable(Option<DefId>),
+    VTable(&'tcx ty::List<ty::Binder<'tcx, ty::ExistentialPredicate<'tcx>>>),
     /// Slice
     Length,
     /// The unsize info of this projection or opaque type
@@ -101,7 +101,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         Ok(match *t.kind() {
             ty::Slice(_) | ty::Str => Some(PointerKind::Length),
-            ty::Dynamic(tty, _, ty::Dyn) => Some(PointerKind::VTable(tty.principal_def_id())),
+            ty::Dynamic(tty, _, ty::Dyn) => Some(PointerKind::VTable(tty)),
             ty::Adt(def, args) if def.is_struct() => match def.non_enum_variant().tail_opt() {
                 None => Some(PointerKind::Thin),
                 Some(f) => {
@@ -755,7 +755,7 @@ impl<'a, 'tcx> CastCheck<'tcx> {
                 Err(CastError::IllegalCast)
             }
 
-            // ptr -> *
+            // ptr -> ptr
             (Ptr(m_e), Ptr(m_c)) => self.check_ptr_ptr_cast(fcx, m_e, m_c), // ptr-ptr-cast
 
             // ptr-addr-cast
@@ -799,40 +799,126 @@ impl<'a, 'tcx> CastCheck<'tcx> {
     fn check_ptr_ptr_cast(
         &self,
         fcx: &FnCtxt<'a, 'tcx>,
-        m_expr: ty::TypeAndMut<'tcx>,
-        m_cast: ty::TypeAndMut<'tcx>,
+        m_src: ty::TypeAndMut<'tcx>,
+        m_dst: ty::TypeAndMut<'tcx>,
     ) -> Result<CastKind, CastError> {
-        debug!("check_ptr_ptr_cast m_expr={:?} m_cast={:?}", m_expr, m_cast);
+        debug!("check_ptr_ptr_cast m_src={m_src:?} m_dst={m_dst:?}");
         // ptr-ptr cast. vtables must match.
 
-        let expr_kind = fcx.pointer_kind(m_expr.ty, self.span)?;
-        let cast_kind = fcx.pointer_kind(m_cast.ty, self.span)?;
+        let src_kind = fcx.tcx.erase_regions(fcx.pointer_kind(m_src.ty, self.span)?);
+        let dst_kind = fcx.tcx.erase_regions(fcx.pointer_kind(m_dst.ty, self.span)?);
 
-        let Some(cast_kind) = cast_kind else {
+        match (src_kind, dst_kind) {
             // We can't cast if target pointer kind is unknown
-            return Err(CastError::UnknownCastPtrKind);
-        };
+            (_, None) => Err(CastError::UnknownCastPtrKind),
+            // Cast to thin pointer is OK
+            (_, Some(PointerKind::Thin)) => Ok(CastKind::PtrPtrCast),
 
-        // Cast to thin pointer is OK
-        if cast_kind == PointerKind::Thin {
-            return Ok(CastKind::PtrPtrCast);
-        }
-
-        let Some(expr_kind) = expr_kind else {
             // We can't cast to fat pointer if source pointer kind is unknown
-            return Err(CastError::UnknownExprPtrKind);
-        };
+            (None, _) => Err(CastError::UnknownExprPtrKind),
+
+            // thin -> fat? report invalid cast (don't complain about vtable kinds)
+            (Some(PointerKind::Thin), _) => Err(CastError::SizedUnsizedCast),
+
+            // trait object -> trait object? need to do additional checks
+            (Some(PointerKind::VTable(src_tty)), Some(PointerKind::VTable(dst_tty))) => {
+                match (src_tty.principal(), dst_tty.principal()) {
+                    // A<dyn Src<...> + SrcAuto> -> B<dyn Dst<...> + DstAuto>. need to make sure
+                    // - `Src` and `Dst` traits are the same
+                    // - traits have the same generic arguments
+                    // - `SrcAuto` is a superset of `DstAuto`
+                    (Some(src_principal), Some(dst_principal)) => {
+                        let tcx = fcx.tcx;
+
+                        // Check that the traits are actually the same.
+                        // The `dyn Src = dyn Dst` check below would suffice,
+                        // but this may produce a better diagnostic.
+                        //
+                        // Note that trait upcasting goes through a different mechanism (`coerce_unsized`)
+                        // and is unaffected by this check.
+                        if src_principal.def_id() != dst_principal.def_id() {
+                            return Err(CastError::DifferingKinds);
+                        }
 
-        // thin -> fat? report invalid cast (don't complain about vtable kinds)
-        if expr_kind == PointerKind::Thin {
-            return Err(CastError::SizedUnsizedCast);
-        }
+                        // We need to reconstruct trait object types.
+                        // `m_src` and `m_dst` won't work for us here because they will potentially
+                        // contain wrappers, which we do not care about.
+                        //
+                        // e.g. we want to allow `dyn T -> (dyn T,)`, etc.
+                        //
+                        // We also need to skip auto traits to emit an FCW and not an error.
+                        let src_obj = tcx.mk_ty_from_kind(ty::Dynamic(
+                            tcx.mk_poly_existential_predicates(
+                                &src_tty.without_auto_traits().collect::<Vec<_>>(),
+                            ),
+                            tcx.lifetimes.re_erased,
+                            ty::Dyn,
+                        ));
+                        let dst_obj = tcx.mk_ty_from_kind(ty::Dynamic(
+                            tcx.mk_poly_existential_predicates(
+                                &dst_tty.without_auto_traits().collect::<Vec<_>>(),
+                            ),
+                            tcx.lifetimes.re_erased,
+                            ty::Dyn,
+                        ));
 
-        // vtable kinds must match
-        if fcx.tcx.erase_regions(cast_kind) == fcx.tcx.erase_regions(expr_kind) {
-            Ok(CastKind::PtrPtrCast)
-        } else {
-            Err(CastError::DifferingKinds)
+                        // `dyn Src = dyn Dst`, this checks for matching traits/generics
+                        fcx.demand_eqtype(self.span, src_obj, dst_obj);
+
+                        // Check that `SrcAuto` (+auto traits implied by `Src`) is a superset of `DstAuto`.
+                        // Emit an FCW otherwise.
+                        let src_auto: FxHashSet<_> = src_tty
+                            .auto_traits()
+                            .chain(
+                                tcx.supertrait_def_ids(src_principal.def_id())
+                                    .filter(|def_id| tcx.trait_is_auto(*def_id)),
+                            )
+                            .collect();
+
+                        let added = dst_tty
+                            .auto_traits()
+                            .filter(|trait_did| !src_auto.contains(trait_did))
+                            .collect::<Vec<_>>();
+
+                        if !added.is_empty() {
+                            tcx.emit_node_span_lint(
+                                lint::builtin::PTR_CAST_ADD_AUTO_TO_OBJECT,
+                                self.expr.hir_id,
+                                self.span,
+                                errors::PtrCastAddAutoToObject {
+                                    traits_len: added.len(),
+                                    traits: {
+                                        let mut traits: Vec<_> = added
+                                            .into_iter()
+                                            .map(|trait_did| tcx.def_path_str(trait_did))
+                                            .collect();
+
+                                        traits.sort();
+                                        traits.into()
+                                    },
+                                },
+                            )
+                        }
+
+                        Ok(CastKind::PtrPtrCast)
+                    }
+
+                    // dyn Auto -> dyn Auto'? ok.
+                    (None, None) => Ok(CastKind::PtrPtrCast),
+
+                    // dyn Trait -> dyn Auto? should be ok, but we used to not allow it.
+                    // FIXME: allow this
+                    (Some(_), None) => Err(CastError::DifferingKinds),
+
+                    // dyn Auto -> dyn Trait? not ok.
+                    (None, Some(_)) => Err(CastError::DifferingKinds),
+                }
+            }
+
+            // fat -> fat? metadata kinds must match
+            (Some(src_kind), Some(dst_kind)) if src_kind == dst_kind => Ok(CastKind::PtrPtrCast),
+
+            (_, _) => Err(CastError::DifferingKinds),
         }
     }
 
diff --git a/compiler/rustc_hir_typeck/src/closure.rs b/compiler/rustc_hir_typeck/src/closure.rs
index ac7ed3e26f976..08de871f6fa94 100644
--- a/compiler/rustc_hir_typeck/src/closure.rs
+++ b/compiler/rustc_hir_typeck/src/closure.rs
@@ -17,9 +17,9 @@ use rustc_middle::ty::{self, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor};
 use rustc_span::def_id::LocalDefId;
 use rustc_span::Span;
 use rustc_target::spec::abi::Abi;
+use rustc_trait_selection::error_reporting::traits::ArgKind;
+use rustc_trait_selection::error_reporting::traits::InferCtxtExt as _;
 use rustc_trait_selection::traits;
-use rustc_trait_selection::traits::error_reporting::ArgKind;
-use rustc_trait_selection::traits::error_reporting::InferCtxtExt as _;
 use rustc_type_ir::ClosureKind;
 use std::iter;
 use std::ops::ControlFlow;
@@ -424,9 +424,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             if let Some(trait_def_id) = trait_def_id {
                 let found_kind = match closure_kind {
                     hir::ClosureKind::Closure => self.tcx.fn_trait_kind_from_def_id(trait_def_id),
-                    hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async) => {
-                        self.tcx.async_fn_trait_kind_from_def_id(trait_def_id)
-                    }
+                    hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async) => self
+                        .tcx
+                        .async_fn_trait_kind_from_def_id(trait_def_id)
+                        .or_else(|| self.tcx.fn_trait_kind_from_def_id(trait_def_id)),
                     _ => None,
                 };
 
@@ -470,14 +471,37 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // for closures and async closures, respectively.
         match closure_kind {
             hir::ClosureKind::Closure
-                if self.tcx.fn_trait_kind_from_def_id(trait_def_id).is_some() => {}
+                if self.tcx.fn_trait_kind_from_def_id(trait_def_id).is_some() =>
+            {
+                self.extract_sig_from_projection(cause_span, projection)
+            }
+            hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async)
+                if self.tcx.async_fn_trait_kind_from_def_id(trait_def_id).is_some() =>
+            {
+                self.extract_sig_from_projection(cause_span, projection)
+            }
+            // It's possible we've passed the closure to a (somewhat out-of-fashion)
+            // `F: FnOnce() -> Fut, Fut: Future<Output = T>` style bound. Let's still
+            // guide inference here, since it's beneficial for the user.
             hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async)
-                if self.tcx.async_fn_trait_kind_from_def_id(trait_def_id).is_some() => {}
-            _ => return None,
+                if self.tcx.fn_trait_kind_from_def_id(trait_def_id).is_some() =>
+            {
+                self.extract_sig_from_projection_and_future_bound(cause_span, projection)
+            }
+            _ => None,
         }
+    }
+
+    /// Given an `FnOnce::Output` or `AsyncFn::Output` projection, extract the args
+    /// and return type to infer a [`ty::PolyFnSig`] for the closure.
+    fn extract_sig_from_projection(
+        &self,
+        cause_span: Option<Span>,
+        projection: ty::PolyProjectionPredicate<'tcx>,
+    ) -> Option<ExpectedSig<'tcx>> {
+        let projection = self.resolve_vars_if_possible(projection);
 
         let arg_param_ty = projection.skip_binder().projection_term.args.type_at(1);
-        let arg_param_ty = self.resolve_vars_if_possible(arg_param_ty);
         debug!(?arg_param_ty);
 
         let ty::Tuple(input_tys) = *arg_param_ty.kind() else {
@@ -486,7 +510,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Since this is a return parameter type it is safe to unwrap.
         let ret_param_ty = projection.skip_binder().term.expect_type();
-        let ret_param_ty = self.resolve_vars_if_possible(ret_param_ty);
         debug!(?ret_param_ty);
 
         let sig = projection.rebind(self.tcx.mk_fn_sig(
@@ -500,6 +523,69 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         Some(ExpectedSig { cause_span, sig })
     }
 
+    /// When an async closure is passed to a function that has a "two-part" `Fn`
+    /// and `Future` trait bound, like:
+    ///
+    /// ```rust
+    /// use std::future::Future;
+    ///
+    /// fn not_exactly_an_async_closure<F, Fut>(_f: F)
+    /// where
+    ///     F: FnOnce(String, u32) -> Fut,
+    ///     Fut: Future<Output = i32>,
+    /// {}
+    /// ```
+    ///
+    /// The we want to be able to extract the signature to guide inference in the async
+    /// closure. We will have two projection predicates registered in this case. First,
+    /// we identify the `FnOnce<Args, Output = ?Fut>` bound, and if the output type is
+    /// an inference variable `?Fut`, we check if that is bounded by a `Future<Output = Ty>`
+    /// projection.
+    fn extract_sig_from_projection_and_future_bound(
+        &self,
+        cause_span: Option<Span>,
+        projection: ty::PolyProjectionPredicate<'tcx>,
+    ) -> Option<ExpectedSig<'tcx>> {
+        let projection = self.resolve_vars_if_possible(projection);
+
+        let arg_param_ty = projection.skip_binder().projection_term.args.type_at(1);
+        debug!(?arg_param_ty);
+
+        let ty::Tuple(input_tys) = *arg_param_ty.kind() else {
+            return None;
+        };
+
+        // If the return type is a type variable, look for bounds on it.
+        // We could theoretically support other kinds of return types here,
+        // but none of them would be useful, since async closures return
+        // concrete anonymous future types, and their futures are not coerced
+        // into any other type within the body of the async closure.
+        let ty::Infer(ty::TyVar(return_vid)) = *projection.skip_binder().term.expect_type().kind()
+        else {
+            return None;
+        };
+
+        // FIXME: We may want to elaborate here, though I assume this will be exceedingly rare.
+        for bound in self.obligations_for_self_ty(return_vid) {
+            if let Some(ret_projection) = bound.predicate.as_projection_clause()
+                && let Some(ret_projection) = ret_projection.no_bound_vars()
+                && self.tcx.is_lang_item(ret_projection.def_id(), LangItem::FutureOutput)
+            {
+                let sig = projection.rebind(self.tcx.mk_fn_sig(
+                    input_tys,
+                    ret_projection.term.expect_type(),
+                    false,
+                    hir::Safety::Safe,
+                    Abi::Rust,
+                ));
+
+                return Some(ExpectedSig { cause_span, sig });
+            }
+        }
+
+        None
+    }
+
     fn sig_of_closure(
         &self,
         expr_def_id: LocalDefId,
diff --git a/compiler/rustc_hir_typeck/src/coercion.rs b/compiler/rustc_hir_typeck/src/coercion.rs
index 4f0a089ee956f..5e2a68e1f02db 100644
--- a/compiler/rustc_hir_typeck/src/coercion.rs
+++ b/compiler/rustc_hir_typeck/src/coercion.rs
@@ -58,9 +58,9 @@ use rustc_session::parse::feature_err;
 use rustc_span::symbol::sym;
 use rustc_span::{BytePos, DesugaringKind, Span, DUMMY_SP};
 use rustc_target::spec::abi::Abi;
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtSelectionErrExt as _;
 use rustc_trait_selection::infer::InferCtxtExt as _;
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
 use rustc_trait_selection::traits::{
     self, NormalizeExt, ObligationCause, ObligationCauseCode, ObligationCtxt,
diff --git a/compiler/rustc_hir_typeck/src/errors.rs b/compiler/rustc_hir_typeck/src/errors.rs
index f1ed2ade3d44e..9a38d6d4a7195 100644
--- a/compiler/rustc_hir_typeck/src/errors.rs
+++ b/compiler/rustc_hir_typeck/src/errors.rs
@@ -4,8 +4,8 @@ use std::borrow::Cow;
 
 use crate::fluent_generated as fluent;
 use rustc_errors::{
-    codes::*, Applicability, Diag, DiagArgValue, EmissionGuarantee, IntoDiagArg, MultiSpan,
-    SubdiagMessageOp, Subdiagnostic,
+    codes::*, Applicability, Diag, DiagArgValue, DiagSymbolList, EmissionGuarantee, IntoDiagArg,
+    MultiSpan, SubdiagMessageOp, Subdiagnostic,
 };
 use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
 use rustc_middle::ty::{self, Ty};
@@ -253,6 +253,13 @@ pub struct LossyProvenanceInt2Ptr<'tcx> {
     pub sugg: LossyProvenanceInt2PtrSuggestion,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(hir_typeck_ptr_cast_add_auto_to_object)]
+pub struct PtrCastAddAutoToObject {
+    pub traits_len: usize,
+    pub traits: DiagSymbolList<String>,
+}
+
 #[derive(Subdiagnostic)]
 #[multipart_suggestion(hir_typeck_suggestion, applicability = "has-placeholders")]
 pub struct LossyProvenanceInt2PtrSuggestion {
@@ -701,3 +708,19 @@ pub(crate) struct CastThinPointerToFatPointer<'tcx> {
     #[note(hir_typeck_teach_help)]
     pub(crate) teach: Option<()>,
 }
+
+#[derive(Diagnostic)]
+#[diag(hir_typeck_pass_to_variadic_function, code = E0617)]
+pub(crate) struct PassToVariadicFunction<'tcx, 'a> {
+    #[primary_span]
+    pub span: Span,
+    pub ty: Ty<'tcx>,
+    pub cast_ty: &'a str,
+    #[suggestion(code = "{replace}", applicability = "machine-applicable")]
+    pub sugg_span: Option<Span>,
+    pub replace: String,
+    #[help]
+    pub help: Option<()>,
+    #[note(hir_typeck_teach_help)]
+    pub(crate) teach: Option<()>,
+}
diff --git a/compiler/rustc_hir_typeck/src/expr.rs b/compiler/rustc_hir_typeck/src/expr.rs
index bd5e5294983d2..f057dbc013fc3 100644
--- a/compiler/rustc_hir_typeck/src/expr.rs
+++ b/compiler/rustc_hir_typeck/src/expr.rs
@@ -53,9 +53,9 @@ use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::Span;
 use rustc_target::abi::{FieldIdx, FIRST_VARIANT};
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::infer::InferCtxtExt;
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt as _;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 use rustc_trait_selection::traits::ObligationCtxt;
 use rustc_trait_selection::traits::{self, ObligationCauseCode};
 
@@ -2177,10 +2177,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         skip_fields: &[hir::ExprField<'_>],
         kind_name: &str,
     ) -> ErrorGuaranteed {
-        if variant.is_recovered() {
-            let guar =
-                self.dcx().span_delayed_bug(expr.span, "parser recovered but no error was emitted");
-            self.set_tainted_by_errors(guar);
+        // we don't care to report errors for a struct if the struct itself is tainted
+        if let Err(guar) = variant.has_errors() {
             return guar;
         }
         let mut err = self.err_ctxt().type_error_struct_with_diag(
@@ -2345,6 +2343,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     let mut last_ty = None;
                     let mut nested_fields = Vec::new();
                     let mut index = None;
+
+                    // we don't care to report errors for a struct if the struct itself is tainted
+                    if let Err(guar) = adt_def.non_enum_variant().has_errors() {
+                        return Ty::new_error(self.tcx(), guar);
+                    }
                     while let Some(idx) = self.tcx.find_field((adt_def.did(), ident)) {
                         let &mut first_idx = index.get_or_insert(idx);
                         let field = &adt_def.non_enum_variant().fields[idx];
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
index 5450243417f7f..ea9567f4e3dcb 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
@@ -37,7 +37,7 @@ use rustc_span::hygiene::DesugaringKind;
 use rustc_span::symbol::{kw, sym};
 use rustc_span::Span;
 use rustc_target::abi::FieldIdx;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::{
     self, NormalizeExt, ObligationCauseCode, ObligationCtxt, StructurallyNormalizeExt,
 };
@@ -1139,7 +1139,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             // parameter's value explicitly, so we have to do some error-
             // checking here.
             let arg_count =
-                check_generic_arg_count_for_call(tcx, def_id, generics, seg, IsMethodCall::No);
+                check_generic_arg_count_for_call(self, def_id, generics, seg, IsMethodCall::No);
 
             if let ExplicitLateBound::Yes = arg_count.explicit_late_bound {
                 explicit_late_bound = ExplicitLateBound::Yes;
@@ -1375,7 +1375,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         let args_raw = self_ctor_args.unwrap_or_else(|| {
             lower_generic_args(
-                tcx,
+                self,
                 def_id,
                 &[],
                 has_self,
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
index 10092dce58766..ab0f356ce91f1 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
@@ -28,7 +28,6 @@ use rustc_hir::{ExprKind, HirId, Node, QPath};
 use rustc_hir_analysis::check::intrinsicck::InlineAsmCtxt;
 use rustc_hir_analysis::check::potentially_plural_count;
 use rustc_hir_analysis::hir_ty_lowering::HirTyLowerer;
-use rustc_hir_analysis::structured_errors::StructuredDiag;
 use rustc_index::IndexVec;
 use rustc_infer::infer::error_reporting::{FailureCode, ObligationCauseExt};
 use rustc_infer::infer::TypeTrace;
@@ -406,9 +405,22 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     ty: Ty<'tcx>,
                     cast_ty: &str,
                 ) {
-                    use rustc_hir_analysis::structured_errors::MissingCastForVariadicArg;
+                    let (sugg_span, replace, help) =
+                        if let Ok(snippet) = sess.source_map().span_to_snippet(span) {
+                            (Some(span), format!("{snippet} as {cast_ty}"), None)
+                        } else {
+                            (None, "".to_string(), Some(()))
+                        };
 
-                    MissingCastForVariadicArg { sess, span, ty, cast_ty }.diagnostic().emit();
+                    sess.dcx().emit_err(errors::PassToVariadicFunction {
+                        span,
+                        ty,
+                        cast_ty,
+                        help,
+                        replace,
+                        sugg_span,
+                        teach: sess.teach(E0617).then_some(()),
+                    });
                 }
 
                 // There are a few types which get autopromoted when passed via varargs
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
index da68da029b417..b5796fbd48a88 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
@@ -5,7 +5,7 @@ mod checks;
 mod inspect_obligations;
 mod suggestions;
 
-use rustc_errors::{DiagCtxtHandle, ErrorGuaranteed};
+use rustc_errors::DiagCtxtHandle;
 
 use crate::coercion::DynamicCoerceMany;
 use crate::fallback::DivergingFallbackBehavior;
@@ -217,6 +217,10 @@ impl<'tcx> HirTyLowerer<'tcx> for FnCtxt<'_, 'tcx> {
         self.tcx
     }
 
+    fn dcx(&self) -> DiagCtxtHandle<'_> {
+        self.root_ctxt.dcx()
+    }
+
     fn item_def_id(&self) -> LocalDefId {
         self.body_id
     }
@@ -338,10 +342,6 @@ impl<'tcx> HirTyLowerer<'tcx> for FnCtxt<'_, 'tcx> {
         Some(&self.infcx)
     }
 
-    fn set_tainted_by_errors(&self, e: ErrorGuaranteed) {
-        self.infcx.set_tainted_by_errors(e)
-    }
-
     fn lower_fn_sig(
         &self,
         decl: &rustc_hir::FnDecl<'tcx>,
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
index fca0a3e195d77..5975c52ca46e8 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
@@ -32,10 +32,10 @@ use rustc_session::errors::ExprParenthesesNeeded;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{sym, Ident};
 use rustc_span::{Span, Symbol};
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::DefIdOrName;
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits;
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt;
-use rustc_trait_selection::traits::error_reporting::DefIdOrName;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt as _;
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
@@ -466,21 +466,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     borrow_removal_span,
                 });
                 return true;
-            } else if let Some((deref_ty, _)) =
-                self.autoderef(expr.span, found_ty_inner).silence_errors().nth(1)
-                && self.can_eq(self.param_env, deref_ty, peeled)
-                && error_tys_equate_as_ref
-            {
-                let sugg = prefix_wrap(".as_deref()");
-                err.subdiagnostic(errors::SuggestConvertViaMethod {
-                    span: expr.span.shrink_to_hi(),
-                    sugg,
-                    expected,
-                    found,
-                    borrow_removal_span,
-                });
-                return true;
-            } else if let ty::Adt(adt, _) = found_ty_inner.peel_refs().kind()
+            } else if let ty::Ref(_, peeled_found_ty, _) = found_ty_inner.kind()
+                && let ty::Adt(adt, _) = peeled_found_ty.peel_refs().kind()
                 && self.tcx.is_lang_item(adt.did(), LangItem::String)
                 && peeled.is_str()
                 // `Result::map`, conversely, does not take ref of the error type.
@@ -496,12 +483,47 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     Applicability::MachineApplicable,
                 );
                 return true;
+            } else {
+                if !error_tys_equate_as_ref {
+                    return false;
+                }
+                let mut steps = self.autoderef(expr.span, found_ty_inner).silence_errors();
+                if let Some((deref_ty, _)) = steps.nth(1)
+                    && self.can_eq(self.param_env, deref_ty, peeled)
+                {
+                    let sugg = prefix_wrap(".as_deref()");
+                    err.subdiagnostic(errors::SuggestConvertViaMethod {
+                        span: expr.span.shrink_to_hi(),
+                        sugg,
+                        expected,
+                        found,
+                        borrow_removal_span,
+                    });
+                    return true;
+                }
+                for (deref_ty, n_step) in steps {
+                    if self.can_eq(self.param_env, deref_ty, peeled) {
+                        let explicit_deref = "*".repeat(n_step);
+                        let sugg = prefix_wrap(&format!(".map(|v| &{explicit_deref}v)"));
+                        err.subdiagnostic(errors::SuggestConvertViaMethod {
+                            span: expr.span.shrink_to_hi(),
+                            sugg,
+                            expected,
+                            found,
+                            borrow_removal_span,
+                        });
+                        return true;
+                    }
+                }
             }
         }
 
         false
     }
 
+    /// If `ty` is `Option<T>`, returns `T, T, None`.
+    /// If `ty` is `Result<T, E>`, returns `T, T, Some(E, E)`.
+    /// Otherwise, returns `None`.
     fn deconstruct_option_or_result(
         &self,
         found_ty: Ty<'tcx>,
diff --git a/compiler/rustc_hir_typeck/src/method/confirm.rs b/compiler/rustc_hir_typeck/src/method/confirm.rs
index 02844bcadac6e..e574fde14fb0a 100644
--- a/compiler/rustc_hir_typeck/src/method/confirm.rs
+++ b/compiler/rustc_hir_typeck/src/method/confirm.rs
@@ -354,7 +354,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         let generics = self.tcx.generics_of(pick.item.def_id);
 
         let arg_count_correct = check_generic_arg_count_for_call(
-            self.tcx,
+            self.fcx,
             pick.item.def_id,
             generics,
             seg,
@@ -425,7 +425,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         }
 
         let args = lower_generic_args(
-            self.tcx,
+            self.fcx,
             pick.item.def_id,
             parent_args,
             false,
diff --git a/compiler/rustc_hir_typeck/src/method/mod.rs b/compiler/rustc_hir_typeck/src/method/mod.rs
index ff8899ae0368d..dc1b888374cf2 100644
--- a/compiler/rustc_hir_typeck/src/method/mod.rs
+++ b/compiler/rustc_hir_typeck/src/method/mod.rs
@@ -21,7 +21,7 @@ use rustc_middle::ty::{self, GenericParamDefKind, Ty, TypeVisitableExt};
 use rustc_middle::ty::{GenericArgs, GenericArgsRef};
 use rustc_middle::{bug, span_bug};
 use rustc_span::symbol::Ident;
-use rustc_span::{sym, Span};
+use rustc_span::Span;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
 use rustc_trait_selection::traits::{self, NormalizeExt};
 
@@ -359,7 +359,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // FIXME(effects) find a better way to do this
         // Operators don't have generic methods, but making them `#[const_trait]` gives them
         // `const host: bool`.
-        let args = if self.tcx.has_attr(trait_def_id, sym::const_trait) {
+        let args = if self.tcx.is_const_trait(trait_def_id) {
             self.tcx.mk_args_from_iter(
                 args.iter()
                     .chain([self.tcx.expected_host_effect_param_for_body(self.body_id).into()]),
diff --git a/compiler/rustc_hir_typeck/src/method/suggest.rs b/compiler/rustc_hir_typeck/src/method/suggest.rs
index dba3edbc1d722..425289ce3c526 100644
--- a/compiler/rustc_hir_typeck/src/method/suggest.rs
+++ b/compiler/rustc_hir_typeck/src/method/suggest.rs
@@ -35,9 +35,9 @@ use rustc_span::def_id::DefIdSet;
 use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::{edit_distance, ErrorGuaranteed, ExpnKind, FileName, MacroKind, Span};
 use rustc_span::{Symbol, DUMMY_SP};
+use rustc_trait_selection::error_reporting::traits::on_unimplemented::OnUnimplementedNote;
+use rustc_trait_selection::error_reporting::traits::on_unimplemented::TypeErrCtxtExt as _;
 use rustc_trait_selection::infer::InferCtxtExt;
-use rustc_trait_selection::traits::error_reporting::on_unimplemented::OnUnimplementedNote;
-use rustc_trait_selection::traits::error_reporting::on_unimplemented::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt as _;
 use rustc_trait_selection::traits::{
     supertraits, FulfillmentError, Obligation, ObligationCause, ObligationCauseCode,
diff --git a/compiler/rustc_hir_typeck/src/op.rs b/compiler/rustc_hir_typeck/src/op.rs
index 7264bc5a78d82..d59b8276d3ad4 100644
--- a/compiler/rustc_hir_typeck/src/op.rs
+++ b/compiler/rustc_hir_typeck/src/op.rs
@@ -18,8 +18,8 @@ use rustc_session::errors::ExprParenthesesNeeded;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{sym, Ident};
 use rustc_span::Span;
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt as _;
 use rustc_trait_selection::infer::InferCtxtExt;
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::{FulfillmentError, ObligationCtxt};
 use rustc_type_ir::TyKind::*;
 
diff --git a/compiler/rustc_hir_typeck/src/pat.rs b/compiler/rustc_hir_typeck/src/pat.rs
index be526e1c26c4c..6d1e9ff1f9527 100644
--- a/compiler/rustc_hir_typeck/src/pat.rs
+++ b/compiler/rustc_hir_typeck/src/pat.rs
@@ -1531,9 +1531,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             .filter(|(_, ident)| !used_fields.contains_key(ident))
             .collect::<Vec<_>>();
 
-        let inexistent_fields_err = if !(inexistent_fields.is_empty() || variant.is_recovered())
+        let inexistent_fields_err = if !inexistent_fields.is_empty()
             && !inexistent_fields.iter().any(|field| field.ident.name == kw::Underscore)
         {
+            // we don't care to report errors for a struct if the struct itself is tainted
+            variant.has_errors()?;
             Some(self.error_inexistent_fields(
                 adt.variant_descr(),
                 &inexistent_fields,
@@ -1812,6 +1814,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 return Ok(());
             }
 
+            // we don't care to report errors for a struct if the struct itself is tainted
+            variant.has_errors()?;
+
             let path = rustc_hir_pretty::qpath_to_string(&self.tcx, qpath);
             let mut err = struct_span_code_err!(
                 self.dcx(),
diff --git a/compiler/rustc_hir_typeck/src/writeback.rs b/compiler/rustc_hir_typeck/src/writeback.rs
index ceb7480686d90..e800c1a97d9eb 100644
--- a/compiler/rustc_hir_typeck/src/writeback.rs
+++ b/compiler/rustc_hir_typeck/src/writeback.rs
@@ -18,8 +18,8 @@ use rustc_middle::ty::TypeSuperFoldable;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::symbol::sym;
 use rustc_span::Span;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::solve;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 
 use std::mem;
 
diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index cebb9d09a4798..bb1285ee8135d 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -45,13 +45,10 @@
 //! ported to this system, and which relies on string concatenation at the
 //! time of error detection.
 
-use super::lexical_region_resolve::RegionResolutionError;
-use super::region_constraints::GenericKind;
-use super::{InferCtxt, RegionVariableOrigin, SubregionOrigin, TypeTrace, ValuePairs};
+use super::{InferCtxt, TypeTrace, ValuePairs};
 
-use crate::errors::{self, ObligationCauseFailureCode, TypeErrorAdditionalDiags};
+use crate::errors::{ObligationCauseFailureCode, TypeErrorAdditionalDiags};
 use crate::infer;
-use crate::infer::error_reporting::nice_region_error::find_anon_type::find_anon_type;
 use crate::infer::ExpectedFound;
 use crate::traits::{
     IfExpressionCause, MatchExpressionArmCause, ObligationCause, ObligationCauseCode,
@@ -61,38 +58,36 @@ use crate::traits::{
 use crate::infer::relate::{self, RelateResult, TypeRelation};
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
 use rustc_errors::{
-    codes::*, pluralize, struct_span_code_err, Applicability, Diag, DiagCtxtHandle,
-    DiagStyledString, ErrorGuaranteed, IntoDiagArg, StringPart,
+    pluralize, Applicability, Diag, DiagCtxtHandle, DiagStyledString, IntoDiagArg, StringPart,
 };
 use rustc_hir::def::DefKind;
-use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::Visitor;
 use rustc_hir::lang_items::LangItem;
-use rustc_hir::{self as hir, ParamName};
+use rustc_hir::{self as hir};
 use rustc_macros::extension;
 use rustc_middle::bug;
 use rustc_middle::dep_graph::DepContext;
 use rustc_middle::ty::error::TypeErrorToStringExt;
 use rustc_middle::ty::print::{with_forced_trimmed_paths, PrintError, PrintTraitRefExt as _};
-use rustc_middle::ty::Upcast;
 use rustc_middle::ty::{
-    self, error::TypeError, IsSuggestable, List, Region, Ty, TyCtxt, TypeFoldable,
-    TypeSuperVisitable, TypeVisitable, TypeVisitableExt,
+    self, error::TypeError, List, Region, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
+    TypeVisitable, TypeVisitableExt,
 };
-use rustc_span::{sym, symbol::kw, BytePos, DesugaringKind, Pos, Span};
+use rustc_span::{sym, BytePos, DesugaringKind, Pos, Span};
 use rustc_target::spec::abi;
 use std::borrow::Cow;
 use std::ops::{ControlFlow, Deref};
 use std::path::PathBuf;
 use std::{cmp, fmt, iter};
 
-mod note;
 mod note_and_explain;
 mod suggest;
 
 pub(crate) mod need_type_info;
 pub mod sub_relations;
 pub use need_type_info::TypeAnnotationNeeded;
+pub mod region;
 
 pub mod nice_region_error;
 
@@ -159,245 +154,6 @@ impl<'tcx> Deref for TypeErrCtxt<'_, 'tcx> {
     }
 }
 
-pub(super) fn note_and_explain_region<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    err: &mut Diag<'_>,
-    generic_param_scope: LocalDefId,
-    prefix: &str,
-    region: ty::Region<'tcx>,
-    suffix: &str,
-    alt_span: Option<Span>,
-) {
-    let (description, span) = match *region {
-        ty::ReEarlyParam(_) | ty::ReLateParam(_) | ty::RePlaceholder(_) | ty::ReStatic => {
-            msg_span_from_named_region(tcx, generic_param_scope, region, alt_span)
-        }
-
-        ty::ReError(_) => return,
-
-        // FIXME(#125431): `ReVar` shouldn't reach here.
-        ty::ReVar(_) => (format!("lifetime `{region}`"), alt_span),
-
-        ty::ReBound(..) | ty::ReErased => {
-            bug!("unexpected region for note_and_explain_region: {:?}", region);
-        }
-    };
-
-    emit_msg_span(err, prefix, description, span, suffix);
-}
-
-fn explain_free_region<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    err: &mut Diag<'_>,
-    generic_param_scope: LocalDefId,
-    prefix: &str,
-    region: ty::Region<'tcx>,
-    suffix: &str,
-) {
-    let (description, span) = msg_span_from_named_region(tcx, generic_param_scope, region, None);
-
-    label_msg_span(err, prefix, description, span, suffix);
-}
-
-fn msg_span_from_named_region<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    generic_param_scope: LocalDefId,
-    region: ty::Region<'tcx>,
-    alt_span: Option<Span>,
-) -> (String, Option<Span>) {
-    match *region {
-        ty::ReEarlyParam(br) => {
-            let scope = tcx
-                .parent(tcx.generics_of(generic_param_scope).region_param(br, tcx).def_id)
-                .expect_local();
-            let span = if let Some(param) =
-                tcx.hir().get_generics(scope).and_then(|generics| generics.get_named(br.name))
-            {
-                param.span
-            } else {
-                tcx.def_span(scope)
-            };
-            let text = if br.has_name() {
-                format!("the lifetime `{}` as defined here", br.name)
-            } else {
-                "the anonymous lifetime as defined here".to_string()
-            };
-            (text, Some(span))
-        }
-        ty::ReLateParam(ref fr) => {
-            if !fr.bound_region.is_named()
-                && let Some((ty, _)) =
-                    find_anon_type(tcx, generic_param_scope, region, &fr.bound_region)
-            {
-                ("the anonymous lifetime defined here".to_string(), Some(ty.span))
-            } else {
-                match fr.bound_region {
-                    ty::BoundRegionKind::BrNamed(_, name) => {
-                        let span = if let Some(param) = tcx
-                            .hir()
-                            .get_generics(generic_param_scope)
-                            .and_then(|generics| generics.get_named(name))
-                        {
-                            param.span
-                        } else {
-                            tcx.def_span(generic_param_scope)
-                        };
-                        let text = if name == kw::UnderscoreLifetime {
-                            "the anonymous lifetime as defined here".to_string()
-                        } else {
-                            format!("the lifetime `{name}` as defined here")
-                        };
-                        (text, Some(span))
-                    }
-                    ty::BrAnon => (
-                        "the anonymous lifetime as defined here".to_string(),
-                        Some(tcx.def_span(generic_param_scope)),
-                    ),
-                    _ => (
-                        format!("the lifetime `{region}` as defined here"),
-                        Some(tcx.def_span(generic_param_scope)),
-                    ),
-                }
-            }
-        }
-        ty::ReStatic => ("the static lifetime".to_owned(), alt_span),
-        ty::RePlaceholder(ty::PlaceholderRegion {
-            bound: ty::BoundRegion { kind: ty::BoundRegionKind::BrNamed(def_id, name), .. },
-            ..
-        }) => (format!("the lifetime `{name}` as defined here"), Some(tcx.def_span(def_id))),
-        ty::RePlaceholder(ty::PlaceholderRegion {
-            bound: ty::BoundRegion { kind: ty::BoundRegionKind::BrAnon, .. },
-            ..
-        }) => ("an anonymous lifetime".to_owned(), None),
-        _ => bug!("{:?}", region),
-    }
-}
-
-fn emit_msg_span(
-    err: &mut Diag<'_>,
-    prefix: &str,
-    description: String,
-    span: Option<Span>,
-    suffix: &str,
-) {
-    let message = format!("{prefix}{description}{suffix}");
-
-    if let Some(span) = span {
-        err.span_note(span, message);
-    } else {
-        err.note(message);
-    }
-}
-
-fn label_msg_span(
-    err: &mut Diag<'_>,
-    prefix: &str,
-    description: String,
-    span: Option<Span>,
-    suffix: &str,
-) {
-    let message = format!("{prefix}{description}{suffix}");
-
-    if let Some(span) = span {
-        err.span_label(span, message);
-    } else {
-        err.note(message);
-    }
-}
-
-#[instrument(level = "trace", skip(infcx))]
-pub fn unexpected_hidden_region_diagnostic<'a, 'tcx>(
-    infcx: &'a InferCtxt<'tcx>,
-    generic_param_scope: LocalDefId,
-    span: Span,
-    hidden_ty: Ty<'tcx>,
-    hidden_region: ty::Region<'tcx>,
-    opaque_ty_key: ty::OpaqueTypeKey<'tcx>,
-) -> Diag<'a> {
-    let tcx = infcx.tcx;
-    let mut err = infcx.dcx().create_err(errors::OpaqueCapturesLifetime {
-        span,
-        opaque_ty: Ty::new_opaque(tcx, opaque_ty_key.def_id.to_def_id(), opaque_ty_key.args),
-        opaque_ty_span: tcx.def_span(opaque_ty_key.def_id),
-    });
-
-    // Explain the region we are capturing.
-    match *hidden_region {
-        ty::ReEarlyParam(_) | ty::ReLateParam(_) | ty::ReStatic => {
-            // Assuming regionck succeeded (*), we ought to always be
-            // capturing *some* region from the fn header, and hence it
-            // ought to be free. So under normal circumstances, we will go
-            // down this path which gives a decent human readable
-            // explanation.
-            //
-            // (*) if not, the `tainted_by_errors` field would be set to
-            // `Some(ErrorGuaranteed)` in any case, so we wouldn't be here at all.
-            explain_free_region(
-                tcx,
-                &mut err,
-                generic_param_scope,
-                &format!("hidden type `{hidden_ty}` captures "),
-                hidden_region,
-                "",
-            );
-            if let Some(reg_info) = tcx.is_suitable_region(generic_param_scope, hidden_region) {
-                let fn_returns = tcx.return_type_impl_or_dyn_traits(reg_info.def_id);
-                nice_region_error::suggest_new_region_bound(
-                    tcx,
-                    &mut err,
-                    fn_returns,
-                    hidden_region.to_string(),
-                    None,
-                    format!("captures `{hidden_region}`"),
-                    None,
-                    Some(reg_info.def_id),
-                )
-            }
-        }
-        ty::RePlaceholder(_) => {
-            explain_free_region(
-                tcx,
-                &mut err,
-                generic_param_scope,
-                &format!("hidden type `{}` captures ", hidden_ty),
-                hidden_region,
-                "",
-            );
-        }
-        ty::ReError(_) => {
-            err.downgrade_to_delayed_bug();
-        }
-        _ => {
-            // Ugh. This is a painful case: the hidden region is not one
-            // that we can easily summarize or explain. This can happen
-            // in a case like
-            // `tests/ui/multiple-lifetimes/ordinary-bounds-unsuited.rs`:
-            //
-            // ```
-            // fn upper_bounds<'a, 'b>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'a, 'b> {
-            //   if condition() { a } else { b }
-            // }
-            // ```
-            //
-            // Here the captured lifetime is the intersection of `'a` and
-            // `'b`, which we can't quite express.
-
-            // We can at least report a really cryptic error for now.
-            note_and_explain_region(
-                tcx,
-                &mut err,
-                generic_param_scope,
-                &format!("hidden type `{hidden_ty}` captures "),
-                hidden_region,
-                "",
-                None,
-            );
-        }
-    }
-
-    err
-}
-
 impl<'tcx> InferCtxt<'tcx> {
     pub fn get_impl_future_output_ty(&self, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
         let (def_id, args) = match *ty.kind() {
@@ -438,193 +194,6 @@ impl<'tcx> InferCtxt<'tcx> {
 }
 
 impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
-    pub fn report_region_errors(
-        &self,
-        generic_param_scope: LocalDefId,
-        errors: &[RegionResolutionError<'tcx>],
-    ) -> ErrorGuaranteed {
-        assert!(!errors.is_empty());
-
-        if let Some(guaranteed) = self.infcx.tainted_by_errors() {
-            return guaranteed;
-        }
-
-        debug!("report_region_errors(): {} errors to start", errors.len());
-
-        // try to pre-process the errors, which will group some of them
-        // together into a `ProcessedErrors` group:
-        let errors = self.process_errors(errors);
-
-        debug!("report_region_errors: {} errors after preprocessing", errors.len());
-
-        let mut guar = None;
-        for error in errors {
-            debug!("report_region_errors: error = {:?}", error);
-
-            let e = if let Some(guar) =
-                self.try_report_nice_region_error(generic_param_scope, &error)
-            {
-                guar
-            } else {
-                match error.clone() {
-                    // These errors could indicate all manner of different
-                    // problems with many different solutions. Rather
-                    // than generate a "one size fits all" error, what we
-                    // attempt to do is go through a number of specific
-                    // scenarios and try to find the best way to present
-                    // the error. If all of these fails, we fall back to a rather
-                    // general bit of code that displays the error information
-                    RegionResolutionError::ConcreteFailure(origin, sub, sup) => {
-                        if sub.is_placeholder() || sup.is_placeholder() {
-                            self.report_placeholder_failure(generic_param_scope, origin, sub, sup)
-                                .emit()
-                        } else {
-                            self.report_concrete_failure(generic_param_scope, origin, sub, sup)
-                                .emit()
-                        }
-                    }
-
-                    RegionResolutionError::GenericBoundFailure(origin, param_ty, sub) => self
-                        .report_generic_bound_failure(
-                            generic_param_scope,
-                            origin.span(),
-                            Some(origin),
-                            param_ty,
-                            sub,
-                        ),
-
-                    RegionResolutionError::SubSupConflict(
-                        _,
-                        var_origin,
-                        sub_origin,
-                        sub_r,
-                        sup_origin,
-                        sup_r,
-                        _,
-                    ) => {
-                        if sub_r.is_placeholder() {
-                            self.report_placeholder_failure(
-                                generic_param_scope,
-                                sub_origin,
-                                sub_r,
-                                sup_r,
-                            )
-                            .emit()
-                        } else if sup_r.is_placeholder() {
-                            self.report_placeholder_failure(
-                                generic_param_scope,
-                                sup_origin,
-                                sub_r,
-                                sup_r,
-                            )
-                            .emit()
-                        } else {
-                            self.report_sub_sup_conflict(
-                                generic_param_scope,
-                                var_origin,
-                                sub_origin,
-                                sub_r,
-                                sup_origin,
-                                sup_r,
-                            )
-                        }
-                    }
-
-                    RegionResolutionError::UpperBoundUniverseConflict(
-                        _,
-                        _,
-                        _,
-                        sup_origin,
-                        sup_r,
-                    ) => {
-                        assert!(sup_r.is_placeholder());
-
-                        // Make a dummy value for the "sub region" --
-                        // this is the initial value of the
-                        // placeholder. In practice, we expect more
-                        // tailored errors that don't really use this
-                        // value.
-                        let sub_r = self.tcx.lifetimes.re_erased;
-
-                        self.report_placeholder_failure(
-                            generic_param_scope,
-                            sup_origin,
-                            sub_r,
-                            sup_r,
-                        )
-                        .emit()
-                    }
-
-                    RegionResolutionError::CannotNormalize(clause, origin) => {
-                        let clause: ty::Clause<'tcx> =
-                            clause.map_bound(ty::ClauseKind::TypeOutlives).upcast(self.tcx);
-                        self.tcx
-                            .dcx()
-                            .struct_span_err(origin.span(), format!("cannot normalize `{clause}`"))
-                            .emit()
-                    }
-                }
-            };
-
-            guar = Some(e)
-        }
-
-        guar.unwrap()
-    }
-
-    // This method goes through all the errors and try to group certain types
-    // of error together, for the purpose of suggesting explicit lifetime
-    // parameters to the user. This is done so that we can have a more
-    // complete view of what lifetimes should be the same.
-    // If the return value is an empty vector, it means that processing
-    // failed (so the return value of this method should not be used).
-    //
-    // The method also attempts to weed out messages that seem like
-    // duplicates that will be unhelpful to the end-user. But
-    // obviously it never weeds out ALL errors.
-    fn process_errors(
-        &self,
-        errors: &[RegionResolutionError<'tcx>],
-    ) -> Vec<RegionResolutionError<'tcx>> {
-        debug!("process_errors()");
-
-        // We want to avoid reporting generic-bound failures if we can
-        // avoid it: these have a very high rate of being unhelpful in
-        // practice. This is because they are basically secondary
-        // checks that test the state of the region graph after the
-        // rest of inference is done, and the other kinds of errors
-        // indicate that the region constraint graph is internally
-        // inconsistent, so these test results are likely to be
-        // meaningless.
-        //
-        // Therefore, we filter them out of the list unless they are
-        // the only thing in the list.
-
-        let is_bound_failure = |e: &RegionResolutionError<'tcx>| match *e {
-            RegionResolutionError::GenericBoundFailure(..) => true,
-            RegionResolutionError::ConcreteFailure(..)
-            | RegionResolutionError::SubSupConflict(..)
-            | RegionResolutionError::UpperBoundUniverseConflict(..)
-            | RegionResolutionError::CannotNormalize(..) => false,
-        };
-
-        let mut errors = if errors.iter().all(|e| is_bound_failure(e)) {
-            errors.to_owned()
-        } else {
-            errors.iter().filter(|&e| !is_bound_failure(e)).cloned().collect()
-        };
-
-        // sort the errors by span, for better error message stability.
-        errors.sort_by_key(|u| match *u {
-            RegionResolutionError::ConcreteFailure(ref sro, _, _) => sro.span(),
-            RegionResolutionError::GenericBoundFailure(ref sro, _, _) => sro.span(),
-            RegionResolutionError::SubSupConflict(_, ref rvo, _, _, _, _, _) => rvo.span(),
-            RegionResolutionError::UpperBoundUniverseConflict(_, ref rvo, _, _, _) => rvo.span(),
-            RegionResolutionError::CannotNormalize(_, ref sro) => sro.span(),
-        });
-        errors
-    }
-
     /// Adds a note if the types come from similarly named crates
     fn check_and_note_conflicting_crates(&self, err: &mut Diag<'_>, terr: TypeError<'tcx>) {
         use hir::def_id::CrateNum;
@@ -2341,359 +1910,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         ))
     }
 
-    pub fn report_generic_bound_failure(
-        &self,
-        generic_param_scope: LocalDefId,
-        span: Span,
-        origin: Option<SubregionOrigin<'tcx>>,
-        bound_kind: GenericKind<'tcx>,
-        sub: Region<'tcx>,
-    ) -> ErrorGuaranteed {
-        self.construct_generic_bound_failure(generic_param_scope, span, origin, bound_kind, sub)
-            .emit()
-    }
-
-    pub fn construct_generic_bound_failure(
-        &self,
-        generic_param_scope: LocalDefId,
-        span: Span,
-        origin: Option<SubregionOrigin<'tcx>>,
-        bound_kind: GenericKind<'tcx>,
-        sub: Region<'tcx>,
-    ) -> Diag<'a> {
-        if let Some(SubregionOrigin::CompareImplItemObligation {
-            span,
-            impl_item_def_id,
-            trait_item_def_id,
-        }) = origin
-        {
-            return self.infcx.report_extra_impl_obligation(
-                span,
-                impl_item_def_id,
-                trait_item_def_id,
-                &format!("`{bound_kind}: {sub}`"),
-            );
-        }
-
-        let labeled_user_string = match bound_kind {
-            GenericKind::Param(ref p) => format!("the parameter type `{p}`"),
-            GenericKind::Placeholder(ref p) => format!("the placeholder type `{p:?}`"),
-            GenericKind::Alias(ref p) => match p.kind(self.tcx) {
-                ty::Projection | ty::Inherent => {
-                    format!("the associated type `{p}`")
-                }
-                ty::Weak => format!("the type alias `{p}`"),
-                ty::Opaque => format!("the opaque type `{p}`"),
-            },
-        };
-
-        let mut err = self
-            .tcx
-            .dcx()
-            .struct_span_err(span, format!("{labeled_user_string} may not live long enough"));
-        err.code(match sub.kind() {
-            ty::ReEarlyParam(_) | ty::ReLateParam(_) if sub.has_name() => E0309,
-            ty::ReStatic => E0310,
-            _ => E0311,
-        });
-
-        '_explain: {
-            let (description, span) = match sub.kind() {
-                ty::ReEarlyParam(_) | ty::ReLateParam(_) | ty::ReStatic => {
-                    msg_span_from_named_region(self.tcx, generic_param_scope, sub, Some(span))
-                }
-                _ => (format!("lifetime `{sub}`"), Some(span)),
-            };
-            let prefix = format!("{labeled_user_string} must be valid for ");
-            label_msg_span(&mut err, &prefix, description, span, "...");
-            if let Some(origin) = origin {
-                self.note_region_origin(&mut err, &origin);
-            }
-        }
-
-        'suggestion: {
-            let msg = "consider adding an explicit lifetime bound";
-
-            if (bound_kind, sub).has_infer_regions()
-                || (bound_kind, sub).has_placeholders()
-                || !bound_kind.is_suggestable(self.tcx, false)
-            {
-                let lt_name = sub.get_name_or_anon().to_string();
-                err.help(format!("{msg} `{bound_kind}: {lt_name}`..."));
-                break 'suggestion;
-            }
-
-            let mut generic_param_scope = generic_param_scope;
-            while self.tcx.def_kind(generic_param_scope) == DefKind::OpaqueTy {
-                generic_param_scope = self.tcx.local_parent(generic_param_scope);
-            }
-
-            // type_param_sugg_span is (span, has_bounds, needs_parentheses)
-            let (type_scope, type_param_sugg_span) = match bound_kind {
-                GenericKind::Param(param) => {
-                    let generics = self.tcx.generics_of(generic_param_scope);
-                    let type_param = generics.type_param(param, self.tcx);
-                    let def_id = type_param.def_id.expect_local();
-                    let scope = self.tcx.local_def_id_to_hir_id(def_id).owner.def_id;
-                    // Get the `hir::Param` to verify whether it already has any bounds.
-                    // We do this to avoid suggesting code that ends up as `T: 'a'b`,
-                    // instead we suggest `T: 'a + 'b` in that case.
-                    let hir_generics = self.tcx.hir().get_generics(scope).unwrap();
-                    let sugg_span = match hir_generics.bounds_span_for_suggestions(def_id) {
-                        Some((span, open_paren_sp)) => Some((span, true, open_paren_sp)),
-                        // If `param` corresponds to `Self`, no usable suggestion span.
-                        None if generics.has_self && param.index == 0 => None,
-                        None => {
-                            let span = if let Some(param) =
-                                hir_generics.params.iter().find(|param| param.def_id == def_id)
-                                && let ParamName::Plain(ident) = param.name
-                            {
-                                ident.span.shrink_to_hi()
-                            } else {
-                                let span = self.tcx.def_span(def_id);
-                                span.shrink_to_hi()
-                            };
-                            Some((span, false, None))
-                        }
-                    };
-                    (scope, sugg_span)
-                }
-                _ => (generic_param_scope, None),
-            };
-            let suggestion_scope = {
-                let lifetime_scope = match sub.kind() {
-                    ty::ReStatic => hir::def_id::CRATE_DEF_ID,
-                    _ => match self.tcx.is_suitable_region(generic_param_scope, sub) {
-                        Some(info) => info.def_id,
-                        None => generic_param_scope,
-                    },
-                };
-                match self.tcx.is_descendant_of(type_scope.into(), lifetime_scope.into()) {
-                    true => type_scope,
-                    false => lifetime_scope,
-                }
-            };
-
-            let mut suggs = vec![];
-            let lt_name = self.suggest_name_region(generic_param_scope, sub, &mut suggs);
-
-            if let Some((sp, has_lifetimes, open_paren_sp)) = type_param_sugg_span
-                && suggestion_scope == type_scope
-            {
-                let suggestion =
-                    if has_lifetimes { format!(" + {lt_name}") } else { format!(": {lt_name}") };
-
-                if let Some(open_paren_sp) = open_paren_sp {
-                    suggs.push((open_paren_sp, "(".to_string()));
-                    suggs.push((sp, format!("){suggestion}")));
-                } else {
-                    suggs.push((sp, suggestion))
-                }
-            } else if let GenericKind::Alias(ref p) = bound_kind
-                && let ty::Projection = p.kind(self.tcx)
-                && let DefKind::AssocTy = self.tcx.def_kind(p.def_id)
-                && let Some(ty::ImplTraitInTraitData::Trait { .. }) =
-                    self.tcx.opt_rpitit_info(p.def_id)
-            {
-                // The lifetime found in the `impl` is longer than the one on the RPITIT.
-                // Do not suggest `<Type as Trait>::{opaque}: 'static`.
-            } else if let Some(generics) = self.tcx.hir().get_generics(suggestion_scope) {
-                let pred = format!("{bound_kind}: {lt_name}");
-                let suggestion = format!("{} {}", generics.add_where_or_trailing_comma(), pred);
-                suggs.push((generics.tail_span_for_predicate_suggestion(), suggestion))
-            } else {
-                let consider = format!("{msg} `{bound_kind}: {sub}`...");
-                err.help(consider);
-            }
-
-            if !suggs.is_empty() {
-                err.multipart_suggestion_verbose(
-                    msg,
-                    suggs,
-                    Applicability::MaybeIncorrect, // Issue #41966
-                );
-            }
-        }
-
-        err
-    }
-
-    pub fn suggest_name_region(
-        &self,
-        generic_param_scope: LocalDefId,
-        lifetime: Region<'tcx>,
-        add_lt_suggs: &mut Vec<(Span, String)>,
-    ) -> String {
-        struct LifetimeReplaceVisitor<'tcx, 'a> {
-            tcx: TyCtxt<'tcx>,
-            needle: hir::LifetimeName,
-            new_lt: &'a str,
-            add_lt_suggs: &'a mut Vec<(Span, String)>,
-        }
-
-        impl<'hir, 'tcx> hir::intravisit::Visitor<'hir> for LifetimeReplaceVisitor<'tcx, '_> {
-            fn visit_lifetime(&mut self, lt: &'hir hir::Lifetime) {
-                if lt.res == self.needle {
-                    let (pos, span) = lt.suggestion_position();
-                    let new_lt = &self.new_lt;
-                    let sugg = match pos {
-                        hir::LifetimeSuggestionPosition::Normal => format!("{new_lt}"),
-                        hir::LifetimeSuggestionPosition::Ampersand => format!("{new_lt} "),
-                        hir::LifetimeSuggestionPosition::ElidedPath => format!("<{new_lt}>"),
-                        hir::LifetimeSuggestionPosition::ElidedPathArgument => {
-                            format!("{new_lt}, ")
-                        }
-                        hir::LifetimeSuggestionPosition::ObjectDefault => format!("+ {new_lt}"),
-                    };
-                    self.add_lt_suggs.push((span, sugg));
-                }
-            }
-
-            fn visit_ty(&mut self, ty: &'hir hir::Ty<'hir>) {
-                let hir::TyKind::OpaqueDef(item_id, _, _) = ty.kind else {
-                    return hir::intravisit::walk_ty(self, ty);
-                };
-                let opaque_ty = self.tcx.hir().item(item_id).expect_opaque_ty();
-                if let Some(&(_, b)) =
-                    opaque_ty.lifetime_mapping.iter().find(|&(a, _)| a.res == self.needle)
-                {
-                    let prev_needle =
-                        std::mem::replace(&mut self.needle, hir::LifetimeName::Param(b));
-                    for bound in opaque_ty.bounds {
-                        self.visit_param_bound(bound);
-                    }
-                    self.needle = prev_needle;
-                }
-            }
-        }
-
-        let (lifetime_def_id, lifetime_scope) =
-            match self.tcx.is_suitable_region(generic_param_scope, lifetime) {
-                Some(info) if !lifetime.has_name() => {
-                    (info.bound_region.get_id().unwrap().expect_local(), info.def_id)
-                }
-                _ => return lifetime.get_name_or_anon().to_string(),
-            };
-
-        let new_lt = {
-            let generics = self.tcx.generics_of(lifetime_scope);
-            let mut used_names =
-                iter::successors(Some(generics), |g| g.parent.map(|p| self.tcx.generics_of(p)))
-                    .flat_map(|g| &g.own_params)
-                    .filter(|p| matches!(p.kind, ty::GenericParamDefKind::Lifetime))
-                    .map(|p| p.name)
-                    .collect::<Vec<_>>();
-            let hir_id = self.tcx.local_def_id_to_hir_id(lifetime_scope);
-            // consider late-bound lifetimes ...
-            used_names.extend(self.tcx.late_bound_vars(hir_id).into_iter().filter_map(
-                |p| match p {
-                    ty::BoundVariableKind::Region(lt) => lt.get_name(),
-                    _ => None,
-                },
-            ));
-            (b'a'..=b'z')
-                .map(|c| format!("'{}", c as char))
-                .find(|candidate| !used_names.iter().any(|e| e.as_str() == candidate))
-                .unwrap_or("'lt".to_string())
-        };
-
-        let mut visitor = LifetimeReplaceVisitor {
-            tcx: self.tcx,
-            needle: hir::LifetimeName::Param(lifetime_def_id),
-            add_lt_suggs,
-            new_lt: &new_lt,
-        };
-        match self.tcx.expect_hir_owner_node(lifetime_scope) {
-            hir::OwnerNode::Item(i) => visitor.visit_item(i),
-            hir::OwnerNode::ForeignItem(i) => visitor.visit_foreign_item(i),
-            hir::OwnerNode::ImplItem(i) => visitor.visit_impl_item(i),
-            hir::OwnerNode::TraitItem(i) => visitor.visit_trait_item(i),
-            hir::OwnerNode::Crate(_) => bug!("OwnerNode::Crate doesn't not have generics"),
-            hir::OwnerNode::Synthetic => unreachable!(),
-        }
-
-        let ast_generics = self.tcx.hir().get_generics(lifetime_scope).unwrap();
-        let sugg = ast_generics
-            .span_for_lifetime_suggestion()
-            .map(|span| (span, format!("{new_lt}, ")))
-            .unwrap_or_else(|| (ast_generics.span, format!("<{new_lt}>")));
-        add_lt_suggs.push(sugg);
-
-        new_lt
-    }
-
-    fn report_sub_sup_conflict(
-        &self,
-        generic_param_scope: LocalDefId,
-        var_origin: RegionVariableOrigin,
-        sub_origin: SubregionOrigin<'tcx>,
-        sub_region: Region<'tcx>,
-        sup_origin: SubregionOrigin<'tcx>,
-        sup_region: Region<'tcx>,
-    ) -> ErrorGuaranteed {
-        let mut err = self.report_inference_failure(var_origin);
-
-        note_and_explain_region(
-            self.tcx,
-            &mut err,
-            generic_param_scope,
-            "first, the lifetime cannot outlive ",
-            sup_region,
-            "...",
-            None,
-        );
-
-        debug!("report_sub_sup_conflict: var_origin={:?}", var_origin);
-        debug!("report_sub_sup_conflict: sub_region={:?}", sub_region);
-        debug!("report_sub_sup_conflict: sub_origin={:?}", sub_origin);
-        debug!("report_sub_sup_conflict: sup_region={:?}", sup_region);
-        debug!("report_sub_sup_conflict: sup_origin={:?}", sup_origin);
-
-        if let infer::Subtype(ref sup_trace) = sup_origin
-            && let infer::Subtype(ref sub_trace) = sub_origin
-            && let Some((sup_expected, sup_found, _)) = self.values_str(sup_trace.values)
-            && let Some((sub_expected, sub_found, _)) = self.values_str(sub_trace.values)
-            && sub_expected == sup_expected
-            && sub_found == sup_found
-        {
-            note_and_explain_region(
-                self.tcx,
-                &mut err,
-                generic_param_scope,
-                "...but the lifetime must also be valid for ",
-                sub_region,
-                "...",
-                None,
-            );
-            err.span_note(
-                sup_trace.cause.span,
-                format!("...so that the {}", sup_trace.cause.as_requirement_str()),
-            );
-
-            err.note_expected_found(&"", sup_expected, &"", sup_found);
-            return if sub_region.is_error() | sup_region.is_error() {
-                err.delay_as_bug()
-            } else {
-                err.emit()
-            };
-        }
-
-        self.note_region_origin(&mut err, &sup_origin);
-
-        note_and_explain_region(
-            self.tcx,
-            &mut err,
-            generic_param_scope,
-            "but, the lifetime must be valid for ",
-            sub_region,
-            "...",
-            None,
-        );
-
-        self.note_region_origin(&mut err, &sub_origin);
-        if sub_region.is_error() | sup_region.is_error() { err.delay_as_bug() } else { err.emit() }
-    }
-
     /// Determine whether an error associated with the given span and definition
     /// should be treated as being caused by the implicit `From` conversion
     /// within `?` desugaring.
@@ -2792,55 +2008,6 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for SameTypeModuloInfer<'_, 'tcx> {
     }
 }
 
-impl<'tcx> InferCtxt<'tcx> {
-    fn report_inference_failure(&self, var_origin: RegionVariableOrigin) -> Diag<'_> {
-        let br_string = |br: ty::BoundRegionKind| {
-            let mut s = match br {
-                ty::BrNamed(_, name) => name.to_string(),
-                _ => String::new(),
-            };
-            if !s.is_empty() {
-                s.push(' ');
-            }
-            s
-        };
-        let var_description = match var_origin {
-            infer::MiscVariable(_) => String::new(),
-            infer::PatternRegion(_) => " for pattern".to_string(),
-            infer::AddrOfRegion(_) => " for borrow expression".to_string(),
-            infer::Autoref(_) => " for autoref".to_string(),
-            infer::Coercion(_) => " for automatic coercion".to_string(),
-            infer::BoundRegion(_, br, infer::FnCall) => {
-                format!(" for lifetime parameter {}in function call", br_string(br))
-            }
-            infer::BoundRegion(_, br, infer::HigherRankedType) => {
-                format!(" for lifetime parameter {}in generic type", br_string(br))
-            }
-            infer::BoundRegion(_, br, infer::AssocTypeProjection(def_id)) => format!(
-                " for lifetime parameter {}in trait containing associated type `{}`",
-                br_string(br),
-                self.tcx.associated_item(def_id).name
-            ),
-            infer::RegionParameterDefinition(_, name) => {
-                format!(" for lifetime parameter `{name}`")
-            }
-            infer::UpvarRegion(ref upvar_id, _) => {
-                let var_name = self.tcx.hir().name(upvar_id.var_path.hir_id);
-                format!(" for capture of `{var_name}` by closure")
-            }
-            infer::Nll(..) => bug!("NLL variable found in lexical phase"),
-        };
-
-        struct_span_code_err!(
-            self.dcx(),
-            var_origin.span(),
-            E0495,
-            "cannot infer an appropriate lifetime{} due to conflicting requirements",
-            var_description
-        )
-    }
-}
-
 pub enum FailureCode {
     Error0317,
     Error0580,
diff --git a/compiler/rustc_infer/src/infer/error_reporting/note.rs b/compiler/rustc_infer/src/infer/error_reporting/note.rs
deleted file mode 100644
index d1fc9c9f140b1..0000000000000
--- a/compiler/rustc_infer/src/infer/error_reporting/note.rs
+++ /dev/null
@@ -1,421 +0,0 @@
-use crate::errors::{
-    note_and_explain, FulfillReqLifetime, LfBoundNotSatisfied, OutlivesBound, OutlivesContent,
-    RefLongerThanData, RegionOriginNote, WhereClauseSuggestions,
-};
-use crate::fluent_generated as fluent;
-use crate::infer::error_reporting::{note_and_explain_region, TypeErrCtxt};
-use crate::infer::{self, SubregionOrigin};
-use rustc_errors::{Diag, Subdiagnostic};
-use rustc_hir::def_id::{DefId, LocalDefId};
-use rustc_middle::traits::ObligationCauseCode;
-use rustc_middle::ty::error::TypeError;
-use rustc_middle::ty::{self, IsSuggestable, Region, Ty};
-use rustc_span::symbol::kw;
-
-use super::ObligationCauseAsDiagArg;
-
-impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
-    pub(super) fn note_region_origin(&self, err: &mut Diag<'_>, origin: &SubregionOrigin<'tcx>) {
-        match *origin {
-            infer::Subtype(ref trace) => RegionOriginNote::WithRequirement {
-                span: trace.cause.span,
-                requirement: ObligationCauseAsDiagArg(trace.cause.clone()),
-                expected_found: self.values_str(trace.values).map(|(e, f, _)| (e, f)),
-            }
-            .add_to_diag(err),
-            infer::Reborrow(span) => {
-                RegionOriginNote::Plain { span, msg: fluent::infer_reborrow }.add_to_diag(err)
-            }
-            infer::RelateObjectBound(span) => {
-                RegionOriginNote::Plain { span, msg: fluent::infer_relate_object_bound }
-                    .add_to_diag(err);
-            }
-            infer::ReferenceOutlivesReferent(ty, span) => {
-                RegionOriginNote::WithName {
-                    span,
-                    msg: fluent::infer_reference_outlives_referent,
-                    name: &self.ty_to_string(ty),
-                    continues: false,
-                }
-                .add_to_diag(err);
-            }
-            infer::RelateParamBound(span, ty, opt_span) => {
-                RegionOriginNote::WithName {
-                    span,
-                    msg: fluent::infer_relate_param_bound,
-                    name: &self.ty_to_string(ty),
-                    continues: opt_span.is_some(),
-                }
-                .add_to_diag(err);
-                if let Some(span) = opt_span {
-                    RegionOriginNote::Plain { span, msg: fluent::infer_relate_param_bound_2 }
-                        .add_to_diag(err);
-                }
-            }
-            infer::RelateRegionParamBound(span) => {
-                RegionOriginNote::Plain { span, msg: fluent::infer_relate_region_param_bound }
-                    .add_to_diag(err);
-            }
-            infer::CompareImplItemObligation { span, .. } => {
-                RegionOriginNote::Plain { span, msg: fluent::infer_compare_impl_item_obligation }
-                    .add_to_diag(err);
-            }
-            infer::CheckAssociatedTypeBounds { ref parent, .. } => {
-                self.note_region_origin(err, parent);
-            }
-            infer::AscribeUserTypeProvePredicate(span) => {
-                RegionOriginNote::Plain {
-                    span,
-                    msg: fluent::infer_ascribe_user_type_prove_predicate,
-                }
-                .add_to_diag(err);
-            }
-        }
-    }
-
-    pub(super) fn report_concrete_failure(
-        &self,
-        generic_param_scope: LocalDefId,
-        origin: SubregionOrigin<'tcx>,
-        sub: Region<'tcx>,
-        sup: Region<'tcx>,
-    ) -> Diag<'a> {
-        let mut err = match origin {
-            infer::Subtype(box trace) => {
-                let terr = TypeError::RegionsDoesNotOutlive(sup, sub);
-                let mut err = self.report_and_explain_type_error(trace, terr);
-                match (*sub, *sup) {
-                    (ty::RePlaceholder(_), ty::RePlaceholder(_)) => {}
-                    (ty::RePlaceholder(_), _) => {
-                        note_and_explain_region(
-                            self.tcx,
-                            &mut err,
-                            generic_param_scope,
-                            "",
-                            sup,
-                            " doesn't meet the lifetime requirements",
-                            None,
-                        );
-                    }
-                    (_, ty::RePlaceholder(_)) => {
-                        note_and_explain_region(
-                            self.tcx,
-                            &mut err,
-                            generic_param_scope,
-                            "the required lifetime does not necessarily outlive ",
-                            sub,
-                            "",
-                            None,
-                        );
-                    }
-                    _ => {
-                        note_and_explain_region(
-                            self.tcx,
-                            &mut err,
-                            generic_param_scope,
-                            "",
-                            sup,
-                            "...",
-                            None,
-                        );
-                        note_and_explain_region(
-                            self.tcx,
-                            &mut err,
-                            generic_param_scope,
-                            "...does not necessarily outlive ",
-                            sub,
-                            "",
-                            None,
-                        );
-                    }
-                }
-                err
-            }
-            infer::Reborrow(span) => {
-                let reference_valid = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sub,
-                    None,
-                    note_and_explain::PrefixKind::RefValidFor,
-                    note_and_explain::SuffixKind::Continues,
-                );
-                let content_valid = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sup,
-                    None,
-                    note_and_explain::PrefixKind::ContentValidFor,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                self.dcx().create_err(OutlivesContent {
-                    span,
-                    notes: reference_valid.into_iter().chain(content_valid).collect(),
-                })
-            }
-            infer::RelateObjectBound(span) => {
-                let object_valid = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sub,
-                    None,
-                    note_and_explain::PrefixKind::TypeObjValidFor,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                let pointer_valid = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sup,
-                    None,
-                    note_and_explain::PrefixKind::SourcePointerValidFor,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                self.dcx().create_err(OutlivesBound {
-                    span,
-                    notes: object_valid.into_iter().chain(pointer_valid).collect(),
-                })
-            }
-            infer::RelateParamBound(span, ty, opt_span) => {
-                let prefix = match *sub {
-                    ty::ReStatic => note_and_explain::PrefixKind::TypeSatisfy,
-                    _ => note_and_explain::PrefixKind::TypeOutlive,
-                };
-                let suffix = if opt_span.is_some() {
-                    note_and_explain::SuffixKind::ReqByBinding
-                } else {
-                    note_and_explain::SuffixKind::Empty
-                };
-                let note = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sub,
-                    opt_span,
-                    prefix,
-                    suffix,
-                );
-                self.dcx().create_err(FulfillReqLifetime {
-                    span,
-                    ty: self.resolve_vars_if_possible(ty),
-                    note,
-                })
-            }
-            infer::RelateRegionParamBound(span) => {
-                let param_instantiated = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sup,
-                    None,
-                    note_and_explain::PrefixKind::LfParamInstantiatedWith,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                let param_must_outlive = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sub,
-                    None,
-                    note_and_explain::PrefixKind::LfParamMustOutlive,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                self.dcx().create_err(LfBoundNotSatisfied {
-                    span,
-                    notes: param_instantiated.into_iter().chain(param_must_outlive).collect(),
-                })
-            }
-            infer::ReferenceOutlivesReferent(ty, span) => {
-                let pointer_valid = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sub,
-                    None,
-                    note_and_explain::PrefixKind::PointerValidFor,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                let data_valid = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sup,
-                    None,
-                    note_and_explain::PrefixKind::DataValidFor,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                self.dcx().create_err(RefLongerThanData {
-                    span,
-                    ty: self.resolve_vars_if_possible(ty),
-                    notes: pointer_valid.into_iter().chain(data_valid).collect(),
-                })
-            }
-            infer::CompareImplItemObligation { span, impl_item_def_id, trait_item_def_id } => {
-                let mut err = self.infcx.report_extra_impl_obligation(
-                    span,
-                    impl_item_def_id,
-                    trait_item_def_id,
-                    &format!("`{sup}: {sub}`"),
-                );
-                // We should only suggest rewriting the `where` clause if the predicate is within that `where` clause
-                if let Some(generics) = self.tcx.hir().get_generics(impl_item_def_id)
-                    && generics.where_clause_span.contains(span)
-                {
-                    self.suggest_copy_trait_method_bounds(
-                        trait_item_def_id,
-                        impl_item_def_id,
-                        &mut err,
-                    );
-                }
-                err
-            }
-            infer::CheckAssociatedTypeBounds { impl_item_def_id, trait_item_def_id, parent } => {
-                let mut err = self.report_concrete_failure(generic_param_scope, *parent, sub, sup);
-
-                // Don't mention the item name if it's an RPITIT, since that'll just confuse
-                // folks.
-                if !self.tcx.is_impl_trait_in_trait(impl_item_def_id.to_def_id()) {
-                    let trait_item_span = self.tcx.def_span(trait_item_def_id);
-                    let item_name = self.tcx.item_name(impl_item_def_id.to_def_id());
-                    err.span_label(
-                        trait_item_span,
-                        format!("definition of `{item_name}` from trait"),
-                    );
-                }
-
-                self.suggest_copy_trait_method_bounds(
-                    trait_item_def_id,
-                    impl_item_def_id,
-                    &mut err,
-                );
-                err
-            }
-            infer::AscribeUserTypeProvePredicate(span) => {
-                let instantiated = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sup,
-                    None,
-                    note_and_explain::PrefixKind::LfInstantiatedWith,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                let must_outlive = note_and_explain::RegionExplanation::new(
-                    self.tcx,
-                    generic_param_scope,
-                    sub,
-                    None,
-                    note_and_explain::PrefixKind::LfMustOutlive,
-                    note_and_explain::SuffixKind::Empty,
-                );
-                self.dcx().create_err(LfBoundNotSatisfied {
-                    span,
-                    notes: instantiated.into_iter().chain(must_outlive).collect(),
-                })
-            }
-        };
-        if sub.is_error() || sup.is_error() {
-            err.downgrade_to_delayed_bug();
-        }
-        err
-    }
-
-    pub fn suggest_copy_trait_method_bounds(
-        &self,
-        trait_item_def_id: DefId,
-        impl_item_def_id: LocalDefId,
-        err: &mut Diag<'_>,
-    ) {
-        // FIXME(compiler-errors): Right now this is only being used for region
-        // predicate mismatches. Ideally, we'd use it for *all* predicate mismatches,
-        // but right now it's not really very smart when it comes to implicit `Sized`
-        // predicates and bounds on the trait itself.
-
-        let Some(impl_def_id) = self.tcx.associated_item(impl_item_def_id).impl_container(self.tcx)
-        else {
-            return;
-        };
-        let Some(trait_ref) = self.tcx.impl_trait_ref(impl_def_id) else {
-            return;
-        };
-        let trait_args = trait_ref
-            .instantiate_identity()
-            // Replace the explicit self type with `Self` for better suggestion rendering
-            .with_self_ty(self.tcx, Ty::new_param(self.tcx, 0, kw::SelfUpper))
-            .args;
-        let trait_item_args = ty::GenericArgs::identity_for_item(self.tcx, impl_item_def_id)
-            .rebase_onto(self.tcx, impl_def_id, trait_args);
-
-        let Ok(trait_predicates) =
-            self.tcx
-                .explicit_predicates_of(trait_item_def_id)
-                .instantiate_own(self.tcx, trait_item_args)
-                .map(|(pred, _)| {
-                    if pred.is_suggestable(self.tcx, false) {
-                        Ok(pred.to_string())
-                    } else {
-                        Err(())
-                    }
-                })
-                .collect::<Result<Vec<_>, ()>>()
-        else {
-            return;
-        };
-
-        let Some(generics) = self.tcx.hir().get_generics(impl_item_def_id) else {
-            return;
-        };
-
-        let suggestion = if trait_predicates.is_empty() {
-            WhereClauseSuggestions::Remove { span: generics.where_clause_span }
-        } else {
-            let space = if generics.where_clause_span.is_empty() { " " } else { "" };
-            WhereClauseSuggestions::CopyPredicates {
-                span: generics.where_clause_span,
-                space,
-                trait_predicates: trait_predicates.join(", "),
-            }
-        };
-        err.subdiagnostic(suggestion);
-    }
-
-    pub(super) fn report_placeholder_failure(
-        &self,
-        generic_param_scope: LocalDefId,
-        placeholder_origin: SubregionOrigin<'tcx>,
-        sub: Region<'tcx>,
-        sup: Region<'tcx>,
-    ) -> Diag<'a> {
-        // I can't think how to do better than this right now. -nikomatsakis
-        debug!(?placeholder_origin, ?sub, ?sup, "report_placeholder_failure");
-        match placeholder_origin {
-            infer::Subtype(box ref trace)
-                if matches!(
-                    &trace.cause.code().peel_derives(),
-                    ObligationCauseCode::WhereClause(..)
-                        | ObligationCauseCode::WhereClauseInExpr(..)
-                ) =>
-            {
-                // Hack to get around the borrow checker because trace.cause has an `Rc`.
-                if let ObligationCauseCode::WhereClause(_, span)
-                | ObligationCauseCode::WhereClauseInExpr(_, span, ..) =
-                    &trace.cause.code().peel_derives()
-                    && !span.is_dummy()
-                {
-                    let span = *span;
-                    self.report_concrete_failure(generic_param_scope, placeholder_origin, sub, sup)
-                        .with_span_note(span, "the lifetime requirement is introduced here")
-                } else {
-                    unreachable!(
-                        "control flow ensures we have a `BindingObligation` or `WhereClauseInExpr` here..."
-                    )
-                }
-            }
-            infer::Subtype(box trace) => {
-                let terr = TypeError::RegionsPlaceholderMismatch;
-                return self.report_and_explain_type_error(trace, terr);
-            }
-            _ => {
-                return self.report_concrete_failure(
-                    generic_param_scope,
-                    placeholder_origin,
-                    sub,
-                    sup,
-                );
-            }
-        }
-    }
-}
diff --git a/compiler/rustc_infer/src/infer/error_reporting/region.rs b/compiler/rustc_infer/src/infer/error_reporting/region.rs
new file mode 100644
index 0000000000000..5a465f46e47dc
--- /dev/null
+++ b/compiler/rustc_infer/src/infer/error_reporting/region.rs
@@ -0,0 +1,1259 @@
+use std::iter;
+
+use rustc_errors::{
+    struct_span_code_err, Applicability, Diag, Subdiagnostic, E0309, E0310, E0311, E0495,
+};
+use rustc_hir::def::DefKind;
+use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::intravisit::Visitor;
+use rustc_hir::{self as hir, ParamName};
+use rustc_middle::bug;
+use rustc_middle::traits::ObligationCauseCode;
+use rustc_middle::ty::error::TypeError;
+use rustc_middle::ty::{self, IsSuggestable, Region, Ty, TyCtxt, TypeVisitableExt as _};
+use rustc_span::symbol::kw;
+use rustc_span::{ErrorGuaranteed, Span};
+use rustc_type_ir::Upcast as _;
+
+use super::nice_region_error::find_anon_type;
+use super::{nice_region_error, ObligationCauseAsDiagArg};
+use crate::errors::{
+    self, note_and_explain, FulfillReqLifetime, LfBoundNotSatisfied, OutlivesBound,
+    OutlivesContent, RefLongerThanData, RegionOriginNote, WhereClauseSuggestions,
+};
+use crate::fluent_generated as fluent;
+use crate::infer::error_reporting::{ObligationCauseExt as _, TypeErrCtxt};
+use crate::infer::region_constraints::GenericKind;
+use crate::infer::{self, InferCtxt, RegionResolutionError, RegionVariableOrigin, SubregionOrigin};
+
+impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
+    pub fn report_region_errors(
+        &self,
+        generic_param_scope: LocalDefId,
+        errors: &[RegionResolutionError<'tcx>],
+    ) -> ErrorGuaranteed {
+        assert!(!errors.is_empty());
+
+        if let Some(guaranteed) = self.infcx.tainted_by_errors() {
+            return guaranteed;
+        }
+
+        debug!("report_region_errors(): {} errors to start", errors.len());
+
+        // try to pre-process the errors, which will group some of them
+        // together into a `ProcessedErrors` group:
+        let errors = self.process_errors(errors);
+
+        debug!("report_region_errors: {} errors after preprocessing", errors.len());
+
+        let mut guar = None;
+        for error in errors {
+            debug!("report_region_errors: error = {:?}", error);
+
+            let e = if let Some(guar) =
+                self.try_report_nice_region_error(generic_param_scope, &error)
+            {
+                guar
+            } else {
+                match error.clone() {
+                    // These errors could indicate all manner of different
+                    // problems with many different solutions. Rather
+                    // than generate a "one size fits all" error, what we
+                    // attempt to do is go through a number of specific
+                    // scenarios and try to find the best way to present
+                    // the error. If all of these fails, we fall back to a rather
+                    // general bit of code that displays the error information
+                    RegionResolutionError::ConcreteFailure(origin, sub, sup) => {
+                        if sub.is_placeholder() || sup.is_placeholder() {
+                            self.report_placeholder_failure(generic_param_scope, origin, sub, sup)
+                                .emit()
+                        } else {
+                            self.report_concrete_failure(generic_param_scope, origin, sub, sup)
+                                .emit()
+                        }
+                    }
+
+                    RegionResolutionError::GenericBoundFailure(origin, param_ty, sub) => self
+                        .report_generic_bound_failure(
+                            generic_param_scope,
+                            origin.span(),
+                            Some(origin),
+                            param_ty,
+                            sub,
+                        ),
+
+                    RegionResolutionError::SubSupConflict(
+                        _,
+                        var_origin,
+                        sub_origin,
+                        sub_r,
+                        sup_origin,
+                        sup_r,
+                        _,
+                    ) => {
+                        if sub_r.is_placeholder() {
+                            self.report_placeholder_failure(
+                                generic_param_scope,
+                                sub_origin,
+                                sub_r,
+                                sup_r,
+                            )
+                            .emit()
+                        } else if sup_r.is_placeholder() {
+                            self.report_placeholder_failure(
+                                generic_param_scope,
+                                sup_origin,
+                                sub_r,
+                                sup_r,
+                            )
+                            .emit()
+                        } else {
+                            self.report_sub_sup_conflict(
+                                generic_param_scope,
+                                var_origin,
+                                sub_origin,
+                                sub_r,
+                                sup_origin,
+                                sup_r,
+                            )
+                        }
+                    }
+
+                    RegionResolutionError::UpperBoundUniverseConflict(
+                        _,
+                        _,
+                        _,
+                        sup_origin,
+                        sup_r,
+                    ) => {
+                        assert!(sup_r.is_placeholder());
+
+                        // Make a dummy value for the "sub region" --
+                        // this is the initial value of the
+                        // placeholder. In practice, we expect more
+                        // tailored errors that don't really use this
+                        // value.
+                        let sub_r = self.tcx.lifetimes.re_erased;
+
+                        self.report_placeholder_failure(
+                            generic_param_scope,
+                            sup_origin,
+                            sub_r,
+                            sup_r,
+                        )
+                        .emit()
+                    }
+
+                    RegionResolutionError::CannotNormalize(clause, origin) => {
+                        let clause: ty::Clause<'tcx> =
+                            clause.map_bound(ty::ClauseKind::TypeOutlives).upcast(self.tcx);
+                        self.tcx
+                            .dcx()
+                            .struct_span_err(origin.span(), format!("cannot normalize `{clause}`"))
+                            .emit()
+                    }
+                }
+            };
+
+            guar = Some(e)
+        }
+
+        guar.unwrap()
+    }
+
+    // This method goes through all the errors and try to group certain types
+    // of error together, for the purpose of suggesting explicit lifetime
+    // parameters to the user. This is done so that we can have a more
+    // complete view of what lifetimes should be the same.
+    // If the return value is an empty vector, it means that processing
+    // failed (so the return value of this method should not be used).
+    //
+    // The method also attempts to weed out messages that seem like
+    // duplicates that will be unhelpful to the end-user. But
+    // obviously it never weeds out ALL errors.
+    fn process_errors(
+        &self,
+        errors: &[RegionResolutionError<'tcx>],
+    ) -> Vec<RegionResolutionError<'tcx>> {
+        debug!("process_errors()");
+
+        // We want to avoid reporting generic-bound failures if we can
+        // avoid it: these have a very high rate of being unhelpful in
+        // practice. This is because they are basically secondary
+        // checks that test the state of the region graph after the
+        // rest of inference is done, and the other kinds of errors
+        // indicate that the region constraint graph is internally
+        // inconsistent, so these test results are likely to be
+        // meaningless.
+        //
+        // Therefore, we filter them out of the list unless they are
+        // the only thing in the list.
+
+        let is_bound_failure = |e: &RegionResolutionError<'tcx>| match *e {
+            RegionResolutionError::GenericBoundFailure(..) => true,
+            RegionResolutionError::ConcreteFailure(..)
+            | RegionResolutionError::SubSupConflict(..)
+            | RegionResolutionError::UpperBoundUniverseConflict(..)
+            | RegionResolutionError::CannotNormalize(..) => false,
+        };
+
+        let mut errors = if errors.iter().all(|e| is_bound_failure(e)) {
+            errors.to_owned()
+        } else {
+            errors.iter().filter(|&e| !is_bound_failure(e)).cloned().collect()
+        };
+
+        // sort the errors by span, for better error message stability.
+        errors.sort_by_key(|u| match *u {
+            RegionResolutionError::ConcreteFailure(ref sro, _, _) => sro.span(),
+            RegionResolutionError::GenericBoundFailure(ref sro, _, _) => sro.span(),
+            RegionResolutionError::SubSupConflict(_, ref rvo, _, _, _, _, _) => rvo.span(),
+            RegionResolutionError::UpperBoundUniverseConflict(_, ref rvo, _, _, _) => rvo.span(),
+            RegionResolutionError::CannotNormalize(_, ref sro) => sro.span(),
+        });
+        errors
+    }
+
+    pub(super) fn note_region_origin(&self, err: &mut Diag<'_>, origin: &SubregionOrigin<'tcx>) {
+        match *origin {
+            infer::Subtype(ref trace) => RegionOriginNote::WithRequirement {
+                span: trace.cause.span,
+                requirement: ObligationCauseAsDiagArg(trace.cause.clone()),
+                expected_found: self.values_str(trace.values).map(|(e, f, _)| (e, f)),
+            }
+            .add_to_diag(err),
+            infer::Reborrow(span) => {
+                RegionOriginNote::Plain { span, msg: fluent::infer_reborrow }.add_to_diag(err)
+            }
+            infer::RelateObjectBound(span) => {
+                RegionOriginNote::Plain { span, msg: fluent::infer_relate_object_bound }
+                    .add_to_diag(err);
+            }
+            infer::ReferenceOutlivesReferent(ty, span) => {
+                RegionOriginNote::WithName {
+                    span,
+                    msg: fluent::infer_reference_outlives_referent,
+                    name: &self.ty_to_string(ty),
+                    continues: false,
+                }
+                .add_to_diag(err);
+            }
+            infer::RelateParamBound(span, ty, opt_span) => {
+                RegionOriginNote::WithName {
+                    span,
+                    msg: fluent::infer_relate_param_bound,
+                    name: &self.ty_to_string(ty),
+                    continues: opt_span.is_some(),
+                }
+                .add_to_diag(err);
+                if let Some(span) = opt_span {
+                    RegionOriginNote::Plain { span, msg: fluent::infer_relate_param_bound_2 }
+                        .add_to_diag(err);
+                }
+            }
+            infer::RelateRegionParamBound(span) => {
+                RegionOriginNote::Plain { span, msg: fluent::infer_relate_region_param_bound }
+                    .add_to_diag(err);
+            }
+            infer::CompareImplItemObligation { span, .. } => {
+                RegionOriginNote::Plain { span, msg: fluent::infer_compare_impl_item_obligation }
+                    .add_to_diag(err);
+            }
+            infer::CheckAssociatedTypeBounds { ref parent, .. } => {
+                self.note_region_origin(err, parent);
+            }
+            infer::AscribeUserTypeProvePredicate(span) => {
+                RegionOriginNote::Plain {
+                    span,
+                    msg: fluent::infer_ascribe_user_type_prove_predicate,
+                }
+                .add_to_diag(err);
+            }
+        }
+    }
+
+    pub(super) fn report_concrete_failure(
+        &self,
+        generic_param_scope: LocalDefId,
+        origin: SubregionOrigin<'tcx>,
+        sub: Region<'tcx>,
+        sup: Region<'tcx>,
+    ) -> Diag<'a> {
+        let mut err = match origin {
+            infer::Subtype(box trace) => {
+                let terr = TypeError::RegionsDoesNotOutlive(sup, sub);
+                let mut err = self.report_and_explain_type_error(trace, terr);
+                match (*sub, *sup) {
+                    (ty::RePlaceholder(_), ty::RePlaceholder(_)) => {}
+                    (ty::RePlaceholder(_), _) => {
+                        note_and_explain_region(
+                            self.tcx,
+                            &mut err,
+                            generic_param_scope,
+                            "",
+                            sup,
+                            " doesn't meet the lifetime requirements",
+                            None,
+                        );
+                    }
+                    (_, ty::RePlaceholder(_)) => {
+                        note_and_explain_region(
+                            self.tcx,
+                            &mut err,
+                            generic_param_scope,
+                            "the required lifetime does not necessarily outlive ",
+                            sub,
+                            "",
+                            None,
+                        );
+                    }
+                    _ => {
+                        note_and_explain_region(
+                            self.tcx,
+                            &mut err,
+                            generic_param_scope,
+                            "",
+                            sup,
+                            "...",
+                            None,
+                        );
+                        note_and_explain_region(
+                            self.tcx,
+                            &mut err,
+                            generic_param_scope,
+                            "...does not necessarily outlive ",
+                            sub,
+                            "",
+                            None,
+                        );
+                    }
+                }
+                err
+            }
+            infer::Reborrow(span) => {
+                let reference_valid = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sub,
+                    None,
+                    note_and_explain::PrefixKind::RefValidFor,
+                    note_and_explain::SuffixKind::Continues,
+                );
+                let content_valid = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sup,
+                    None,
+                    note_and_explain::PrefixKind::ContentValidFor,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                self.dcx().create_err(OutlivesContent {
+                    span,
+                    notes: reference_valid.into_iter().chain(content_valid).collect(),
+                })
+            }
+            infer::RelateObjectBound(span) => {
+                let object_valid = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sub,
+                    None,
+                    note_and_explain::PrefixKind::TypeObjValidFor,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                let pointer_valid = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sup,
+                    None,
+                    note_and_explain::PrefixKind::SourcePointerValidFor,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                self.dcx().create_err(OutlivesBound {
+                    span,
+                    notes: object_valid.into_iter().chain(pointer_valid).collect(),
+                })
+            }
+            infer::RelateParamBound(span, ty, opt_span) => {
+                let prefix = match *sub {
+                    ty::ReStatic => note_and_explain::PrefixKind::TypeSatisfy,
+                    _ => note_and_explain::PrefixKind::TypeOutlive,
+                };
+                let suffix = if opt_span.is_some() {
+                    note_and_explain::SuffixKind::ReqByBinding
+                } else {
+                    note_and_explain::SuffixKind::Empty
+                };
+                let note = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sub,
+                    opt_span,
+                    prefix,
+                    suffix,
+                );
+                self.dcx().create_err(FulfillReqLifetime {
+                    span,
+                    ty: self.resolve_vars_if_possible(ty),
+                    note,
+                })
+            }
+            infer::RelateRegionParamBound(span) => {
+                let param_instantiated = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sup,
+                    None,
+                    note_and_explain::PrefixKind::LfParamInstantiatedWith,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                let param_must_outlive = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sub,
+                    None,
+                    note_and_explain::PrefixKind::LfParamMustOutlive,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                self.dcx().create_err(LfBoundNotSatisfied {
+                    span,
+                    notes: param_instantiated.into_iter().chain(param_must_outlive).collect(),
+                })
+            }
+            infer::ReferenceOutlivesReferent(ty, span) => {
+                let pointer_valid = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sub,
+                    None,
+                    note_and_explain::PrefixKind::PointerValidFor,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                let data_valid = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sup,
+                    None,
+                    note_and_explain::PrefixKind::DataValidFor,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                self.dcx().create_err(RefLongerThanData {
+                    span,
+                    ty: self.resolve_vars_if_possible(ty),
+                    notes: pointer_valid.into_iter().chain(data_valid).collect(),
+                })
+            }
+            infer::CompareImplItemObligation { span, impl_item_def_id, trait_item_def_id } => {
+                let mut err = self.infcx.report_extra_impl_obligation(
+                    span,
+                    impl_item_def_id,
+                    trait_item_def_id,
+                    &format!("`{sup}: {sub}`"),
+                );
+                // We should only suggest rewriting the `where` clause if the predicate is within that `where` clause
+                if let Some(generics) = self.tcx.hir().get_generics(impl_item_def_id)
+                    && generics.where_clause_span.contains(span)
+                {
+                    self.suggest_copy_trait_method_bounds(
+                        trait_item_def_id,
+                        impl_item_def_id,
+                        &mut err,
+                    );
+                }
+                err
+            }
+            infer::CheckAssociatedTypeBounds { impl_item_def_id, trait_item_def_id, parent } => {
+                let mut err = self.report_concrete_failure(generic_param_scope, *parent, sub, sup);
+
+                // Don't mention the item name if it's an RPITIT, since that'll just confuse
+                // folks.
+                if !self.tcx.is_impl_trait_in_trait(impl_item_def_id.to_def_id()) {
+                    let trait_item_span = self.tcx.def_span(trait_item_def_id);
+                    let item_name = self.tcx.item_name(impl_item_def_id.to_def_id());
+                    err.span_label(
+                        trait_item_span,
+                        format!("definition of `{item_name}` from trait"),
+                    );
+                }
+
+                self.suggest_copy_trait_method_bounds(
+                    trait_item_def_id,
+                    impl_item_def_id,
+                    &mut err,
+                );
+                err
+            }
+            infer::AscribeUserTypeProvePredicate(span) => {
+                let instantiated = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sup,
+                    None,
+                    note_and_explain::PrefixKind::LfInstantiatedWith,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                let must_outlive = note_and_explain::RegionExplanation::new(
+                    self.tcx,
+                    generic_param_scope,
+                    sub,
+                    None,
+                    note_and_explain::PrefixKind::LfMustOutlive,
+                    note_and_explain::SuffixKind::Empty,
+                );
+                self.dcx().create_err(LfBoundNotSatisfied {
+                    span,
+                    notes: instantiated.into_iter().chain(must_outlive).collect(),
+                })
+            }
+        };
+        if sub.is_error() || sup.is_error() {
+            err.downgrade_to_delayed_bug();
+        }
+        err
+    }
+
+    pub fn suggest_copy_trait_method_bounds(
+        &self,
+        trait_item_def_id: DefId,
+        impl_item_def_id: LocalDefId,
+        err: &mut Diag<'_>,
+    ) {
+        // FIXME(compiler-errors): Right now this is only being used for region
+        // predicate mismatches. Ideally, we'd use it for *all* predicate mismatches,
+        // but right now it's not really very smart when it comes to implicit `Sized`
+        // predicates and bounds on the trait itself.
+
+        let Some(impl_def_id) = self.tcx.associated_item(impl_item_def_id).impl_container(self.tcx)
+        else {
+            return;
+        };
+        let Some(trait_ref) = self.tcx.impl_trait_ref(impl_def_id) else {
+            return;
+        };
+        let trait_args = trait_ref
+            .instantiate_identity()
+            // Replace the explicit self type with `Self` for better suggestion rendering
+            .with_self_ty(self.tcx, Ty::new_param(self.tcx, 0, kw::SelfUpper))
+            .args;
+        let trait_item_args = ty::GenericArgs::identity_for_item(self.tcx, impl_item_def_id)
+            .rebase_onto(self.tcx, impl_def_id, trait_args);
+
+        let Ok(trait_predicates) =
+            self.tcx
+                .explicit_predicates_of(trait_item_def_id)
+                .instantiate_own(self.tcx, trait_item_args)
+                .map(|(pred, _)| {
+                    if pred.is_suggestable(self.tcx, false) {
+                        Ok(pred.to_string())
+                    } else {
+                        Err(())
+                    }
+                })
+                .collect::<Result<Vec<_>, ()>>()
+        else {
+            return;
+        };
+
+        let Some(generics) = self.tcx.hir().get_generics(impl_item_def_id) else {
+            return;
+        };
+
+        let suggestion = if trait_predicates.is_empty() {
+            WhereClauseSuggestions::Remove { span: generics.where_clause_span }
+        } else {
+            let space = if generics.where_clause_span.is_empty() { " " } else { "" };
+            WhereClauseSuggestions::CopyPredicates {
+                span: generics.where_clause_span,
+                space,
+                trait_predicates: trait_predicates.join(", "),
+            }
+        };
+        err.subdiagnostic(suggestion);
+    }
+
+    pub(super) fn report_placeholder_failure(
+        &self,
+        generic_param_scope: LocalDefId,
+        placeholder_origin: SubregionOrigin<'tcx>,
+        sub: Region<'tcx>,
+        sup: Region<'tcx>,
+    ) -> Diag<'a> {
+        // I can't think how to do better than this right now. -nikomatsakis
+        debug!(?placeholder_origin, ?sub, ?sup, "report_placeholder_failure");
+        match placeholder_origin {
+            infer::Subtype(box ref trace)
+                if matches!(
+                    &trace.cause.code().peel_derives(),
+                    ObligationCauseCode::WhereClause(..)
+                        | ObligationCauseCode::WhereClauseInExpr(..)
+                ) =>
+            {
+                // Hack to get around the borrow checker because trace.cause has an `Rc`.
+                if let ObligationCauseCode::WhereClause(_, span)
+                | ObligationCauseCode::WhereClauseInExpr(_, span, ..) =
+                    &trace.cause.code().peel_derives()
+                    && !span.is_dummy()
+                {
+                    let span = *span;
+                    self.report_concrete_failure(generic_param_scope, placeholder_origin, sub, sup)
+                        .with_span_note(span, "the lifetime requirement is introduced here")
+                } else {
+                    unreachable!(
+                        "control flow ensures we have a `BindingObligation` or `WhereClauseInExpr` here..."
+                    )
+                }
+            }
+            infer::Subtype(box trace) => {
+                let terr = TypeError::RegionsPlaceholderMismatch;
+                return self.report_and_explain_type_error(trace, terr);
+            }
+            _ => {
+                return self.report_concrete_failure(
+                    generic_param_scope,
+                    placeholder_origin,
+                    sub,
+                    sup,
+                );
+            }
+        }
+    }
+
+    pub fn report_generic_bound_failure(
+        &self,
+        generic_param_scope: LocalDefId,
+        span: Span,
+        origin: Option<SubregionOrigin<'tcx>>,
+        bound_kind: GenericKind<'tcx>,
+        sub: Region<'tcx>,
+    ) -> ErrorGuaranteed {
+        self.construct_generic_bound_failure(generic_param_scope, span, origin, bound_kind, sub)
+            .emit()
+    }
+
+    pub fn construct_generic_bound_failure(
+        &self,
+        generic_param_scope: LocalDefId,
+        span: Span,
+        origin: Option<SubregionOrigin<'tcx>>,
+        bound_kind: GenericKind<'tcx>,
+        sub: Region<'tcx>,
+    ) -> Diag<'a> {
+        if let Some(SubregionOrigin::CompareImplItemObligation {
+            span,
+            impl_item_def_id,
+            trait_item_def_id,
+        }) = origin
+        {
+            return self.infcx.report_extra_impl_obligation(
+                span,
+                impl_item_def_id,
+                trait_item_def_id,
+                &format!("`{bound_kind}: {sub}`"),
+            );
+        }
+
+        let labeled_user_string = match bound_kind {
+            GenericKind::Param(ref p) => format!("the parameter type `{p}`"),
+            GenericKind::Placeholder(ref p) => format!("the placeholder type `{p:?}`"),
+            GenericKind::Alias(ref p) => match p.kind(self.tcx) {
+                ty::Projection | ty::Inherent => {
+                    format!("the associated type `{p}`")
+                }
+                ty::Weak => format!("the type alias `{p}`"),
+                ty::Opaque => format!("the opaque type `{p}`"),
+            },
+        };
+
+        let mut err = self
+            .tcx
+            .dcx()
+            .struct_span_err(span, format!("{labeled_user_string} may not live long enough"));
+        err.code(match sub.kind() {
+            ty::ReEarlyParam(_) | ty::ReLateParam(_) if sub.has_name() => E0309,
+            ty::ReStatic => E0310,
+            _ => E0311,
+        });
+
+        '_explain: {
+            let (description, span) = match sub.kind() {
+                ty::ReEarlyParam(_) | ty::ReLateParam(_) | ty::ReStatic => {
+                    msg_span_from_named_region(self.tcx, generic_param_scope, sub, Some(span))
+                }
+                _ => (format!("lifetime `{sub}`"), Some(span)),
+            };
+            let prefix = format!("{labeled_user_string} must be valid for ");
+            label_msg_span(&mut err, &prefix, description, span, "...");
+            if let Some(origin) = origin {
+                self.note_region_origin(&mut err, &origin);
+            }
+        }
+
+        'suggestion: {
+            let msg = "consider adding an explicit lifetime bound";
+
+            if (bound_kind, sub).has_infer_regions()
+                || (bound_kind, sub).has_placeholders()
+                || !bound_kind.is_suggestable(self.tcx, false)
+            {
+                let lt_name = sub.get_name_or_anon().to_string();
+                err.help(format!("{msg} `{bound_kind}: {lt_name}`..."));
+                break 'suggestion;
+            }
+
+            let mut generic_param_scope = generic_param_scope;
+            while self.tcx.def_kind(generic_param_scope) == DefKind::OpaqueTy {
+                generic_param_scope = self.tcx.local_parent(generic_param_scope);
+            }
+
+            // type_param_sugg_span is (span, has_bounds, needs_parentheses)
+            let (type_scope, type_param_sugg_span) = match bound_kind {
+                GenericKind::Param(param) => {
+                    let generics = self.tcx.generics_of(generic_param_scope);
+                    let type_param = generics.type_param(param, self.tcx);
+                    let def_id = type_param.def_id.expect_local();
+                    let scope = self.tcx.local_def_id_to_hir_id(def_id).owner.def_id;
+                    // Get the `hir::Param` to verify whether it already has any bounds.
+                    // We do this to avoid suggesting code that ends up as `T: 'a'b`,
+                    // instead we suggest `T: 'a + 'b` in that case.
+                    let hir_generics = self.tcx.hir().get_generics(scope).unwrap();
+                    let sugg_span = match hir_generics.bounds_span_for_suggestions(def_id) {
+                        Some((span, open_paren_sp)) => Some((span, true, open_paren_sp)),
+                        // If `param` corresponds to `Self`, no usable suggestion span.
+                        None if generics.has_self && param.index == 0 => None,
+                        None => {
+                            let span = if let Some(param) =
+                                hir_generics.params.iter().find(|param| param.def_id == def_id)
+                                && let ParamName::Plain(ident) = param.name
+                            {
+                                ident.span.shrink_to_hi()
+                            } else {
+                                let span = self.tcx.def_span(def_id);
+                                span.shrink_to_hi()
+                            };
+                            Some((span, false, None))
+                        }
+                    };
+                    (scope, sugg_span)
+                }
+                _ => (generic_param_scope, None),
+            };
+            let suggestion_scope = {
+                let lifetime_scope = match sub.kind() {
+                    ty::ReStatic => hir::def_id::CRATE_DEF_ID,
+                    _ => match self.tcx.is_suitable_region(generic_param_scope, sub) {
+                        Some(info) => info.def_id,
+                        None => generic_param_scope,
+                    },
+                };
+                match self.tcx.is_descendant_of(type_scope.into(), lifetime_scope.into()) {
+                    true => type_scope,
+                    false => lifetime_scope,
+                }
+            };
+
+            let mut suggs = vec![];
+            let lt_name = self.suggest_name_region(generic_param_scope, sub, &mut suggs);
+
+            if let Some((sp, has_lifetimes, open_paren_sp)) = type_param_sugg_span
+                && suggestion_scope == type_scope
+            {
+                let suggestion =
+                    if has_lifetimes { format!(" + {lt_name}") } else { format!(": {lt_name}") };
+
+                if let Some(open_paren_sp) = open_paren_sp {
+                    suggs.push((open_paren_sp, "(".to_string()));
+                    suggs.push((sp, format!("){suggestion}")));
+                } else {
+                    suggs.push((sp, suggestion))
+                }
+            } else if let GenericKind::Alias(ref p) = bound_kind
+                && let ty::Projection = p.kind(self.tcx)
+                && let DefKind::AssocTy = self.tcx.def_kind(p.def_id)
+                && let Some(ty::ImplTraitInTraitData::Trait { .. }) =
+                    self.tcx.opt_rpitit_info(p.def_id)
+            {
+                // The lifetime found in the `impl` is longer than the one on the RPITIT.
+                // Do not suggest `<Type as Trait>::{opaque}: 'static`.
+            } else if let Some(generics) = self.tcx.hir().get_generics(suggestion_scope) {
+                let pred = format!("{bound_kind}: {lt_name}");
+                let suggestion = format!("{} {}", generics.add_where_or_trailing_comma(), pred);
+                suggs.push((generics.tail_span_for_predicate_suggestion(), suggestion))
+            } else {
+                let consider = format!("{msg} `{bound_kind}: {sub}`...");
+                err.help(consider);
+            }
+
+            if !suggs.is_empty() {
+                err.multipart_suggestion_verbose(
+                    msg,
+                    suggs,
+                    Applicability::MaybeIncorrect, // Issue #41966
+                );
+            }
+        }
+
+        err
+    }
+
+    pub fn suggest_name_region(
+        &self,
+        generic_param_scope: LocalDefId,
+        lifetime: Region<'tcx>,
+        add_lt_suggs: &mut Vec<(Span, String)>,
+    ) -> String {
+        struct LifetimeReplaceVisitor<'tcx, 'a> {
+            tcx: TyCtxt<'tcx>,
+            needle: hir::LifetimeName,
+            new_lt: &'a str,
+            add_lt_suggs: &'a mut Vec<(Span, String)>,
+        }
+
+        impl<'hir, 'tcx> hir::intravisit::Visitor<'hir> for LifetimeReplaceVisitor<'tcx, '_> {
+            fn visit_lifetime(&mut self, lt: &'hir hir::Lifetime) {
+                if lt.res == self.needle {
+                    let (pos, span) = lt.suggestion_position();
+                    let new_lt = &self.new_lt;
+                    let sugg = match pos {
+                        hir::LifetimeSuggestionPosition::Normal => format!("{new_lt}"),
+                        hir::LifetimeSuggestionPosition::Ampersand => format!("{new_lt} "),
+                        hir::LifetimeSuggestionPosition::ElidedPath => format!("<{new_lt}>"),
+                        hir::LifetimeSuggestionPosition::ElidedPathArgument => {
+                            format!("{new_lt}, ")
+                        }
+                        hir::LifetimeSuggestionPosition::ObjectDefault => format!("+ {new_lt}"),
+                    };
+                    self.add_lt_suggs.push((span, sugg));
+                }
+            }
+
+            fn visit_ty(&mut self, ty: &'hir hir::Ty<'hir>) {
+                let hir::TyKind::OpaqueDef(item_id, _, _) = ty.kind else {
+                    return hir::intravisit::walk_ty(self, ty);
+                };
+                let opaque_ty = self.tcx.hir().item(item_id).expect_opaque_ty();
+                if let Some(&(_, b)) =
+                    opaque_ty.lifetime_mapping.iter().find(|&(a, _)| a.res == self.needle)
+                {
+                    let prev_needle =
+                        std::mem::replace(&mut self.needle, hir::LifetimeName::Param(b));
+                    for bound in opaque_ty.bounds {
+                        self.visit_param_bound(bound);
+                    }
+                    self.needle = prev_needle;
+                }
+            }
+        }
+
+        let (lifetime_def_id, lifetime_scope) =
+            match self.tcx.is_suitable_region(generic_param_scope, lifetime) {
+                Some(info) if !lifetime.has_name() => {
+                    (info.bound_region.get_id().unwrap().expect_local(), info.def_id)
+                }
+                _ => return lifetime.get_name_or_anon().to_string(),
+            };
+
+        let new_lt = {
+            let generics = self.tcx.generics_of(lifetime_scope);
+            let mut used_names =
+                iter::successors(Some(generics), |g| g.parent.map(|p| self.tcx.generics_of(p)))
+                    .flat_map(|g| &g.own_params)
+                    .filter(|p| matches!(p.kind, ty::GenericParamDefKind::Lifetime))
+                    .map(|p| p.name)
+                    .collect::<Vec<_>>();
+            let hir_id = self.tcx.local_def_id_to_hir_id(lifetime_scope);
+            // consider late-bound lifetimes ...
+            used_names.extend(self.tcx.late_bound_vars(hir_id).into_iter().filter_map(
+                |p| match p {
+                    ty::BoundVariableKind::Region(lt) => lt.get_name(),
+                    _ => None,
+                },
+            ));
+            (b'a'..=b'z')
+                .map(|c| format!("'{}", c as char))
+                .find(|candidate| !used_names.iter().any(|e| e.as_str() == candidate))
+                .unwrap_or("'lt".to_string())
+        };
+
+        let mut visitor = LifetimeReplaceVisitor {
+            tcx: self.tcx,
+            needle: hir::LifetimeName::Param(lifetime_def_id),
+            add_lt_suggs,
+            new_lt: &new_lt,
+        };
+        match self.tcx.expect_hir_owner_node(lifetime_scope) {
+            hir::OwnerNode::Item(i) => visitor.visit_item(i),
+            hir::OwnerNode::ForeignItem(i) => visitor.visit_foreign_item(i),
+            hir::OwnerNode::ImplItem(i) => visitor.visit_impl_item(i),
+            hir::OwnerNode::TraitItem(i) => visitor.visit_trait_item(i),
+            hir::OwnerNode::Crate(_) => bug!("OwnerNode::Crate doesn't not have generics"),
+            hir::OwnerNode::Synthetic => unreachable!(),
+        }
+
+        let ast_generics = self.tcx.hir().get_generics(lifetime_scope).unwrap();
+        let sugg = ast_generics
+            .span_for_lifetime_suggestion()
+            .map(|span| (span, format!("{new_lt}, ")))
+            .unwrap_or_else(|| (ast_generics.span, format!("<{new_lt}>")));
+        add_lt_suggs.push(sugg);
+
+        new_lt
+    }
+
+    fn report_sub_sup_conflict(
+        &self,
+        generic_param_scope: LocalDefId,
+        var_origin: RegionVariableOrigin,
+        sub_origin: SubregionOrigin<'tcx>,
+        sub_region: Region<'tcx>,
+        sup_origin: SubregionOrigin<'tcx>,
+        sup_region: Region<'tcx>,
+    ) -> ErrorGuaranteed {
+        let mut err = self.report_inference_failure(var_origin);
+
+        note_and_explain_region(
+            self.tcx,
+            &mut err,
+            generic_param_scope,
+            "first, the lifetime cannot outlive ",
+            sup_region,
+            "...",
+            None,
+        );
+
+        debug!("report_sub_sup_conflict: var_origin={:?}", var_origin);
+        debug!("report_sub_sup_conflict: sub_region={:?}", sub_region);
+        debug!("report_sub_sup_conflict: sub_origin={:?}", sub_origin);
+        debug!("report_sub_sup_conflict: sup_region={:?}", sup_region);
+        debug!("report_sub_sup_conflict: sup_origin={:?}", sup_origin);
+
+        if let infer::Subtype(ref sup_trace) = sup_origin
+            && let infer::Subtype(ref sub_trace) = sub_origin
+            && let Some((sup_expected, sup_found, _)) = self.values_str(sup_trace.values)
+            && let Some((sub_expected, sub_found, _)) = self.values_str(sub_trace.values)
+            && sub_expected == sup_expected
+            && sub_found == sup_found
+        {
+            note_and_explain_region(
+                self.tcx,
+                &mut err,
+                generic_param_scope,
+                "...but the lifetime must also be valid for ",
+                sub_region,
+                "...",
+                None,
+            );
+            err.span_note(
+                sup_trace.cause.span,
+                format!("...so that the {}", sup_trace.cause.as_requirement_str()),
+            );
+
+            err.note_expected_found(&"", sup_expected, &"", sup_found);
+            return if sub_region.is_error() | sup_region.is_error() {
+                err.delay_as_bug()
+            } else {
+                err.emit()
+            };
+        }
+
+        self.note_region_origin(&mut err, &sup_origin);
+
+        note_and_explain_region(
+            self.tcx,
+            &mut err,
+            generic_param_scope,
+            "but, the lifetime must be valid for ",
+            sub_region,
+            "...",
+            None,
+        );
+
+        self.note_region_origin(&mut err, &sub_origin);
+        if sub_region.is_error() | sup_region.is_error() { err.delay_as_bug() } else { err.emit() }
+    }
+
+    fn report_inference_failure(&self, var_origin: RegionVariableOrigin) -> Diag<'_> {
+        let br_string = |br: ty::BoundRegionKind| {
+            let mut s = match br {
+                ty::BrNamed(_, name) => name.to_string(),
+                _ => String::new(),
+            };
+            if !s.is_empty() {
+                s.push(' ');
+            }
+            s
+        };
+        let var_description = match var_origin {
+            infer::MiscVariable(_) => String::new(),
+            infer::PatternRegion(_) => " for pattern".to_string(),
+            infer::AddrOfRegion(_) => " for borrow expression".to_string(),
+            infer::Autoref(_) => " for autoref".to_string(),
+            infer::Coercion(_) => " for automatic coercion".to_string(),
+            infer::BoundRegion(_, br, infer::FnCall) => {
+                format!(" for lifetime parameter {}in function call", br_string(br))
+            }
+            infer::BoundRegion(_, br, infer::HigherRankedType) => {
+                format!(" for lifetime parameter {}in generic type", br_string(br))
+            }
+            infer::BoundRegion(_, br, infer::AssocTypeProjection(def_id)) => format!(
+                " for lifetime parameter {}in trait containing associated type `{}`",
+                br_string(br),
+                self.tcx.associated_item(def_id).name
+            ),
+            infer::RegionParameterDefinition(_, name) => {
+                format!(" for lifetime parameter `{name}`")
+            }
+            infer::UpvarRegion(ref upvar_id, _) => {
+                let var_name = self.tcx.hir().name(upvar_id.var_path.hir_id);
+                format!(" for capture of `{var_name}` by closure")
+            }
+            infer::Nll(..) => bug!("NLL variable found in lexical phase"),
+        };
+
+        struct_span_code_err!(
+            self.dcx(),
+            var_origin.span(),
+            E0495,
+            "cannot infer an appropriate lifetime{} due to conflicting requirements",
+            var_description
+        )
+    }
+}
+
+pub(super) fn note_and_explain_region<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    err: &mut Diag<'_>,
+    generic_param_scope: LocalDefId,
+    prefix: &str,
+    region: ty::Region<'tcx>,
+    suffix: &str,
+    alt_span: Option<Span>,
+) {
+    let (description, span) = match *region {
+        ty::ReEarlyParam(_) | ty::ReLateParam(_) | ty::RePlaceholder(_) | ty::ReStatic => {
+            msg_span_from_named_region(tcx, generic_param_scope, region, alt_span)
+        }
+
+        ty::ReError(_) => return,
+
+        // FIXME(#125431): `ReVar` shouldn't reach here.
+        ty::ReVar(_) => (format!("lifetime `{region}`"), alt_span),
+
+        ty::ReBound(..) | ty::ReErased => {
+            bug!("unexpected region for note_and_explain_region: {:?}", region);
+        }
+    };
+
+    emit_msg_span(err, prefix, description, span, suffix);
+}
+
+fn explain_free_region<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    err: &mut Diag<'_>,
+    generic_param_scope: LocalDefId,
+    prefix: &str,
+    region: ty::Region<'tcx>,
+    suffix: &str,
+) {
+    let (description, span) = msg_span_from_named_region(tcx, generic_param_scope, region, None);
+
+    label_msg_span(err, prefix, description, span, suffix);
+}
+
+fn msg_span_from_named_region<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    generic_param_scope: LocalDefId,
+    region: ty::Region<'tcx>,
+    alt_span: Option<Span>,
+) -> (String, Option<Span>) {
+    match *region {
+        ty::ReEarlyParam(br) => {
+            let scope = tcx
+                .parent(tcx.generics_of(generic_param_scope).region_param(br, tcx).def_id)
+                .expect_local();
+            let span = if let Some(param) =
+                tcx.hir().get_generics(scope).and_then(|generics| generics.get_named(br.name))
+            {
+                param.span
+            } else {
+                tcx.def_span(scope)
+            };
+            let text = if br.has_name() {
+                format!("the lifetime `{}` as defined here", br.name)
+            } else {
+                "the anonymous lifetime as defined here".to_string()
+            };
+            (text, Some(span))
+        }
+        ty::ReLateParam(ref fr) => {
+            if !fr.bound_region.is_named()
+                && let Some((ty, _)) =
+                    find_anon_type(tcx, generic_param_scope, region, &fr.bound_region)
+            {
+                ("the anonymous lifetime defined here".to_string(), Some(ty.span))
+            } else {
+                match fr.bound_region {
+                    ty::BoundRegionKind::BrNamed(_, name) => {
+                        let span = if let Some(param) = tcx
+                            .hir()
+                            .get_generics(generic_param_scope)
+                            .and_then(|generics| generics.get_named(name))
+                        {
+                            param.span
+                        } else {
+                            tcx.def_span(generic_param_scope)
+                        };
+                        let text = if name == kw::UnderscoreLifetime {
+                            "the anonymous lifetime as defined here".to_string()
+                        } else {
+                            format!("the lifetime `{name}` as defined here")
+                        };
+                        (text, Some(span))
+                    }
+                    ty::BrAnon => (
+                        "the anonymous lifetime as defined here".to_string(),
+                        Some(tcx.def_span(generic_param_scope)),
+                    ),
+                    _ => (
+                        format!("the lifetime `{region}` as defined here"),
+                        Some(tcx.def_span(generic_param_scope)),
+                    ),
+                }
+            }
+        }
+        ty::ReStatic => ("the static lifetime".to_owned(), alt_span),
+        ty::RePlaceholder(ty::PlaceholderRegion {
+            bound: ty::BoundRegion { kind: ty::BoundRegionKind::BrNamed(def_id, name), .. },
+            ..
+        }) => (format!("the lifetime `{name}` as defined here"), Some(tcx.def_span(def_id))),
+        ty::RePlaceholder(ty::PlaceholderRegion {
+            bound: ty::BoundRegion { kind: ty::BoundRegionKind::BrAnon, .. },
+            ..
+        }) => ("an anonymous lifetime".to_owned(), None),
+        _ => bug!("{:?}", region),
+    }
+}
+
+fn emit_msg_span(
+    err: &mut Diag<'_>,
+    prefix: &str,
+    description: String,
+    span: Option<Span>,
+    suffix: &str,
+) {
+    let message = format!("{prefix}{description}{suffix}");
+
+    if let Some(span) = span {
+        err.span_note(span, message);
+    } else {
+        err.note(message);
+    }
+}
+
+fn label_msg_span(
+    err: &mut Diag<'_>,
+    prefix: &str,
+    description: String,
+    span: Option<Span>,
+    suffix: &str,
+) {
+    let message = format!("{prefix}{description}{suffix}");
+
+    if let Some(span) = span {
+        err.span_label(span, message);
+    } else {
+        err.note(message);
+    }
+}
+
+#[instrument(level = "trace", skip(infcx))]
+pub fn unexpected_hidden_region_diagnostic<'a, 'tcx>(
+    infcx: &'a InferCtxt<'tcx>,
+    generic_param_scope: LocalDefId,
+    span: Span,
+    hidden_ty: Ty<'tcx>,
+    hidden_region: ty::Region<'tcx>,
+    opaque_ty_key: ty::OpaqueTypeKey<'tcx>,
+) -> Diag<'a> {
+    let tcx = infcx.tcx;
+    let mut err = infcx.dcx().create_err(errors::OpaqueCapturesLifetime {
+        span,
+        opaque_ty: Ty::new_opaque(tcx, opaque_ty_key.def_id.to_def_id(), opaque_ty_key.args),
+        opaque_ty_span: tcx.def_span(opaque_ty_key.def_id),
+    });
+
+    // Explain the region we are capturing.
+    match *hidden_region {
+        ty::ReEarlyParam(_) | ty::ReLateParam(_) | ty::ReStatic => {
+            // Assuming regionck succeeded (*), we ought to always be
+            // capturing *some* region from the fn header, and hence it
+            // ought to be free. So under normal circumstances, we will go
+            // down this path which gives a decent human readable
+            // explanation.
+            //
+            // (*) if not, the `tainted_by_errors` field would be set to
+            // `Some(ErrorGuaranteed)` in any case, so we wouldn't be here at all.
+            explain_free_region(
+                tcx,
+                &mut err,
+                generic_param_scope,
+                &format!("hidden type `{hidden_ty}` captures "),
+                hidden_region,
+                "",
+            );
+            if let Some(reg_info) = tcx.is_suitable_region(generic_param_scope, hidden_region) {
+                let fn_returns = tcx.return_type_impl_or_dyn_traits(reg_info.def_id);
+                nice_region_error::suggest_new_region_bound(
+                    tcx,
+                    &mut err,
+                    fn_returns,
+                    hidden_region.to_string(),
+                    None,
+                    format!("captures `{hidden_region}`"),
+                    None,
+                    Some(reg_info.def_id),
+                )
+            }
+        }
+        ty::RePlaceholder(_) => {
+            explain_free_region(
+                tcx,
+                &mut err,
+                generic_param_scope,
+                &format!("hidden type `{}` captures ", hidden_ty),
+                hidden_region,
+                "",
+            );
+        }
+        ty::ReError(_) => {
+            err.downgrade_to_delayed_bug();
+        }
+        _ => {
+            // Ugh. This is a painful case: the hidden region is not one
+            // that we can easily summarize or explain. This can happen
+            // in a case like
+            // `tests/ui/multiple-lifetimes/ordinary-bounds-unsuited.rs`:
+            //
+            // ```
+            // fn upper_bounds<'a, 'b>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'a, 'b> {
+            //   if condition() { a } else { b }
+            // }
+            // ```
+            //
+            // Here the captured lifetime is the intersection of `'a` and
+            // `'b`, which we can't quite express.
+
+            // We can at least report a really cryptic error for now.
+            note_and_explain_region(
+                tcx,
+                &mut err,
+                generic_param_scope,
+                &format!("hidden type `{hidden_ty}` captures "),
+                hidden_region,
+                "",
+                None,
+            );
+        }
+    }
+
+    err
+}
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index 9f55939c165e0..a0be545d46fed 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -1264,6 +1264,9 @@ impl<'tcx> InferCtxt<'tcx> {
     where
         T: TypeFoldable<TyCtxt<'tcx>>,
     {
+        if let Err(guar) = value.error_reported() {
+            self.set_tainted_by_errors(guar);
+        }
         if !value.has_non_region_infer() {
             return value;
         }
diff --git a/compiler/rustc_lint/messages.ftl b/compiler/rustc_lint/messages.ftl
index 3e952558d29d3..4f2d59b4c6632 100644
--- a/compiler/rustc_lint/messages.ftl
+++ b/compiler/rustc_lint/messages.ftl
@@ -185,6 +185,10 @@ lint_cfg_attr_no_attributes =
 
 lint_check_name_unknown_tool = unknown lint tool: `{$tool_name}`
 
+lint_closure_returning_async_block = closure returning async block can be made into an async closure
+    .label = this async block can be removed, and the closure can be turned into an async closure
+    .suggestion = turn this into an async closure
+
 lint_command_line_source = `forbid` lint level was set on command line
 
 lint_confusable_identifier_pair = found both `{$existing_sym}` and `{$sym}` as identifiers, which look alike
@@ -439,6 +443,9 @@ lint_lintpass_by_hand = implementing `LintPass` by hand
 lint_macro_expanded_macro_exports_accessed_by_absolute_paths = macro-expanded `macro_export` macros from the current crate cannot be referred to by absolute paths
     .note = the macro is defined here
 
+lint_macro_expr_fragment_specifier_2024_migration =
+    the `expr` fragment specifier will accept more expressions in the 2024 edition
+    .suggestion = to keep the existing behavior, use the `expr_2021` fragment specifier
 lint_macro_is_private = macro `{$ident}` is private
 
 lint_macro_rule_never_used = rule #{$n} of macro `{$name}` is never used
diff --git a/compiler/rustc_lint/src/async_closures.rs b/compiler/rustc_lint/src/async_closures.rs
new file mode 100644
index 0000000000000..33cc5738262f6
--- /dev/null
+++ b/compiler/rustc_lint/src/async_closures.rs
@@ -0,0 +1,129 @@
+use rustc_hir as hir;
+use rustc_macros::{LintDiagnostic, Subdiagnostic};
+use rustc_session::{declare_lint, declare_lint_pass};
+use rustc_span::Span;
+
+use crate::{LateContext, LateLintPass};
+
+declare_lint! {
+    /// The `closure_returning_async_block` lint detects cases where users
+    /// write a closure that returns an async block.
+    ///
+    /// ### Example
+    ///
+    /// ```rust
+    /// #![warn(closure_returning_async_block)]
+    /// let c = |x: &str| async {};
+    /// ```
+    ///
+    /// {{produces}}
+    ///
+    /// ### Explanation
+    ///
+    /// Using an async closure is preferable over a closure that returns an
+    /// async block, since async closures are less restrictive in how its
+    /// captures are allowed to be used.
+    ///
+    /// For example, this code does not work with a closure returning an async
+    /// block:
+    ///
+    /// ```rust,compile_fail
+    /// async fn callback(x: &str) {}
+    ///
+    /// let captured_str = String::new();
+    /// let c = move || async {
+    ///     callback(&captured_str).await;
+    /// };
+    /// ```
+    ///
+    /// But it does work with async closures:
+    ///
+    /// ```rust
+    /// #![feature(async_closure)]
+    ///
+    /// async fn callback(x: &str) {}
+    ///
+    /// let captured_str = String::new();
+    /// let c = async move || {
+    ///     callback(&captured_str).await;
+    /// };
+    /// ```
+    pub CLOSURE_RETURNING_ASYNC_BLOCK,
+    Allow,
+    "closure that returns `async {}` could be rewritten as an async closure",
+    @feature_gate = async_closure;
+}
+
+declare_lint_pass!(
+    /// Lint for potential usages of async closures and async fn trait bounds.
+    AsyncClosureUsage => [CLOSURE_RETURNING_ASYNC_BLOCK]
+);
+
+impl<'tcx> LateLintPass<'tcx> for AsyncClosureUsage {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
+        let hir::ExprKind::Closure(&hir::Closure {
+            body,
+            kind: hir::ClosureKind::Closure,
+            fn_decl_span,
+            ..
+        }) = expr.kind
+        else {
+            return;
+        };
+
+        let mut body = cx.tcx.hir().body(body).value;
+
+        // Only peel blocks that have no expressions.
+        while let hir::ExprKind::Block(&hir::Block { stmts: [], expr: Some(tail), .. }, None) =
+            body.kind
+        {
+            body = tail;
+        }
+
+        let hir::ExprKind::Closure(&hir::Closure {
+            kind:
+                hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                    hir::CoroutineDesugaring::Async,
+                    hir::CoroutineSource::Block,
+                )),
+            fn_decl_span: async_decl_span,
+            ..
+        }) = body.kind
+        else {
+            return;
+        };
+
+        let deletion_span = cx.tcx.sess.source_map().span_extend_while_whitespace(async_decl_span);
+
+        cx.tcx.emit_node_span_lint(
+            CLOSURE_RETURNING_ASYNC_BLOCK,
+            expr.hir_id,
+            fn_decl_span,
+            ClosureReturningAsyncBlock {
+                async_decl_span,
+                sugg: AsyncClosureSugg {
+                    deletion_span,
+                    insertion_span: fn_decl_span.shrink_to_lo(),
+                },
+            },
+        );
+    }
+}
+
+#[derive(LintDiagnostic)]
+#[diag(lint_closure_returning_async_block)]
+struct ClosureReturningAsyncBlock {
+    #[label]
+    async_decl_span: Span,
+    #[subdiagnostic]
+    sugg: AsyncClosureSugg,
+}
+
+#[derive(Subdiagnostic)]
+#[multipart_suggestion(lint_suggestion, applicability = "maybe-incorrect")]
+struct AsyncClosureSugg {
+    #[suggestion_part(code = "")]
+    deletion_span: Span,
+    #[suggestion_part(code = "async ")]
+    insertion_span: Span,
+}
diff --git a/compiler/rustc_lint/src/async_fn_in_trait.rs b/compiler/rustc_lint/src/async_fn_in_trait.rs
index 40778542c75c9..6daee95dda6a2 100644
--- a/compiler/rustc_lint/src/async_fn_in_trait.rs
+++ b/compiler/rustc_lint/src/async_fn_in_trait.rs
@@ -3,7 +3,7 @@ use crate::LateContext;
 use crate::LateLintPass;
 use rustc_hir as hir;
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_trait_selection::traits::error_reporting::suggestions::suggest_desugaring_async_fn_to_impl_future_in_trait;
+use rustc_trait_selection::error_reporting::traits::suggestions::suggest_desugaring_async_fn_to_impl_future_in_trait;
 
 declare_lint! {
     /// The `async_fn_in_trait` lint detects use of `async fn` in the
diff --git a/compiler/rustc_lint/src/impl_trait_overcaptures.rs b/compiler/rustc_lint/src/impl_trait_overcaptures.rs
index d4f6d388d9fe3..0860413190c3d 100644
--- a/compiler/rustc_lint/src/impl_trait_overcaptures.rs
+++ b/compiler/rustc_lint/src/impl_trait_overcaptures.rs
@@ -11,7 +11,7 @@ use rustc_middle::ty::{
     self, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor,
 };
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::{sym, Span};
+use rustc_span::Span;
 
 use crate::fluent_generated as fluent;
 use crate::{LateContext, LateLintPass};
@@ -57,7 +57,7 @@ declare_lint! {
     pub IMPL_TRAIT_OVERCAPTURES,
     Allow,
     "`impl Trait` will capture more lifetimes than possibly intended in edition 2024",
-    @feature_gate = sym::precise_capturing;
+    @feature_gate = precise_capturing;
     //@future_incompatible = FutureIncompatibleInfo {
     //    reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2024),
     //    reference: "<FIXME>",
@@ -91,7 +91,7 @@ declare_lint! {
     pub IMPL_TRAIT_REDUNDANT_CAPTURES,
     Warn,
     "redundant precise-capturing `use<...>` syntax on an `impl Trait`",
-    @feature_gate = sym::precise_capturing;
+    @feature_gate = precise_capturing;
 }
 
 declare_lint_pass!(
diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs
index 17f9d4421aef2..b6927cf60b69e 100644
--- a/compiler/rustc_lint/src/lib.rs
+++ b/compiler/rustc_lint/src/lib.rs
@@ -41,6 +41,7 @@
 #![feature(trait_upcasting)]
 // tidy-alphabetical-end
 
+mod async_closures;
 mod async_fn_in_trait;
 pub mod builtin;
 mod context;
@@ -60,6 +61,7 @@ mod late;
 mod let_underscore;
 mod levels;
 mod lints;
+mod macro_expr_fragment_specifier_2024_migration;
 mod map_unit_fn;
 mod methods;
 mod multiple_supertrait_upcastable;
@@ -86,6 +88,7 @@ use rustc_hir::def_id::LocalModDefId;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::TyCtxt;
 
+use async_closures::AsyncClosureUsage;
 use async_fn_in_trait::AsyncFnInTrait;
 use builtin::*;
 use deref_into_dyn_supertrait::*;
@@ -97,6 +100,7 @@ use impl_trait_overcaptures::ImplTraitOvercaptures;
 use internal::*;
 use invalid_from_utf8::*;
 use let_underscore::*;
+use macro_expr_fragment_specifier_2024_migration::*;
 use map_unit_fn::*;
 use methods::*;
 use multiple_supertrait_upcastable::*;
@@ -170,6 +174,7 @@ early_lint_methods!(
             IncompleteInternalFeatures: IncompleteInternalFeatures,
             RedundantSemicolons: RedundantSemicolons,
             UnusedDocComment: UnusedDocComment,
+            Expr2024: Expr2024,
         ]
     ]
 );
@@ -226,6 +231,7 @@ late_lint_methods!(
             MapUnitFn: MapUnitFn,
             MissingDebugImplementations: MissingDebugImplementations,
             MissingDoc: MissingDoc,
+            AsyncClosureUsage: AsyncClosureUsage,
             AsyncFnInTrait: AsyncFnInTrait,
             NonLocalDefinitions: NonLocalDefinitions::default(),
             ImplTraitOvercaptures: ImplTraitOvercaptures,
diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs
index 7c5640f5959a0..54c73710eca6f 100644
--- a/compiler/rustc_lint/src/lints.rs
+++ b/compiler/rustc_lint/src/lints.rs
@@ -317,6 +317,13 @@ pub struct BuiltinTypeAliasGenericBounds<'a, 'b> {
     pub sub: Option<SuggestChangingAssocTypes<'a, 'b>>,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(lint_macro_expr_fragment_specifier_2024_migration)]
+pub struct MacroExprFragment2024 {
+    #[suggestion(code = "expr_2021", applicability = "machine-applicable")]
+    pub suggestion: Span,
+}
+
 pub struct BuiltinTypeAliasGenericBoundsSuggestion {
     pub suggestions: Vec<(Span, String)>,
 }
diff --git a/compiler/rustc_lint/src/macro_expr_fragment_specifier_2024_migration.rs b/compiler/rustc_lint/src/macro_expr_fragment_specifier_2024_migration.rs
new file mode 100644
index 0000000000000..867e132b1063e
--- /dev/null
+++ b/compiler/rustc_lint/src/macro_expr_fragment_specifier_2024_migration.rs
@@ -0,0 +1,155 @@
+//! Migration code for the `expr_fragment_specifier_2024`
+//! rule.
+use tracing::debug;
+
+use rustc_ast::token::Token;
+use rustc_ast::token::TokenKind;
+use rustc_ast::tokenstream::TokenStream;
+use rustc_ast::tokenstream::TokenTree;
+use rustc_session::declare_lint;
+use rustc_session::declare_lint_pass;
+use rustc_session::lint::FutureIncompatibilityReason;
+use rustc_span::edition::Edition;
+use rustc_span::sym;
+
+use crate::lints::MacroExprFragment2024;
+use crate::EarlyLintPass;
+
+declare_lint! {
+    /// The `edition_2024_expr_fragment_specifier` lint detects the use of
+    /// `expr` fragments in macros during migration to the 2024 edition.
+    ///
+    /// The `expr` fragment specifier will accept more expressions in the 2024
+    /// edition. To maintain the behavior from the 2021 edition and earlier, use
+    /// the `expr_2021` fragment specifier.
+    ///
+    /// ### Example
+    ///
+    /// ```rust,edition2021,compile_fail
+    /// #![deny(edition_2024_expr_fragment_specifier)]
+    /// macro_rules! m {
+    ///   ($e:expr) => {
+    ///       $e
+    ///   }
+    /// }
+    ///
+    /// fn main() {
+    ///    m!(1);
+    /// }
+    /// ```
+    ///
+    /// {{produces}}
+    ///
+    /// ### Explanation
+    ///
+    /// Rust [editions] allow the language to evolve without breaking backwards
+    /// compatibility. This lint catches code that uses [macro matcher fragment
+    /// specifiers] that have changed meaning in the 2024 edition. If you switch
+    /// to the new edition without updating the code, your macros may behave
+    /// differently.
+    ///
+    /// In the 2024 edition, the `expr` fragment specifier `expr` will also
+    /// match `const { ... }` blocks. This means if a macro had a pattern that
+    /// matched `$e:expr` and another that matches `const { $e: expr }`, for
+    /// example, that under the 2024 edition the first pattern would match while
+    /// in the 2021 and earlier editions the second pattern would match. To keep
+    /// the old behavior, use the `expr_2021` fragment specifier.
+    ///
+    /// This lint detects macros whose behavior might change due to the changing
+    /// meaning of the `expr` fragment specifier. It is "allow" by default
+    /// because the code is perfectly valid in older editions. The [`cargo fix`]
+    /// tool with the `--edition` flag will switch this lint to "warn" and
+    /// automatically apply the suggested fix from the compiler. This provides a
+    /// completely automated way to update old code for a new edition.
+    ///
+    /// Using `cargo fix --edition` with this lint will ensure that your code
+    /// retains the same behavior. This may not be the desired, as macro authors
+    /// often will want their macros to use the latest grammar for matching
+    /// expressions. Be sure to carefully review changes introduced by this lint
+    /// to ensure the macros implement the desired behavior.
+    ///
+    /// [editions]: https://doc.rust-lang.org/edition-guide/
+    /// [macro matcher fragment specifiers]: https://doc.rust-lang.org/nightly/edition-guide/rust-2024/macro-fragment-specifiers.html
+    /// [`cargo fix`]: https://doc.rust-lang.org/cargo/commands/cargo-fix.html
+    pub EDITION_2024_EXPR_FRAGMENT_SPECIFIER,
+    Allow,
+    "The `expr` fragment specifier will accept more expressions in the 2024 edition. \
+    To keep the existing behavior, use the `expr_2021` fragment specifier.",
+    @future_incompatible = FutureIncompatibleInfo {
+        reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2024),
+        reference: "Migration Guide <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/macro-fragment-specifiers.html>",
+    };
+}
+
+declare_lint_pass!(Expr2024 => [EDITION_2024_EXPR_FRAGMENT_SPECIFIER,]);
+
+impl Expr2024 {
+    fn check_tokens(&mut self, cx: &crate::EarlyContext<'_>, tokens: &TokenStream) {
+        let mut prev_colon = false;
+        let mut prev_identifier = false;
+        let mut prev_dollar = false;
+        for tt in tokens.trees() {
+            debug!(
+                "check_tokens: {:?} - colon {prev_dollar} - ident {prev_identifier} - colon {prev_colon}",
+                tt
+            );
+            match tt {
+                TokenTree::Token(token, _) => match token.kind {
+                    TokenKind::Dollar => {
+                        prev_dollar = true;
+                        continue;
+                    }
+                    TokenKind::Ident(..) | TokenKind::NtIdent(..) => {
+                        if prev_colon && prev_identifier && prev_dollar {
+                            self.check_ident_token(cx, token);
+                        } else if prev_dollar {
+                            prev_identifier = true;
+                            continue;
+                        }
+                    }
+                    TokenKind::Colon => {
+                        if prev_dollar && prev_identifier {
+                            prev_colon = true;
+                            continue;
+                        }
+                    }
+                    _ => {}
+                },
+                TokenTree::Delimited(.., tts) => self.check_tokens(cx, tts),
+            }
+            prev_colon = false;
+            prev_identifier = false;
+            prev_dollar = false;
+        }
+    }
+
+    fn check_ident_token(&mut self, cx: &crate::EarlyContext<'_>, token: &Token) {
+        debug!("check_ident_token: {:?}", token);
+        let (sym, edition) = match token.kind {
+            TokenKind::Ident(sym, _) => (sym, Edition::Edition2024),
+            _ => return,
+        };
+
+        debug!("token.span.edition(): {:?}", token.span.edition());
+        if token.span.edition() >= edition {
+            return;
+        }
+
+        if sym != sym::expr {
+            return;
+        }
+
+        debug!("emitting lint");
+        cx.builder.emit_span_lint(
+            &EDITION_2024_EXPR_FRAGMENT_SPECIFIER,
+            token.span.into(),
+            MacroExprFragment2024 { suggestion: token.span },
+        );
+    }
+}
+
+impl EarlyLintPass for Expr2024 {
+    fn check_mac_def(&mut self, cx: &crate::EarlyContext<'_>, mc: &rustc_ast::MacroDef) {
+        self.check_tokens(cx, &mc.body.tokens);
+    }
+}
diff --git a/compiler/rustc_lint/src/multiple_supertrait_upcastable.rs b/compiler/rustc_lint/src/multiple_supertrait_upcastable.rs
index 445dcd41e5d52..93dd5e764c67d 100644
--- a/compiler/rustc_lint/src/multiple_supertrait_upcastable.rs
+++ b/compiler/rustc_lint/src/multiple_supertrait_upcastable.rs
@@ -2,7 +2,6 @@ use crate::{LateContext, LateLintPass, LintContext};
 
 use rustc_hir as hir;
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::sym;
 
 declare_lint! {
     /// The `multiple_supertrait_upcastable` lint detects when an object-safe trait has multiple
@@ -30,7 +29,7 @@ declare_lint! {
     pub MULTIPLE_SUPERTRAIT_UPCASTABLE,
     Allow,
     "detect when an object-safe trait has multiple supertraits",
-    @feature_gate = sym::multiple_supertrait_upcastable;
+    @feature_gate = multiple_supertrait_upcastable;
 }
 
 declare_lint_pass!(MultipleSupertraitUpcastable => [MULTIPLE_SUPERTRAIT_UPCASTABLE]);
diff --git a/compiler/rustc_lint/src/non_local_def.rs b/compiler/rustc_lint/src/non_local_def.rs
index 17429ed061f25..2f8eea6cd1816 100644
--- a/compiler/rustc_lint/src/non_local_def.rs
+++ b/compiler/rustc_lint/src/non_local_def.rs
@@ -11,10 +11,10 @@ use rustc_session::{declare_lint, impl_lint_pass};
 use rustc_span::def_id::{DefId, LOCAL_CRATE};
 use rustc_span::Span;
 use rustc_span::{sym, symbol::kw, ExpnKind, MacroKind, Symbol};
-use rustc_trait_selection::infer::TyCtxtInferExt;
-use rustc_trait_selection::traits::error_reporting::ambiguity::{
+use rustc_trait_selection::error_reporting::traits::ambiguity::{
     compute_applicable_impls_for_diagnostics, CandidateSource,
 };
+use rustc_trait_selection::infer::TyCtxtInferExt;
 
 use crate::fluent_generated as fluent;
 use crate::lints::{NonLocalDefinitionsCargoUpdateNote, NonLocalDefinitionsDiag};
diff --git a/compiler/rustc_lint/src/types.rs b/compiler/rustc_lint/src/types.rs
index f3a904022e9ed..c0364b3571642 100644
--- a/compiler/rustc_lint/src/types.rs
+++ b/compiler/rustc_lint/src/types.rs
@@ -563,7 +563,8 @@ fn lint_literal<'tcx>(
         ty::Float(t) => {
             let is_infinite = match lit.node {
                 ast::LitKind::Float(v, _) => match t {
-                    // FIXME(f16_f128): add this check once we have library support
+                    // FIXME(f16_f128): add this check once `is_infinite` is reliable (ABI
+                    // issues resolved).
                     ty::FloatTy::F16 => Ok(false),
                     ty::FloatTy::F32 => v.as_str().parse().map(f32::is_infinite),
                     ty::FloatTy::F64 => v.as_str().parse().map(f64::is_infinite),
diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
index 048c2fb4e6767..aa7844f40121b 100644
--- a/compiler/rustc_lint_defs/src/builtin.rs
+++ b/compiler/rustc_lint_defs/src/builtin.rs
@@ -9,7 +9,6 @@
 
 use crate::{declare_lint, declare_lint_pass, FutureIncompatibilityReason};
 use rustc_span::edition::Edition;
-use rustc_span::symbol::sym;
 
 declare_lint_pass! {
     /// Does nothing as a lint pass, but registers some `Lint`s
@@ -80,6 +79,7 @@ declare_lint_pass! {
         PRIVATE_BOUNDS,
         PRIVATE_INTERFACES,
         PROC_MACRO_DERIVE_RESOLUTION_FALLBACK,
+        PTR_CAST_ADD_AUTO_TO_OBJECT,
         PUB_USE_OF_PRIVATE_EXTERN_CRATE,
         REDUNDANT_LIFETIMES,
         REFINING_IMPL_TRAIT_INTERNAL,
@@ -462,7 +462,7 @@ declare_lint! {
     pub MUST_NOT_SUSPEND,
     Allow,
     "use of a `#[must_not_suspend]` value across a yield point",
-    @feature_gate = rustc_span::symbol::sym::must_not_suspend;
+    @feature_gate = must_not_suspend;
 }
 
 declare_lint! {
@@ -1646,7 +1646,7 @@ declare_lint! {
     pub RUST_2024_INCOMPATIBLE_PAT,
     Allow,
     "detects patterns whose meaning will change in Rust 2024",
-    @feature_gate = sym::ref_pat_eat_one_layer_2024;
+    @feature_gate = ref_pat_eat_one_layer_2024;
     // FIXME uncomment below upon stabilization
     /*@future_incompatible = FutureIncompatibleInfo {
         reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2024),
@@ -2694,7 +2694,7 @@ declare_lint! {
     pub FUZZY_PROVENANCE_CASTS,
     Allow,
     "a fuzzy integer to pointer cast is used",
-    @feature_gate = sym::strict_provenance;
+    @feature_gate = strict_provenance;
 }
 
 declare_lint! {
@@ -2740,7 +2740,7 @@ declare_lint! {
     pub LOSSY_PROVENANCE_CASTS,
     Allow,
     "a lossy pointer to integer cast is used",
-    @feature_gate = sym::strict_provenance;
+    @feature_gate = strict_provenance;
 }
 
 declare_lint! {
@@ -3924,7 +3924,7 @@ declare_lint! {
     pub NON_EXHAUSTIVE_OMITTED_PATTERNS,
     Allow,
     "detect when patterns of types marked `non_exhaustive` are missed",
-    @feature_gate = sym::non_exhaustive_omitted_patterns_lint;
+    @feature_gate = non_exhaustive_omitted_patterns_lint;
 }
 
 declare_lint! {
@@ -4044,7 +4044,7 @@ declare_lint! {
     pub TEST_UNSTABLE_LINT,
     Deny,
     "this unstable lint is only for testing",
-    @feature_gate = sym::test_unstable_lint;
+    @feature_gate = test_unstable_lint;
 }
 
 declare_lint! {
@@ -4619,7 +4619,7 @@ declare_lint! {
     /// [against]: https://github.com/rust-lang/rust/issues/38831
     /// [future-incompatible]: ../index.md#future-incompatible-lints
     pub ELIDED_LIFETIMES_IN_ASSOCIATED_CONSTANT,
-    Warn,
+    Deny,
     "elided lifetimes cannot be used in associated constants in impls",
     @future_incompatible = FutureIncompatibleInfo {
         reason: FutureIncompatibilityReason::FutureReleaseErrorDontReportInDeps,
@@ -4938,6 +4938,58 @@ declare_lint! {
     };
 }
 
+declare_lint! {
+    /// The `ptr_cast_add_auto_to_object` lint detects casts of raw pointers to trait
+    /// objects, which add auto traits.
+    ///
+    /// ### Example
+    ///
+    /// ```rust,edition2021,compile_fail
+    /// let ptr: *const dyn core::any::Any = &();
+    /// _ = ptr as *const dyn core::any::Any + Send;
+    /// ```
+    ///
+    /// {{produces}}
+    ///
+    /// ### Explanation
+    ///
+    /// Adding an auto trait can make the vtable invalid, potentially causing
+    /// UB in safe code afterwards. For example:
+    ///
+    /// ```ignore (causes a warning)
+    /// #![feature(arbitrary_self_types)]
+    ///
+    /// trait Trait {
+    ///     fn f(self: *const Self)
+    ///     where
+    ///         Self: Send;
+    /// }
+    ///
+    /// impl Trait for *const () {
+    ///     fn f(self: *const Self) {
+    ///         unreachable!()
+    ///     }
+    /// }
+    ///
+    /// fn main() {
+    ///     let unsend: *const () = &();
+    ///     let unsend: *const dyn Trait = &unsend;
+    ///     let send_bad: *const (dyn Trait + Send) = unsend as _;
+    ///     send_bad.f(); // this crashes, since vtable for `*const ()` does not have an entry for `f`
+    /// }
+    /// ```
+    ///
+    /// Generally you must ensure that vtable is right for the pointer's type,
+    /// before passing the pointer to safe code.
+    pub PTR_CAST_ADD_AUTO_TO_OBJECT,
+    Warn,
+    "detects `as` casts from pointers to `dyn Trait` to pointers to `dyn Trait + Auto`",
+    @future_incompatible = FutureIncompatibleInfo {
+        reason: FutureIncompatibilityReason::FutureReleaseErrorReportInDeps,
+        reference: "issue #127323 <https://github.com/rust-lang/rust/issues/127323>",
+    };
+}
+
 declare_lint! {
     /// The `out_of_scope_macro_calls` lint detects `macro_rules` called when they are not in scope,
     /// above their definition, which may happen in key-value attributes.
diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs
index b44eb25216770..f87f19e170005 100644
--- a/compiler/rustc_lint_defs/src/lib.rs
+++ b/compiler/rustc_lint_defs/src/lib.rs
@@ -865,7 +865,7 @@ macro_rules! declare_lint {
         );
     );
     ($(#[$attr:meta])* $vis: vis $NAME: ident, $Level: ident, $desc: expr,
-     $(@feature_gate = $gate:expr;)?
+     $(@feature_gate = $gate:ident;)?
      $(@future_incompatible = FutureIncompatibleInfo {
         reason: $reason:expr,
         $($field:ident : $val:expr),* $(,)*
@@ -879,7 +879,7 @@ macro_rules! declare_lint {
             desc: $desc,
             is_externally_loaded: false,
             $($v: true,)*
-            $(feature_gate: Some($gate),)?
+            $(feature_gate: Some(rustc_span::symbol::sym::$gate),)?
             $(future_incompatible: Some($crate::FutureIncompatibleInfo {
                 reason: $reason,
                 $($field: $val,)*
@@ -895,21 +895,21 @@ macro_rules! declare_lint {
 macro_rules! declare_tool_lint {
     (
         $(#[$attr:meta])* $vis:vis $tool:ident ::$NAME:ident, $Level: ident, $desc: expr
-        $(, @feature_gate = $gate:expr;)?
+        $(, @feature_gate = $gate:ident;)?
     ) => (
         $crate::declare_tool_lint!{$(#[$attr])* $vis $tool::$NAME, $Level, $desc, false $(, @feature_gate = $gate;)?}
     );
     (
         $(#[$attr:meta])* $vis:vis $tool:ident ::$NAME:ident, $Level:ident, $desc:expr,
         report_in_external_macro: $rep:expr
-        $(, @feature_gate = $gate:expr;)?
+        $(, @feature_gate = $gate:ident;)?
     ) => (
          $crate::declare_tool_lint!{$(#[$attr])* $vis $tool::$NAME, $Level, $desc, $rep $(, @feature_gate = $gate;)?}
     );
     (
         $(#[$attr:meta])* $vis:vis $tool:ident ::$NAME:ident, $Level:ident, $desc:expr,
         $external:expr
-        $(, @feature_gate = $gate:expr;)?
+        $(, @feature_gate = $gate:ident;)?
     ) => (
         $(#[$attr])*
         $vis static $NAME: &$crate::Lint = &$crate::Lint {
@@ -920,7 +920,7 @@ macro_rules! declare_tool_lint {
             report_in_external_macro: $external,
             future_incompatible: None,
             is_externally_loaded: true,
-            $(feature_gate: Some($gate),)?
+            $(feature_gate: Some(rustc_span::symbol::sym::$gate),)?
             crate_level_only: false,
             ..$crate::Lint::default_fields_for_macro()
         };
diff --git a/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs b/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
index 46bd80c2df64d..f93d89d6c0f04 100644
--- a/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
+++ b/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
@@ -269,6 +269,7 @@ impl DiagnosticDeriveVariantBuilder {
         let field_binding = &binding_info.binding;
 
         let inner_ty = FieldInnerTy::from_type(&field.ty);
+        let mut seen_label = false;
 
         field
             .attrs
@@ -280,6 +281,14 @@ impl DiagnosticDeriveVariantBuilder {
                 }
 
                 let name = attr.path().segments.last().unwrap().ident.to_string();
+
+                if name == "primary_span" && seen_label {
+                    span_err(attr.span().unwrap(), format!("`#[primary_span]` must be placed before labels, since it overwrites the span of the diagnostic")).emit();
+                }
+                if name == "label" {
+                    seen_label = true;
+                }
+
                 let needs_clone =
                     name == "primary_span" && matches!(inner_ty, FieldInnerTy::Vec(_));
                 let (binding, needs_destructure) = if needs_clone {
diff --git a/compiler/rustc_metadata/src/rmeta/decoder.rs b/compiler/rustc_metadata/src/rmeta/decoder.rs
index 83b41e0540edf..0ba9b940eed10 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder.rs
@@ -1133,7 +1133,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
                     .collect(),
                 adt_kind,
                 parent_did,
-                false,
+                None,
                 data.is_non_exhaustive,
                 // FIXME: unnamed fields in crate metadata is unimplemented yet.
                 false,
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index eb25aecd9cef1..22a6786665ca1 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -1212,7 +1212,6 @@ pub fn fn_can_unwind(tcx: TyCtxt<'_>, fn_def_id: Option<DefId>, abi: SpecAbi) ->
         | RiscvInterruptM
         | RiscvInterruptS
         | CCmseNonSecureCall
-        | Wasm
         | Unadjusted => false,
         Rust | RustCall | RustCold | RustIntrinsic => {
             tcx.sess.panic_strategy() == PanicStrategy::Unwind
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 4470db47474cb..9a4562e9cfc83 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -1159,11 +1159,8 @@ bitflags::bitflags! {
         const NO_VARIANT_FLAGS        = 0;
         /// Indicates whether the field list of this variant is `#[non_exhaustive]`.
         const IS_FIELD_LIST_NON_EXHAUSTIVE = 1 << 0;
-        /// Indicates whether this variant was obtained as part of recovering from
-        /// a syntactic error. May be incomplete or bogus.
-        const IS_RECOVERED = 1 << 1;
         /// Indicates whether this variant has unnamed fields.
-        const HAS_UNNAMED_FIELDS = 1 << 2;
+        const HAS_UNNAMED_FIELDS = 1 << 1;
     }
 }
 rustc_data_structures::external_bitflags_debug! { VariantFlags }
@@ -1183,6 +1180,8 @@ pub struct VariantDef {
     pub discr: VariantDiscr,
     /// Fields of this variant.
     pub fields: IndexVec<FieldIdx, FieldDef>,
+    /// The error guarantees from parser, if any.
+    tainted: Option<ErrorGuaranteed>,
     /// Flags of the variant (e.g. is field list non-exhaustive)?
     flags: VariantFlags,
 }
@@ -1212,7 +1211,7 @@ impl VariantDef {
         fields: IndexVec<FieldIdx, FieldDef>,
         adt_kind: AdtKind,
         parent_did: DefId,
-        recovered: bool,
+        recover_tainted: Option<ErrorGuaranteed>,
         is_field_list_non_exhaustive: bool,
         has_unnamed_fields: bool,
     ) -> Self {
@@ -1227,15 +1226,19 @@ impl VariantDef {
             flags |= VariantFlags::IS_FIELD_LIST_NON_EXHAUSTIVE;
         }
 
-        if recovered {
-            flags |= VariantFlags::IS_RECOVERED;
-        }
-
         if has_unnamed_fields {
             flags |= VariantFlags::HAS_UNNAMED_FIELDS;
         }
 
-        VariantDef { def_id: variant_did.unwrap_or(parent_did), ctor, name, discr, fields, flags }
+        VariantDef {
+            def_id: variant_did.unwrap_or(parent_did),
+            ctor,
+            name,
+            discr,
+            fields,
+            flags,
+            tainted: recover_tainted,
+        }
     }
 
     /// Is this field list non-exhaustive?
@@ -1244,12 +1247,6 @@ impl VariantDef {
         self.flags.intersects(VariantFlags::IS_FIELD_LIST_NON_EXHAUSTIVE)
     }
 
-    /// Was this variant obtained as part of recovering from a syntactic error?
-    #[inline]
-    pub fn is_recovered(&self) -> bool {
-        self.flags.intersects(VariantFlags::IS_RECOVERED)
-    }
-
     /// Does this variant contains unnamed fields
     #[inline]
     pub fn has_unnamed_fields(&self) -> bool {
@@ -1261,6 +1258,12 @@ impl VariantDef {
         Ident::new(self.name, tcx.def_ident_span(self.def_id).unwrap())
     }
 
+    /// Was this variant obtained as part of recovering from a syntactic error?
+    #[inline]
+    pub fn has_errors(&self) -> Result<(), ErrorGuaranteed> {
+        self.tainted.map_or(Ok(()), Err)
+    }
+
     #[inline]
     pub fn ctor_kind(&self) -> Option<CtorKind> {
         self.ctor.map(|(kind, _)| kind)
@@ -1308,8 +1311,24 @@ impl PartialEq for VariantDef {
         // definition of `VariantDef` changes, a compile-error will be produced,
         // reminding us to revisit this assumption.
 
-        let Self { def_id: lhs_def_id, ctor: _, name: _, discr: _, fields: _, flags: _ } = &self;
-        let Self { def_id: rhs_def_id, ctor: _, name: _, discr: _, fields: _, flags: _ } = other;
+        let Self {
+            def_id: lhs_def_id,
+            ctor: _,
+            name: _,
+            discr: _,
+            fields: _,
+            flags: _,
+            tainted: _,
+        } = &self;
+        let Self {
+            def_id: rhs_def_id,
+            ctor: _,
+            name: _,
+            discr: _,
+            fields: _,
+            flags: _,
+            tainted: _,
+        } = other;
 
         let res = lhs_def_id == rhs_def_id;
 
@@ -1339,7 +1358,7 @@ impl Hash for VariantDef {
         // of `VariantDef` changes, a compile-error will be produced, reminding
         // us to revisit this assumption.
 
-        let Self { def_id, ctor: _, name: _, discr: _, fields: _, flags: _ } = &self;
+        let Self { def_id, ctor: _, name: _, discr: _, fields: _, flags: _, tainted: _ } = &self;
         def_id.hash(s)
     }
 }
@@ -1967,9 +1986,14 @@ impl<'tcx> TyCtxt<'tcx> {
         ) && self.constness(def_id) == hir::Constness::Const
     }
 
+    #[inline]
+    pub fn is_const_trait(self, def_id: DefId) -> bool {
+        self.trait_def(def_id).constness == hir::Constness::Const
+    }
+
     #[inline]
     pub fn is_const_default_method(self, def_id: DefId) -> bool {
-        matches!(self.trait_of_item(def_id), Some(trait_id) if self.has_attr(trait_id, sym::const_trait))
+        matches!(self.trait_of_item(def_id), Some(trait_id) if self.is_const_trait(trait_id))
     }
 
     pub fn impl_method_has_trait_impl_trait_tys(self, def_id: DefId) -> bool {
diff --git a/compiler/rustc_middle/src/ty/predicate.rs b/compiler/rustc_middle/src/ty/predicate.rs
index c2cc3be3aaa56..5d6352c57ce6a 100644
--- a/compiler/rustc_middle/src/ty/predicate.rs
+++ b/compiler/rustc_middle/src/ty/predicate.rs
@@ -349,6 +349,14 @@ impl<'tcx> ty::List<ty::PolyExistentialPredicate<'tcx>> {
             _ => None,
         })
     }
+
+    pub fn without_auto_traits(
+        &self,
+    ) -> impl Iterator<Item = ty::PolyExistentialPredicate<'tcx>> + '_ {
+        self.iter().filter(|predicate| {
+            !matches!(predicate.as_ref().skip_binder(), ExistentialPredicate::AutoTrait(_))
+        })
+    }
 }
 
 pub type PolyTraitRef<'tcx> = ty::Binder<'tcx, TraitRef<'tcx>>;
diff --git a/compiler/rustc_middle/src/ty/trait_def.rs b/compiler/rustc_middle/src/ty/trait_def.rs
index 076a74ca6f8d7..da5860043c9f8 100644
--- a/compiler/rustc_middle/src/ty/trait_def.rs
+++ b/compiler/rustc_middle/src/ty/trait_def.rs
@@ -18,6 +18,9 @@ pub struct TraitDef {
 
     pub safety: hir::Safety,
 
+    /// Whether this trait has been annotated with `#[const_trait]`.
+    pub constness: hir::Constness,
+
     /// If `true`, then this trait had the `#[rustc_paren_sugar]`
     /// attribute, indicating that it should be used with `Foo()`
     /// sugar. This is a temporary thing -- eventually any trait will
diff --git a/compiler/rustc_mir_build/src/build/matches/mod.rs b/compiler/rustc_mir_build/src/build/matches/mod.rs
index e435e2f92883c..841ef2719c99d 100644
--- a/compiler/rustc_mir_build/src/build/matches/mod.rs
+++ b/compiler/rustc_mir_build/src/build/matches/mod.rs
@@ -1119,6 +1119,11 @@ impl<'tcx, 'pat> Candidate<'pat, 'tcx> {
         }
     }
 
+    /// Returns whether the first match pair of this candidate is an or-pattern.
+    fn starts_with_or_pattern(&self) -> bool {
+        matches!(&*self.match_pairs, [MatchPair { test_case: TestCase::Or { .. }, .. }, ..])
+    }
+
     /// Visit the leaf candidates (those with no subcandidates) contained in
     /// this candidate.
     fn visit_leaves<'a>(&'a mut self, mut visit_leaf: impl FnMut(&'a mut Self)) {
@@ -1308,11 +1313,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         candidates: &mut [&mut Candidate<'pat, 'tcx>],
         refutable: bool,
     ) -> BasicBlock {
+        // This will generate code to test scrutinee_place and branch to the appropriate arm block.
         // See the doc comment on `match_candidates` for why we have an otherwise block.
-        let otherwise_block = self.cfg.start_new_block();
-
-        // This will generate code to test scrutinee_place and branch to the appropriate arm block
-        self.match_candidates(match_start_span, scrutinee_span, block, otherwise_block, candidates);
+        let otherwise_block =
+            self.match_candidates(match_start_span, scrutinee_span, block, candidates);
 
         // Link each leaf candidate to the `false_edge_start_block` of the next one.
         let mut previous_candidate: Option<&mut Candidate<'_, '_>> = None;
@@ -1363,27 +1367,24 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         otherwise_block
     }
 
-    /// The main match algorithm. It begins with a set of candidates
-    /// `candidates` and has the job of generating code to determine
-    /// which of these candidates, if any, is the correct one. The
+    /// The main match algorithm. It begins with a set of candidates `candidates` and has the job of
+    /// generating code that branches to an appropriate block if the scrutinee matches one of these
+    /// candidates. The
     /// candidates are sorted such that the first item in the list
     /// has the highest priority. When a candidate is found to match
     /// the value, we will set and generate a branch to the appropriate
     /// pre-binding block.
     ///
-    /// If we find that *NONE* of the candidates apply, we branch to `otherwise_block`.
+    /// If none of the candidates apply, we continue to the returned `otherwise_block`.
     ///
     /// It might be surprising that the input can be non-exhaustive.
-    /// Indeed, initially, it is not, because all matches are
+    /// Indeed, for matches, initially, it is not, because all matches are
     /// exhaustive in Rust. But during processing we sometimes divide
     /// up the list of candidates and recurse with a non-exhaustive
     /// list. This is how our lowering approach (called "backtracking
     /// automaton" in the literature) works.
     /// See [`Builder::test_candidates`] for more details.
     ///
-    /// If `fake_borrows` is `Some`, then places which need fake borrows
-    /// will be added to it.
-    ///
     /// For an example of how we use `otherwise_block`, consider:
     /// ```
     /// # fn foo((x, y): (bool, bool)) -> u32 {
@@ -1408,7 +1409,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// }
     /// if y {
     ///     if x {
-    ///         // This is actually unreachable because the `(true, true)` case was handled above.
+    ///         // This is actually unreachable because the `(true, true)` case was handled above,
+    ///         // but we don't know that from within the lowering algorithm.
     ///         // continue
     ///     } else {
     ///         return 3
@@ -1425,158 +1427,61 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// the algorithm. For more details on why we lower like this, see [`Builder::test_candidates`].
     ///
     /// Note how we test `x` twice. This is the tradeoff of backtracking automata: we prefer smaller
-    /// code size at the expense of non-optimal code paths.
+    /// code size so we accept non-optimal code paths.
     #[instrument(skip(self), level = "debug")]
-    fn match_candidates<'pat>(
+    fn match_candidates(
         &mut self,
         span: Span,
         scrutinee_span: Span,
         start_block: BasicBlock,
-        otherwise_block: BasicBlock,
-        candidates: &mut [&mut Candidate<'pat, 'tcx>],
-    ) {
-        // We process or-patterns here. If any candidate starts with an or-pattern, we have to
-        // expand the or-pattern before we can proceed further.
-        //
-        // We can't expand them freely however. The rule is: if the candidate has an or-pattern as
-        // its only remaining match pair, we can expand it freely. If it has other match pairs, we
-        // can expand it but we can't process more candidates after it.
-        //
-        // If we didn't stop, the `otherwise` cases could get mixed up. E.g. in the following,
-        // or-pattern simplification (in `merge_trivial_subcandidates`) makes it so the `1` and `2`
-        // cases branch to a same block (which then tests `false`). If we took `(2, _)` in the same
-        // set of candidates, when we reach the block that tests `false` we don't know whether we
-        // came from `1` or `2`, hence we can't know where to branch on failure.
-        // ```ignore(illustrative)
-        // match (1, true) {
-        //     (1 | 2, false) => {},
-        //     (2, _) => {},
-        //     _ => {}
-        // }
-        // ```
-        //
-        // We therefore split the `candidates` slice in two, expand or-patterns in the first half,
-        // and process both halves separately.
-        let mut expand_until = 0;
-        for (i, candidate) in candidates.iter().enumerate() {
-            if matches!(
-                &*candidate.match_pairs,
-                [MatchPair { test_case: TestCase::Or { .. }, .. }, ..]
-            ) {
-                expand_until = i + 1;
-                if candidate.match_pairs.len() > 1 {
-                    break;
-                }
-            }
-        }
-        let (candidates_to_expand, remaining_candidates) = candidates.split_at_mut(expand_until);
-
+        candidates: &mut [&mut Candidate<'_, 'tcx>],
+    ) -> BasicBlock {
         ensure_sufficient_stack(|| {
-            if candidates_to_expand.is_empty() {
-                // No candidates start with an or-pattern, we can continue.
-                self.match_expanded_candidates(
-                    span,
-                    scrutinee_span,
-                    start_block,
-                    otherwise_block,
-                    remaining_candidates,
-                );
-            } else {
-                // Expand one level of or-patterns for each candidate in `candidates_to_expand`.
-                let mut expanded_candidates = Vec::new();
-                for candidate in candidates_to_expand.iter_mut() {
-                    if let [MatchPair { test_case: TestCase::Or { .. }, .. }, ..] =
-                        &*candidate.match_pairs
-                    {
-                        let or_match_pair = candidate.match_pairs.remove(0);
-                        // Expand the or-pattern into subcandidates.
-                        self.create_or_subcandidates(candidate, or_match_pair);
-                        // Collect the newly created subcandidates.
-                        for subcandidate in candidate.subcandidates.iter_mut() {
-                            expanded_candidates.push(subcandidate);
-                        }
-                    } else {
-                        expanded_candidates.push(candidate);
-                    }
-                }
-
-                // Process the expanded candidates.
-                let remainder_start = self.cfg.start_new_block();
-                // There might be new or-patterns obtained from expanding the old ones, so we call
-                // `match_candidates` again.
-                self.match_candidates(
-                    span,
-                    scrutinee_span,
-                    start_block,
-                    remainder_start,
-                    expanded_candidates.as_mut_slice(),
-                );
-
-                // Simplify subcandidates and process any leftover match pairs.
-                for candidate in candidates_to_expand {
-                    if !candidate.subcandidates.is_empty() {
-                        self.finalize_or_candidate(span, scrutinee_span, candidate);
-                    }
-                }
-
-                // Process the remaining candidates.
-                self.match_candidates(
-                    span,
-                    scrutinee_span,
-                    remainder_start,
-                    otherwise_block,
-                    remaining_candidates,
-                );
-            }
-        });
+            self.match_candidates_inner(span, scrutinee_span, start_block, candidates)
+        })
     }
 
-    /// Construct the decision tree for `candidates`. Caller must ensure that no candidate in
-    /// `candidates` starts with an or-pattern.
-    fn match_expanded_candidates(
+    /// Construct the decision tree for `candidates`. Don't call this, call `match_candidates`
+    /// instead to reserve sufficient stack space.
+    fn match_candidates_inner(
         &mut self,
         span: Span,
         scrutinee_span: Span,
         mut start_block: BasicBlock,
-        otherwise_block: BasicBlock,
         candidates: &mut [&mut Candidate<'_, 'tcx>],
-    ) {
+    ) -> BasicBlock {
         if let [first, ..] = candidates {
             if first.false_edge_start_block.is_none() {
                 first.false_edge_start_block = Some(start_block);
             }
         }
 
-        match candidates {
+        // Process a prefix of the candidates.
+        let rest = match candidates {
             [] => {
-                // If there are no candidates that still need testing, we're done. Since all matches are
-                // exhaustive, execution should never reach this point.
-                let source_info = self.source_info(span);
-                self.cfg.goto(start_block, source_info, otherwise_block);
+                // If there are no candidates that still need testing, we're done.
+                return start_block;
             }
             [first, remaining @ ..] if first.match_pairs.is_empty() => {
                 // The first candidate has satisfied all its match pairs; we link it up and continue
                 // with the remaining candidates.
-                start_block = self.select_matched_candidate(first, start_block);
-                self.match_expanded_candidates(
-                    span,
-                    scrutinee_span,
-                    start_block,
-                    otherwise_block,
-                    remaining,
-                )
+                let remainder_start = self.select_matched_candidate(first, start_block);
+                remainder_start.and(remaining)
+            }
+            candidates if candidates.iter().any(|candidate| candidate.starts_with_or_pattern()) => {
+                // If any candidate starts with an or-pattern, we have to expand the or-pattern before we
+                // can proceed further.
+                self.expand_and_match_or_candidates(span, scrutinee_span, start_block, candidates)
             }
             candidates => {
                 // The first candidate has some unsatisfied match pairs; we proceed to do more tests.
-                self.test_candidates(
-                    span,
-                    scrutinee_span,
-                    candidates,
-                    start_block,
-                    otherwise_block,
-                );
+                self.test_candidates(span, scrutinee_span, candidates, start_block)
             }
-        }
+        };
+
+        // Process any candidates that remain.
+        let remaining_candidates = unpack!(start_block = rest);
+        self.match_candidates(span, scrutinee_span, start_block, remaining_candidates)
     }
 
     /// Link up matched candidates.
@@ -1621,6 +1526,102 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         otherwise_block
     }
 
+    /// Takes a list of candidates such that some of the candidates' first match pairs are
+    /// or-patterns. This expands as many or-patterns as possible and processes the resulting
+    /// candidates. Returns the unprocessed candidates if any.
+    fn expand_and_match_or_candidates<'pat, 'b, 'c>(
+        &mut self,
+        span: Span,
+        scrutinee_span: Span,
+        start_block: BasicBlock,
+        candidates: &'b mut [&'c mut Candidate<'pat, 'tcx>],
+    ) -> BlockAnd<&'b mut [&'c mut Candidate<'pat, 'tcx>]> {
+        // We can't expand or-patterns freely. The rule is: if the candidate has an
+        // or-pattern as its only remaining match pair, we can expand it freely. If it has
+        // other match pairs, we can expand it but we can't process more candidates after
+        // it.
+        //
+        // If we didn't stop, the `otherwise` cases could get mixed up. E.g. in the
+        // following, or-pattern simplification (in `merge_trivial_subcandidates`) makes it
+        // so the `1` and `2` cases branch to a same block (which then tests `false`). If we
+        // took `(2, _)` in the same set of candidates, when we reach the block that tests
+        // `false` we don't know whether we came from `1` or `2`, hence we can't know where
+        // to branch on failure.
+        //
+        // ```ignore(illustrative)
+        // match (1, true) {
+        //     (1 | 2, false) => {},
+        //     (2, _) => {},
+        //     _ => {}
+        // }
+        // ```
+        //
+        // We therefore split the `candidates` slice in two, expand or-patterns in the first half,
+        // and process the rest separately.
+        let mut expand_until = 0;
+        for (i, candidate) in candidates.iter().enumerate() {
+            expand_until = i + 1;
+            if candidate.match_pairs.len() > 1 && candidate.starts_with_or_pattern() {
+                // The candidate has an or-pattern as well as more match pairs: we must
+                // split the candidates list here.
+                break;
+            }
+        }
+        let (candidates_to_expand, remaining_candidates) = candidates.split_at_mut(expand_until);
+
+        // Expand one level of or-patterns for each candidate in `candidates_to_expand`.
+        let mut expanded_candidates = Vec::new();
+        for candidate in candidates_to_expand.iter_mut() {
+            if candidate.starts_with_or_pattern() {
+                let or_match_pair = candidate.match_pairs.remove(0);
+                // Expand the or-pattern into subcandidates.
+                self.create_or_subcandidates(candidate, or_match_pair);
+                // Collect the newly created subcandidates.
+                for subcandidate in candidate.subcandidates.iter_mut() {
+                    expanded_candidates.push(subcandidate);
+                }
+            } else {
+                expanded_candidates.push(candidate);
+            }
+        }
+
+        // Process the expanded candidates.
+        let remainder_start = self.match_candidates(
+            span,
+            scrutinee_span,
+            start_block,
+            expanded_candidates.as_mut_slice(),
+        );
+
+        // Simplify subcandidates and process any leftover match pairs.
+        for candidate in candidates_to_expand {
+            if !candidate.subcandidates.is_empty() {
+                self.finalize_or_candidate(span, scrutinee_span, candidate);
+            }
+        }
+
+        remainder_start.and(remaining_candidates)
+    }
+
+    /// Given a match-pair that corresponds to an or-pattern, expand each subpattern into a new
+    /// subcandidate. Any candidate that has been expanded that way should be passed to
+    /// `finalize_or_candidate` after its subcandidates have been processed.
+    fn create_or_subcandidates<'pat>(
+        &mut self,
+        candidate: &mut Candidate<'pat, 'tcx>,
+        match_pair: MatchPair<'pat, 'tcx>,
+    ) {
+        let TestCase::Or { pats } = match_pair.test_case else { bug!() };
+        debug!("expanding or-pattern: candidate={:#?}\npats={:#?}", candidate, pats);
+        candidate.or_span = Some(match_pair.pattern.span);
+        candidate.subcandidates = pats
+            .into_vec()
+            .into_iter()
+            .map(|flat_pat| Candidate::from_flat_pat(flat_pat, candidate.has_guard))
+            .collect();
+        candidate.subcandidates[0].false_edge_start_block = candidate.false_edge_start_block;
+    }
+
     /// Simplify subcandidates and process any leftover match pairs. The candidate should have been
     /// expanded with `create_or_subcandidates`.
     ///
@@ -1687,6 +1688,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         self.merge_trivial_subcandidates(candidate);
 
         if !candidate.match_pairs.is_empty() {
+            let or_span = candidate.or_span.unwrap_or(candidate.extra_data.span);
+            let source_info = self.source_info(or_span);
             // If more match pairs remain, test them after each subcandidate.
             // We could add them to the or-candidates before the call to `test_or_pattern` but this
             // would make it impossible to detect simplifiable or-patterns. That would guarantee
@@ -1700,6 +1703,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 assert!(leaf_candidate.match_pairs.is_empty());
                 leaf_candidate.match_pairs.extend(remaining_match_pairs.iter().cloned());
                 let or_start = leaf_candidate.pre_binding_block.unwrap();
+                let otherwise =
+                    self.match_candidates(span, scrutinee_span, or_start, &mut [leaf_candidate]);
                 // In a case like `(P | Q, R | S)`, if `P` succeeds and `R | S` fails, we know `(Q,
                 // R | S)` will fail too. If there is no guard, we skip testing of `Q` by branching
                 // directly to `last_otherwise`. If there is a guard,
@@ -1710,36 +1715,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 } else {
                     last_otherwise.unwrap()
                 };
-                self.match_candidates(
-                    span,
-                    scrutinee_span,
-                    or_start,
-                    or_otherwise,
-                    &mut [leaf_candidate],
-                );
+                self.cfg.goto(otherwise, source_info, or_otherwise);
             });
         }
     }
 
-    /// Given a match-pair that corresponds to an or-pattern, expand each subpattern into a new
-    /// subcandidate. Any candidate that has been expanded that way should be passed to
-    /// `finalize_or_candidate` after its subcandidates have been processed.
-    fn create_or_subcandidates<'pat>(
-        &mut self,
-        candidate: &mut Candidate<'pat, 'tcx>,
-        match_pair: MatchPair<'pat, 'tcx>,
-    ) {
-        let TestCase::Or { pats } = match_pair.test_case else { bug!() };
-        debug!("expanding or-pattern: candidate={:#?}\npats={:#?}", candidate, pats);
-        candidate.or_span = Some(match_pair.pattern.span);
-        candidate.subcandidates = pats
-            .into_vec()
-            .into_iter()
-            .map(|flat_pat| Candidate::from_flat_pat(flat_pat, candidate.has_guard))
-            .collect();
-        candidate.subcandidates[0].false_edge_start_block = candidate.false_edge_start_block;
-    }
-
     /// Try to merge all of the subcandidates of the given candidate into one. This avoids
     /// exponentially large CFGs in cases like `(1 | 2, 3 | 4, ...)`. The candidate should have been
     /// expanded with `create_or_subcandidates`.
@@ -1989,14 +1969,15 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// }
     /// # }
     /// ```
+    ///
+    /// We return the unprocessed candidates.
     fn test_candidates<'pat, 'b, 'c>(
         &mut self,
         span: Span,
         scrutinee_span: Span,
         candidates: &'b mut [&'c mut Candidate<'pat, 'tcx>],
         start_block: BasicBlock,
-        otherwise_block: BasicBlock,
-    ) {
+    ) -> BlockAnd<&'b mut [&'c mut Candidate<'pat, 'tcx>]> {
         // Extract the match-pair from the highest priority candidate and build a test from it.
         let (match_place, test) = self.pick_test(candidates);
 
@@ -2007,33 +1988,18 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
 
         // The block that we should branch to if none of the
         // `target_candidates` match.
-        let remainder_start = if !remaining_candidates.is_empty() {
-            let remainder_start = self.cfg.start_new_block();
-            self.match_candidates(
-                span,
-                scrutinee_span,
-                remainder_start,
-                otherwise_block,
-                remaining_candidates,
-            );
-            remainder_start
-        } else {
-            otherwise_block
-        };
+        let remainder_start = self.cfg.start_new_block();
 
         // For each outcome of test, process the candidates that still apply.
         let target_blocks: FxIndexMap<_, _> = target_candidates
             .into_iter()
             .map(|(branch, mut candidates)| {
-                let candidate_start = self.cfg.start_new_block();
-                self.match_candidates(
-                    span,
-                    scrutinee_span,
-                    candidate_start,
-                    remainder_start,
-                    &mut *candidates,
-                );
-                (branch, candidate_start)
+                let branch_start = self.cfg.start_new_block();
+                let branch_otherwise =
+                    self.match_candidates(span, scrutinee_span, branch_start, &mut *candidates);
+                let source_info = self.source_info(span);
+                self.cfg.goto(branch_otherwise, source_info, remainder_start);
+                (branch, branch_start)
             })
             .collect();
 
@@ -2047,6 +2013,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             &test,
             target_blocks,
         );
+
+        remainder_start.and(remaining_candidates)
     }
 }
 
diff --git a/compiler/rustc_mir_transform/src/coroutine.rs b/compiler/rustc_mir_transform/src/coroutine.rs
index fa5da89e8ba56..261dcd52d710f 100644
--- a/compiler/rustc_mir_transform/src/coroutine.rs
+++ b/compiler/rustc_mir_transform/src/coroutine.rs
@@ -81,8 +81,8 @@ use rustc_span::symbol::sym;
 use rustc_span::Span;
 use rustc_target::abi::{FieldIdx, VariantIdx};
 use rustc_target::spec::PanicStrategy;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt as _;
 use rustc_trait_selection::infer::TyCtxtInferExt as _;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::ObligationCtxt;
 use rustc_trait_selection::traits::{ObligationCause, ObligationCauseCode};
 use std::{iter, ops};
diff --git a/compiler/rustc_mir_transform/src/coverage/mod.rs b/compiler/rustc_mir_transform/src/coverage/mod.rs
index d55bde311c17e..2efca40d18047 100644
--- a/compiler/rustc_mir_transform/src/coverage/mod.rs
+++ b/compiler/rustc_mir_transform/src/coverage/mod.rs
@@ -8,6 +8,10 @@ mod spans;
 mod tests;
 mod unexpand;
 
+use rustc_hir as hir;
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_middle::hir::map::Map;
+use rustc_middle::hir::nested_filter;
 use rustc_middle::mir::coverage::{
     CodeRegion, CoverageKind, DecisionInfo, FunctionCoverageInfo, Mapping, MappingKind,
 };
@@ -465,6 +469,9 @@ struct ExtractedHirInfo {
     /// Must have the same context and filename as the body span.
     fn_sig_span_extended: Option<Span>,
     body_span: Span,
+    /// "Holes" are regions within the body span that should not be included in
+    /// coverage spans for this function (e.g. closures and nested items).
+    hole_spans: Vec<Span>,
 }
 
 fn extract_hir_info<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> ExtractedHirInfo {
@@ -480,7 +487,7 @@ fn extract_hir_info<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> ExtractedHir
 
     let mut body_span = hir_body.value.span;
 
-    use rustc_hir::{Closure, Expr, ExprKind, Node};
+    use hir::{Closure, Expr, ExprKind, Node};
     // Unexpand a closure's body span back to the context of its declaration.
     // This helps with closure bodies that consist of just a single bang-macro,
     // and also with closure bodies produced by async desugaring.
@@ -507,11 +514,78 @@ fn extract_hir_info<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> ExtractedHir
 
     let function_source_hash = hash_mir_source(tcx, hir_body);
 
-    ExtractedHirInfo { function_source_hash, is_async_fn, fn_sig_span_extended, body_span }
+    let hole_spans = extract_hole_spans_from_hir(tcx, body_span, hir_body);
+
+    ExtractedHirInfo {
+        function_source_hash,
+        is_async_fn,
+        fn_sig_span_extended,
+        body_span,
+        hole_spans,
+    }
 }
 
-fn hash_mir_source<'tcx>(tcx: TyCtxt<'tcx>, hir_body: &'tcx rustc_hir::Body<'tcx>) -> u64 {
+fn hash_mir_source<'tcx>(tcx: TyCtxt<'tcx>, hir_body: &'tcx hir::Body<'tcx>) -> u64 {
     // FIXME(cjgillot) Stop hashing HIR manually here.
     let owner = hir_body.id().hir_id.owner;
     tcx.hir_owner_nodes(owner).opt_hash_including_bodies.unwrap().to_smaller_hash().as_u64()
 }
+
+fn extract_hole_spans_from_hir<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    body_span: Span, // Usually `hir_body.value.span`, but not always
+    hir_body: &hir::Body<'tcx>,
+) -> Vec<Span> {
+    struct HolesVisitor<'hir, F> {
+        hir: Map<'hir>,
+        visit_hole_span: F,
+    }
+
+    impl<'hir, F: FnMut(Span)> Visitor<'hir> for HolesVisitor<'hir, F> {
+        /// - We need `NestedFilter::INTRA = true` so that `visit_item` will be called.
+        /// - Bodies of nested items don't actually get visited, because of the
+        ///   `visit_item` override.
+        /// - For nested bodies that are not part of an item, we do want to visit any
+        ///   items contained within them.
+        type NestedFilter = nested_filter::All;
+
+        fn nested_visit_map(&mut self) -> Self::Map {
+            self.hir
+        }
+
+        fn visit_item(&mut self, item: &'hir hir::Item<'hir>) {
+            (self.visit_hole_span)(item.span);
+            // Having visited this item, we don't care about its children,
+            // so don't call `walk_item`.
+        }
+
+        // We override `visit_expr` instead of the more specific expression
+        // visitors, so that we have direct access to the expression span.
+        fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+            match expr.kind {
+                hir::ExprKind::Closure(_) | hir::ExprKind::ConstBlock(_) => {
+                    (self.visit_hole_span)(expr.span);
+                    // Having visited this expression, we don't care about its
+                    // children, so don't call `walk_expr`.
+                }
+
+                // For other expressions, recursively visit as normal.
+                _ => walk_expr(self, expr),
+            }
+        }
+    }
+
+    let mut hole_spans = vec![];
+    let mut visitor = HolesVisitor {
+        hir: tcx.hir(),
+        visit_hole_span: |hole_span| {
+            // Discard any holes that aren't directly visible within the body span.
+            if body_span.contains(hole_span) && body_span.eq_ctxt(hole_span) {
+                hole_spans.push(hole_span);
+            }
+        },
+    };
+
+    visitor.visit_body(hir_body);
+    hole_spans
+}
diff --git a/compiler/rustc_mir_transform/src/coverage/spans.rs b/compiler/rustc_mir_transform/src/coverage/spans.rs
index 7612c01c52ec4..dbc26a2808edd 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans.rs
@@ -8,7 +8,7 @@ use rustc_span::Span;
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
 use crate::coverage::mappings;
 use crate::coverage::spans::from_mir::{
-    extract_covspans_and_holes_from_mir, ExtractedCovspans, Hole, SpanFromMir,
+    extract_covspans_from_mir, ExtractedCovspans, Hole, SpanFromMir,
 };
 use crate::coverage::ExtractedHirInfo;
 
@@ -20,8 +20,8 @@ pub(super) fn extract_refined_covspans(
     basic_coverage_blocks: &CoverageGraph,
     code_mappings: &mut impl Extend<mappings::CodeMapping>,
 ) {
-    let ExtractedCovspans { mut covspans, mut holes } =
-        extract_covspans_and_holes_from_mir(mir_body, hir_info, basic_coverage_blocks);
+    let ExtractedCovspans { mut covspans } =
+        extract_covspans_from_mir(mir_body, hir_info, basic_coverage_blocks);
 
     // First, perform the passes that need macro information.
     covspans.sort_by(|a, b| basic_coverage_blocks.cmp_in_dominator_order(a.bcb, b.bcb));
@@ -45,6 +45,7 @@ pub(super) fn extract_refined_covspans(
     covspans.dedup_by(|b, a| a.span.source_equal(b.span));
 
     // Sort the holes, and merge overlapping/adjacent holes.
+    let mut holes = hir_info.hole_spans.iter().map(|&span| Hole { span }).collect::<Vec<_>>();
     holes.sort_by(|a, b| compare_spans(a.span, b.span));
     holes.dedup_by(|b, a| a.merge_if_overlapping_or_adjacent(b));
 
diff --git a/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs b/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
index a0f8f580b1d38..32bd25bf4b966 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
@@ -1,8 +1,7 @@
 use rustc_middle::bug;
 use rustc_middle::mir::coverage::CoverageKind;
 use rustc_middle::mir::{
-    self, AggregateKind, FakeReadCause, Rvalue, Statement, StatementKind, Terminator,
-    TerminatorKind,
+    self, FakeReadCause, Statement, StatementKind, Terminator, TerminatorKind,
 };
 use rustc_span::{Span, Symbol};
 
@@ -15,13 +14,12 @@ use crate::coverage::ExtractedHirInfo;
 
 pub(crate) struct ExtractedCovspans {
     pub(crate) covspans: Vec<SpanFromMir>,
-    pub(crate) holes: Vec<Hole>,
 }
 
 /// Traverses the MIR body to produce an initial collection of coverage-relevant
 /// spans, each associated with a node in the coverage graph (BCB) and possibly
 /// other metadata.
-pub(crate) fn extract_covspans_and_holes_from_mir(
+pub(crate) fn extract_covspans_from_mir(
     mir_body: &mir::Body<'_>,
     hir_info: &ExtractedHirInfo,
     basic_coverage_blocks: &CoverageGraph,
@@ -29,21 +27,13 @@ pub(crate) fn extract_covspans_and_holes_from_mir(
     let &ExtractedHirInfo { body_span, .. } = hir_info;
 
     let mut covspans = vec![];
-    let mut holes = vec![];
 
     for (bcb, bcb_data) in basic_coverage_blocks.iter_enumerated() {
-        bcb_to_initial_coverage_spans(
-            mir_body,
-            body_span,
-            bcb,
-            bcb_data,
-            &mut covspans,
-            &mut holes,
-        );
+        bcb_to_initial_coverage_spans(mir_body, body_span, bcb, bcb_data, &mut covspans);
     }
 
     // Only add the signature span if we found at least one span in the body.
-    if !covspans.is_empty() || !holes.is_empty() {
+    if !covspans.is_empty() {
         // If there is no usable signature span, add a fake one (before refinement)
         // to avoid an ugly gap between the body start and the first real span.
         // FIXME: Find a more principled way to solve this problem.
@@ -51,7 +41,7 @@ pub(crate) fn extract_covspans_and_holes_from_mir(
         covspans.push(SpanFromMir::for_fn_sig(fn_sig_span));
     }
 
-    ExtractedCovspans { covspans, holes }
+    ExtractedCovspans { covspans }
 }
 
 // Generate a set of coverage spans from the filtered set of `Statement`s and `Terminator`s of
@@ -65,7 +55,6 @@ fn bcb_to_initial_coverage_spans<'a, 'tcx>(
     bcb: BasicCoverageBlock,
     bcb_data: &'a BasicCoverageBlockData,
     initial_covspans: &mut Vec<SpanFromMir>,
-    holes: &mut Vec<Hole>,
 ) {
     for &bb in &bcb_data.basic_blocks {
         let data = &mir_body[bb];
@@ -81,13 +70,7 @@ fn bcb_to_initial_coverage_spans<'a, 'tcx>(
             let expn_span = filtered_statement_span(statement)?;
             let (span, visible_macro) = unexpand(expn_span)?;
 
-            // A statement that looks like the assignment of a closure expression
-            // is treated as a "hole" span, to be carved out of other spans.
-            if is_closure_like(statement) {
-                holes.push(Hole { span });
-            } else {
-                initial_covspans.push(SpanFromMir::new(span, visible_macro, bcb));
-            }
+            initial_covspans.push(SpanFromMir::new(span, visible_macro, bcb));
             Some(())
         };
         for statement in data.statements.iter() {
@@ -105,18 +88,6 @@ fn bcb_to_initial_coverage_spans<'a, 'tcx>(
     }
 }
 
-fn is_closure_like(statement: &Statement<'_>) -> bool {
-    match statement.kind {
-        StatementKind::Assign(box (_, Rvalue::Aggregate(box ref agg_kind, _))) => match agg_kind {
-            AggregateKind::Closure(_, _)
-            | AggregateKind::Coroutine(_, _)
-            | AggregateKind::CoroutineClosure(..) => true,
-            _ => false,
-        },
-        _ => false,
-    }
-}
-
 /// If the MIR `Statement` has a span contributive to computing coverage spans,
 /// return it; otherwise return `None`.
 fn filtered_statement_span(statement: &Statement<'_>) -> Option<Span> {
diff --git a/compiler/rustc_mir_transform/src/gvn.rs b/compiler/rustc_mir_transform/src/gvn.rs
index 2b7d9be6d350b..1002746e553d7 100644
--- a/compiler/rustc_mir_transform/src/gvn.rs
+++ b/compiler/rustc_mir_transform/src/gvn.rs
@@ -1391,11 +1391,15 @@ fn op_to_prop_const<'tcx>(
         let (prov, offset) = pointer.into_parts();
         let alloc_id = prov.alloc_id();
         intern_const_alloc_for_constprop(ecx, alloc_id).ok()?;
-        if matches!(ecx.tcx.global_alloc(alloc_id), GlobalAlloc::Memory(_)) {
-            // `alloc_id` may point to a static. Codegen will choke on an `Indirect` with anything
-            // by `GlobalAlloc::Memory`, so do fall through to copying if needed.
-            // FIXME: find a way to treat this more uniformly
-            // (probably by fixing codegen)
+
+        // `alloc_id` may point to a static. Codegen will choke on an `Indirect` with anything
+        // by `GlobalAlloc::Memory`, so do fall through to copying if needed.
+        // FIXME: find a way to treat this more uniformly (probably by fixing codegen)
+        if let GlobalAlloc::Memory(alloc) = ecx.tcx.global_alloc(alloc_id)
+            // Transmuting a constant is just an offset in the allocation. If the alignment of the
+            // allocation is not enough, fallback to copying into a properly aligned value.
+            && alloc.inner().align >= op.layout.align.abi
+        {
             return Some(ConstValue::Indirect { alloc_id, offset });
         }
     }
diff --git a/compiler/rustc_mir_transform/src/inline.rs b/compiler/rustc_mir_transform/src/inline.rs
index fe73715480f8b..fd9f0fec88ddd 100644
--- a/compiler/rustc_mir_transform/src/inline.rs
+++ b/compiler/rustc_mir_transform/src/inline.rs
@@ -41,6 +41,12 @@ struct CallSite<'tcx> {
 
 impl<'tcx> MirPass<'tcx> for Inline {
     fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
+        // FIXME(#127234): Coverage instrumentation currently doesn't handle inlined
+        // MIR correctly when Modified Condition/Decision Coverage is enabled.
+        if sess.instrument_coverage_mcdc() {
+            return false;
+        }
+
         if let Some(enabled) = sess.opts.unstable_opts.inline_mir {
             return enabled;
         }
diff --git a/compiler/rustc_next_trait_solver/src/solve/mod.rs b/compiler/rustc_next_trait_solver/src/solve/mod.rs
index 24055d6cd832b..c65c5851e9b4f 100644
--- a/compiler/rustc_next_trait_solver/src/solve/mod.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/mod.rs
@@ -48,12 +48,20 @@ enum GoalEvaluationKind {
     Nested,
 }
 
+// FIXME(trait-system-refactor-initiative#117): we don't detect whether a response
+// ended up pulling down any universes.
 fn has_no_inference_or_external_constraints<I: Interner>(
     response: ty::Canonical<I, Response<I>>,
 ) -> bool {
-    response.value.external_constraints.region_constraints.is_empty()
-        && response.value.var_values.is_identity()
-        && response.value.external_constraints.opaque_types.is_empty()
+    let ExternalConstraintsData {
+        ref region_constraints,
+        ref opaque_types,
+        ref normalization_nested_goals,
+    } = *response.value.external_constraints;
+    response.value.var_values.is_identity()
+        && region_constraints.is_empty()
+        && opaque_types.is_empty()
+        && normalization_nested_goals.is_empty()
 }
 
 impl<'a, D, I> EvalCtxt<'a, D>
diff --git a/compiler/rustc_next_trait_solver/src/solve/search_graph.rs b/compiler/rustc_next_trait_solver/src/solve/search_graph.rs
index 2cd3b10f56adb..69d52dcad7a59 100644
--- a/compiler/rustc_next_trait_solver/src/solve/search_graph.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/search_graph.rs
@@ -71,7 +71,7 @@ struct StackEntry<I: Interner> {
     /// C :- D
     /// D :- C
     /// ```
-    cycle_participants: HashSet<CanonicalInput<I>>,
+    nested_goals: HashSet<CanonicalInput<I>>,
     /// Starts out as `None` and gets set when rerunning this
     /// goal in case we encounter a cycle.
     provisional_result: Option<QueryResult<I>>,
@@ -139,18 +139,11 @@ impl<I: Interner> SearchGraph<I> {
         self.mode
     }
 
-    /// Pops the highest goal from the stack, lazily updating the
-    /// the next goal in the stack.
-    ///
-    /// Directly popping from the stack instead of using this method
-    /// would cause us to not track overflow and recursion depth correctly.
-    fn pop_stack(&mut self) -> StackEntry<I> {
-        let elem = self.stack.pop().unwrap();
-        if let Some(last) = self.stack.raw.last_mut() {
-            last.reached_depth = last.reached_depth.max(elem.reached_depth);
-            last.encountered_overflow |= elem.encountered_overflow;
+    fn update_parent_goal(&mut self, reached_depth: StackDepth, encountered_overflow: bool) {
+        if let Some(parent) = self.stack.raw.last_mut() {
+            parent.reached_depth = parent.reached_depth.max(reached_depth);
+            parent.encountered_overflow |= encountered_overflow;
         }
-        elem
     }
 
     pub(super) fn is_empty(&self) -> bool {
@@ -222,8 +215,8 @@ impl<I: Interner> SearchGraph<I> {
         let current_cycle_root = &mut stack[current_root.as_usize()];
         for entry in cycle_participants {
             entry.non_root_cycle_participant = entry.non_root_cycle_participant.max(Some(head));
-            current_cycle_root.cycle_participants.insert(entry.input);
-            current_cycle_root.cycle_participants.extend(mem::take(&mut entry.cycle_participants));
+            current_cycle_root.nested_goals.insert(entry.input);
+            current_cycle_root.nested_goals.extend(mem::take(&mut entry.nested_goals));
         }
     }
 
@@ -342,7 +335,7 @@ impl<I: Interner> SearchGraph<I> {
                 non_root_cycle_participant: None,
                 encountered_overflow: false,
                 has_been_used: HasBeenUsed::empty(),
-                cycle_participants: Default::default(),
+                nested_goals: Default::default(),
                 provisional_result: None,
             };
             assert_eq!(self.stack.push(entry), depth);
@@ -364,7 +357,7 @@ impl<I: Interner> SearchGraph<I> {
             }
 
             debug!("canonical cycle overflow");
-            let current_entry = self.pop_stack();
+            let current_entry = self.stack.pop().unwrap();
             debug_assert!(current_entry.has_been_used.is_empty());
             let result = Self::response_no_constraints(cx, input, Certainty::overflow(false));
             (current_entry, result)
@@ -372,6 +365,8 @@ impl<I: Interner> SearchGraph<I> {
 
         let proof_tree = inspect.finalize_canonical_goal_evaluation(cx);
 
+        self.update_parent_goal(final_entry.reached_depth, final_entry.encountered_overflow);
+
         // We're now done with this goal. In case this goal is involved in a larger cycle
         // do not remove it from the provisional cache and update its provisional result.
         // We only add the root of cycles to the global cache.
@@ -394,7 +389,7 @@ impl<I: Interner> SearchGraph<I> {
             //
             // We must not use the global cache entry of a root goal if a cycle
             // participant is on the stack. This is necessary to prevent unstable
-            // results. See the comment of `StackEntry::cycle_participants` for
+            // results. See the comment of `StackEntry::nested_goals` for
             // more details.
             self.global_cache(cx).insert(
                 cx,
@@ -402,7 +397,7 @@ impl<I: Interner> SearchGraph<I> {
                 proof_tree,
                 reached_depth,
                 final_entry.encountered_overflow,
-                final_entry.cycle_participants,
+                final_entry.nested_goals,
                 dep_node,
                 result,
             )
@@ -441,14 +436,9 @@ impl<I: Interner> SearchGraph<I> {
             }
         }
 
-        // Update the reached depth of the current goal to make sure
-        // its state is the same regardless of whether we've used the
-        // global cache or not.
+        // Adjust the parent goal as if we actually computed this goal.
         let reached_depth = self.stack.next_index().plus(additional_depth);
-        if let Some(last) = self.stack.raw.last_mut() {
-            last.reached_depth = last.reached_depth.max(reached_depth);
-            last.encountered_overflow |= encountered_overflow;
-        }
+        self.update_parent_goal(reached_depth, encountered_overflow);
 
         Some(result)
     }
@@ -477,7 +467,7 @@ impl<I: Interner> SearchGraph<I> {
         F: FnMut(&mut Self, &mut ProofTreeBuilder<D>) -> QueryResult<I>,
     {
         let result = prove_goal(self, inspect);
-        let stack_entry = self.pop_stack();
+        let stack_entry = self.stack.pop().unwrap();
         debug_assert_eq!(stack_entry.input, input);
 
         // If the current goal is not the root of a cycle, we are done.
@@ -554,27 +544,27 @@ impl<I: Interner> SearchGraph<I> {
                 non_root_cycle_participant,
                 encountered_overflow: _,
                 has_been_used,
-                ref cycle_participants,
+                ref nested_goals,
                 provisional_result,
             } = *entry;
             let cache_entry = provisional_cache.get(&entry.input).unwrap();
             assert_eq!(cache_entry.stack_depth, Some(depth));
             if let Some(head) = non_root_cycle_participant {
                 assert!(head < depth);
-                assert!(cycle_participants.is_empty());
+                assert!(nested_goals.is_empty());
                 assert_ne!(stack[head].has_been_used, HasBeenUsed::empty());
 
                 let mut current_root = head;
                 while let Some(parent) = stack[current_root].non_root_cycle_participant {
                     current_root = parent;
                 }
-                assert!(stack[current_root].cycle_participants.contains(&input));
+                assert!(stack[current_root].nested_goals.contains(&input));
             }
 
-            if !cycle_participants.is_empty() {
+            if !nested_goals.is_empty() {
                 assert!(provisional_result.is_some() || !has_been_used.is_empty());
                 for entry in stack.iter().take(depth.as_usize()) {
-                    assert_eq!(cycle_participants.get(&entry.input), None);
+                    assert_eq!(nested_goals.get(&entry.input), None);
                 }
             }
         }
diff --git a/compiler/rustc_parse/messages.ftl b/compiler/rustc_parse/messages.ftl
index e4c75ac11454a..02c3c87313bcd 100644
--- a/compiler/rustc_parse/messages.ftl
+++ b/compiler/rustc_parse/messages.ftl
@@ -1,9 +1,5 @@
 parse_add_paren = try adding parentheses
 
-parse_ambiguous_missing_keyword_for_item_definition = missing `fn` or `struct` for function or struct definition
-    .suggestion = if you meant to call a macro, try
-    .help = if you meant to call a macro, remove the `pub` and add a trailing `!` after the identifier
-
 parse_ambiguous_range_pattern = the range pattern here has ambiguous interpretation
     .suggestion = add parentheses to clarify the precedence
 
@@ -528,14 +524,23 @@ parse_missing_comma_after_match_arm = expected `,` following `match` arm
 parse_missing_const_type = missing type for `{$kind}` item
     .suggestion = provide a type for the item
 
+parse_missing_enum_for_enum_definition = missing `enum` for enum definition
+    .suggestion = add `enum` here to parse `{$ident}` as an enum
+
+parse_missing_enum_or_struct_for_item_definition = missing `enum` or `struct` for enum or struct definition
+
 parse_missing_expression_in_for_loop = missing expression to iterate on in `for` loop
     .suggestion = try adding an expression to the `for` loop
 
 parse_missing_fn_for_function_definition = missing `fn` for function definition
-    .suggestion = add `fn` here to parse `{$ident}` as a public function
+    .suggestion = add `fn` here to parse `{$ident}` as a function
 
 parse_missing_fn_for_method_definition = missing `fn` for method definition
-    .suggestion = add `fn` here to parse `{$ident}` as a public method
+    .suggestion = add `fn` here to parse `{$ident}` as a method
+
+parse_missing_fn_or_struct_for_item_definition = missing `fn` or `struct` for function or struct definition
+    .suggestion = if you meant to call a macro, try
+    .help = if you meant to call a macro, remove the `pub` and add a trailing `!` after the identifier
 
 parse_missing_fn_params = missing parameters for function definition
     .suggestion = add a parameter list
@@ -555,7 +560,7 @@ parse_missing_semicolon_before_array = expected `;`, found `[`
     .suggestion = consider adding `;` here
 
 parse_missing_struct_for_struct_definition = missing `struct` for struct definition
-    .suggestion = add `struct` here to parse `{$ident}` as a public struct
+    .suggestion = add `struct` here to parse `{$ident}` as a struct
 
 parse_missing_trait_in_trait_impl = missing trait in a trait impl
     .suggestion_add_trait = add a trait here
diff --git a/compiler/rustc_parse/src/errors.rs b/compiler/rustc_parse/src/errors.rs
index 6894f470d88fd..3ae9b6dad998d 100644
--- a/compiler/rustc_parse/src/errors.rs
+++ b/compiler/rustc_parse/src/errors.rs
@@ -1612,28 +1612,44 @@ pub(crate) struct DefaultNotFollowedByItem {
 
 #[derive(Diagnostic)]
 pub(crate) enum MissingKeywordForItemDefinition {
+    #[diag(parse_missing_enum_for_enum_definition)]
+    Enum {
+        #[primary_span]
+        span: Span,
+        #[suggestion(style = "verbose", applicability = "maybe-incorrect", code = "enum ")]
+        insert_span: Span,
+        ident: Ident,
+    },
+    #[diag(parse_missing_enum_or_struct_for_item_definition)]
+    EnumOrStruct {
+        #[primary_span]
+        span: Span,
+    },
     #[diag(parse_missing_struct_for_struct_definition)]
     Struct {
         #[primary_span]
-        #[suggestion(style = "short", applicability = "maybe-incorrect", code = " struct ")]
         span: Span,
+        #[suggestion(style = "verbose", applicability = "maybe-incorrect", code = "struct ")]
+        insert_span: Span,
         ident: Ident,
     },
     #[diag(parse_missing_fn_for_function_definition)]
     Function {
         #[primary_span]
-        #[suggestion(style = "short", applicability = "maybe-incorrect", code = " fn ")]
         span: Span,
+        #[suggestion(style = "verbose", applicability = "maybe-incorrect", code = "fn ")]
+        insert_span: Span,
         ident: Ident,
     },
     #[diag(parse_missing_fn_for_method_definition)]
     Method {
         #[primary_span]
-        #[suggestion(style = "short", applicability = "maybe-incorrect", code = " fn ")]
         span: Span,
+        #[suggestion(style = "verbose", applicability = "maybe-incorrect", code = "fn ")]
+        insert_span: Span,
         ident: Ident,
     },
-    #[diag(parse_ambiguous_missing_keyword_for_item_definition)]
+    #[diag(parse_missing_fn_or_struct_for_item_definition)]
     Ambiguous {
         #[primary_span]
         span: Span,
@@ -1644,7 +1660,12 @@ pub(crate) enum MissingKeywordForItemDefinition {
 
 #[derive(Subdiagnostic)]
 pub(crate) enum AmbiguousMissingKwForItemSub {
-    #[suggestion(parse_suggestion, applicability = "maybe-incorrect", code = "{snippet}!")]
+    #[suggestion(
+        parse_suggestion,
+        style = "verbose",
+        applicability = "maybe-incorrect",
+        code = "{snippet}!"
+    )]
     SuggestMacro {
         #[primary_span]
         span: Span,
diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs
index abb6b51cebd68..d2fea5583b813 100644
--- a/compiler/rustc_parse/src/parser/item.rs
+++ b/compiler/rustc_parse/src/parser/item.rs
@@ -239,6 +239,7 @@ impl<'a> Parser<'a> {
                 self.recover_const_impl(const_span, attrs, def_())?
             } else {
                 self.recover_const_mut(const_span);
+                self.recover_missing_kw_before_item()?;
                 let (ident, generics, ty, expr) = self.parse_const_item()?;
                 (
                     ident,
@@ -311,6 +312,9 @@ impl<'a> Parser<'a> {
                 Case::Insensitive,
             );
         } else if macros_allowed && self.check_path() {
+            if self.isnt_macro_invocation() {
+                self.recover_missing_kw_before_item()?;
+            }
             // MACRO INVOCATION ITEM
             (Ident::empty(), ItemKind::MacCall(P(self.parse_item_macro(vis)?)))
         } else {
@@ -374,25 +378,25 @@ impl<'a> Parser<'a> {
         self.check_ident() && self.look_ahead(1, |t| *t != token::Not && *t != token::PathSep)
     }
 
-    /// Recover on encountering a struct or method definition where the user
-    /// forgot to add the `struct` or `fn` keyword after writing `pub`: `pub S {}`.
+    /// Recover on encountering a struct, enum, or method definition where the user
+    /// forgot to add the `struct`, `enum`, or `fn` keyword
     fn recover_missing_kw_before_item(&mut self) -> PResult<'a, ()> {
-        // Space between `pub` keyword and the identifier
-        //
-        //     pub   S {}
-        //        ^^^ `sp` points here
-        let sp = self.prev_token.span.between(self.token.span);
-        let full_sp = self.prev_token.span.to(self.token.span);
-        let ident_sp = self.token.span;
-
-        let ident = if self.look_ahead(1, |t| {
-            [
-                token::Lt,
-                token::OpenDelim(Delimiter::Brace),
-                token::OpenDelim(Delimiter::Parenthesis),
-            ]
-            .contains(&t.kind)
-        }) {
+        let is_pub = self.prev_token.is_keyword(kw::Pub);
+        let is_const = self.prev_token.is_keyword(kw::Const);
+        let ident_span = self.token.span;
+        let span = if is_pub { self.prev_token.span.to(ident_span) } else { ident_span };
+        let insert_span = ident_span.shrink_to_lo();
+
+        let ident = if self.token.is_ident()
+            && (!is_const || self.look_ahead(1, |t| *t == token::OpenDelim(Delimiter::Parenthesis)))
+            && self.look_ahead(1, |t| {
+                [
+                    token::Lt,
+                    token::OpenDelim(Delimiter::Brace),
+                    token::OpenDelim(Delimiter::Parenthesis),
+                ]
+                .contains(&t.kind)
+            }) {
             self.parse_ident().unwrap()
         } else {
             return Ok(());
@@ -406,46 +410,56 @@ impl<'a> Parser<'a> {
         }
 
         let err = if self.check(&token::OpenDelim(Delimiter::Brace)) {
-            // possible public struct definition where `struct` was forgotten
-            Some(errors::MissingKeywordForItemDefinition::Struct { span: sp, ident })
+            // possible struct or enum definition where `struct` or `enum` was forgotten
+            if self.look_ahead(1, |t| *t == token::CloseDelim(Delimiter::Brace)) {
+                // `S {}` could be unit enum or struct
+                Some(errors::MissingKeywordForItemDefinition::EnumOrStruct { span })
+            } else if self.look_ahead(2, |t| *t == token::Colon)
+                || self.look_ahead(3, |t| *t == token::Colon)
+            {
+                // `S { f:` or `S { pub f:`
+                Some(errors::MissingKeywordForItemDefinition::Struct { span, insert_span, ident })
+            } else {
+                Some(errors::MissingKeywordForItemDefinition::Enum { span, insert_span, ident })
+            }
         } else if self.check(&token::OpenDelim(Delimiter::Parenthesis)) {
-            // possible public function or tuple struct definition where `fn`/`struct` was
-            // forgotten
+            // possible function or tuple struct definition where `fn` or `struct` was forgotten
             self.bump(); // `(`
             let is_method = self.recover_self_param();
 
             self.consume_block(Delimiter::Parenthesis, ConsumeClosingDelim::Yes);
 
-            let err =
-                if self.check(&token::RArrow) || self.check(&token::OpenDelim(Delimiter::Brace)) {
-                    self.eat_to_tokens(&[&token::OpenDelim(Delimiter::Brace)]);
-                    self.bump(); // `{`
-                    self.consume_block(Delimiter::Brace, ConsumeClosingDelim::Yes);
-                    if is_method {
-                        errors::MissingKeywordForItemDefinition::Method { span: sp, ident }
-                    } else {
-                        errors::MissingKeywordForItemDefinition::Function { span: sp, ident }
-                    }
-                } else if self.check(&token::Semi) {
-                    errors::MissingKeywordForItemDefinition::Struct { span: sp, ident }
+            let err = if self.check(&token::RArrow)
+                || self.check(&token::OpenDelim(Delimiter::Brace))
+            {
+                self.eat_to_tokens(&[&token::OpenDelim(Delimiter::Brace)]);
+                self.bump(); // `{`
+                self.consume_block(Delimiter::Brace, ConsumeClosingDelim::Yes);
+                if is_method {
+                    errors::MissingKeywordForItemDefinition::Method { span, insert_span, ident }
                 } else {
-                    errors::MissingKeywordForItemDefinition::Ambiguous {
-                        span: sp,
-                        subdiag: if found_generics {
-                            None
-                        } else if let Ok(snippet) = self.span_to_snippet(ident_sp) {
-                            Some(errors::AmbiguousMissingKwForItemSub::SuggestMacro {
-                                span: full_sp,
-                                snippet,
-                            })
-                        } else {
-                            Some(errors::AmbiguousMissingKwForItemSub::HelpMacro)
-                        },
-                    }
-                };
+                    errors::MissingKeywordForItemDefinition::Function { span, insert_span, ident }
+                }
+            } else if is_pub && self.check(&token::Semi) {
+                errors::MissingKeywordForItemDefinition::Struct { span, insert_span, ident }
+            } else {
+                errors::MissingKeywordForItemDefinition::Ambiguous {
+                    span,
+                    subdiag: if found_generics {
+                        None
+                    } else if let Ok(snippet) = self.span_to_snippet(ident_span) {
+                        Some(errors::AmbiguousMissingKwForItemSub::SuggestMacro {
+                            span: ident_span,
+                            snippet,
+                        })
+                    } else {
+                        Some(errors::AmbiguousMissingKwForItemSub::HelpMacro)
+                    },
+                }
+            };
             Some(err)
         } else if found_generics {
-            Some(errors::MissingKeywordForItemDefinition::Ambiguous { span: sp, subdiag: None })
+            Some(errors::MissingKeywordForItemDefinition::Ambiguous { span, subdiag: None })
         } else {
             None
         };
@@ -796,7 +810,7 @@ impl<'a> Parser<'a> {
                         self.dcx().struct_span_err(non_item_span, "non-item in item list");
                     self.consume_block(Delimiter::Brace, ConsumeClosingDelim::Yes);
                     if is_let {
-                        err.span_suggestion(
+                        err.span_suggestion_verbose(
                             non_item_span,
                             "consider using `const` instead of `let` for associated const",
                             "const",
diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs
index 0eb9d1ce59f1d..ce2fa83810fe8 100644
--- a/compiler/rustc_passes/src/check_attr.rs
+++ b/compiler/rustc_passes/src/check_attr.rs
@@ -34,8 +34,8 @@ use rustc_session::parse::feature_err;
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::{BytePos, Span, DUMMY_SP};
 use rustc_target::spec::abi::Abi;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::infer::{TyCtxtInferExt, ValuePairs};
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 use rustc_trait_selection::traits::ObligationCtxt;
 use std::cell::Cell;
 use std::collections::hash_map::Entry;
diff --git a/compiler/rustc_passes/src/layout_test.rs b/compiler/rustc_passes/src/layout_test.rs
index c9a4765045622..603e98cfa9222 100644
--- a/compiler/rustc_passes/src/layout_test.rs
+++ b/compiler/rustc_passes/src/layout_test.rs
@@ -8,7 +8,7 @@ use rustc_span::source_map::Spanned;
 use rustc_span::symbol::sym;
 use rustc_span::Span;
 use rustc_target::abi::{HasDataLayout, TargetDataLayout};
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtExt;
 use rustc_trait_selection::{infer::TyCtxtInferExt, traits};
 
 use crate::errors::{
diff --git a/compiler/rustc_resolve/src/diagnostics.rs b/compiler/rustc_resolve/src/diagnostics.rs
index ffd495aa9857e..09221041031a2 100644
--- a/compiler/rustc_resolve/src/diagnostics.rs
+++ b/compiler/rustc_resolve/src/diagnostics.rs
@@ -819,7 +819,12 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             ResolutionError::CannotCaptureDynamicEnvironmentInFnItem => {
                 self.dcx().create_err(errs::CannotCaptureDynamicEnvironmentInFnItem { span })
             }
-            ResolutionError::AttemptToUseNonConstantValueInConstant(ident, suggestion, current) => {
+            ResolutionError::AttemptToUseNonConstantValueInConstant {
+                ident,
+                suggestion,
+                current,
+                type_span,
+            } => {
                 // let foo =...
                 //     ^^^ given this Span
                 // ------- get this Span to have an applicable suggestion
@@ -836,13 +841,15 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
 
                 let ((with, with_label), without) = match sp {
                     Some(sp) if !self.tcx.sess.source_map().is_multiline(sp) => {
-                        let sp = sp.with_lo(BytePos(sp.lo().0 - (current.len() as u32)));
+                        let sp = sp
+                            .with_lo(BytePos(sp.lo().0 - (current.len() as u32)))
+                            .until(ident.span);
                         (
                         (Some(errs::AttemptToUseNonConstantValueInConstantWithSuggestion {
                                 span: sp,
-                                ident,
                                 suggestion,
                                 current,
+                                type_span,
                             }), Some(errs::AttemptToUseNonConstantValueInConstantLabelWithSuggestion {span})),
                             None,
                         )
diff --git a/compiler/rustc_resolve/src/errors.rs b/compiler/rustc_resolve/src/errors.rs
index 0620f3d709eb2..097f4af05c305 100644
--- a/compiler/rustc_resolve/src/errors.rs
+++ b/compiler/rustc_resolve/src/errors.rs
@@ -240,16 +240,18 @@ pub(crate) struct AttemptToUseNonConstantValueInConstant<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(
+#[multipart_suggestion(
     resolve_attempt_to_use_non_constant_value_in_constant_with_suggestion,
-    code = "{suggestion} {ident}",
-    applicability = "maybe-incorrect"
+    style = "verbose",
+    applicability = "has-placeholders"
 )]
 pub(crate) struct AttemptToUseNonConstantValueInConstantWithSuggestion<'a> {
-    #[primary_span]
+    // #[primary_span]
+    #[suggestion_part(code = "{suggestion} ")]
     pub(crate) span: Span,
-    pub(crate) ident: Ident,
     pub(crate) suggestion: &'a str,
+    #[suggestion_part(code = ": /* Type */")]
+    pub(crate) type_span: Option<Span>,
     pub(crate) current: &'a str,
 }
 
@@ -1089,8 +1091,8 @@ pub(crate) struct ToolWasAlreadyRegistered {
 #[derive(Diagnostic)]
 #[diag(resolve_tool_only_accepts_identifiers)]
 pub(crate) struct ToolOnlyAcceptsIdentifiers {
-    #[label]
     #[primary_span]
+    #[label]
     pub(crate) span: Span,
     pub(crate) tool: Symbol,
 }
diff --git a/compiler/rustc_resolve/src/ident.rs b/compiler/rustc_resolve/src/ident.rs
index 7d531385e2120..f1934ff184bc3 100644
--- a/compiler/rustc_resolve/src/ident.rs
+++ b/compiler/rustc_resolve/src/ident.rs
@@ -1178,21 +1178,41 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                             if let Some(span) = finalize {
                                 let (span, resolution_error) = match item {
                                     None if rib_ident.as_str() == "self" => (span, LowercaseSelf),
-                                    None => (
-                                        rib_ident.span,
-                                        AttemptToUseNonConstantValueInConstant(
-                                            original_rib_ident_def,
-                                            "const",
-                                            "let",
-                                        ),
-                                    ),
+                                    None => {
+                                        // If we have a `let name = expr;`, we have the span for
+                                        // `name` and use that to see if it is followed by a type
+                                        // specifier. If not, then we know we need to suggest
+                                        // `const name: Ty = expr;`. This is a heuristic, it will
+                                        // break down in the presence of macros.
+                                        let sm = self.tcx.sess.source_map();
+                                        let type_span = match sm.span_look_ahead(
+                                            original_rib_ident_def.span,
+                                            ":",
+                                            None,
+                                        ) {
+                                            None => {
+                                                Some(original_rib_ident_def.span.shrink_to_hi())
+                                            }
+                                            Some(_) => None,
+                                        };
+                                        (
+                                            rib_ident.span,
+                                            AttemptToUseNonConstantValueInConstant {
+                                                ident: original_rib_ident_def,
+                                                suggestion: "const",
+                                                current: "let",
+                                                type_span,
+                                            },
+                                        )
+                                    }
                                     Some((ident, kind)) => (
                                         span,
-                                        AttemptToUseNonConstantValueInConstant(
+                                        AttemptToUseNonConstantValueInConstant {
                                             ident,
-                                            "let",
-                                            kind.as_str(),
-                                        ),
+                                            suggestion: "let",
+                                            current: kind.as_str(),
+                                            type_span: None,
+                                        },
                                     ),
                                 };
                                 self.report_error(span, resolution_error);
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 7cb5a3fb2fd15..3dcb83d65b029 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -236,11 +236,12 @@ enum ResolutionError<'a> {
     /// Error E0434: can't capture dynamic environment in a fn item.
     CannotCaptureDynamicEnvironmentInFnItem,
     /// Error E0435: attempt to use a non-constant value in a constant.
-    AttemptToUseNonConstantValueInConstant(
-        Ident,
-        /* suggestion */ &'static str,
-        /* current */ &'static str,
-    ),
+    AttemptToUseNonConstantValueInConstant {
+        ident: Ident,
+        suggestion: &'static str,
+        current: &'static str,
+        type_span: Option<Span>,
+    },
     /// Error E0530: `X` bindings cannot shadow `Y`s.
     BindingShadowsSomethingUnacceptable {
         shadowing_binding: PatternSource,
diff --git a/compiler/rustc_smir/src/rustc_internal/internal.rs b/compiler/rustc_smir/src/rustc_internal/internal.rs
index 7b5abcf45130d..7c3553b60fddb 100644
--- a/compiler/rustc_smir/src/rustc_internal/internal.rs
+++ b/compiler/rustc_smir/src/rustc_internal/internal.rs
@@ -466,7 +466,6 @@ impl RustcInternal for Abi {
             Abi::AvrInterrupt => rustc_target::spec::abi::Abi::AvrInterrupt,
             Abi::AvrNonBlockingInterrupt => rustc_target::spec::abi::Abi::AvrNonBlockingInterrupt,
             Abi::CCmseNonSecureCall => rustc_target::spec::abi::Abi::CCmseNonSecureCall,
-            Abi::Wasm => rustc_target::spec::abi::Abi::Wasm,
             Abi::System { unwind } => rustc_target::spec::abi::Abi::System { unwind },
             Abi::RustIntrinsic => rustc_target::spec::abi::Abi::RustIntrinsic,
             Abi::RustCall => rustc_target::spec::abi::Abi::RustCall,
diff --git a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
index 9382460d6d403..ef2eb7d52eaef 100644
--- a/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
+++ b/compiler/rustc_smir/src/rustc_smir/convert/ty.rs
@@ -909,7 +909,6 @@ impl<'tcx> Stable<'tcx> for rustc_target::spec::abi::Abi {
             abi::Abi::AvrInterrupt => Abi::AvrInterrupt,
             abi::Abi::AvrNonBlockingInterrupt => Abi::AvrNonBlockingInterrupt,
             abi::Abi::CCmseNonSecureCall => Abi::CCmseNonSecureCall,
-            abi::Abi::Wasm => Abi::Wasm,
             abi::Abi::System { unwind } => Abi::System { unwind },
             abi::Abi::RustIntrinsic => Abi::RustIntrinsic,
             abi::Abi::RustCall => Abi::RustCall,
diff --git a/compiler/rustc_target/src/abi/call/mod.rs b/compiler/rustc_target/src/abi/call/mod.rs
index 8058130f44151..9f13c195e4ce6 100644
--- a/compiler/rustc_target/src/abi/call/mod.rs
+++ b/compiler/rustc_target/src/abi/call/mod.rs
@@ -1,6 +1,6 @@
 use crate::abi::{self, Abi, Align, FieldsShape, Size};
 use crate::abi::{HasDataLayout, TyAbiInterface, TyAndLayout};
-use crate::spec::{self, HasTargetSpec, HasWasmCAbiOpt};
+use crate::spec::{self, HasTargetSpec, HasWasmCAbiOpt, WasmCAbi};
 use rustc_macros::HashStable_Generic;
 use rustc_span::Symbol;
 use std::fmt;
@@ -854,7 +854,8 @@ impl<'a, Ty> FnAbi<'a, Ty> {
             return Ok(());
         }
 
-        match &cx.target_spec().arch[..] {
+        let spec = cx.target_spec();
+        match &spec.arch[..] {
             "x86" => {
                 let flavor = if let spec::abi::Abi::Fastcall { .. }
                 | spec::abi::Abi::Vectorcall { .. } = abi
@@ -901,9 +902,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
             "sparc" => sparc::compute_abi_info(cx, self),
             "sparc64" => sparc64::compute_abi_info(cx, self),
             "nvptx64" => {
-                if cx.target_spec().adjust_abi(cx, abi, self.c_variadic)
-                    == spec::abi::Abi::PtxKernel
-                {
+                if cx.target_spec().adjust_abi(abi, self.c_variadic) == spec::abi::Abi::PtxKernel {
                     nvptx64::compute_ptx_kernel_abi_info(cx, self)
                 } else {
                     nvptx64::compute_abi_info(self)
@@ -912,13 +911,14 @@ impl<'a, Ty> FnAbi<'a, Ty> {
             "hexagon" => hexagon::compute_abi_info(self),
             "xtensa" => xtensa::compute_abi_info(cx, self),
             "riscv32" | "riscv64" => riscv::compute_abi_info(cx, self),
-            "wasm32" | "wasm64" => {
-                if cx.target_spec().adjust_abi(cx, abi, self.c_variadic) == spec::abi::Abi::Wasm {
+            "wasm32" => {
+                if spec.os == "unknown" && cx.wasm_c_abi_opt() == WasmCAbi::Legacy {
                     wasm::compute_wasm_abi_info(self)
                 } else {
                     wasm::compute_c_abi_info(cx, self)
                 }
             }
+            "wasm64" => wasm::compute_c_abi_info(cx, self),
             "bpf" => bpf::compute_abi_info(self),
             arch => {
                 return Err(AdjustForForeignAbiError::Unsupported {
diff --git a/compiler/rustc_target/src/spec/abi/mod.rs b/compiler/rustc_target/src/spec/abi/mod.rs
index bf51bb4bf8256..0d61345a70e41 100644
--- a/compiler/rustc_target/src/spec/abi/mod.rs
+++ b/compiler/rustc_target/src/spec/abi/mod.rs
@@ -48,7 +48,6 @@ pub enum Abi {
     AvrInterrupt,
     AvrNonBlockingInterrupt,
     CCmseNonSecureCall,
-    Wasm,
     System {
         unwind: bool,
     },
@@ -123,7 +122,6 @@ const AbiDatas: &[AbiData] = &[
     AbiData { abi: Abi::AvrInterrupt, name: "avr-interrupt" },
     AbiData { abi: Abi::AvrNonBlockingInterrupt, name: "avr-non-blocking-interrupt" },
     AbiData { abi: Abi::CCmseNonSecureCall, name: "C-cmse-nonsecure-call" },
-    AbiData { abi: Abi::Wasm, name: "wasm" },
     AbiData { abi: Abi::System { unwind: false }, name: "system" },
     AbiData { abi: Abi::System { unwind: true }, name: "system-unwind" },
     AbiData { abi: Abi::RustIntrinsic, name: "rust-intrinsic" },
@@ -149,6 +147,9 @@ pub fn lookup(name: &str) -> Result<Abi, AbiUnsupported> {
         "riscv-interrupt-u" => AbiUnsupported::Reason {
             explain: "user-mode interrupt handlers have been removed from LLVM pending standardization, see: https://reviews.llvm.org/D149314",
         },
+        "wasm" => AbiUnsupported::Reason {
+            explain: "non-standard wasm ABI is no longer supported",
+        },
 
         _ => AbiUnsupported::Unrecognized,
 
@@ -241,10 +242,6 @@ pub fn is_stable(name: &str) -> Result<(), AbiDisabled> {
             feature: sym::abi_c_cmse_nonsecure_call,
             explain: "C-cmse-nonsecure-call ABI is experimental and subject to change",
         }),
-        "wasm" => Err(AbiDisabled::Unstable {
-            feature: sym::wasm_abi,
-            explain: "wasm ABI is experimental and subject to change",
-        }),
         _ => Err(AbiDisabled::Unrecognized),
     }
 }
@@ -287,16 +284,15 @@ impl Abi {
             AvrInterrupt => 23,
             AvrNonBlockingInterrupt => 24,
             CCmseNonSecureCall => 25,
-            Wasm => 26,
             // Cross-platform ABIs
-            System { unwind: false } => 27,
-            System { unwind: true } => 28,
-            RustIntrinsic => 29,
-            RustCall => 30,
-            Unadjusted => 31,
-            RustCold => 32,
-            RiscvInterruptM => 33,
-            RiscvInterruptS => 34,
+            System { unwind: false } => 26,
+            System { unwind: true } => 27,
+            RustIntrinsic => 28,
+            RustCall => 29,
+            Unadjusted => 30,
+            RustCold => 31,
+            RiscvInterruptM => 32,
+            RiscvInterruptS => 33,
         };
         debug_assert!(
             AbiDatas
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 81ada30a59437..607eeac7ccdc3 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -2608,22 +2608,8 @@ impl DerefMut for Target {
 
 impl Target {
     /// Given a function ABI, turn it into the correct ABI for this target.
-    pub fn adjust_abi<C>(&self, cx: &C, abi: Abi, c_variadic: bool) -> Abi
-    where
-        C: HasWasmCAbiOpt,
-    {
+    pub fn adjust_abi(&self, abi: Abi, c_variadic: bool) -> Abi {
         match abi {
-            Abi::C { .. } => {
-                if self.arch == "wasm32"
-                    && self.os == "unknown"
-                    && cx.wasm_c_abi_opt() == WasmCAbi::Legacy
-                {
-                    Abi::Wasm
-                } else {
-                    abi
-                }
-            }
-
             // On Windows, `extern "system"` behaves like msvc's `__stdcall`.
             // `__stdcall` only applies on x86 and on non-variadic functions:
             // https://learn.microsoft.com/en-us/cpp/cpp/stdcall?view=msvc-170
@@ -2676,7 +2662,6 @@ impl Target {
             Msp430Interrupt => self.arch == "msp430",
             RiscvInterruptM | RiscvInterruptS => ["riscv32", "riscv64"].contains(&&self.arch[..]),
             AvrInterrupt | AvrNonBlockingInterrupt => self.arch == "avr",
-            Wasm => ["wasm32", "wasm64"].contains(&&self.arch[..]),
             Thiscall { .. } => self.arch == "x86",
             // On windows these fall-back to platform native calling convention (C) when the
             // architecture is not supported.
diff --git a/compiler/rustc_trait_selection/src/error_reporting/mod.rs b/compiler/rustc_trait_selection/src/error_reporting/mod.rs
new file mode 100644
index 0000000000000..f6ac8fc7b614f
--- /dev/null
+++ b/compiler/rustc_trait_selection/src/error_reporting/mod.rs
@@ -0,0 +1 @@
+pub mod traits;
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/ambiguity.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/ambiguity.rs
new file mode 100644
index 0000000000000..c301deac6164d
--- /dev/null
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/ambiguity.rs
@@ -0,0 +1,698 @@
+use std::ops::ControlFlow;
+
+use rustc_errors::{
+    struct_span_code_err, Applicability, Diag, MultiSpan, StashKey, E0283, E0284, E0790,
+};
+use rustc_hir as hir;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::DefId;
+use rustc_hir::intravisit::Visitor as _;
+use rustc_hir::LangItem;
+use rustc_infer::infer::error_reporting::{TypeAnnotationNeeded, TypeErrCtxt};
+use rustc_infer::infer::{BoundRegionConversionTime, InferCtxt};
+use rustc_infer::traits::util::elaborate;
+use rustc_infer::traits::{
+    Obligation, ObligationCause, ObligationCauseCode, PolyTraitObligation, PredicateObligation,
+};
+use rustc_macros::extension;
+use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitable as _, TypeVisitableExt as _};
+use rustc_span::{ErrorGuaranteed, Span, DUMMY_SP};
+
+use crate::error_reporting::traits::suggestions::TypeErrCtxtExt as _;
+use crate::error_reporting::traits::{
+    to_pretty_impl_header, FindExprBySpan, InferCtxtPrivExt as _,
+};
+use crate::traits::query::evaluate_obligation::InferCtxtExt;
+use crate::traits::ObligationCtxt;
+
+#[derive(Debug)]
+pub enum CandidateSource {
+    DefId(DefId),
+    ParamEnv(Span),
+}
+
+pub fn compute_applicable_impls_for_diagnostics<'tcx>(
+    infcx: &InferCtxt<'tcx>,
+    obligation: &PolyTraitObligation<'tcx>,
+) -> Vec<CandidateSource> {
+    let tcx = infcx.tcx;
+    let param_env = obligation.param_env;
+
+    let predicate_polarity = obligation.predicate.skip_binder().polarity;
+
+    let impl_may_apply = |impl_def_id| {
+        let ocx = ObligationCtxt::new(infcx);
+        infcx.enter_forall(obligation.predicate, |placeholder_obligation| {
+            let obligation_trait_ref = ocx.normalize(
+                &ObligationCause::dummy(),
+                param_env,
+                placeholder_obligation.trait_ref,
+            );
+
+            let impl_args = infcx.fresh_args_for_item(DUMMY_SP, impl_def_id);
+            let impl_trait_ref =
+                tcx.impl_trait_ref(impl_def_id).unwrap().instantiate(tcx, impl_args);
+            let impl_trait_ref =
+                ocx.normalize(&ObligationCause::dummy(), param_env, impl_trait_ref);
+
+            if let Err(_) =
+                ocx.eq(&ObligationCause::dummy(), param_env, obligation_trait_ref, impl_trait_ref)
+            {
+                return false;
+            }
+
+            let impl_trait_header = tcx.impl_trait_header(impl_def_id).unwrap();
+            let impl_polarity = impl_trait_header.polarity;
+
+            match (impl_polarity, predicate_polarity) {
+                (ty::ImplPolarity::Positive, ty::PredicatePolarity::Positive)
+                | (ty::ImplPolarity::Negative, ty::PredicatePolarity::Negative) => {}
+                _ => return false,
+            }
+
+            let obligations = tcx
+                .predicates_of(impl_def_id)
+                .instantiate(tcx, impl_args)
+                .into_iter()
+                .map(|(predicate, _)| {
+                    Obligation::new(tcx, ObligationCause::dummy(), param_env, predicate)
+                })
+                // Kinda hacky, but let's just throw away obligations that overflow.
+                // This may reduce the accuracy of this check (if the obligation guides
+                // inference or it actually resulted in error after others are processed)
+                // ... but this is diagnostics code.
+                .filter(|obligation| {
+                    infcx.next_trait_solver() || infcx.evaluate_obligation(obligation).is_ok()
+                });
+            ocx.register_obligations(obligations);
+
+            ocx.select_where_possible().is_empty()
+        })
+    };
+
+    let param_env_candidate_may_apply = |poly_trait_predicate: ty::PolyTraitPredicate<'tcx>| {
+        let ocx = ObligationCtxt::new(infcx);
+        infcx.enter_forall(obligation.predicate, |placeholder_obligation| {
+            let obligation_trait_ref = ocx.normalize(
+                &ObligationCause::dummy(),
+                param_env,
+                placeholder_obligation.trait_ref,
+            );
+
+            let param_env_predicate = infcx.instantiate_binder_with_fresh_vars(
+                DUMMY_SP,
+                BoundRegionConversionTime::HigherRankedType,
+                poly_trait_predicate,
+            );
+            let param_env_trait_ref =
+                ocx.normalize(&ObligationCause::dummy(), param_env, param_env_predicate.trait_ref);
+
+            if let Err(_) = ocx.eq(
+                &ObligationCause::dummy(),
+                param_env,
+                obligation_trait_ref,
+                param_env_trait_ref,
+            ) {
+                return false;
+            }
+
+            ocx.select_where_possible().is_empty()
+        })
+    };
+
+    let mut ambiguities = Vec::new();
+
+    tcx.for_each_relevant_impl(
+        obligation.predicate.def_id(),
+        obligation.predicate.skip_binder().trait_ref.self_ty(),
+        |impl_def_id| {
+            if infcx.probe(|_| impl_may_apply(impl_def_id)) {
+                ambiguities.push(CandidateSource::DefId(impl_def_id))
+            }
+        },
+    );
+
+    let predicates =
+        tcx.predicates_of(obligation.cause.body_id.to_def_id()).instantiate_identity(tcx);
+    for (pred, span) in elaborate(tcx, predicates.into_iter()) {
+        let kind = pred.kind();
+        if let ty::ClauseKind::Trait(trait_pred) = kind.skip_binder()
+            && param_env_candidate_may_apply(kind.rebind(trait_pred))
+        {
+            if kind.rebind(trait_pred.trait_ref)
+                == ty::Binder::dummy(ty::TraitRef::identity(tcx, trait_pred.def_id()))
+            {
+                ambiguities.push(CandidateSource::ParamEnv(tcx.def_span(trait_pred.def_id())))
+            } else {
+                ambiguities.push(CandidateSource::ParamEnv(span))
+            }
+        }
+    }
+
+    ambiguities
+}
+
+#[extension(pub trait TypeErrCtxtAmbiguityExt<'a, 'tcx>)]
+impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
+    #[instrument(skip(self), level = "debug")]
+    fn maybe_report_ambiguity(&self, obligation: &PredicateObligation<'tcx>) -> ErrorGuaranteed {
+        // Unable to successfully determine, probably means
+        // insufficient type information, but could mean
+        // ambiguous impls. The latter *ought* to be a
+        // coherence violation, so we don't report it here.
+
+        let predicate = self.resolve_vars_if_possible(obligation.predicate);
+        let span = obligation.cause.span;
+
+        debug!(?predicate, obligation.cause.code = ?obligation.cause.code());
+
+        // Ambiguity errors are often caused as fallout from earlier errors.
+        // We ignore them if this `infcx` is tainted in some cases below.
+
+        let bound_predicate = predicate.kind();
+        let mut err = match bound_predicate.skip_binder() {
+            ty::PredicateKind::Clause(ty::ClauseKind::Trait(data)) => {
+                let trait_ref = bound_predicate.rebind(data.trait_ref);
+                debug!(?trait_ref);
+
+                if let Err(e) = predicate.error_reported() {
+                    return e;
+                }
+
+                if let Err(guar) = self.tcx.ensure().coherent_trait(trait_ref.def_id()) {
+                    // Avoid bogus "type annotations needed `Foo: Bar`" errors on `impl Bar for Foo` in case
+                    // other `Foo` impls are incoherent.
+                    return guar;
+                }
+
+                // This is kind of a hack: it frequently happens that some earlier
+                // error prevents types from being fully inferred, and then we get
+                // a bunch of uninteresting errors saying something like "<generic
+                // #0> doesn't implement Sized". It may even be true that we
+                // could just skip over all checks where the self-ty is an
+                // inference variable, but I was afraid that there might be an
+                // inference variable created, registered as an obligation, and
+                // then never forced by writeback, and hence by skipping here we'd
+                // be ignoring the fact that we don't KNOW the type works
+                // out. Though even that would probably be harmless, given that
+                // we're only talking about builtin traits, which are known to be
+                // inhabited. We used to check for `self.tcx.sess.has_errors()` to
+                // avoid inundating the user with unnecessary errors, but we now
+                // check upstream for type errors and don't add the obligations to
+                // begin with in those cases.
+                if self.tcx.is_lang_item(trait_ref.def_id(), LangItem::Sized) {
+                    match self.tainted_by_errors() {
+                        None => {
+                            let err = self.emit_inference_failure_err(
+                                obligation.cause.body_id,
+                                span,
+                                trait_ref.self_ty().skip_binder().into(),
+                                TypeAnnotationNeeded::E0282,
+                                false,
+                            );
+                            return err.stash(span, StashKey::MaybeForgetReturn).unwrap();
+                        }
+                        Some(e) => return e,
+                    }
+                }
+
+                // Typically, this ambiguity should only happen if
+                // there are unresolved type inference variables
+                // (otherwise it would suggest a coherence
+                // failure). But given #21974 that is not necessarily
+                // the case -- we can have multiple where clauses that
+                // are only distinguished by a region, which results
+                // in an ambiguity even when all types are fully
+                // known, since we don't dispatch based on region
+                // relationships.
+
+                // Pick the first generic parameter that still contains inference variables as the one
+                // we're going to emit an error for. If there are none (see above), fall back to
+                // a more general error.
+                let arg = data.trait_ref.args.iter().find(|s| s.has_non_region_infer());
+
+                let mut err = if let Some(arg) = arg {
+                    self.emit_inference_failure_err(
+                        obligation.cause.body_id,
+                        span,
+                        arg,
+                        TypeAnnotationNeeded::E0283,
+                        true,
+                    )
+                } else {
+                    struct_span_code_err!(
+                        self.dcx(),
+                        span,
+                        E0283,
+                        "type annotations needed: cannot satisfy `{}`",
+                        predicate,
+                    )
+                };
+
+                let mut ambiguities = compute_applicable_impls_for_diagnostics(
+                    self.infcx,
+                    &obligation.with(self.tcx, trait_ref),
+                );
+                let has_non_region_infer =
+                    trait_ref.skip_binder().args.types().any(|t| !t.is_ty_or_numeric_infer());
+                // It doesn't make sense to talk about applicable impls if there are more than a
+                // handful of them. If there are a lot of them, but only a few of them have no type
+                // params, we only show those, as they are more likely to be useful/intended.
+                if ambiguities.len() > 5 {
+                    let infcx = self.infcx;
+                    if !ambiguities.iter().all(|option| match option {
+                        CandidateSource::DefId(did) => infcx.tcx.generics_of(*did).count() == 0,
+                        CandidateSource::ParamEnv(_) => true,
+                    }) {
+                        // If not all are blanket impls, we filter blanked impls out.
+                        ambiguities.retain(|option| match option {
+                            CandidateSource::DefId(did) => infcx.tcx.generics_of(*did).count() == 0,
+                            CandidateSource::ParamEnv(_) => true,
+                        });
+                    }
+                }
+                if ambiguities.len() > 1 && ambiguities.len() < 10 && has_non_region_infer {
+                    if let Some(e) = self.tainted_by_errors()
+                        && arg.is_none()
+                    {
+                        // If `arg.is_none()`, then this is probably two param-env
+                        // candidates or impl candidates that are equal modulo lifetimes.
+                        // Therefore, if we've already emitted an error, just skip this
+                        // one, since it's not particularly actionable.
+                        err.cancel();
+                        return e;
+                    }
+                    self.annotate_source_of_ambiguity(&mut err, &ambiguities, predicate);
+                } else {
+                    if let Some(e) = self.tainted_by_errors() {
+                        err.cancel();
+                        return e;
+                    }
+                    err.note(format!("cannot satisfy `{predicate}`"));
+                    let impl_candidates =
+                        self.find_similar_impl_candidates(predicate.as_trait_clause().unwrap());
+                    if impl_candidates.len() < 40 {
+                        self.report_similar_impl_candidates(
+                            impl_candidates.as_slice(),
+                            trait_ref,
+                            obligation.cause.body_id,
+                            &mut err,
+                            false,
+                            obligation.param_env,
+                        );
+                    }
+                }
+
+                if let ObligationCauseCode::WhereClause(def_id, _)
+                | ObligationCauseCode::WhereClauseInExpr(def_id, ..) = *obligation.cause.code()
+                {
+                    self.suggest_fully_qualified_path(&mut err, def_id, span, trait_ref.def_id());
+                }
+
+                if let Some(ty::GenericArgKind::Type(_)) = arg.map(|arg| arg.unpack())
+                    && let Some(body) = self.tcx.hir().maybe_body_owned_by(obligation.cause.body_id)
+                {
+                    let mut expr_finder = FindExprBySpan::new(span, self.tcx);
+                    expr_finder.visit_expr(&body.value);
+
+                    if let Some(hir::Expr {
+                        kind:
+                            hir::ExprKind::Call(
+                                hir::Expr {
+                                    kind: hir::ExprKind::Path(hir::QPath::Resolved(None, path)),
+                                    ..
+                                },
+                                _,
+                            )
+                            | hir::ExprKind::Path(hir::QPath::Resolved(None, path)),
+                        ..
+                    }) = expr_finder.result
+                        && let [
+                            ..,
+                            trait_path_segment @ hir::PathSegment {
+                                res: Res::Def(DefKind::Trait, trait_id),
+                                ..
+                            },
+                            hir::PathSegment {
+                                ident: assoc_item_name,
+                                res: Res::Def(_, item_id),
+                                ..
+                            },
+                        ] = path.segments
+                        && data.trait_ref.def_id == *trait_id
+                        && self.tcx.trait_of_item(*item_id) == Some(*trait_id)
+                        && let None = self.tainted_by_errors()
+                    {
+                        let (verb, noun) = match self.tcx.associated_item(item_id).kind {
+                            ty::AssocKind::Const => ("refer to the", "constant"),
+                            ty::AssocKind::Fn => ("call", "function"),
+                            // This is already covered by E0223, but this following single match
+                            // arm doesn't hurt here.
+                            ty::AssocKind::Type => ("refer to the", "type"),
+                        };
+
+                        // Replace the more general E0283 with a more specific error
+                        err.cancel();
+                        err = self.dcx().struct_span_err(
+                            span,
+                            format!(
+                                "cannot {verb} associated {noun} on trait without specifying the \
+                                 corresponding `impl` type",
+                            ),
+                        );
+                        err.code(E0790);
+
+                        if let Some(local_def_id) = data.trait_ref.def_id.as_local()
+                            && let hir::Node::Item(hir::Item {
+                                ident: trait_name,
+                                kind: hir::ItemKind::Trait(_, _, _, _, trait_item_refs),
+                                ..
+                            }) = self.tcx.hir_node_by_def_id(local_def_id)
+                            && let Some(method_ref) = trait_item_refs
+                                .iter()
+                                .find(|item_ref| item_ref.ident == *assoc_item_name)
+                        {
+                            err.span_label(
+                                method_ref.span,
+                                format!("`{trait_name}::{assoc_item_name}` defined here"),
+                            );
+                        }
+
+                        err.span_label(span, format!("cannot {verb} associated {noun} of trait"));
+
+                        let trait_impls = self.tcx.trait_impls_of(data.trait_ref.def_id);
+
+                        if let Some(impl_def_id) =
+                            trait_impls.non_blanket_impls().values().flatten().next()
+                        {
+                            let non_blanket_impl_count =
+                                trait_impls.non_blanket_impls().values().flatten().count();
+                            // If there is only one implementation of the trait, suggest using it.
+                            // Otherwise, use a placeholder comment for the implementation.
+                            let (message, self_type) = if non_blanket_impl_count == 1 {
+                                (
+                                    "use the fully-qualified path to the only available \
+                                     implementation",
+                                    format!(
+                                        "{}",
+                                        self.tcx.type_of(impl_def_id).instantiate_identity()
+                                    ),
+                                )
+                            } else {
+                                (
+                                    "use a fully-qualified path to a specific available \
+                                     implementation",
+                                    "/* self type */".to_string(),
+                                )
+                            };
+                            let mut suggestions =
+                                vec![(path.span.shrink_to_lo(), format!("<{self_type} as "))];
+                            if let Some(generic_arg) = trait_path_segment.args {
+                                let between_span =
+                                    trait_path_segment.ident.span.between(generic_arg.span_ext);
+                                // get rid of :: between Trait and <type>
+                                // must be '::' between them, otherwise the parser won't accept the code
+                                suggestions.push((between_span, "".to_string()));
+                                suggestions
+                                    .push((generic_arg.span_ext.shrink_to_hi(), ">".to_string()));
+                            } else {
+                                suggestions.push((
+                                    trait_path_segment.ident.span.shrink_to_hi(),
+                                    ">".to_string(),
+                                ));
+                            }
+                            err.multipart_suggestion(
+                                message,
+                                suggestions,
+                                Applicability::MaybeIncorrect,
+                            );
+                        }
+                    }
+                };
+
+                err
+            }
+
+            ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(arg)) => {
+                // Same hacky approach as above to avoid deluging user
+                // with error messages.
+
+                if let Err(e) = arg.error_reported() {
+                    return e;
+                }
+                if let Some(e) = self.tainted_by_errors() {
+                    return e;
+                }
+
+                self.emit_inference_failure_err(
+                    obligation.cause.body_id,
+                    span,
+                    arg,
+                    TypeAnnotationNeeded::E0282,
+                    false,
+                )
+            }
+
+            ty::PredicateKind::Subtype(data) => {
+                if let Err(e) = data.error_reported() {
+                    return e;
+                }
+                if let Some(e) = self.tainted_by_errors() {
+                    return e;
+                }
+                let ty::SubtypePredicate { a_is_expected: _, a, b } = data;
+                // both must be type variables, or the other would've been instantiated
+                assert!(a.is_ty_var() && b.is_ty_var());
+                self.emit_inference_failure_err(
+                    obligation.cause.body_id,
+                    span,
+                    a.into(),
+                    TypeAnnotationNeeded::E0282,
+                    true,
+                )
+            }
+            ty::PredicateKind::Clause(ty::ClauseKind::Projection(data)) => {
+                if let Err(e) = predicate.error_reported() {
+                    return e;
+                }
+                if let Some(e) = self.tainted_by_errors() {
+                    return e;
+                }
+
+                if let Err(guar) =
+                    self.tcx.ensure().coherent_trait(self.tcx.parent(data.projection_term.def_id))
+                {
+                    // Avoid bogus "type annotations needed `Foo: Bar`" errors on `impl Bar for Foo` in case
+                    // other `Foo` impls are incoherent.
+                    return guar;
+                }
+                let arg = data
+                    .projection_term
+                    .args
+                    .iter()
+                    .chain(Some(data.term.into_arg()))
+                    .find(|g| g.has_non_region_infer());
+                if let Some(arg) = arg {
+                    self.emit_inference_failure_err(
+                        obligation.cause.body_id,
+                        span,
+                        arg,
+                        TypeAnnotationNeeded::E0284,
+                        true,
+                    )
+                    .with_note(format!("cannot satisfy `{predicate}`"))
+                } else {
+                    // If we can't find a generic parameter, just print a generic error
+                    struct_span_code_err!(
+                        self.dcx(),
+                        span,
+                        E0284,
+                        "type annotations needed: cannot satisfy `{}`",
+                        predicate,
+                    )
+                    .with_span_label(span, format!("cannot satisfy `{predicate}`"))
+                }
+            }
+
+            ty::PredicateKind::Clause(ty::ClauseKind::ConstEvaluatable(data)) => {
+                if let Err(e) = predicate.error_reported() {
+                    return e;
+                }
+                if let Some(e) = self.tainted_by_errors() {
+                    return e;
+                }
+                let arg = data.walk().find(|g| g.is_non_region_infer());
+                if let Some(arg) = arg {
+                    let err = self.emit_inference_failure_err(
+                        obligation.cause.body_id,
+                        span,
+                        arg,
+                        TypeAnnotationNeeded::E0284,
+                        true,
+                    );
+                    err
+                } else {
+                    // If we can't find a generic parameter, just print a generic error
+                    struct_span_code_err!(
+                        self.dcx(),
+                        span,
+                        E0284,
+                        "type annotations needed: cannot satisfy `{}`",
+                        predicate,
+                    )
+                    .with_span_label(span, format!("cannot satisfy `{predicate}`"))
+                }
+            }
+
+            ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(ct, ..)) => self
+                .emit_inference_failure_err(
+                    obligation.cause.body_id,
+                    span,
+                    ct.into(),
+                    TypeAnnotationNeeded::E0284,
+                    true,
+                ),
+            ty::PredicateKind::NormalizesTo(ty::NormalizesTo { alias, term })
+                if term.is_infer() =>
+            {
+                if let Some(e) = self.tainted_by_errors() {
+                    return e;
+                }
+                struct_span_code_err!(
+                    self.dcx(),
+                    span,
+                    E0284,
+                    "type annotations needed: cannot normalize `{alias}`",
+                )
+                .with_span_label(span, format!("cannot normalize `{alias}`"))
+            }
+
+            _ => {
+                if let Some(e) = self.tainted_by_errors() {
+                    return e;
+                }
+                struct_span_code_err!(
+                    self.dcx(),
+                    span,
+                    E0284,
+                    "type annotations needed: cannot satisfy `{}`",
+                    predicate,
+                )
+                .with_span_label(span, format!("cannot satisfy `{predicate}`"))
+            }
+        };
+        self.note_obligation_cause(&mut err, obligation);
+        err.emit()
+    }
+
+    fn annotate_source_of_ambiguity(
+        &self,
+        err: &mut Diag<'_>,
+        ambiguities: &[CandidateSource],
+        predicate: ty::Predicate<'tcx>,
+    ) {
+        let mut spans = vec![];
+        let mut crates = vec![];
+        let mut post = vec![];
+        let mut has_param_env = false;
+        for ambiguity in ambiguities {
+            match ambiguity {
+                CandidateSource::DefId(impl_def_id) => match self.tcx.span_of_impl(*impl_def_id) {
+                    Ok(span) => spans.push(span),
+                    Err(name) => {
+                        crates.push(name);
+                        if let Some(header) = to_pretty_impl_header(self.tcx, *impl_def_id) {
+                            post.push(header);
+                        }
+                    }
+                },
+                CandidateSource::ParamEnv(span) => {
+                    has_param_env = true;
+                    spans.push(*span);
+                }
+            }
+        }
+        let mut crate_names: Vec<_> = crates.iter().map(|n| format!("`{n}`")).collect();
+        crate_names.sort();
+        crate_names.dedup();
+        post.sort();
+        post.dedup();
+
+        if self.tainted_by_errors().is_some()
+            && (crate_names.len() == 1
+                && spans.len() == 0
+                && ["`core`", "`alloc`", "`std`"].contains(&crate_names[0].as_str())
+                || predicate.visit_with(&mut HasNumericInferVisitor).is_break())
+        {
+            // Avoid complaining about other inference issues for expressions like
+            // `42 >> 1`, where the types are still `{integer}`, but we want to
+            // Do we need `trait_ref.skip_binder().self_ty().is_numeric() &&` too?
+            // NOTE(eddyb) this was `.cancel()`, but `err`
+            // is borrowed, so we can't fully defuse it.
+            err.downgrade_to_delayed_bug();
+            return;
+        }
+
+        let msg = format!(
+            "multiple `impl`s{} satisfying `{}` found",
+            if has_param_env { " or `where` clauses" } else { "" },
+            predicate
+        );
+        let post = if post.len() > 1 || (post.len() == 1 && post[0].contains('\n')) {
+            format!(":\n{}", post.iter().map(|p| format!("- {p}")).collect::<Vec<_>>().join("\n"),)
+        } else if post.len() == 1 {
+            format!(": `{}`", post[0])
+        } else {
+            String::new()
+        };
+
+        match (spans.len(), crates.len(), crate_names.len()) {
+            (0, 0, 0) => {
+                err.note(format!("cannot satisfy `{predicate}`"));
+            }
+            (0, _, 1) => {
+                err.note(format!("{} in the `{}` crate{}", msg, crates[0], post,));
+            }
+            (0, _, _) => {
+                err.note(format!(
+                    "{} in the following crates: {}{}",
+                    msg,
+                    crate_names.join(", "),
+                    post,
+                ));
+            }
+            (_, 0, 0) => {
+                let span: MultiSpan = spans.into();
+                err.span_note(span, msg);
+            }
+            (_, 1, 1) => {
+                let span: MultiSpan = spans.into();
+                err.span_note(span, msg);
+                err.note(format!("and another `impl` found in the `{}` crate{}", crates[0], post,));
+            }
+            _ => {
+                let span: MultiSpan = spans.into();
+                err.span_note(span, msg);
+                err.note(format!(
+                    "and more `impl`s found in the following crates: {}{}",
+                    crate_names.join(", "),
+                    post,
+                ));
+            }
+        }
+    }
+}
+
+struct HasNumericInferVisitor;
+
+impl<'tcx> ty::TypeVisitor<TyCtxt<'tcx>> for HasNumericInferVisitor {
+    type Result = ControlFlow<()>;
+
+    fn visit_ty(&mut self, ty: Ty<'tcx>) -> Self::Result {
+        if matches!(ty.kind(), ty::Infer(ty::FloatVar(_) | ty::IntVar(_))) {
+            ControlFlow::Break(())
+        } else {
+            ControlFlow::Continue(())
+        }
+    }
+}
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
similarity index 72%
rename from compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
rename to compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
index 5461f9e65affe..2e6247b46401d 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
@@ -1,34 +1,30 @@
-// ignore-tidy-filelength :(
-
 use super::on_unimplemented::{AppendConstMessage, OnUnimplementedNote, TypeErrCtxtExt as _};
 use super::suggestions::{get_explanation_based_on_obligation, TypeErrCtxtExt as _};
+use crate::error_reporting::traits::infer_ctxt_ext::InferCtxtExt;
 use crate::errors::{
     AsyncClosureNotFn, ClosureFnMutLabel, ClosureFnOnceLabel, ClosureKindMismatch,
 };
-use crate::infer::error_reporting::{TyCategory, TypeAnnotationNeeded as ErrorCode};
+use crate::infer::error_reporting::TyCategory;
 use crate::infer::InferCtxtExt as _;
 use crate::infer::{self, InferCtxt};
-use crate::traits::error_reporting::infer_ctxt_ext::InferCtxtExt;
-use crate::traits::error_reporting::{ambiguity, ambiguity::CandidateSource::*};
 use crate::traits::query::evaluate_obligation::InferCtxtExt as _;
-use crate::traits::specialize::to_pretty_impl_header;
 use crate::traits::NormalizeExt;
 use crate::traits::{
-    elaborate, FulfillmentError, FulfillmentErrorCode, MismatchedProjectionTypes, Obligation,
-    ObligationCause, ObligationCauseCode, ObligationCtxt, Overflow, PredicateObligation,
-    SelectionError, SignatureMismatch, TraitNotObjectSafe,
+    elaborate, MismatchedProjectionTypes, Obligation, ObligationCause, ObligationCauseCode,
+    ObligationCtxt, Overflow, PredicateObligation, SelectionError, SignatureMismatch,
+    TraitNotObjectSafe,
 };
 use core::ops::ControlFlow;
-use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
+use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::codes::*;
-use rustc_errors::{pluralize, struct_span_code_err, Applicability, MultiSpan, StringPart};
-use rustc_errors::{Diag, EmissionGuarantee, ErrorGuaranteed, FatalError, StashKey};
-use rustc_hir::def::{DefKind, Namespace, Res};
+use rustc_errors::{pluralize, struct_span_code_err, Applicability, StringPart};
+use rustc_errors::{Diag, ErrorGuaranteed, StashKey};
+use rustc_hir::def::Namespace;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::Visitor;
+use rustc_hir::Node;
 use rustc_hir::{self as hir, LangItem};
-use rustc_hir::{GenericParam, Item, Node};
 use rustc_infer::infer::error_reporting::TypeErrCtxt;
 use rustc_infer::infer::{InferOk, TypeTrace};
 use rustc_macros::extension;
@@ -42,323 +38,21 @@ use rustc_middle::ty::print::{
     PrintTraitRefExt as _,
 };
 use rustc_middle::ty::{
-    self, SubtypePredicate, ToPolyTraitRef, TraitRef, Ty, TyCtxt, TypeFoldable, TypeVisitable,
-    TypeVisitableExt, Upcast,
+    self, ToPolyTraitRef, TraitRef, Ty, TyCtxt, TypeFoldable, TypeVisitableExt, Upcast,
 };
 use rustc_middle::{bug, span_bug};
-use rustc_session::Limit;
-use rustc_span::def_id::LOCAL_CRATE;
 use rustc_span::symbol::sym;
-use rustc_span::{BytePos, ExpnKind, Span, Symbol, DUMMY_SP};
+use rustc_span::{BytePos, Span, Symbol, DUMMY_SP};
 use std::borrow::Cow;
-use std::fmt;
-use std::iter;
 
 use super::{
-    ArgKind, CandidateSimilarity, FindExprBySpan, FindTypeParam, GetSafeTransmuteErrorAndReason,
-    HasNumericInferVisitor, ImplCandidate, UnsatisfiedConst,
+    ArgKind, CandidateSimilarity, GetSafeTransmuteErrorAndReason, ImplCandidate, UnsatisfiedConst,
 };
 
 pub use rustc_infer::traits::error_reporting::*;
 
-pub enum OverflowCause<'tcx> {
-    DeeplyNormalize(ty::AliasTerm<'tcx>),
-    TraitSolver(ty::Predicate<'tcx>),
-}
-
-pub fn suggest_new_overflow_limit<'tcx, G: EmissionGuarantee>(
-    tcx: TyCtxt<'tcx>,
-    err: &mut Diag<'_, G>,
-) {
-    let suggested_limit = match tcx.recursion_limit() {
-        Limit(0) => Limit(2),
-        limit => limit * 2,
-    };
-    err.help(format!(
-        "consider increasing the recursion limit by adding a \
-         `#![recursion_limit = \"{}\"]` attribute to your crate (`{}`)",
-        suggested_limit,
-        tcx.crate_name(LOCAL_CRATE),
-    ));
-}
-
-#[extension(pub trait TypeErrCtxtExt<'a, 'tcx>)]
+#[extension(pub trait TypeErrCtxtSelectionErrExt<'a, 'tcx>)]
 impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
-    fn report_fulfillment_errors(
-        &self,
-        mut errors: Vec<FulfillmentError<'tcx>>,
-    ) -> ErrorGuaranteed {
-        self.sub_relations
-            .borrow_mut()
-            .add_constraints(self, errors.iter().map(|e| e.obligation.predicate));
-
-        #[derive(Debug)]
-        struct ErrorDescriptor<'tcx> {
-            predicate: ty::Predicate<'tcx>,
-            index: Option<usize>, // None if this is an old error
-        }
-
-        let mut error_map: FxIndexMap<_, Vec<_>> = self
-            .reported_trait_errors
-            .borrow()
-            .iter()
-            .map(|(&span, predicates)| {
-                (
-                    span,
-                    predicates
-                        .0
-                        .iter()
-                        .map(|&predicate| ErrorDescriptor { predicate, index: None })
-                        .collect(),
-                )
-            })
-            .collect();
-
-        // Ensure `T: Sized` and `T: WF` obligations come last. This lets us display diagnostics
-        // with more relevant type information and hide redundant E0282 errors.
-        errors.sort_by_key(|e| match e.obligation.predicate.kind().skip_binder() {
-            ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred))
-                if self.tcx.is_lang_item(pred.def_id(), LangItem::Sized) =>
-            {
-                1
-            }
-            ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(_)) => 3,
-            ty::PredicateKind::Coerce(_) => 2,
-            _ => 0,
-        });
-
-        for (index, error) in errors.iter().enumerate() {
-            // We want to ignore desugarings here: spans are equivalent even
-            // if one is the result of a desugaring and the other is not.
-            let mut span = error.obligation.cause.span;
-            let expn_data = span.ctxt().outer_expn_data();
-            if let ExpnKind::Desugaring(_) = expn_data.kind {
-                span = expn_data.call_site;
-            }
-
-            error_map.entry(span).or_default().push(ErrorDescriptor {
-                predicate: error.obligation.predicate,
-                index: Some(index),
-            });
-        }
-
-        // We do this in 2 passes because we want to display errors in order, though
-        // maybe it *is* better to sort errors by span or something.
-        let mut is_suppressed = vec![false; errors.len()];
-        for (_, error_set) in error_map.iter() {
-            // We want to suppress "duplicate" errors with the same span.
-            for error in error_set {
-                if let Some(index) = error.index {
-                    // Suppress errors that are either:
-                    // 1) strictly implied by another error.
-                    // 2) implied by an error with a smaller index.
-                    for error2 in error_set {
-                        if error2.index.is_some_and(|index2| is_suppressed[index2]) {
-                            // Avoid errors being suppressed by already-suppressed
-                            // errors, to prevent all errors from being suppressed
-                            // at once.
-                            continue;
-                        }
-
-                        if self.error_implies(error2.predicate, error.predicate)
-                            && !(error2.index >= error.index
-                                && self.error_implies(error.predicate, error2.predicate))
-                        {
-                            info!("skipping {:?} (implied by {:?})", error, error2);
-                            is_suppressed[index] = true;
-                            break;
-                        }
-                    }
-                }
-            }
-        }
-
-        let mut reported = None;
-
-        for from_expansion in [false, true] {
-            for (error, suppressed) in iter::zip(&errors, &is_suppressed) {
-                if !suppressed && error.obligation.cause.span.from_expansion() == from_expansion {
-                    let guar = self.report_fulfillment_error(error);
-                    self.infcx.set_tainted_by_errors(guar);
-                    reported = Some(guar);
-                    // We want to ignore desugarings here: spans are equivalent even
-                    // if one is the result of a desugaring and the other is not.
-                    let mut span = error.obligation.cause.span;
-                    let expn_data = span.ctxt().outer_expn_data();
-                    if let ExpnKind::Desugaring(_) = expn_data.kind {
-                        span = expn_data.call_site;
-                    }
-                    self.reported_trait_errors
-                        .borrow_mut()
-                        .entry(span)
-                        .or_insert_with(|| (vec![], guar))
-                        .0
-                        .push(error.obligation.predicate);
-                }
-            }
-        }
-
-        // It could be that we don't report an error because we have seen an `ErrorReported` from
-        // another source. We should probably be able to fix most of these, but some are delayed
-        // bugs that get a proper error after this function.
-        reported.unwrap_or_else(|| self.dcx().delayed_bug("failed to report fulfillment errors"))
-    }
-
-    /// Reports that an overflow has occurred and halts compilation. We
-    /// halt compilation unconditionally because it is important that
-    /// overflows never be masked -- they basically represent computations
-    /// whose result could not be truly determined and thus we can't say
-    /// if the program type checks or not -- and they are unusual
-    /// occurrences in any case.
-    fn report_overflow_error(
-        &self,
-        cause: OverflowCause<'tcx>,
-        span: Span,
-        suggest_increasing_limit: bool,
-        mutate: impl FnOnce(&mut Diag<'_>),
-    ) -> ! {
-        let mut err = self.build_overflow_error(cause, span, suggest_increasing_limit);
-        mutate(&mut err);
-        err.emit();
-        FatalError.raise();
-    }
-
-    fn build_overflow_error(
-        &self,
-        cause: OverflowCause<'tcx>,
-        span: Span,
-        suggest_increasing_limit: bool,
-    ) -> Diag<'a> {
-        fn with_short_path<'tcx, T>(tcx: TyCtxt<'tcx>, value: T) -> String
-        where
-            T: fmt::Display + Print<'tcx, FmtPrinter<'tcx, 'tcx>>,
-        {
-            let s = value.to_string();
-            if s.len() > 50 {
-                // We don't need to save the type to a file, we will be talking about this type already
-                // in a separate note when we explain the obligation, so it will be available that way.
-                let mut cx: FmtPrinter<'_, '_> =
-                    FmtPrinter::new_with_limit(tcx, Namespace::TypeNS, rustc_session::Limit(6));
-                value.print(&mut cx).unwrap();
-                cx.into_buffer()
-            } else {
-                s
-            }
-        }
-
-        let mut err = match cause {
-            OverflowCause::DeeplyNormalize(alias_term) => {
-                let alias_term = self.resolve_vars_if_possible(alias_term);
-                let kind = alias_term.kind(self.tcx).descr();
-                let alias_str = with_short_path(self.tcx, alias_term);
-                struct_span_code_err!(
-                    self.dcx(),
-                    span,
-                    E0275,
-                    "overflow normalizing the {kind} `{alias_str}`",
-                )
-            }
-            OverflowCause::TraitSolver(predicate) => {
-                let predicate = self.resolve_vars_if_possible(predicate);
-                match predicate.kind().skip_binder() {
-                    ty::PredicateKind::Subtype(ty::SubtypePredicate { a, b, a_is_expected: _ })
-                    | ty::PredicateKind::Coerce(ty::CoercePredicate { a, b }) => {
-                        struct_span_code_err!(
-                            self.dcx(),
-                            span,
-                            E0275,
-                            "overflow assigning `{a}` to `{b}`",
-                        )
-                    }
-                    _ => {
-                        let pred_str = with_short_path(self.tcx, predicate);
-                        struct_span_code_err!(
-                            self.dcx(),
-                            span,
-                            E0275,
-                            "overflow evaluating the requirement `{pred_str}`",
-                        )
-                    }
-                }
-            }
-        };
-
-        if suggest_increasing_limit {
-            suggest_new_overflow_limit(self.tcx, &mut err);
-        }
-
-        err
-    }
-
-    /// Reports that an overflow has occurred and halts compilation. We
-    /// halt compilation unconditionally because it is important that
-    /// overflows never be masked -- they basically represent computations
-    /// whose result could not be truly determined and thus we can't say
-    /// if the program type checks or not -- and they are unusual
-    /// occurrences in any case.
-    fn report_overflow_obligation<T>(
-        &self,
-        obligation: &Obligation<'tcx, T>,
-        suggest_increasing_limit: bool,
-    ) -> !
-    where
-        T: Upcast<TyCtxt<'tcx>, ty::Predicate<'tcx>> + Clone,
-    {
-        let predicate = obligation.predicate.clone().upcast(self.tcx);
-        let predicate = self.resolve_vars_if_possible(predicate);
-        self.report_overflow_error(
-            OverflowCause::TraitSolver(predicate),
-            obligation.cause.span,
-            suggest_increasing_limit,
-            |err| {
-                self.note_obligation_cause_code(
-                    obligation.cause.body_id,
-                    err,
-                    predicate,
-                    obligation.param_env,
-                    obligation.cause.code(),
-                    &mut vec![],
-                    &mut Default::default(),
-                );
-            },
-        );
-    }
-
-    /// Reports that a cycle was detected which led to overflow and halts
-    /// compilation. This is equivalent to `report_overflow_obligation` except
-    /// that we can give a more helpful error message (and, in particular,
-    /// we do not suggest increasing the overflow limit, which is not
-    /// going to help).
-    fn report_overflow_obligation_cycle(&self, cycle: &[PredicateObligation<'tcx>]) -> ! {
-        let cycle = self.resolve_vars_if_possible(cycle.to_owned());
-        assert!(!cycle.is_empty());
-
-        debug!(?cycle, "report_overflow_error_cycle");
-
-        // The 'deepest' obligation is most likely to have a useful
-        // cause 'backtrace'
-        self.report_overflow_obligation(
-            cycle.iter().max_by_key(|p| p.recursion_depth).unwrap(),
-            false,
-        );
-    }
-
-    fn report_overflow_no_abort(
-        &self,
-        obligation: PredicateObligation<'tcx>,
-        suggest_increasing_limit: bool,
-    ) -> ErrorGuaranteed {
-        let obligation = self.resolve_vars_if_possible(obligation);
-        let mut err = self.build_overflow_error(
-            OverflowCause::TraitSolver(obligation.predicate),
-            obligation.cause.span,
-            suggest_increasing_limit,
-        );
-        self.note_obligation_cause(&mut err, &obligation);
-        self.point_at_returns_when_relevant(&mut err, &obligation);
-        err.emit()
-    }
-
     /// The `root_obligation` parameter should be the `root_obligation` field
     /// from a `FulfillmentError`. If no `FulfillmentError` is available,
     /// then it should be the same as `obligation`.
@@ -986,7 +680,10 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         self.point_at_returns_when_relevant(&mut err, &obligation);
         err.emit()
     }
+}
 
+#[extension(pub(super) trait TypeErrCtxtExt<'a, 'tcx>)]
+impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
     fn apply_do_not_recommend(&self, obligation: &mut PredicateObligation<'tcx>) -> bool {
         let mut base_cause = obligation.cause.code().clone();
         let mut applied_do_not_recommend = false;
@@ -1134,7 +831,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
     }
 
     /// When the `E` of the resulting `Result<T, E>` in an expression `foo().bar().baz()?`,
-    /// identify thoe method chain sub-expressions that could or could not have been annotated
+    /// identify those method chain sub-expressions that could or could not have been annotated
     /// with `?`.
     fn try_conversion_context(
         &self,
@@ -1507,72 +1204,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         }
     }
 
-    #[instrument(skip(self), level = "debug")]
-    fn report_fulfillment_error(&self, error: &FulfillmentError<'tcx>) -> ErrorGuaranteed {
-        let mut error = FulfillmentError {
-            obligation: error.obligation.clone(),
-            code: error.code.clone(),
-            root_obligation: error.root_obligation.clone(),
-        };
-        if matches!(
-            error.code,
-            FulfillmentErrorCode::Select(crate::traits::SelectionError::Unimplemented)
-                | FulfillmentErrorCode::Project(_)
-        ) && self.apply_do_not_recommend(&mut error.obligation)
-        {
-            error.code = FulfillmentErrorCode::Select(SelectionError::Unimplemented);
-        }
-
-        match error.code {
-            FulfillmentErrorCode::Select(ref selection_error) => self.report_selection_error(
-                error.obligation.clone(),
-                &error.root_obligation,
-                selection_error,
-            ),
-            FulfillmentErrorCode::Project(ref e) => {
-                self.report_projection_error(&error.obligation, e)
-            }
-            FulfillmentErrorCode::Ambiguity { overflow: None } => {
-                self.maybe_report_ambiguity(&error.obligation)
-            }
-            FulfillmentErrorCode::Ambiguity { overflow: Some(suggest_increasing_limit) } => {
-                self.report_overflow_no_abort(error.obligation.clone(), suggest_increasing_limit)
-            }
-            FulfillmentErrorCode::Subtype(ref expected_found, ref err) => self
-                .report_mismatched_types(
-                    &error.obligation.cause,
-                    expected_found.expected,
-                    expected_found.found,
-                    *err,
-                )
-                .emit(),
-            FulfillmentErrorCode::ConstEquate(ref expected_found, ref err) => {
-                let mut diag = self.report_mismatched_consts(
-                    &error.obligation.cause,
-                    expected_found.expected,
-                    expected_found.found,
-                    *err,
-                );
-                let code = error.obligation.cause.code().peel_derives().peel_match_impls();
-                if let ObligationCauseCode::WhereClause(..)
-                | ObligationCauseCode::WhereClauseInExpr(..) = code
-                {
-                    self.note_obligation_cause_code(
-                        error.obligation.cause.body_id,
-                        &mut diag,
-                        error.obligation.predicate,
-                        error.obligation.param_env,
-                        code,
-                        &mut vec![],
-                        &mut Default::default(),
-                    );
-                }
-                diag.emit()
-            }
-            FulfillmentErrorCode::Cycle(ref cycle) => self.report_overflow_obligation_cycle(cycle),
-        }
-    }
-
     #[instrument(level = "debug", skip_all)]
     fn report_projection_error(
         &self,
@@ -2145,6 +1776,19 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             true
         };
 
+        // we filter before checking if `impl_candidates` is empty
+        // to get the fallback solution if we filtered out any impls
+        let impl_candidates = impl_candidates
+            .into_iter()
+            .cloned()
+            .filter(|cand| {
+                !self.tcx.has_attrs_with_path(
+                    cand.impl_def_id,
+                    &[sym::diagnostic, sym::do_not_recommend],
+                )
+            })
+            .collect::<Vec<_>>();
+
         let def_id = trait_ref.def_id();
         if impl_candidates.is_empty() {
             if self.tcx.trait_is_auto(def_id)
@@ -2157,6 +1801,12 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             let mut impl_candidates: Vec<_> = self
                 .tcx
                 .all_impls(def_id)
+                // ignore `do_not_recommend` items
+                .filter(|def_id| {
+                    !self
+                        .tcx
+                        .has_attrs_with_path(*def_id, &[sym::diagnostic, sym::do_not_recommend])
+                })
                 // Ignore automatically derived impls and `!Trait` impls.
                 .filter_map(|def_id| self.tcx.impl_trait_header(def_id))
                 .filter_map(|header| {
@@ -2350,536 +2000,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         Obligation::new(self.tcx, ObligationCause::dummy(), param_env, trait_pred)
     }
 
-    #[instrument(skip(self), level = "debug")]
-    fn maybe_report_ambiguity(&self, obligation: &PredicateObligation<'tcx>) -> ErrorGuaranteed {
-        // Unable to successfully determine, probably means
-        // insufficient type information, but could mean
-        // ambiguous impls. The latter *ought* to be a
-        // coherence violation, so we don't report it here.
-
-        let predicate = self.resolve_vars_if_possible(obligation.predicate);
-        let span = obligation.cause.span;
-
-        debug!(?predicate, obligation.cause.code = ?obligation.cause.code());
-
-        // Ambiguity errors are often caused as fallout from earlier errors.
-        // We ignore them if this `infcx` is tainted in some cases below.
-
-        let bound_predicate = predicate.kind();
-        let mut err = match bound_predicate.skip_binder() {
-            ty::PredicateKind::Clause(ty::ClauseKind::Trait(data)) => {
-                let trait_ref = bound_predicate.rebind(data.trait_ref);
-                debug!(?trait_ref);
-
-                if let Err(e) = predicate.error_reported() {
-                    return e;
-                }
-
-                if let Err(guar) = self.tcx.ensure().coherent_trait(trait_ref.def_id()) {
-                    // Avoid bogus "type annotations needed `Foo: Bar`" errors on `impl Bar for Foo` in case
-                    // other `Foo` impls are incoherent.
-                    return guar;
-                }
-
-                // This is kind of a hack: it frequently happens that some earlier
-                // error prevents types from being fully inferred, and then we get
-                // a bunch of uninteresting errors saying something like "<generic
-                // #0> doesn't implement Sized". It may even be true that we
-                // could just skip over all checks where the self-ty is an
-                // inference variable, but I was afraid that there might be an
-                // inference variable created, registered as an obligation, and
-                // then never forced by writeback, and hence by skipping here we'd
-                // be ignoring the fact that we don't KNOW the type works
-                // out. Though even that would probably be harmless, given that
-                // we're only talking about builtin traits, which are known to be
-                // inhabited. We used to check for `self.tcx.sess.has_errors()` to
-                // avoid inundating the user with unnecessary errors, but we now
-                // check upstream for type errors and don't add the obligations to
-                // begin with in those cases.
-                if self.tcx.is_lang_item(trait_ref.def_id(), LangItem::Sized) {
-                    match self.tainted_by_errors() {
-                        None => {
-                            let err = self.emit_inference_failure_err(
-                                obligation.cause.body_id,
-                                span,
-                                trait_ref.self_ty().skip_binder().into(),
-                                ErrorCode::E0282,
-                                false,
-                            );
-                            return err.stash(span, StashKey::MaybeForgetReturn).unwrap();
-                        }
-                        Some(e) => return e,
-                    }
-                }
-
-                // Typically, this ambiguity should only happen if
-                // there are unresolved type inference variables
-                // (otherwise it would suggest a coherence
-                // failure). But given #21974 that is not necessarily
-                // the case -- we can have multiple where clauses that
-                // are only distinguished by a region, which results
-                // in an ambiguity even when all types are fully
-                // known, since we don't dispatch based on region
-                // relationships.
-
-                // Pick the first generic parameter that still contains inference variables as the one
-                // we're going to emit an error for. If there are none (see above), fall back to
-                // a more general error.
-                let arg = data.trait_ref.args.iter().find(|s| s.has_non_region_infer());
-
-                let mut err = if let Some(arg) = arg {
-                    self.emit_inference_failure_err(
-                        obligation.cause.body_id,
-                        span,
-                        arg,
-                        ErrorCode::E0283,
-                        true,
-                    )
-                } else {
-                    struct_span_code_err!(
-                        self.dcx(),
-                        span,
-                        E0283,
-                        "type annotations needed: cannot satisfy `{}`",
-                        predicate,
-                    )
-                };
-
-                let mut ambiguities = ambiguity::compute_applicable_impls_for_diagnostics(
-                    self.infcx,
-                    &obligation.with(self.tcx, trait_ref),
-                );
-                let has_non_region_infer =
-                    trait_ref.skip_binder().args.types().any(|t| !t.is_ty_or_numeric_infer());
-                // It doesn't make sense to talk about applicable impls if there are more than a
-                // handful of them. If there are a lot of them, but only a few of them have no type
-                // params, we only show those, as they are more likely to be useful/intended.
-                if ambiguities.len() > 5 {
-                    let infcx = self.infcx;
-                    if !ambiguities.iter().all(|option| match option {
-                        DefId(did) => infcx.tcx.generics_of(*did).count() == 0,
-                        ParamEnv(_) => true,
-                    }) {
-                        // If not all are blanket impls, we filter blanked impls out.
-                        ambiguities.retain(|option| match option {
-                            DefId(did) => infcx.tcx.generics_of(*did).count() == 0,
-                            ParamEnv(_) => true,
-                        });
-                    }
-                }
-                if ambiguities.len() > 1 && ambiguities.len() < 10 && has_non_region_infer {
-                    if let Some(e) = self.tainted_by_errors()
-                        && arg.is_none()
-                    {
-                        // If `arg.is_none()`, then this is probably two param-env
-                        // candidates or impl candidates that are equal modulo lifetimes.
-                        // Therefore, if we've already emitted an error, just skip this
-                        // one, since it's not particularly actionable.
-                        err.cancel();
-                        return e;
-                    }
-                    self.annotate_source_of_ambiguity(&mut err, &ambiguities, predicate);
-                } else {
-                    if let Some(e) = self.tainted_by_errors() {
-                        err.cancel();
-                        return e;
-                    }
-                    err.note(format!("cannot satisfy `{predicate}`"));
-                    let impl_candidates =
-                        self.find_similar_impl_candidates(predicate.as_trait_clause().unwrap());
-                    if impl_candidates.len() < 40 {
-                        self.report_similar_impl_candidates(
-                            impl_candidates.as_slice(),
-                            trait_ref,
-                            obligation.cause.body_id,
-                            &mut err,
-                            false,
-                            obligation.param_env,
-                        );
-                    }
-                }
-
-                if let ObligationCauseCode::WhereClause(def_id, _)
-                | ObligationCauseCode::WhereClauseInExpr(def_id, ..) = *obligation.cause.code()
-                {
-                    self.suggest_fully_qualified_path(&mut err, def_id, span, trait_ref.def_id());
-                }
-
-                if let Some(ty::GenericArgKind::Type(_)) = arg.map(|arg| arg.unpack())
-                    && let Some(body) = self.tcx.hir().maybe_body_owned_by(obligation.cause.body_id)
-                {
-                    let mut expr_finder = FindExprBySpan::new(span, self.tcx);
-                    expr_finder.visit_expr(&body.value);
-
-                    if let Some(hir::Expr {
-                        kind:
-                            hir::ExprKind::Call(
-                                hir::Expr {
-                                    kind: hir::ExprKind::Path(hir::QPath::Resolved(None, path)),
-                                    ..
-                                },
-                                _,
-                            )
-                            | hir::ExprKind::Path(hir::QPath::Resolved(None, path)),
-                        ..
-                    }) = expr_finder.result
-                        && let [
-                            ..,
-                            trait_path_segment @ hir::PathSegment {
-                                res: Res::Def(DefKind::Trait, trait_id),
-                                ..
-                            },
-                            hir::PathSegment {
-                                ident: assoc_item_name,
-                                res: Res::Def(_, item_id),
-                                ..
-                            },
-                        ] = path.segments
-                        && data.trait_ref.def_id == *trait_id
-                        && self.tcx.trait_of_item(*item_id) == Some(*trait_id)
-                        && let None = self.tainted_by_errors()
-                    {
-                        let (verb, noun) = match self.tcx.associated_item(item_id).kind {
-                            ty::AssocKind::Const => ("refer to the", "constant"),
-                            ty::AssocKind::Fn => ("call", "function"),
-                            // This is already covered by E0223, but this following single match
-                            // arm doesn't hurt here.
-                            ty::AssocKind::Type => ("refer to the", "type"),
-                        };
-
-                        // Replace the more general E0283 with a more specific error
-                        err.cancel();
-                        err = self.dcx().struct_span_err(
-                            span,
-                            format!(
-                                "cannot {verb} associated {noun} on trait without specifying the \
-                                 corresponding `impl` type",
-                            ),
-                        );
-                        err.code(E0790);
-
-                        if let Some(local_def_id) = data.trait_ref.def_id.as_local()
-                            && let hir::Node::Item(hir::Item {
-                                ident: trait_name,
-                                kind: hir::ItemKind::Trait(_, _, _, _, trait_item_refs),
-                                ..
-                            }) = self.tcx.hir_node_by_def_id(local_def_id)
-                            && let Some(method_ref) = trait_item_refs
-                                .iter()
-                                .find(|item_ref| item_ref.ident == *assoc_item_name)
-                        {
-                            err.span_label(
-                                method_ref.span,
-                                format!("`{trait_name}::{assoc_item_name}` defined here"),
-                            );
-                        }
-
-                        err.span_label(span, format!("cannot {verb} associated {noun} of trait"));
-
-                        let trait_impls = self.tcx.trait_impls_of(data.trait_ref.def_id);
-
-                        if let Some(impl_def_id) =
-                            trait_impls.non_blanket_impls().values().flatten().next()
-                        {
-                            let non_blanket_impl_count =
-                                trait_impls.non_blanket_impls().values().flatten().count();
-                            // If there is only one implementation of the trait, suggest using it.
-                            // Otherwise, use a placeholder comment for the implementation.
-                            let (message, self_type) = if non_blanket_impl_count == 1 {
-                                (
-                                    "use the fully-qualified path to the only available \
-                                     implementation",
-                                    format!(
-                                        "{}",
-                                        self.tcx.type_of(impl_def_id).instantiate_identity()
-                                    ),
-                                )
-                            } else {
-                                (
-                                    "use a fully-qualified path to a specific available \
-                                     implementation",
-                                    "/* self type */".to_string(),
-                                )
-                            };
-                            let mut suggestions =
-                                vec![(path.span.shrink_to_lo(), format!("<{self_type} as "))];
-                            if let Some(generic_arg) = trait_path_segment.args {
-                                let between_span =
-                                    trait_path_segment.ident.span.between(generic_arg.span_ext);
-                                // get rid of :: between Trait and <type>
-                                // must be '::' between them, otherwise the parser won't accept the code
-                                suggestions.push((between_span, "".to_string()));
-                                suggestions
-                                    .push((generic_arg.span_ext.shrink_to_hi(), ">".to_string()));
-                            } else {
-                                suggestions.push((
-                                    trait_path_segment.ident.span.shrink_to_hi(),
-                                    ">".to_string(),
-                                ));
-                            }
-                            err.multipart_suggestion(
-                                message,
-                                suggestions,
-                                Applicability::MaybeIncorrect,
-                            );
-                        }
-                    }
-                };
-
-                err
-            }
-
-            ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(arg)) => {
-                // Same hacky approach as above to avoid deluging user
-                // with error messages.
-
-                if let Err(e) = arg.error_reported() {
-                    return e;
-                }
-                if let Some(e) = self.tainted_by_errors() {
-                    return e;
-                }
-
-                self.emit_inference_failure_err(
-                    obligation.cause.body_id,
-                    span,
-                    arg,
-                    ErrorCode::E0282,
-                    false,
-                )
-            }
-
-            ty::PredicateKind::Subtype(data) => {
-                if let Err(e) = data.error_reported() {
-                    return e;
-                }
-                if let Some(e) = self.tainted_by_errors() {
-                    return e;
-                }
-                let SubtypePredicate { a_is_expected: _, a, b } = data;
-                // both must be type variables, or the other would've been instantiated
-                assert!(a.is_ty_var() && b.is_ty_var());
-                self.emit_inference_failure_err(
-                    obligation.cause.body_id,
-                    span,
-                    a.into(),
-                    ErrorCode::E0282,
-                    true,
-                )
-            }
-            ty::PredicateKind::Clause(ty::ClauseKind::Projection(data)) => {
-                if let Err(e) = predicate.error_reported() {
-                    return e;
-                }
-                if let Some(e) = self.tainted_by_errors() {
-                    return e;
-                }
-
-                if let Err(guar) =
-                    self.tcx.ensure().coherent_trait(self.tcx.parent(data.projection_term.def_id))
-                {
-                    // Avoid bogus "type annotations needed `Foo: Bar`" errors on `impl Bar for Foo` in case
-                    // other `Foo` impls are incoherent.
-                    return guar;
-                }
-                let arg = data
-                    .projection_term
-                    .args
-                    .iter()
-                    .chain(Some(data.term.into_arg()))
-                    .find(|g| g.has_non_region_infer());
-                if let Some(arg) = arg {
-                    self.emit_inference_failure_err(
-                        obligation.cause.body_id,
-                        span,
-                        arg,
-                        ErrorCode::E0284,
-                        true,
-                    )
-                    .with_note(format!("cannot satisfy `{predicate}`"))
-                } else {
-                    // If we can't find a generic parameter, just print a generic error
-                    struct_span_code_err!(
-                        self.dcx(),
-                        span,
-                        E0284,
-                        "type annotations needed: cannot satisfy `{}`",
-                        predicate,
-                    )
-                    .with_span_label(span, format!("cannot satisfy `{predicate}`"))
-                }
-            }
-
-            ty::PredicateKind::Clause(ty::ClauseKind::ConstEvaluatable(data)) => {
-                if let Err(e) = predicate.error_reported() {
-                    return e;
-                }
-                if let Some(e) = self.tainted_by_errors() {
-                    return e;
-                }
-                let arg = data.walk().find(|g| g.is_non_region_infer());
-                if let Some(arg) = arg {
-                    let err = self.emit_inference_failure_err(
-                        obligation.cause.body_id,
-                        span,
-                        arg,
-                        ErrorCode::E0284,
-                        true,
-                    );
-                    err
-                } else {
-                    // If we can't find a generic parameter, just print a generic error
-                    struct_span_code_err!(
-                        self.dcx(),
-                        span,
-                        E0284,
-                        "type annotations needed: cannot satisfy `{}`",
-                        predicate,
-                    )
-                    .with_span_label(span, format!("cannot satisfy `{predicate}`"))
-                }
-            }
-
-            ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(ct, ..)) => self
-                .emit_inference_failure_err(
-                    obligation.cause.body_id,
-                    span,
-                    ct.into(),
-                    ErrorCode::E0284,
-                    true,
-                ),
-            ty::PredicateKind::NormalizesTo(ty::NormalizesTo { alias, term })
-                if term.is_infer() =>
-            {
-                if let Some(e) = self.tainted_by_errors() {
-                    return e;
-                }
-                struct_span_code_err!(
-                    self.dcx(),
-                    span,
-                    E0284,
-                    "type annotations needed: cannot normalize `{alias}`",
-                )
-                .with_span_label(span, format!("cannot normalize `{alias}`"))
-            }
-
-            _ => {
-                if let Some(e) = self.tainted_by_errors() {
-                    return e;
-                }
-                struct_span_code_err!(
-                    self.dcx(),
-                    span,
-                    E0284,
-                    "type annotations needed: cannot satisfy `{}`",
-                    predicate,
-                )
-                .with_span_label(span, format!("cannot satisfy `{predicate}`"))
-            }
-        };
-        self.note_obligation_cause(&mut err, obligation);
-        err.emit()
-    }
-
-    fn annotate_source_of_ambiguity(
-        &self,
-        err: &mut Diag<'_>,
-        ambiguities: &[ambiguity::CandidateSource],
-        predicate: ty::Predicate<'tcx>,
-    ) {
-        let mut spans = vec![];
-        let mut crates = vec![];
-        let mut post = vec![];
-        let mut has_param_env = false;
-        for ambiguity in ambiguities {
-            match ambiguity {
-                ambiguity::CandidateSource::DefId(impl_def_id) => {
-                    match self.tcx.span_of_impl(*impl_def_id) {
-                        Ok(span) => spans.push(span),
-                        Err(name) => {
-                            crates.push(name);
-                            if let Some(header) = to_pretty_impl_header(self.tcx, *impl_def_id) {
-                                post.push(header);
-                            }
-                        }
-                    }
-                }
-                ambiguity::CandidateSource::ParamEnv(span) => {
-                    has_param_env = true;
-                    spans.push(*span);
-                }
-            }
-        }
-        let mut crate_names: Vec<_> = crates.iter().map(|n| format!("`{n}`")).collect();
-        crate_names.sort();
-        crate_names.dedup();
-        post.sort();
-        post.dedup();
-
-        if self.tainted_by_errors().is_some()
-            && (crate_names.len() == 1
-                && spans.len() == 0
-                && ["`core`", "`alloc`", "`std`"].contains(&crate_names[0].as_str())
-                || predicate.visit_with(&mut HasNumericInferVisitor).is_break())
-        {
-            // Avoid complaining about other inference issues for expressions like
-            // `42 >> 1`, where the types are still `{integer}`, but we want to
-            // Do we need `trait_ref.skip_binder().self_ty().is_numeric() &&` too?
-            // NOTE(eddyb) this was `.cancel()`, but `err`
-            // is borrowed, so we can't fully defuse it.
-            err.downgrade_to_delayed_bug();
-            return;
-        }
-
-        let msg = format!(
-            "multiple `impl`s{} satisfying `{}` found",
-            if has_param_env { " or `where` clauses" } else { "" },
-            predicate
-        );
-        let post = if post.len() > 1 || (post.len() == 1 && post[0].contains('\n')) {
-            format!(":\n{}", post.iter().map(|p| format!("- {p}")).collect::<Vec<_>>().join("\n"),)
-        } else if post.len() == 1 {
-            format!(": `{}`", post[0])
-        } else {
-            String::new()
-        };
-
-        match (spans.len(), crates.len(), crate_names.len()) {
-            (0, 0, 0) => {
-                err.note(format!("cannot satisfy `{predicate}`"));
-            }
-            (0, _, 1) => {
-                err.note(format!("{} in the `{}` crate{}", msg, crates[0], post,));
-            }
-            (0, _, _) => {
-                err.note(format!(
-                    "{} in the following crates: {}{}",
-                    msg,
-                    crate_names.join(", "),
-                    post,
-                ));
-            }
-            (_, 0, 0) => {
-                let span: MultiSpan = spans.into();
-                err.span_note(span, msg);
-            }
-            (_, 1, 1) => {
-                let span: MultiSpan = spans.into();
-                err.span_note(span, msg);
-                err.note(format!("and another `impl` found in the `{}` crate{}", crates[0], post,));
-            }
-            _ => {
-                let span: MultiSpan = spans.into();
-                err.span_note(span, msg);
-                err.note(format!(
-                    "and more `impl`s found in the following crates: {}{}",
-                    crate_names.join(", "),
-                    post,
-                ));
-            }
-        }
-    }
-
     /// Returns `true` if the trait predicate may apply for *some* assignment
     /// to the type parameters.
     fn predicate_can_apply(
@@ -2947,136 +2067,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
         }
     }
 
-    #[instrument(level = "debug", skip_all)]
-    fn suggest_unsized_bound_if_applicable(
-        &self,
-        err: &mut Diag<'_>,
-        obligation: &PredicateObligation<'tcx>,
-    ) {
-        let ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred)) =
-            obligation.predicate.kind().skip_binder()
-        else {
-            return;
-        };
-        let (ObligationCauseCode::WhereClause(item_def_id, span)
-        | ObligationCauseCode::WhereClauseInExpr(item_def_id, span, ..)) =
-            *obligation.cause.code().peel_derives()
-        else {
-            return;
-        };
-        if span.is_dummy() {
-            return;
-        }
-        debug!(?pred, ?item_def_id, ?span);
-
-        let (Some(node), true) = (
-            self.tcx.hir().get_if_local(item_def_id),
-            self.tcx.is_lang_item(pred.def_id(), LangItem::Sized),
-        ) else {
-            return;
-        };
-        self.maybe_suggest_unsized_generics(err, span, node);
-    }
-
-    #[instrument(level = "debug", skip_all)]
-    fn maybe_suggest_unsized_generics(&self, err: &mut Diag<'_>, span: Span, node: Node<'tcx>) {
-        let Some(generics) = node.generics() else {
-            return;
-        };
-        let sized_trait = self.tcx.lang_items().sized_trait();
-        debug!(?generics.params);
-        debug!(?generics.predicates);
-        let Some(param) = generics.params.iter().find(|param| param.span == span) else {
-            return;
-        };
-        // Check that none of the explicit trait bounds is `Sized`. Assume that an explicit
-        // `Sized` bound is there intentionally and we don't need to suggest relaxing it.
-        let explicitly_sized = generics
-            .bounds_for_param(param.def_id)
-            .flat_map(|bp| bp.bounds)
-            .any(|bound| bound.trait_ref().and_then(|tr| tr.trait_def_id()) == sized_trait);
-        if explicitly_sized {
-            return;
-        }
-        debug!(?param);
-        match node {
-            hir::Node::Item(
-                item @ hir::Item {
-                    // Only suggest indirection for uses of type parameters in ADTs.
-                    kind:
-                        hir::ItemKind::Enum(..) | hir::ItemKind::Struct(..) | hir::ItemKind::Union(..),
-                    ..
-                },
-            ) => {
-                if self.maybe_indirection_for_unsized(err, item, param) {
-                    return;
-                }
-            }
-            _ => {}
-        };
-
-        // Didn't add an indirection suggestion, so add a general suggestion to relax `Sized`.
-        let (span, separator, open_paren_sp) =
-            if let Some((s, open_paren_sp)) = generics.bounds_span_for_suggestions(param.def_id) {
-                (s, " +", open_paren_sp)
-            } else {
-                (param.name.ident().span.shrink_to_hi(), ":", None)
-            };
-
-        let mut suggs = vec![];
-        let suggestion = format!("{separator} ?Sized");
-
-        if let Some(open_paren_sp) = open_paren_sp {
-            suggs.push((open_paren_sp, "(".to_string()));
-            suggs.push((span, format!("){suggestion}")));
-        } else {
-            suggs.push((span, suggestion));
-        }
-
-        err.multipart_suggestion_verbose(
-            "consider relaxing the implicit `Sized` restriction",
-            suggs,
-            Applicability::MachineApplicable,
-        );
-    }
-
-    fn maybe_indirection_for_unsized(
-        &self,
-        err: &mut Diag<'_>,
-        item: &Item<'tcx>,
-        param: &GenericParam<'tcx>,
-    ) -> bool {
-        // Suggesting `T: ?Sized` is only valid in an ADT if `T` is only used in a
-        // borrow. `struct S<'a, T: ?Sized>(&'a T);` is valid, `struct S<T: ?Sized>(T);`
-        // is not. Look for invalid "bare" parameter uses, and suggest using indirection.
-        let mut visitor =
-            FindTypeParam { param: param.name.ident().name, invalid_spans: vec![], nested: false };
-        visitor.visit_item(item);
-        if visitor.invalid_spans.is_empty() {
-            return false;
-        }
-        let mut multispan: MultiSpan = param.span.into();
-        multispan.push_span_label(
-            param.span,
-            format!("this could be changed to `{}: ?Sized`...", param.name.ident()),
-        );
-        for sp in visitor.invalid_spans {
-            multispan.push_span_label(
-                sp,
-                format!("...if indirection were used here: `Box<{}>`", param.name.ident()),
-            );
-        }
-        err.span_help(
-            multispan,
-            format!(
-                "you could relax the implicit `Sized` bound on `{T}` if it were \
-                used through indirection like `&{T}` or `Box<{T}>`",
-                T = param.name.ident(),
-            ),
-        );
-        true
-    }
-
     fn is_recursive_obligation(
         &self,
         obligated_types: &mut Vec<Ty<'tcx>>,
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/infer_ctxt_ext.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/infer_ctxt_ext.rs
similarity index 99%
rename from compiler/rustc_trait_selection/src/traits/error_reporting/infer_ctxt_ext.rs
rename to compiler/rustc_trait_selection/src/error_reporting/traits/infer_ctxt_ext.rs
index 34da8e576ce86..e8d7e80ac562c 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/infer_ctxt_ext.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/infer_ctxt_ext.rs
@@ -1,3 +1,5 @@
+// FIXME(error_reporting): This should be made into private methods on `TypeErrCtxt`.
+
 use crate::infer::InferCtxt;
 use crate::traits::{Obligation, ObligationCause, ObligationCtxt};
 use rustc_errors::{codes::*, pluralize, struct_span_code_err, Applicability, Diag};
@@ -9,8 +11,6 @@ use rustc_span::{Span, DUMMY_SP};
 
 use super::ArgKind;
 
-pub use rustc_infer::traits::error_reporting::*;
-
 #[extension(pub trait InferCtxtExt<'tcx>)]
 impl<'tcx> InferCtxt<'tcx> {
     /// Given some node representing a fn-like thing in the HIR map,
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/mod.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/mod.rs
new file mode 100644
index 0000000000000..2131e236401ef
--- /dev/null
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/mod.rs
@@ -0,0 +1,385 @@
+pub mod ambiguity;
+mod fulfillment_errors;
+mod infer_ctxt_ext;
+pub mod on_unimplemented;
+mod overflow;
+pub mod suggestions;
+
+use std::iter;
+
+use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
+use rustc_hir::def_id::DefId;
+use rustc_hir::intravisit::Visitor;
+use rustc_hir::{self as hir, LangItem};
+use rustc_infer::infer::error_reporting::TypeErrCtxt;
+use rustc_infer::traits::{
+    Obligation, ObligationCause, ObligationCauseCode, PredicateObligation, SelectionError,
+};
+use rustc_macros::extension;
+use rustc_middle::ty::print::PrintTraitRefExt as _;
+use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_span::{ErrorGuaranteed, ExpnKind, Span};
+
+use ambiguity::TypeErrCtxtAmbiguityExt as _;
+use fulfillment_errors::TypeErrCtxtExt as _;
+use suggestions::TypeErrCtxtExt as _;
+
+use crate::traits::{FulfillmentError, FulfillmentErrorCode};
+
+pub use self::fulfillment_errors::*;
+pub use self::infer_ctxt_ext::*;
+pub use self::overflow::*;
+
+// When outputting impl candidates, prefer showing those that are more similar.
+//
+// We also compare candidates after skipping lifetimes, which has a lower
+// priority than exact matches.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub enum CandidateSimilarity {
+    Exact { ignoring_lifetimes: bool },
+    Fuzzy { ignoring_lifetimes: bool },
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct ImplCandidate<'tcx> {
+    pub trait_ref: ty::TraitRef<'tcx>,
+    pub similarity: CandidateSimilarity,
+    impl_def_id: DefId,
+}
+
+enum GetSafeTransmuteErrorAndReason {
+    Silent,
+    Error { err_msg: String, safe_transmute_explanation: Option<String> },
+}
+
+struct UnsatisfiedConst(pub bool);
+
+/// Crude way of getting back an `Expr` from a `Span`.
+pub struct FindExprBySpan<'hir> {
+    pub span: Span,
+    pub result: Option<&'hir hir::Expr<'hir>>,
+    pub ty_result: Option<&'hir hir::Ty<'hir>>,
+    pub include_closures: bool,
+    pub tcx: TyCtxt<'hir>,
+}
+
+impl<'hir> FindExprBySpan<'hir> {
+    pub fn new(span: Span, tcx: TyCtxt<'hir>) -> Self {
+        Self { span, result: None, ty_result: None, tcx, include_closures: false }
+    }
+}
+
+impl<'v> Visitor<'v> for FindExprBySpan<'v> {
+    type NestedFilter = rustc_middle::hir::nested_filter::OnlyBodies;
+
+    fn nested_visit_map(&mut self) -> Self::Map {
+        self.tcx.hir()
+    }
+
+    fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) {
+        if self.span == ex.span {
+            self.result = Some(ex);
+        } else {
+            if let hir::ExprKind::Closure(..) = ex.kind
+                && self.include_closures
+                && let closure_header_sp = self.span.with_hi(ex.span.hi())
+                && closure_header_sp == ex.span
+            {
+                self.result = Some(ex);
+            }
+            hir::intravisit::walk_expr(self, ex);
+        }
+    }
+
+    fn visit_ty(&mut self, ty: &'v hir::Ty<'v>) {
+        if self.span == ty.span {
+            self.ty_result = Some(ty);
+        } else {
+            hir::intravisit::walk_ty(self, ty);
+        }
+    }
+}
+
+/// Summarizes information
+#[derive(Clone)]
+pub enum ArgKind {
+    /// An argument of non-tuple type. Parameters are (name, ty)
+    Arg(String, String),
+
+    /// An argument of tuple type. For a "found" argument, the span is
+    /// the location in the source of the pattern. For an "expected"
+    /// argument, it will be None. The vector is a list of (name, ty)
+    /// strings for the components of the tuple.
+    Tuple(Option<Span>, Vec<(String, String)>),
+}
+
+impl ArgKind {
+    fn empty() -> ArgKind {
+        ArgKind::Arg("_".to_owned(), "_".to_owned())
+    }
+
+    /// Creates an `ArgKind` from the expected type of an
+    /// argument. It has no name (`_`) and an optional source span.
+    pub fn from_expected_ty(t: Ty<'_>, span: Option<Span>) -> ArgKind {
+        match t.kind() {
+            ty::Tuple(tys) => ArgKind::Tuple(
+                span,
+                tys.iter().map(|ty| ("_".to_owned(), ty.to_string())).collect::<Vec<_>>(),
+            ),
+            _ => ArgKind::Arg("_".to_owned(), t.to_string()),
+        }
+    }
+}
+
+#[derive(Copy, Clone)]
+pub enum DefIdOrName {
+    DefId(DefId),
+    Name(&'static str),
+}
+
+#[extension(pub trait TypeErrCtxtExt<'a, 'tcx>)]
+impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
+    fn report_fulfillment_errors(
+        &self,
+        mut errors: Vec<FulfillmentError<'tcx>>,
+    ) -> ErrorGuaranteed {
+        self.sub_relations
+            .borrow_mut()
+            .add_constraints(self, errors.iter().map(|e| e.obligation.predicate));
+
+        #[derive(Debug)]
+        struct ErrorDescriptor<'tcx> {
+            predicate: ty::Predicate<'tcx>,
+            index: Option<usize>, // None if this is an old error
+        }
+
+        let mut error_map: FxIndexMap<_, Vec<_>> = self
+            .reported_trait_errors
+            .borrow()
+            .iter()
+            .map(|(&span, predicates)| {
+                (
+                    span,
+                    predicates
+                        .0
+                        .iter()
+                        .map(|&predicate| ErrorDescriptor { predicate, index: None })
+                        .collect(),
+                )
+            })
+            .collect();
+
+        // Ensure `T: Sized` and `T: WF` obligations come last. This lets us display diagnostics
+        // with more relevant type information and hide redundant E0282 errors.
+        errors.sort_by_key(|e| match e.obligation.predicate.kind().skip_binder() {
+            ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred))
+                if self.tcx.is_lang_item(pred.def_id(), LangItem::Sized) =>
+            {
+                1
+            }
+            ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(_)) => 3,
+            ty::PredicateKind::Coerce(_) => 2,
+            _ => 0,
+        });
+
+        for (index, error) in errors.iter().enumerate() {
+            // We want to ignore desugarings here: spans are equivalent even
+            // if one is the result of a desugaring and the other is not.
+            let mut span = error.obligation.cause.span;
+            let expn_data = span.ctxt().outer_expn_data();
+            if let ExpnKind::Desugaring(_) = expn_data.kind {
+                span = expn_data.call_site;
+            }
+
+            error_map.entry(span).or_default().push(ErrorDescriptor {
+                predicate: error.obligation.predicate,
+                index: Some(index),
+            });
+        }
+
+        // We do this in 2 passes because we want to display errors in order, though
+        // maybe it *is* better to sort errors by span or something.
+        let mut is_suppressed = vec![false; errors.len()];
+        for (_, error_set) in error_map.iter() {
+            // We want to suppress "duplicate" errors with the same span.
+            for error in error_set {
+                if let Some(index) = error.index {
+                    // Suppress errors that are either:
+                    // 1) strictly implied by another error.
+                    // 2) implied by an error with a smaller index.
+                    for error2 in error_set {
+                        if error2.index.is_some_and(|index2| is_suppressed[index2]) {
+                            // Avoid errors being suppressed by already-suppressed
+                            // errors, to prevent all errors from being suppressed
+                            // at once.
+                            continue;
+                        }
+
+                        if self.error_implies(error2.predicate, error.predicate)
+                            && !(error2.index >= error.index
+                                && self.error_implies(error.predicate, error2.predicate))
+                        {
+                            info!("skipping {:?} (implied by {:?})", error, error2);
+                            is_suppressed[index] = true;
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+
+        let mut reported = None;
+
+        for from_expansion in [false, true] {
+            for (error, suppressed) in iter::zip(&errors, &is_suppressed) {
+                if !suppressed && error.obligation.cause.span.from_expansion() == from_expansion {
+                    let guar = self.report_fulfillment_error(error);
+                    self.infcx.set_tainted_by_errors(guar);
+                    reported = Some(guar);
+                    // We want to ignore desugarings here: spans are equivalent even
+                    // if one is the result of a desugaring and the other is not.
+                    let mut span = error.obligation.cause.span;
+                    let expn_data = span.ctxt().outer_expn_data();
+                    if let ExpnKind::Desugaring(_) = expn_data.kind {
+                        span = expn_data.call_site;
+                    }
+                    self.reported_trait_errors
+                        .borrow_mut()
+                        .entry(span)
+                        .or_insert_with(|| (vec![], guar))
+                        .0
+                        .push(error.obligation.predicate);
+                }
+            }
+        }
+
+        // It could be that we don't report an error because we have seen an `ErrorReported` from
+        // another source. We should probably be able to fix most of these, but some are delayed
+        // bugs that get a proper error after this function.
+        reported.unwrap_or_else(|| self.dcx().delayed_bug("failed to report fulfillment errors"))
+    }
+
+    #[instrument(skip(self), level = "debug")]
+    fn report_fulfillment_error(&self, error: &FulfillmentError<'tcx>) -> ErrorGuaranteed {
+        let mut error = FulfillmentError {
+            obligation: error.obligation.clone(),
+            code: error.code.clone(),
+            root_obligation: error.root_obligation.clone(),
+        };
+        if matches!(
+            error.code,
+            FulfillmentErrorCode::Select(crate::traits::SelectionError::Unimplemented)
+                | FulfillmentErrorCode::Project(_)
+        ) && self.apply_do_not_recommend(&mut error.obligation)
+        {
+            error.code = FulfillmentErrorCode::Select(SelectionError::Unimplemented);
+        }
+
+        match error.code {
+            FulfillmentErrorCode::Select(ref selection_error) => self.report_selection_error(
+                error.obligation.clone(),
+                &error.root_obligation,
+                selection_error,
+            ),
+            FulfillmentErrorCode::Project(ref e) => {
+                self.report_projection_error(&error.obligation, e)
+            }
+            FulfillmentErrorCode::Ambiguity { overflow: None } => {
+                self.maybe_report_ambiguity(&error.obligation)
+            }
+            FulfillmentErrorCode::Ambiguity { overflow: Some(suggest_increasing_limit) } => {
+                self.report_overflow_no_abort(error.obligation.clone(), suggest_increasing_limit)
+            }
+            FulfillmentErrorCode::Subtype(ref expected_found, ref err) => self
+                .report_mismatched_types(
+                    &error.obligation.cause,
+                    expected_found.expected,
+                    expected_found.found,
+                    *err,
+                )
+                .emit(),
+            FulfillmentErrorCode::ConstEquate(ref expected_found, ref err) => {
+                let mut diag = self.report_mismatched_consts(
+                    &error.obligation.cause,
+                    expected_found.expected,
+                    expected_found.found,
+                    *err,
+                );
+                let code = error.obligation.cause.code().peel_derives().peel_match_impls();
+                if let ObligationCauseCode::WhereClause(..)
+                | ObligationCauseCode::WhereClauseInExpr(..) = code
+                {
+                    self.note_obligation_cause_code(
+                        error.obligation.cause.body_id,
+                        &mut diag,
+                        error.obligation.predicate,
+                        error.obligation.param_env,
+                        code,
+                        &mut vec![],
+                        &mut Default::default(),
+                    );
+                }
+                diag.emit()
+            }
+            FulfillmentErrorCode::Cycle(ref cycle) => self.report_overflow_obligation_cycle(cycle),
+        }
+    }
+}
+
+/// Recovers the "impl X for Y" signature from `impl_def_id` and returns it as a
+/// string.
+pub(crate) fn to_pretty_impl_header(tcx: TyCtxt<'_>, impl_def_id: DefId) -> Option<String> {
+    use std::fmt::Write;
+
+    let trait_ref = tcx.impl_trait_ref(impl_def_id)?.instantiate_identity();
+    let mut w = "impl".to_owned();
+
+    let args = ty::GenericArgs::identity_for_item(tcx, impl_def_id);
+
+    // FIXME: Currently only handles ?Sized.
+    //        Needs to support ?Move and ?DynSized when they are implemented.
+    let mut types_without_default_bounds = FxIndexSet::default();
+    let sized_trait = tcx.lang_items().sized_trait();
+
+    let arg_names = args.iter().map(|k| k.to_string()).filter(|k| k != "'_").collect::<Vec<_>>();
+    if !arg_names.is_empty() {
+        types_without_default_bounds.extend(args.types());
+        w.push('<');
+        w.push_str(&arg_names.join(", "));
+        w.push('>');
+    }
+
+    write!(
+        w,
+        " {} for {}",
+        trait_ref.print_only_trait_path(),
+        tcx.type_of(impl_def_id).instantiate_identity()
+    )
+    .unwrap();
+
+    // The predicates will contain default bounds like `T: Sized`. We need to
+    // remove these bounds, and add `T: ?Sized` to any untouched type parameters.
+    let predicates = tcx.predicates_of(impl_def_id).predicates;
+    let mut pretty_predicates =
+        Vec::with_capacity(predicates.len() + types_without_default_bounds.len());
+
+    for (p, _) in predicates {
+        if let Some(poly_trait_ref) = p.as_trait_clause() {
+            if Some(poly_trait_ref.def_id()) == sized_trait {
+                // FIXME(#120456) - is `swap_remove` correct?
+                types_without_default_bounds.swap_remove(&poly_trait_ref.self_ty().skip_binder());
+                continue;
+            }
+        }
+        pretty_predicates.push(p.to_string());
+    }
+
+    pretty_predicates.extend(types_without_default_bounds.iter().map(|ty| format!("{ty}: ?Sized")));
+
+    if !pretty_predicates.is_empty() {
+        write!(w, "\n  where {}", pretty_predicates.join(", ")).unwrap();
+    }
+
+    w.push(';');
+    Some(w)
+}
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/on_unimplemented.rs
similarity index 99%
rename from compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
rename to compiler/rustc_trait_selection/src/error_reporting/traits/on_unimplemented.rs
index 94b28426f43b6..e90fe8fb94dd2 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/on_unimplemented.rs
@@ -1,10 +1,10 @@
 use super::{ObligationCauseCode, PredicateObligation};
+use crate::error_reporting::traits::fulfillment_errors::InferCtxtPrivExt;
 use crate::errors::{
     EmptyOnClauseInOnUnimplemented, InvalidOnClauseInOnUnimplemented, NoValueInOnUnimplemented,
 };
 use crate::infer::error_reporting::TypeErrCtxt;
 use crate::infer::InferCtxtExt;
-use crate::traits::error_reporting::type_err_ctxt_ext::InferCtxtPrivExt;
 use rustc_ast::AttrArgs;
 use rustc_ast::AttrArgsEq;
 use rustc_ast::AttrKind;
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/overflow.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/overflow.rs
new file mode 100644
index 0000000000000..061a5a4be2075
--- /dev/null
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/overflow.rs
@@ -0,0 +1,197 @@
+use std::fmt;
+
+use rustc_errors::{
+    struct_span_code_err, Diag, EmissionGuarantee, ErrorGuaranteed, FatalError, E0275,
+};
+use rustc_hir::def::Namespace;
+use rustc_hir::def_id::LOCAL_CRATE;
+use rustc_infer::infer::error_reporting::TypeErrCtxt;
+use rustc_infer::traits::{Obligation, PredicateObligation};
+use rustc_macros::extension;
+use rustc_middle::ty::print::{FmtPrinter, Print};
+use rustc_middle::ty::{self, TyCtxt};
+use rustc_session::Limit;
+use rustc_span::Span;
+use rustc_type_ir::Upcast;
+
+use super::InferCtxtPrivExt;
+use crate::error_reporting::traits::suggestions::TypeErrCtxtExt;
+
+pub enum OverflowCause<'tcx> {
+    DeeplyNormalize(ty::AliasTerm<'tcx>),
+    TraitSolver(ty::Predicate<'tcx>),
+}
+
+pub fn suggest_new_overflow_limit<'tcx, G: EmissionGuarantee>(
+    tcx: TyCtxt<'tcx>,
+    err: &mut Diag<'_, G>,
+) {
+    let suggested_limit = match tcx.recursion_limit() {
+        Limit(0) => Limit(2),
+        limit => limit * 2,
+    };
+    err.help(format!(
+        "consider increasing the recursion limit by adding a \
+         `#![recursion_limit = \"{}\"]` attribute to your crate (`{}`)",
+        suggested_limit,
+        tcx.crate_name(LOCAL_CRATE),
+    ));
+}
+
+#[extension(pub trait TypeErrCtxtOverflowExt<'a, 'tcx>)]
+impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
+    /// Reports that an overflow has occurred and halts compilation. We
+    /// halt compilation unconditionally because it is important that
+    /// overflows never be masked -- they basically represent computations
+    /// whose result could not be truly determined and thus we can't say
+    /// if the program type checks or not -- and they are unusual
+    /// occurrences in any case.
+    fn report_overflow_error(
+        &self,
+        cause: OverflowCause<'tcx>,
+        span: Span,
+        suggest_increasing_limit: bool,
+        mutate: impl FnOnce(&mut Diag<'_>),
+    ) -> ! {
+        let mut err = self.build_overflow_error(cause, span, suggest_increasing_limit);
+        mutate(&mut err);
+        err.emit();
+        FatalError.raise();
+    }
+
+    fn build_overflow_error(
+        &self,
+        cause: OverflowCause<'tcx>,
+        span: Span,
+        suggest_increasing_limit: bool,
+    ) -> Diag<'a> {
+        fn with_short_path<'tcx, T>(tcx: TyCtxt<'tcx>, value: T) -> String
+        where
+            T: fmt::Display + Print<'tcx, FmtPrinter<'tcx, 'tcx>>,
+        {
+            let s = value.to_string();
+            if s.len() > 50 {
+                // We don't need to save the type to a file, we will be talking about this type already
+                // in a separate note when we explain the obligation, so it will be available that way.
+                let mut cx: FmtPrinter<'_, '_> =
+                    FmtPrinter::new_with_limit(tcx, Namespace::TypeNS, rustc_session::Limit(6));
+                value.print(&mut cx).unwrap();
+                cx.into_buffer()
+            } else {
+                s
+            }
+        }
+
+        let mut err = match cause {
+            OverflowCause::DeeplyNormalize(alias_term) => {
+                let alias_term = self.resolve_vars_if_possible(alias_term);
+                let kind = alias_term.kind(self.tcx).descr();
+                let alias_str = with_short_path(self.tcx, alias_term);
+                struct_span_code_err!(
+                    self.dcx(),
+                    span,
+                    E0275,
+                    "overflow normalizing the {kind} `{alias_str}`",
+                )
+            }
+            OverflowCause::TraitSolver(predicate) => {
+                let predicate = self.resolve_vars_if_possible(predicate);
+                match predicate.kind().skip_binder() {
+                    ty::PredicateKind::Subtype(ty::SubtypePredicate { a, b, a_is_expected: _ })
+                    | ty::PredicateKind::Coerce(ty::CoercePredicate { a, b }) => {
+                        struct_span_code_err!(
+                            self.dcx(),
+                            span,
+                            E0275,
+                            "overflow assigning `{a}` to `{b}`",
+                        )
+                    }
+                    _ => {
+                        let pred_str = with_short_path(self.tcx, predicate);
+                        struct_span_code_err!(
+                            self.dcx(),
+                            span,
+                            E0275,
+                            "overflow evaluating the requirement `{pred_str}`",
+                        )
+                    }
+                }
+            }
+        };
+
+        if suggest_increasing_limit {
+            suggest_new_overflow_limit(self.tcx, &mut err);
+        }
+
+        err
+    }
+
+    /// Reports that an overflow has occurred and halts compilation. We
+    /// halt compilation unconditionally because it is important that
+    /// overflows never be masked -- they basically represent computations
+    /// whose result could not be truly determined and thus we can't say
+    /// if the program type checks or not -- and they are unusual
+    /// occurrences in any case.
+    fn report_overflow_obligation<T>(
+        &self,
+        obligation: &Obligation<'tcx, T>,
+        suggest_increasing_limit: bool,
+    ) -> !
+    where
+        T: Upcast<TyCtxt<'tcx>, ty::Predicate<'tcx>> + Clone,
+    {
+        let predicate = obligation.predicate.clone().upcast(self.tcx);
+        let predicate = self.resolve_vars_if_possible(predicate);
+        self.report_overflow_error(
+            OverflowCause::TraitSolver(predicate),
+            obligation.cause.span,
+            suggest_increasing_limit,
+            |err| {
+                self.note_obligation_cause_code(
+                    obligation.cause.body_id,
+                    err,
+                    predicate,
+                    obligation.param_env,
+                    obligation.cause.code(),
+                    &mut vec![],
+                    &mut Default::default(),
+                );
+            },
+        );
+    }
+
+    /// Reports that a cycle was detected which led to overflow and halts
+    /// compilation. This is equivalent to `report_overflow_obligation` except
+    /// that we can give a more helpful error message (and, in particular,
+    /// we do not suggest increasing the overflow limit, which is not
+    /// going to help).
+    fn report_overflow_obligation_cycle(&self, cycle: &[PredicateObligation<'tcx>]) -> ! {
+        let cycle = self.resolve_vars_if_possible(cycle.to_owned());
+        assert!(!cycle.is_empty());
+
+        debug!(?cycle, "report_overflow_error_cycle");
+
+        // The 'deepest' obligation is most likely to have a useful
+        // cause 'backtrace'
+        self.report_overflow_obligation(
+            cycle.iter().max_by_key(|p| p.recursion_depth).unwrap(),
+            false,
+        );
+    }
+
+    fn report_overflow_no_abort(
+        &self,
+        obligation: PredicateObligation<'tcx>,
+        suggest_increasing_limit: bool,
+    ) -> ErrorGuaranteed {
+        let obligation = self.resolve_vars_if_possible(obligation);
+        let mut err = self.build_overflow_error(
+            OverflowCause::TraitSolver(obligation.predicate),
+            obligation.cause.span,
+            suggest_increasing_limit,
+        );
+        self.note_obligation_cause(&mut err, &obligation);
+        self.point_at_returns_when_relevant(&mut err, &obligation);
+        err.emit()
+    }
+}
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
similarity index 97%
rename from compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
rename to compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
index 52edffce61459..2cf808f962f08 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
@@ -44,8 +44,8 @@ use std::assert_matches::debug_assert_matches;
 use std::borrow::Cow;
 use std::iter;
 
+use crate::error_reporting::traits::fulfillment_errors::InferCtxtPrivExt;
 use crate::infer::InferCtxtExt as _;
-use crate::traits::error_reporting::type_err_ctxt_ext::InferCtxtPrivExt;
 use crate::traits::query::evaluate_obligation::InferCtxtExt as _;
 use rustc_middle::ty::print::{
     with_forced_trimmed_paths, with_no_trimmed_paths, PrintPolyTraitPredicateExt as _,
@@ -4623,6 +4623,132 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             );
         }
     }
+
+    #[instrument(level = "debug", skip_all)]
+    fn suggest_unsized_bound_if_applicable(
+        &self,
+        err: &mut Diag<'_>,
+        obligation: &PredicateObligation<'tcx>,
+    ) {
+        let ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred)) =
+            obligation.predicate.kind().skip_binder()
+        else {
+            return;
+        };
+        let (ObligationCauseCode::WhereClause(item_def_id, span)
+        | ObligationCauseCode::WhereClauseInExpr(item_def_id, span, ..)) =
+            *obligation.cause.code().peel_derives()
+        else {
+            return;
+        };
+        if span.is_dummy() {
+            return;
+        }
+        debug!(?pred, ?item_def_id, ?span);
+
+        let (Some(node), true) = (
+            self.tcx.hir().get_if_local(item_def_id),
+            self.tcx.is_lang_item(pred.def_id(), LangItem::Sized),
+        ) else {
+            return;
+        };
+
+        let Some(generics) = node.generics() else {
+            return;
+        };
+        let sized_trait = self.tcx.lang_items().sized_trait();
+        debug!(?generics.params);
+        debug!(?generics.predicates);
+        let Some(param) = generics.params.iter().find(|param| param.span == span) else {
+            return;
+        };
+        // Check that none of the explicit trait bounds is `Sized`. Assume that an explicit
+        // `Sized` bound is there intentionally and we don't need to suggest relaxing it.
+        let explicitly_sized = generics
+            .bounds_for_param(param.def_id)
+            .flat_map(|bp| bp.bounds)
+            .any(|bound| bound.trait_ref().and_then(|tr| tr.trait_def_id()) == sized_trait);
+        if explicitly_sized {
+            return;
+        }
+        debug!(?param);
+        match node {
+            hir::Node::Item(
+                item @ hir::Item {
+                    // Only suggest indirection for uses of type parameters in ADTs.
+                    kind:
+                        hir::ItemKind::Enum(..) | hir::ItemKind::Struct(..) | hir::ItemKind::Union(..),
+                    ..
+                },
+            ) => {
+                if self.suggest_indirection_for_unsized(err, item, param) {
+                    return;
+                }
+            }
+            _ => {}
+        };
+
+        // Didn't add an indirection suggestion, so add a general suggestion to relax `Sized`.
+        let (span, separator, open_paren_sp) =
+            if let Some((s, open_paren_sp)) = generics.bounds_span_for_suggestions(param.def_id) {
+                (s, " +", open_paren_sp)
+            } else {
+                (param.name.ident().span.shrink_to_hi(), ":", None)
+            };
+
+        let mut suggs = vec![];
+        let suggestion = format!("{separator} ?Sized");
+
+        if let Some(open_paren_sp) = open_paren_sp {
+            suggs.push((open_paren_sp, "(".to_string()));
+            suggs.push((span, format!("){suggestion}")));
+        } else {
+            suggs.push((span, suggestion));
+        }
+
+        err.multipart_suggestion_verbose(
+            "consider relaxing the implicit `Sized` restriction",
+            suggs,
+            Applicability::MachineApplicable,
+        );
+    }
+
+    fn suggest_indirection_for_unsized(
+        &self,
+        err: &mut Diag<'_>,
+        item: &hir::Item<'tcx>,
+        param: &hir::GenericParam<'tcx>,
+    ) -> bool {
+        // Suggesting `T: ?Sized` is only valid in an ADT if `T` is only used in a
+        // borrow. `struct S<'a, T: ?Sized>(&'a T);` is valid, `struct S<T: ?Sized>(T);`
+        // is not. Look for invalid "bare" parameter uses, and suggest using indirection.
+        let mut visitor =
+            FindTypeParam { param: param.name.ident().name, invalid_spans: vec![], nested: false };
+        visitor.visit_item(item);
+        if visitor.invalid_spans.is_empty() {
+            return false;
+        }
+        let mut multispan: MultiSpan = param.span.into();
+        multispan.push_span_label(
+            param.span,
+            format!("this could be changed to `{}: ?Sized`...", param.name.ident()),
+        );
+        for sp in visitor.invalid_spans {
+            multispan.push_span_label(
+                sp,
+                format!("...if indirection were used here: `Box<{}>`", param.name.ident()),
+            );
+        }
+        err.span_help(
+            multispan,
+            format!(
+                "you could relax the implicit `Sized` bound on `{T}` if it were \
+                used through indirection like `&{T}` or `Box<{T}>`",
+                T = param.name.ident(),
+            ),
+        );
+        true
+    }
 }
 
 /// Add a hint to add a missing borrow or remove an unnecessary one.
@@ -5126,3 +5252,46 @@ fn get_deref_type_and_refs(mut ty: Ty<'_>) -> (Ty<'_>, Vec<hir::Mutability>) {
 
     (ty, refs)
 }
+
+/// Look for type `param` in an ADT being used only through a reference to confirm that suggesting
+/// `param: ?Sized` would be a valid constraint.
+struct FindTypeParam {
+    param: rustc_span::Symbol,
+    invalid_spans: Vec<Span>,
+    nested: bool,
+}
+
+impl<'v> Visitor<'v> for FindTypeParam {
+    fn visit_where_predicate(&mut self, _: &'v hir::WherePredicate<'v>) {
+        // Skip where-clauses, to avoid suggesting indirection for type parameters found there.
+    }
+
+    fn visit_ty(&mut self, ty: &hir::Ty<'_>) {
+        // We collect the spans of all uses of the "bare" type param, like in `field: T` or
+        // `field: (T, T)` where we could make `T: ?Sized` while skipping cases that are known to be
+        // valid like `field: &'a T` or `field: *mut T` and cases that *might* have further `Sized`
+        // obligations like `Box<T>` and `Vec<T>`, but we perform no extra analysis for those cases
+        // and suggest `T: ?Sized` regardless of their obligations. This is fine because the errors
+        // in that case should make what happened clear enough.
+        match ty.kind {
+            hir::TyKind::Ptr(_) | hir::TyKind::Ref(..) | hir::TyKind::TraitObject(..) => {}
+            hir::TyKind::Path(hir::QPath::Resolved(None, path))
+                if path.segments.len() == 1 && path.segments[0].ident.name == self.param =>
+            {
+                if !self.nested {
+                    debug!(?ty, "FindTypeParam::visit_ty");
+                    self.invalid_spans.push(ty.span);
+                }
+            }
+            hir::TyKind::Path(_) => {
+                let prev = self.nested;
+                self.nested = true;
+                hir::intravisit::walk_ty(self, ty);
+                self.nested = prev;
+            }
+            _ => {
+                hir::intravisit::walk_ty(self, ty);
+            }
+        }
+    }
+}
diff --git a/compiler/rustc_trait_selection/src/lib.rs b/compiler/rustc_trait_selection/src/lib.rs
index 37008baca2899..d0a12d73941d9 100644
--- a/compiler/rustc_trait_selection/src/lib.rs
+++ b/compiler/rustc_trait_selection/src/lib.rs
@@ -33,6 +33,7 @@
 #[macro_use]
 extern crate tracing;
 
+pub mod error_reporting;
 pub mod errors;
 pub mod infer;
 pub mod regions;
diff --git a/compiler/rustc_trait_selection/src/solve/normalize.rs b/compiler/rustc_trait_selection/src/solve/normalize.rs
index 2679da942b763..ca313590265d2 100644
--- a/compiler/rustc_trait_selection/src/solve/normalize.rs
+++ b/compiler/rustc_trait_selection/src/solve/normalize.rs
@@ -1,7 +1,7 @@
 use std::fmt::Debug;
 use std::marker::PhantomData;
 
-use crate::traits::error_reporting::{OverflowCause, TypeErrCtxtExt};
+use crate::error_reporting::traits::{OverflowCause, TypeErrCtxtOverflowExt};
 use crate::traits::query::evaluate_obligation::InferCtxtExt;
 use crate::traits::{BoundVarReplacer, PlaceholderReplacer, ScrubbedTraitError};
 use rustc_data_structures::stack::ensure_sufficient_stack;
diff --git a/compiler/rustc_trait_selection/src/traits/coherence.rs b/compiler/rustc_trait_selection/src/traits/coherence.rs
index fc390bf318dc1..7e996c5c5ef6e 100644
--- a/compiler/rustc_trait_selection/src/traits/coherence.rs
+++ b/compiler/rustc_trait_selection/src/traits/coherence.rs
@@ -30,8 +30,8 @@ use rustc_span::symbol::sym;
 use rustc_span::{Span, DUMMY_SP};
 use std::fmt::Debug;
 
-use super::error_reporting::suggest_new_overflow_limit;
 use super::ObligationCtxt;
+use crate::error_reporting::traits::suggest_new_overflow_limit;
 
 pub struct OverlapResult<'tcx> {
     pub impl_header: ty::ImplHeader<'tcx>,
diff --git a/compiler/rustc_trait_selection/src/traits/engine.rs b/compiler/rustc_trait_selection/src/traits/engine.rs
index 811f61d2bf37f..bdc27e734f97e 100644
--- a/compiler/rustc_trait_selection/src/traits/engine.rs
+++ b/compiler/rustc_trait_selection/src/traits/engine.rs
@@ -3,10 +3,10 @@ use std::fmt::Debug;
 
 use super::{FromSolverError, TraitEngine};
 use super::{FulfillmentContext, ScrubbedTraitError};
+use crate::error_reporting::traits::TypeErrCtxtExt;
 use crate::regions::InferCtxtRegionExt;
 use crate::solve::FulfillmentCtxt as NextFulfillmentCtxt;
 use crate::solve::NextSolverError;
-use crate::traits::error_reporting::TypeErrCtxtExt;
 use crate::traits::fulfill::OldSolverError;
 use crate::traits::NormalizeExt;
 use crate::traits::StructurallyNormalizeExt;
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/ambiguity.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/ambiguity.rs
deleted file mode 100644
index e6cb28df593af..0000000000000
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/ambiguity.rs
+++ /dev/null
@@ -1,136 +0,0 @@
-use rustc_hir::def_id::DefId;
-use rustc_infer::infer::{BoundRegionConversionTime, InferCtxt};
-use rustc_infer::traits::util::elaborate;
-use rustc_infer::traits::{Obligation, ObligationCause, PolyTraitObligation};
-use rustc_middle::ty;
-use rustc_span::{Span, DUMMY_SP};
-
-use crate::traits::query::evaluate_obligation::InferCtxtExt;
-use crate::traits::ObligationCtxt;
-
-#[derive(Debug)]
-pub enum CandidateSource {
-    DefId(DefId),
-    ParamEnv(Span),
-}
-
-pub fn compute_applicable_impls_for_diagnostics<'tcx>(
-    infcx: &InferCtxt<'tcx>,
-    obligation: &PolyTraitObligation<'tcx>,
-) -> Vec<CandidateSource> {
-    let tcx = infcx.tcx;
-    let param_env = obligation.param_env;
-
-    let predicate_polarity = obligation.predicate.skip_binder().polarity;
-
-    let impl_may_apply = |impl_def_id| {
-        let ocx = ObligationCtxt::new(infcx);
-        infcx.enter_forall(obligation.predicate, |placeholder_obligation| {
-            let obligation_trait_ref = ocx.normalize(
-                &ObligationCause::dummy(),
-                param_env,
-                placeholder_obligation.trait_ref,
-            );
-
-            let impl_args = infcx.fresh_args_for_item(DUMMY_SP, impl_def_id);
-            let impl_trait_ref =
-                tcx.impl_trait_ref(impl_def_id).unwrap().instantiate(tcx, impl_args);
-            let impl_trait_ref =
-                ocx.normalize(&ObligationCause::dummy(), param_env, impl_trait_ref);
-
-            if let Err(_) =
-                ocx.eq(&ObligationCause::dummy(), param_env, obligation_trait_ref, impl_trait_ref)
-            {
-                return false;
-            }
-
-            let impl_trait_header = tcx.impl_trait_header(impl_def_id).unwrap();
-            let impl_polarity = impl_trait_header.polarity;
-
-            match (impl_polarity, predicate_polarity) {
-                (ty::ImplPolarity::Positive, ty::PredicatePolarity::Positive)
-                | (ty::ImplPolarity::Negative, ty::PredicatePolarity::Negative) => {}
-                _ => return false,
-            }
-
-            let obligations = tcx
-                .predicates_of(impl_def_id)
-                .instantiate(tcx, impl_args)
-                .into_iter()
-                .map(|(predicate, _)| {
-                    Obligation::new(tcx, ObligationCause::dummy(), param_env, predicate)
-                })
-                // Kinda hacky, but let's just throw away obligations that overflow.
-                // This may reduce the accuracy of this check (if the obligation guides
-                // inference or it actually resulted in error after others are processed)
-                // ... but this is diagnostics code.
-                .filter(|obligation| {
-                    infcx.next_trait_solver() || infcx.evaluate_obligation(obligation).is_ok()
-                });
-            ocx.register_obligations(obligations);
-
-            ocx.select_where_possible().is_empty()
-        })
-    };
-
-    let param_env_candidate_may_apply = |poly_trait_predicate: ty::PolyTraitPredicate<'tcx>| {
-        let ocx = ObligationCtxt::new(infcx);
-        infcx.enter_forall(obligation.predicate, |placeholder_obligation| {
-            let obligation_trait_ref = ocx.normalize(
-                &ObligationCause::dummy(),
-                param_env,
-                placeholder_obligation.trait_ref,
-            );
-
-            let param_env_predicate = infcx.instantiate_binder_with_fresh_vars(
-                DUMMY_SP,
-                BoundRegionConversionTime::HigherRankedType,
-                poly_trait_predicate,
-            );
-            let param_env_trait_ref =
-                ocx.normalize(&ObligationCause::dummy(), param_env, param_env_predicate.trait_ref);
-
-            if let Err(_) = ocx.eq(
-                &ObligationCause::dummy(),
-                param_env,
-                obligation_trait_ref,
-                param_env_trait_ref,
-            ) {
-                return false;
-            }
-
-            ocx.select_where_possible().is_empty()
-        })
-    };
-
-    let mut ambiguities = Vec::new();
-
-    tcx.for_each_relevant_impl(
-        obligation.predicate.def_id(),
-        obligation.predicate.skip_binder().trait_ref.self_ty(),
-        |impl_def_id| {
-            if infcx.probe(|_| impl_may_apply(impl_def_id)) {
-                ambiguities.push(CandidateSource::DefId(impl_def_id))
-            }
-        },
-    );
-
-    let predicates =
-        tcx.predicates_of(obligation.cause.body_id.to_def_id()).instantiate_identity(tcx);
-    for (pred, span) in elaborate(tcx, predicates.into_iter()) {
-        let kind = pred.kind();
-        if let ty::ClauseKind::Trait(trait_pred) = kind.skip_binder()
-            && param_env_candidate_may_apply(kind.rebind(trait_pred))
-        {
-            if kind.rebind(trait_pred.trait_ref)
-                == ty::Binder::dummy(ty::TraitRef::identity(tcx, trait_pred.def_id()))
-            {
-                ambiguities.push(CandidateSource::ParamEnv(tcx.def_span(trait_pred.def_id())))
-            } else {
-                ambiguities.push(CandidateSource::ParamEnv(span))
-            }
-        }
-    }
-
-    ambiguities
-}
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
deleted file mode 100644
index 633d488f7be5f..0000000000000
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
+++ /dev/null
@@ -1,182 +0,0 @@
-// ignore-tidy-filelength :(
-
-pub mod ambiguity;
-mod infer_ctxt_ext;
-pub mod on_unimplemented;
-pub mod suggestions;
-mod type_err_ctxt_ext;
-
-use super::{Obligation, ObligationCause, ObligationCauseCode, PredicateObligation};
-use rustc_hir as hir;
-use rustc_hir::def_id::DefId;
-use rustc_hir::intravisit::Visitor;
-use rustc_middle::ty::{self, Ty, TyCtxt};
-use rustc_span::Span;
-use std::ops::ControlFlow;
-
-pub use self::infer_ctxt_ext::*;
-pub use self::type_err_ctxt_ext::*;
-
-// When outputting impl candidates, prefer showing those that are more similar.
-//
-// We also compare candidates after skipping lifetimes, which has a lower
-// priority than exact matches.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
-pub enum CandidateSimilarity {
-    Exact { ignoring_lifetimes: bool },
-    Fuzzy { ignoring_lifetimes: bool },
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct ImplCandidate<'tcx> {
-    pub trait_ref: ty::TraitRef<'tcx>,
-    pub similarity: CandidateSimilarity,
-    impl_def_id: DefId,
-}
-
-enum GetSafeTransmuteErrorAndReason {
-    Silent,
-    Error { err_msg: String, safe_transmute_explanation: Option<String> },
-}
-
-struct UnsatisfiedConst(pub bool);
-
-/// Crude way of getting back an `Expr` from a `Span`.
-pub struct FindExprBySpan<'hir> {
-    pub span: Span,
-    pub result: Option<&'hir hir::Expr<'hir>>,
-    pub ty_result: Option<&'hir hir::Ty<'hir>>,
-    pub include_closures: bool,
-    pub tcx: TyCtxt<'hir>,
-}
-
-impl<'hir> FindExprBySpan<'hir> {
-    pub fn new(span: Span, tcx: TyCtxt<'hir>) -> Self {
-        Self { span, result: None, ty_result: None, tcx, include_closures: false }
-    }
-}
-
-impl<'v> Visitor<'v> for FindExprBySpan<'v> {
-    type NestedFilter = rustc_middle::hir::nested_filter::OnlyBodies;
-
-    fn nested_visit_map(&mut self) -> Self::Map {
-        self.tcx.hir()
-    }
-
-    fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) {
-        if self.span == ex.span {
-            self.result = Some(ex);
-        } else {
-            if let hir::ExprKind::Closure(..) = ex.kind
-                && self.include_closures
-                && let closure_header_sp = self.span.with_hi(ex.span.hi())
-                && closure_header_sp == ex.span
-            {
-                self.result = Some(ex);
-            }
-            hir::intravisit::walk_expr(self, ex);
-        }
-    }
-
-    fn visit_ty(&mut self, ty: &'v hir::Ty<'v>) {
-        if self.span == ty.span {
-            self.ty_result = Some(ty);
-        } else {
-            hir::intravisit::walk_ty(self, ty);
-        }
-    }
-}
-
-/// Look for type `param` in an ADT being used only through a reference to confirm that suggesting
-/// `param: ?Sized` would be a valid constraint.
-struct FindTypeParam {
-    param: rustc_span::Symbol,
-    invalid_spans: Vec<Span>,
-    nested: bool,
-}
-
-impl<'v> Visitor<'v> for FindTypeParam {
-    fn visit_where_predicate(&mut self, _: &'v hir::WherePredicate<'v>) {
-        // Skip where-clauses, to avoid suggesting indirection for type parameters found there.
-    }
-
-    fn visit_ty(&mut self, ty: &hir::Ty<'_>) {
-        // We collect the spans of all uses of the "bare" type param, like in `field: T` or
-        // `field: (T, T)` where we could make `T: ?Sized` while skipping cases that are known to be
-        // valid like `field: &'a T` or `field: *mut T` and cases that *might* have further `Sized`
-        // obligations like `Box<T>` and `Vec<T>`, but we perform no extra analysis for those cases
-        // and suggest `T: ?Sized` regardless of their obligations. This is fine because the errors
-        // in that case should make what happened clear enough.
-        match ty.kind {
-            hir::TyKind::Ptr(_) | hir::TyKind::Ref(..) | hir::TyKind::TraitObject(..) => {}
-            hir::TyKind::Path(hir::QPath::Resolved(None, path))
-                if path.segments.len() == 1 && path.segments[0].ident.name == self.param =>
-            {
-                if !self.nested {
-                    debug!(?ty, "FindTypeParam::visit_ty");
-                    self.invalid_spans.push(ty.span);
-                }
-            }
-            hir::TyKind::Path(_) => {
-                let prev = self.nested;
-                self.nested = true;
-                hir::intravisit::walk_ty(self, ty);
-                self.nested = prev;
-            }
-            _ => {
-                hir::intravisit::walk_ty(self, ty);
-            }
-        }
-    }
-}
-
-/// Summarizes information
-#[derive(Clone)]
-pub enum ArgKind {
-    /// An argument of non-tuple type. Parameters are (name, ty)
-    Arg(String, String),
-
-    /// An argument of tuple type. For a "found" argument, the span is
-    /// the location in the source of the pattern. For an "expected"
-    /// argument, it will be None. The vector is a list of (name, ty)
-    /// strings for the components of the tuple.
-    Tuple(Option<Span>, Vec<(String, String)>),
-}
-
-impl ArgKind {
-    fn empty() -> ArgKind {
-        ArgKind::Arg("_".to_owned(), "_".to_owned())
-    }
-
-    /// Creates an `ArgKind` from the expected type of an
-    /// argument. It has no name (`_`) and an optional source span.
-    pub fn from_expected_ty(t: Ty<'_>, span: Option<Span>) -> ArgKind {
-        match t.kind() {
-            ty::Tuple(tys) => ArgKind::Tuple(
-                span,
-                tys.iter().map(|ty| ("_".to_owned(), ty.to_string())).collect::<Vec<_>>(),
-            ),
-            _ => ArgKind::Arg("_".to_owned(), t.to_string()),
-        }
-    }
-}
-
-struct HasNumericInferVisitor;
-
-impl<'tcx> ty::TypeVisitor<TyCtxt<'tcx>> for HasNumericInferVisitor {
-    type Result = ControlFlow<()>;
-
-    fn visit_ty(&mut self, ty: Ty<'tcx>) -> Self::Result {
-        if matches!(ty.kind(), ty::Infer(ty::FloatVar(_) | ty::IntVar(_))) {
-            ControlFlow::Break(())
-        } else {
-            ControlFlow::Continue(())
-        }
-    }
-}
-
-#[derive(Copy, Clone)]
-pub enum DefIdOrName {
-    DefId(DefId),
-    Name(&'static str),
-}
diff --git a/compiler/rustc_trait_selection/src/traits/fulfill.rs b/compiler/rustc_trait_selection/src/traits/fulfill.rs
index bce5c7101cc54..5597c8be59258 100644
--- a/compiler/rustc_trait_selection/src/traits/fulfill.rs
+++ b/compiler/rustc_trait_selection/src/traits/fulfill.rs
@@ -1,5 +1,5 @@
+use crate::error_reporting::traits::TypeErrCtxtOverflowExt;
 use crate::infer::{InferCtxt, TyOrConstInferVar};
-use crate::traits::error_reporting::TypeErrCtxtExt;
 use crate::traits::normalize::normalize_with_depth_to;
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::obligation_forest::ProcessResult;
diff --git a/compiler/rustc_trait_selection/src/traits/mod.rs b/compiler/rustc_trait_selection/src/traits/mod.rs
index 662d95db8ba5c..703ff2f7f1698 100644
--- a/compiler/rustc_trait_selection/src/traits/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/mod.rs
@@ -6,7 +6,6 @@ pub mod auto_trait;
 pub(crate) mod coherence;
 pub mod const_evaluatable;
 mod engine;
-pub mod error_reporting;
 mod fulfill;
 pub mod misc;
 pub mod normalize;
@@ -24,10 +23,10 @@ mod util;
 pub mod vtable;
 pub mod wf;
 
+use crate::error_reporting::traits::TypeErrCtxtExt as _;
 use crate::infer::outlives::env::OutlivesEnvironment;
 use crate::infer::{InferCtxt, TyCtxtInferExt};
 use crate::regions::InferCtxtRegionExt;
-use crate::traits::error_reporting::TypeErrCtxtExt as _;
 use crate::traits::query::evaluate_obligation::InferCtxtExt as _;
 use rustc_errors::ErrorGuaranteed;
 use rustc_middle::query::Providers;
diff --git a/compiler/rustc_trait_selection/src/traits/normalize.rs b/compiler/rustc_trait_selection/src/traits/normalize.rs
index a9ac0f7eb25bb..3a7481acbafd3 100644
--- a/compiler/rustc_trait_selection/src/traits/normalize.rs
+++ b/compiler/rustc_trait_selection/src/traits/normalize.rs
@@ -1,9 +1,9 @@
 //! Deeply normalize types using the old trait solver.
 
-use super::error_reporting::OverflowCause;
-use super::error_reporting::TypeErrCtxtExt;
 use super::SelectionContext;
 use super::{project, with_replaced_escaping_bound_vars, BoundVarReplacer, PlaceholderReplacer};
+use crate::error_reporting::traits::OverflowCause;
+use crate::error_reporting::traits::TypeErrCtxtOverflowExt;
 use crate::solve::NextSolverError;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_infer::infer::at::At;
@@ -109,16 +109,13 @@ pub(super) fn needs_normalization<'tcx, T: TypeVisitable<TyCtxt<'tcx>>>(
     value: &T,
     reveal: Reveal,
 ) -> bool {
-    // This mirrors `ty::TypeFlags::HAS_ALIASES` except that we take `Reveal` into account.
-
-    let mut flags = ty::TypeFlags::HAS_TY_PROJECTION
-        | ty::TypeFlags::HAS_TY_WEAK
-        | ty::TypeFlags::HAS_TY_INHERENT
-        | ty::TypeFlags::HAS_CT_PROJECTION;
+    let mut flags = ty::TypeFlags::HAS_ALIAS;
 
+    // Opaques are treated as rigid with `Reveal::UserFacing`,
+    // so we can ignore those.
     match reveal {
-        Reveal::UserFacing => {}
-        Reveal::All => flags |= ty::TypeFlags::HAS_TY_OPAQUE,
+        Reveal::UserFacing => flags.remove(ty::TypeFlags::HAS_TY_OPAQUE),
+        Reveal::All => {}
     }
 
     value.has_type_flags(flags)
diff --git a/compiler/rustc_trait_selection/src/traits/query/normalize.rs b/compiler/rustc_trait_selection/src/traits/query/normalize.rs
index bed76b84ee075..c11e86abef8a4 100644
--- a/compiler/rustc_trait_selection/src/traits/query/normalize.rs
+++ b/compiler/rustc_trait_selection/src/traits/query/normalize.rs
@@ -2,11 +2,11 @@
 //! which folds deeply, invoking the underlying
 //! `normalize_canonicalized_projection_ty` query when it encounters projections.
 
+use crate::error_reporting::traits::OverflowCause;
+use crate::error_reporting::traits::TypeErrCtxtOverflowExt;
 use crate::infer::at::At;
 use crate::infer::canonical::OriginalQueryValues;
 use crate::infer::{InferCtxt, InferOk};
-use crate::traits::error_reporting::OverflowCause;
-use crate::traits::error_reporting::TypeErrCtxtExt;
 use crate::traits::normalize::needs_normalization;
 use crate::traits::Normalized;
 use crate::traits::{BoundVarReplacer, PlaceholderReplacer, ScrubbedTraitError};
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs
index cc082ad98aa99..7a93f59f16394 100644
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -18,9 +18,9 @@ use super::{
     TraitQueryMode,
 };
 
+use crate::error_reporting::traits::TypeErrCtxtOverflowExt;
 use crate::infer::{InferCtxt, InferCtxtExt, InferOk, TypeFreshener};
 use crate::solve::InferCtxtSelectExt as _;
-use crate::traits::error_reporting::TypeErrCtxtExt;
 use crate::traits::normalize::normalize_with_depth;
 use crate::traits::normalize::normalize_with_depth_to;
 use crate::traits::project::ProjectAndUnifyResult;
@@ -64,20 +64,6 @@ mod _match;
 mod candidate_assembly;
 mod confirmation;
 
-/// Whether to consider the binder of higher ranked goals for the `leak_check` when
-/// evaluating higher-ranked goals. See #119820 for more info.
-///
-/// While this is a bit hacky, it is necessary to match the behavior of the new solver:
-/// We eagerly instantiate binders in the new solver, outside of candidate selection, so
-/// the leak check inside of candidates does not consider any bound vars from the higher
-/// ranked goal. However, we do exit the binder once we're completely finished with a goal,
-/// so the leak-check can be used in evaluate by causing nested higher-ranked goals to fail.
-#[derive(Debug, Copy, Clone)]
-enum LeakCheckHigherRankedGoal {
-    No,
-    Yes,
-}
-
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
 pub enum IntercrateAmbiguityCause<'tcx> {
     DownstreamCrate { trait_ref: ty::TraitRef<'tcx>, self_ty: Option<Ty<'tcx>> },
@@ -402,10 +388,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                     let mut no_candidates_apply = true;
 
                     for c in candidate_set.vec.iter() {
-                        if self
-                            .evaluate_candidate(stack, c, LeakCheckHigherRankedGoal::No)?
-                            .may_apply()
-                        {
+                        if self.evaluate_candidate(stack, c)?.may_apply() {
                             no_candidates_apply = false;
                             break;
                         }
@@ -476,7 +459,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         // is needed for specialization. Propagate overflow if it occurs.
         let mut candidates = candidates
             .into_iter()
-            .map(|c| match self.evaluate_candidate(stack, &c, LeakCheckHigherRankedGoal::No) {
+            .map(|c| match self.evaluate_candidate(stack, &c) {
                 Ok(eval) if eval.may_apply() => {
                     Ok(Some(EvaluatedCandidate { candidate: c, evaluation: eval }))
                 }
@@ -566,7 +549,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         obligation: &PredicateObligation<'tcx>,
     ) -> Result<EvaluationResult, OverflowError> {
         debug_assert!(!self.infcx.next_trait_solver());
-        self.evaluation_probe(|this, _outer_universe| {
+        self.evaluation_probe(|this| {
             let goal =
                 this.infcx.resolve_vars_if_possible((obligation.predicate, obligation.param_env));
             let mut result = this.evaluate_predicate_recursively(
@@ -589,11 +572,11 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     /// `op`, but this can be overwritten if necessary.
     fn evaluation_probe(
         &mut self,
-        op: impl FnOnce(&mut Self, &mut ty::UniverseIndex) -> Result<EvaluationResult, OverflowError>,
+        op: impl FnOnce(&mut Self) -> Result<EvaluationResult, OverflowError>,
     ) -> Result<EvaluationResult, OverflowError> {
         self.infcx.probe(|snapshot| -> Result<EvaluationResult, OverflowError> {
-            let mut outer_universe = self.infcx.universe();
-            let result = op(self, &mut outer_universe)?;
+            let outer_universe = self.infcx.universe();
+            let result = op(self)?;
 
             match self.infcx.leak_check(outer_universe, Some(snapshot)) {
                 Ok(()) => {}
@@ -1254,7 +1237,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         }
 
         match self.candidate_from_obligation(stack) {
-            Ok(Some(c)) => self.evaluate_candidate(stack, &c, LeakCheckHigherRankedGoal::Yes),
+            Ok(Some(c)) => self.evaluate_candidate(stack, &c),
             Ok(None) => Ok(EvaluatedToAmbig),
             Err(Overflow(OverflowError::Canonical)) => Err(OverflowError::Canonical),
             Err(..) => Ok(EvaluatedToErr),
@@ -1279,10 +1262,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     /// Further evaluates `candidate` to decide whether all type parameters match and whether nested
     /// obligations are met. Returns whether `candidate` remains viable after this further
     /// scrutiny.
-    ///
-    /// Depending on the value of [LeakCheckHigherRankedGoal], we may ignore the binder of the goal
-    /// when eagerly detecting higher ranked region errors via the `leak_check`. See that enum for
-    /// more info.
     #[instrument(
         level = "debug",
         skip(self, stack),
@@ -1293,25 +1272,9 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         &mut self,
         stack: &TraitObligationStack<'o, 'tcx>,
         candidate: &SelectionCandidate<'tcx>,
-        leak_check_higher_ranked_goal: LeakCheckHigherRankedGoal,
     ) -> Result<EvaluationResult, OverflowError> {
-        let mut result = self.evaluation_probe(|this, outer_universe| {
-            // We eagerly instantiate higher ranked goals to prevent universe errors
-            // from impacting candidate selection. This matches the behavior of the new
-            // solver. This slightly weakens type inference.
-            //
-            // In case there are no unresolved type or const variables this
-            // should still not be necessary to select a unique impl as any overlap
-            // relying on a universe error from higher ranked goals should have resulted
-            // in an overlap error in coherence.
-            let p = self.infcx.enter_forall_and_leak_universe(stack.obligation.predicate);
-            let obligation = stack.obligation.with(this.tcx(), ty::Binder::dummy(p));
-            match leak_check_higher_ranked_goal {
-                LeakCheckHigherRankedGoal::No => *outer_universe = self.infcx.universe(),
-                LeakCheckHigherRankedGoal::Yes => {}
-            }
-
-            match this.confirm_candidate(&obligation, candidate.clone()) {
+        let mut result = self.evaluation_probe(|this| {
+            match this.confirm_candidate(stack.obligation, candidate.clone()) {
                 Ok(selection) => {
                     debug!(?selection);
                     this.evaluate_predicates_recursively(
@@ -1731,19 +1694,14 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             })
             .map_err(|_| ())
     }
+
     fn where_clause_may_apply<'o>(
         &mut self,
         stack: &TraitObligationStack<'o, 'tcx>,
         where_clause_trait_ref: ty::PolyTraitRef<'tcx>,
     ) -> Result<EvaluationResult, OverflowError> {
-        self.evaluation_probe(|this, outer_universe| {
-            // Eagerly instantiate higher ranked goals.
-            //
-            // See the comment in `evaluate_candidate` to see why.
-            let p = self.infcx.enter_forall_and_leak_universe(stack.obligation.predicate);
-            let obligation = stack.obligation.with(this.tcx(), ty::Binder::dummy(p));
-            *outer_universe = self.infcx.universe();
-            match this.match_where_clause_trait_ref(&obligation, where_clause_trait_ref) {
+        self.evaluation_probe(|this| {
+            match this.match_where_clause_trait_ref(stack.obligation, where_clause_trait_ref) {
                 Ok(obligations) => this.evaluate_predicates_recursively(stack.list(), obligations),
                 Err(()) => Ok(EvaluatedToErr),
             }
diff --git a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
index c9bb0d330e1fd..6a904ef487eae 100644
--- a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
@@ -14,6 +14,7 @@ use rustc_infer::infer::DefineOpaqueTypes;
 use rustc_middle::ty::print::PrintTraitRefExt as _;
 use specialization_graph::GraphExt;
 
+use crate::error_reporting::traits::to_pretty_impl_header;
 use crate::errors::NegativePositiveConflict;
 use crate::infer::{InferCtxt, InferOk, TyCtxtInferExt};
 use crate::traits::select::IntercrateAmbiguityCause;
@@ -25,8 +26,8 @@ use rustc_errors::{codes::*, Diag, EmissionGuarantee};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::bug;
 use rustc_middle::query::LocalCrate;
+use rustc_middle::ty::GenericArgsRef;
 use rustc_middle::ty::{self, ImplSubject, Ty, TyCtxt, TypeVisitableExt};
-use rustc_middle::ty::{GenericArgs, GenericArgsRef};
 use rustc_session::lint::builtin::COHERENCE_LEAK_CHECK;
 use rustc_session::lint::builtin::ORDER_DEPENDENT_TRAIT_OBJECTS;
 use rustc_span::{sym, ErrorGuaranteed, Span, DUMMY_SP};
@@ -485,61 +486,3 @@ fn report_conflicting_impls<'tcx>(
         }
     }
 }
-
-/// Recovers the "impl X for Y" signature from `impl_def_id` and returns it as a
-/// string.
-pub(crate) fn to_pretty_impl_header(tcx: TyCtxt<'_>, impl_def_id: DefId) -> Option<String> {
-    use std::fmt::Write;
-
-    let trait_ref = tcx.impl_trait_ref(impl_def_id)?.instantiate_identity();
-    let mut w = "impl".to_owned();
-
-    let args = GenericArgs::identity_for_item(tcx, impl_def_id);
-
-    // FIXME: Currently only handles ?Sized.
-    //        Needs to support ?Move and ?DynSized when they are implemented.
-    let mut types_without_default_bounds = FxIndexSet::default();
-    let sized_trait = tcx.lang_items().sized_trait();
-
-    let arg_names = args.iter().map(|k| k.to_string()).filter(|k| k != "'_").collect::<Vec<_>>();
-    if !arg_names.is_empty() {
-        types_without_default_bounds.extend(args.types());
-        w.push('<');
-        w.push_str(&arg_names.join(", "));
-        w.push('>');
-    }
-
-    write!(
-        w,
-        " {} for {}",
-        trait_ref.print_only_trait_path(),
-        tcx.type_of(impl_def_id).instantiate_identity()
-    )
-    .unwrap();
-
-    // The predicates will contain default bounds like `T: Sized`. We need to
-    // remove these bounds, and add `T: ?Sized` to any untouched type parameters.
-    let predicates = tcx.predicates_of(impl_def_id).predicates;
-    let mut pretty_predicates =
-        Vec::with_capacity(predicates.len() + types_without_default_bounds.len());
-
-    for (p, _) in predicates {
-        if let Some(poly_trait_ref) = p.as_trait_clause() {
-            if Some(poly_trait_ref.def_id()) == sized_trait {
-                // FIXME(#120456) - is `swap_remove` correct?
-                types_without_default_bounds.swap_remove(&poly_trait_ref.self_ty().skip_binder());
-                continue;
-            }
-        }
-        pretty_predicates.push(p.to_string());
-    }
-
-    pretty_predicates.extend(types_without_default_bounds.iter().map(|ty| format!("{ty}: ?Sized")));
-
-    if !pretty_predicates.is_empty() {
-        write!(w, "\n  where {}", pretty_predicates.join(", ")).unwrap();
-    }
-
-    w.push(';');
-    Some(w)
-}
diff --git a/compiler/rustc_traits/src/codegen.rs b/compiler/rustc_traits/src/codegen.rs
index c73ececd1d150..3ee5fd876ff57 100644
--- a/compiler/rustc_traits/src/codegen.rs
+++ b/compiler/rustc_traits/src/codegen.rs
@@ -7,7 +7,7 @@ use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::bug;
 use rustc_middle::traits::CodegenObligationError;
 use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt};
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtOverflowExt;
 use rustc_trait_selection::traits::{
     ImplSource, Obligation, ObligationCause, ObligationCtxt, ScrubbedTraitError, SelectionContext,
     Unimplemented,
diff --git a/compiler/rustc_traits/src/normalize_projection_ty.rs b/compiler/rustc_traits/src/normalize_projection_ty.rs
index 0430e0bb70eb3..2d70fdc3935fb 100644
--- a/compiler/rustc_traits/src/normalize_projection_ty.rs
+++ b/compiler/rustc_traits/src/normalize_projection_ty.rs
@@ -2,8 +2,8 @@ use rustc_infer::infer::canonical::{Canonical, QueryResponse};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
+use rustc_trait_selection::error_reporting::traits::TypeErrCtxtOverflowExt;
 use rustc_trait_selection::infer::InferCtxtBuilderExt;
-use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 use rustc_trait_selection::traits::query::{
     normalize::NormalizationResult, CanonicalAliasGoal, NoSolution,
 };
diff --git a/compiler/rustc_ty_utils/src/abi.rs b/compiler/rustc_ty_utils/src/abi.rs
index f078cfe1b2505..4eb7b58bff9fb 100644
--- a/compiler/rustc_ty_utils/src/abi.rs
+++ b/compiler/rustc_ty_utils/src/abi.rs
@@ -324,7 +324,7 @@ fn fn_sig_for_fn_abi<'tcx>(
 #[inline]
 fn conv_from_spec_abi(tcx: TyCtxt<'_>, abi: SpecAbi, c_variadic: bool) -> Conv {
     use rustc_target::spec::abi::Abi::*;
-    match tcx.sess.target.adjust_abi(&tcx, abi, c_variadic) {
+    match tcx.sess.target.adjust_abi(abi, c_variadic) {
         RustIntrinsic | Rust | RustCall => Conv::Rust,
 
         // This is intentionally not using `Conv::Cold`, as that has to preserve
@@ -352,7 +352,6 @@ fn conv_from_spec_abi(tcx: TyCtxt<'_>, abi: SpecAbi, c_variadic: bool) -> Conv {
         AvrNonBlockingInterrupt => Conv::AvrNonBlockingInterrupt,
         RiscvInterruptM => Conv::RiscvInterrupt { kind: RiscvInterruptKind::Machine },
         RiscvInterruptS => Conv::RiscvInterrupt { kind: RiscvInterruptKind::Supervisor },
-        Wasm => Conv::C,
 
         // These API constants ought to be more specific...
         Cdecl { .. } => Conv::C,
diff --git a/compiler/rustc_type_ir/src/flags.rs b/compiler/rustc_type_ir/src/flags.rs
index 6a1ac642b70f7..81aa4a1f19ee0 100644
--- a/compiler/rustc_type_ir/src/flags.rs
+++ b/compiler/rustc_type_ir/src/flags.rs
@@ -14,7 +14,7 @@ bitflags::bitflags! {
         /// Does this have `ConstKind::Param`?
         const HAS_CT_PARAM                = 1 << 2;
 
-        const HAS_PARAM                 = TypeFlags::HAS_TY_PARAM.bits()
+        const HAS_PARAM                   = TypeFlags::HAS_TY_PARAM.bits()
                                           | TypeFlags::HAS_RE_PARAM.bits()
                                           | TypeFlags::HAS_CT_PARAM.bits();
 
@@ -27,7 +27,7 @@ bitflags::bitflags! {
 
         /// Does this have inference variables? Used to determine whether
         /// inference is required.
-        const HAS_INFER                 = TypeFlags::HAS_TY_INFER.bits()
+        const HAS_INFER                   = TypeFlags::HAS_TY_INFER.bits()
                                           | TypeFlags::HAS_RE_INFER.bits()
                                           | TypeFlags::HAS_CT_INFER.bits();
 
@@ -39,7 +39,7 @@ bitflags::bitflags! {
         const HAS_CT_PLACEHOLDER          = 1 << 8;
 
         /// Does this have placeholders?
-        const HAS_PLACEHOLDER           = TypeFlags::HAS_TY_PLACEHOLDER.bits()
+        const HAS_PLACEHOLDER             = TypeFlags::HAS_TY_PLACEHOLDER.bits()
                                           | TypeFlags::HAS_RE_PLACEHOLDER.bits()
                                           | TypeFlags::HAS_CT_PLACEHOLDER.bits();
 
@@ -81,7 +81,7 @@ bitflags::bitflags! {
         /// Does this have `Alias` or `ConstKind::Unevaluated`?
         ///
         /// Rephrased, could this term be normalized further?
-        const HAS_ALIASES              = TypeFlags::HAS_TY_PROJECTION.bits()
+        const HAS_ALIAS                   = TypeFlags::HAS_TY_PROJECTION.bits()
                                           | TypeFlags::HAS_TY_WEAK.bits()
                                           | TypeFlags::HAS_TY_OPAQUE.bits()
                                           | TypeFlags::HAS_TY_INHERENT.bits()
diff --git a/compiler/rustc_type_ir/src/visit.rs b/compiler/rustc_type_ir/src/visit.rs
index 473a0aa250ffc..25eb56fe3fb51 100644
--- a/compiler/rustc_type_ir/src/visit.rs
+++ b/compiler/rustc_type_ir/src/visit.rs
@@ -230,7 +230,7 @@ pub trait TypeVisitableExt<I: Interner>: TypeVisitable<I> {
     }
 
     fn has_aliases(&self) -> bool {
-        self.has_type_flags(TypeFlags::HAS_ALIASES)
+        self.has_type_flags(TypeFlags::HAS_ALIAS)
     }
 
     fn has_inherent_projections(&self) -> bool {
diff --git a/compiler/stable_mir/src/ty.rs b/compiler/stable_mir/src/ty.rs
index 01e4f1d1f33bc..9b912d1607426 100644
--- a/compiler/stable_mir/src/ty.rs
+++ b/compiler/stable_mir/src/ty.rs
@@ -1045,7 +1045,6 @@ pub enum Abi {
     AvrInterrupt,
     AvrNonBlockingInterrupt,
     CCmseNonSecureCall,
-    Wasm,
     System { unwind: bool },
     RustIntrinsic,
     RustCall,
diff --git a/library/alloc/src/boxed.rs b/library/alloc/src/boxed.rs
index 1ec095a46f704..65bcb241e4aec 100644
--- a/library/alloc/src/boxed.rs
+++ b/library/alloc/src/boxed.rs
@@ -2374,7 +2374,7 @@ impl dyn Error + Send {
         let err: Box<dyn Error> = self;
         <dyn Error>::downcast(err).map_err(|s| unsafe {
             // Reapply the `Send` marker.
-            Box::from_raw(Box::into_raw(s) as *mut (dyn Error + Send))
+            mem::transmute::<Box<dyn Error>, Box<dyn Error + Send>>(s)
         })
     }
 }
@@ -2387,8 +2387,8 @@ impl dyn Error + Send + Sync {
     pub fn downcast<T: Error + 'static>(self: Box<Self>) -> Result<Box<T>, Box<Self>> {
         let err: Box<dyn Error> = self;
         <dyn Error>::downcast(err).map_err(|s| unsafe {
-            // Reapply the `Send + Sync` marker.
-            Box::from_raw(Box::into_raw(s) as *mut (dyn Error + Send + Sync))
+            // Reapply the `Send + Sync` markers.
+            mem::transmute::<Box<dyn Error>, Box<dyn Error + Send + Sync>>(s)
         })
     }
 }
diff --git a/library/alloc/src/collections/btree/map/tests.rs b/library/alloc/src/collections/btree/map/tests.rs
index 56620cf890db7..ba1f38dcc3e52 100644
--- a/library/alloc/src/collections/btree/map/tests.rs
+++ b/library/alloc/src/collections/btree/map/tests.rs
@@ -1796,18 +1796,18 @@ fn test_ord_absence() {
     }
 
     fn map_debug<K: Debug>(mut map: BTreeMap<K, ()>) {
-        format!("{map:?}");
-        format!("{:?}", map.iter());
-        format!("{:?}", map.iter_mut());
-        format!("{:?}", map.keys());
-        format!("{:?}", map.values());
-        format!("{:?}", map.values_mut());
+        let _ = format!("{map:?}");
+        let _ = format!("{:?}", map.iter());
+        let _ = format!("{:?}", map.iter_mut());
+        let _ = format!("{:?}", map.keys());
+        let _ = format!("{:?}", map.values());
+        let _ = format!("{:?}", map.values_mut());
         if true {
-            format!("{:?}", map.into_iter());
+            let _ = format!("{:?}", map.into_iter());
         } else if true {
-            format!("{:?}", map.into_keys());
+            let _ = format!("{:?}", map.into_keys());
         } else {
-            format!("{:?}", map.into_values());
+            let _ = format!("{:?}", map.into_values());
         }
     }
 
diff --git a/library/alloc/src/collections/btree/set/tests.rs b/library/alloc/src/collections/btree/set/tests.rs
index 688ce57e9da6a..48bf767413835 100644
--- a/library/alloc/src/collections/btree/set/tests.rs
+++ b/library/alloc/src/collections/btree/set/tests.rs
@@ -705,9 +705,9 @@ fn test_ord_absence() {
     }
 
     fn set_debug<K: Debug>(set: BTreeSet<K>) {
-        format!("{set:?}");
-        format!("{:?}", set.iter());
-        format!("{:?}", set.into_iter());
+        let _ = format!("{set:?}");
+        let _ = format!("{:?}", set.iter());
+        let _ = format!("{:?}", set.into_iter());
     }
 
     fn set_clone<K: Clone>(mut set: BTreeSet<K>) {
diff --git a/library/alloc/src/fmt.rs b/library/alloc/src/fmt.rs
index ae44cab8131b5..c6bba619ae646 100644
--- a/library/alloc/src/fmt.rs
+++ b/library/alloc/src/fmt.rs
@@ -12,6 +12,7 @@
 //! Some examples of the [`format!`] extension are:
 //!
 //! ```
+//! # #![allow(unused_must_use)]
 //! format!("Hello");                 // => "Hello"
 //! format!("Hello, {}!", "world");   // => "Hello, world!"
 //! format!("The number is {}", 1);   // => "The number is 1"
@@ -50,6 +51,7 @@
 //! the iterator advances. This leads to behavior like this:
 //!
 //! ```
+//! # #![allow(unused_must_use)]
 //! format!("{1} {} {0} {}", 1, 2); // => "2 1 1 2"
 //! ```
 //!
@@ -77,6 +79,7 @@
 //! For example, the following [`format!`] expressions all use named arguments:
 //!
 //! ```
+//! # #![allow(unused_must_use)]
 //! format!("{argument}", argument = "test");   // => "test"
 //! format!("{name} {}", 1, name = 2);          // => "2 1"
 //! format!("{a} {c} {b}", a="a", b='b', c=3);  // => "a 3 b"
@@ -86,6 +89,7 @@
 //! reference a variable with that name in the current scope.
 //!
 //! ```
+//! # #![allow(unused_must_use)]
 //! let argument = 2 + 2;
 //! format!("{argument}");   // => "4"
 //!
diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index 3237d8654c281..a7715740cbd8f 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -257,6 +257,7 @@ pub mod vec;
 #[unstable(feature = "liballoc_internals", issue = "none", reason = "implementation detail")]
 pub mod __export {
     pub use core::format_args;
+    pub use core::hint::must_use;
 }
 
 #[cfg(test)]
diff --git a/library/alloc/src/macros.rs b/library/alloc/src/macros.rs
index d5ca5c4ed27a2..8c6a367869ce0 100644
--- a/library/alloc/src/macros.rs
+++ b/library/alloc/src/macros.rs
@@ -111,6 +111,7 @@ macro_rules! vec {
 /// # Examples
 ///
 /// ```
+/// # #![allow(unused_must_use)]
 /// format!("test");                             // => "test"
 /// format!("hello {}", "world!");               // => "hello world!"
 /// format!("x = {}, y = {val}", 10, val = 30);  // => "x = 10, y = 30"
@@ -119,10 +120,13 @@ macro_rules! vec {
 /// ```
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[allow_internal_unstable(hint_must_use, liballoc_internals)]
 #[cfg_attr(not(test), rustc_diagnostic_item = "format_macro")]
 macro_rules! format {
-    ($($arg:tt)*) => {{
-        let res = $crate::fmt::format($crate::__export::format_args!($($arg)*));
-        res
-    }}
+    ($($arg:tt)*) => {
+        $crate::__export::must_use({
+            let res = $crate::fmt::format($crate::__export::format_args!($($arg)*));
+            res
+        })
+    }
 }
diff --git a/library/alloc/src/slice/tests.rs b/library/alloc/src/slice/tests.rs
index 0156b9928dab4..0b972a13898eb 100644
--- a/library/alloc/src/slice/tests.rs
+++ b/library/alloc/src/slice/tests.rs
@@ -240,6 +240,7 @@ fn panic_safe() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri is too slow
+#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
 fn test_sort() {
     let mut rng = test_rng();
 
diff --git a/library/alloc/tests/fmt.rs b/library/alloc/tests/fmt.rs
index 379e09ab69a3c..ce24a40f4c051 100644
--- a/library/alloc/tests/fmt.rs
+++ b/library/alloc/tests/fmt.rs
@@ -217,19 +217,19 @@ fn test_format_macro_interface() {
 
     // make sure that format! doesn't move out of local variables
     let a = Box::new(3);
-    format!("{a}");
-    format!("{a}");
+    let _ = format!("{a}");
+    let _ = format!("{a}");
 
     // make sure that format! doesn't cause spurious unused-unsafe warnings when
     // it's inside of an outer unsafe block
     unsafe {
         let a: isize = ::std::mem::transmute(3_usize);
-        format!("{a}");
+        let _ = format!("{a}");
     }
 
     // test that trailing commas are acceptable
-    format!("{}", "test",);
-    format!("{foo}", foo = "test",);
+    let _ = format!("{}", "test",);
+    let _ = format!("{foo}", foo = "test",);
 }
 
 // Basic test to make sure that we can invoke the `write!` macro with an
diff --git a/library/core/src/borrow.rs b/library/core/src/borrow.rs
index bc026d0a44634..ccb1cc4e974d6 100644
--- a/library/core/src/borrow.rs
+++ b/library/core/src/borrow.rs
@@ -184,6 +184,7 @@ pub trait Borrow<Borrowed: ?Sized> {
 /// an underlying type by providing a mutable reference. See [`Borrow<T>`]
 /// for more information on borrowing as another type.
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_diagnostic_item = "BorrowMut"]
 pub trait BorrowMut<Borrowed: ?Sized>: Borrow<Borrowed> {
     /// Mutably borrows from an owned value.
     ///
diff --git a/library/core/src/cell/lazy.rs b/library/core/src/cell/lazy.rs
index 7c7130ec075e9..21452d40f9ded 100644
--- a/library/core/src/cell/lazy.rs
+++ b/library/core/src/cell/lazy.rs
@@ -67,7 +67,7 @@ impl<T, F: FnOnce() -> T> LazyCell<T, F> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(lazy_cell_consume)]
+    /// #![feature(lazy_cell_into_inner)]
     ///
     /// use std::cell::LazyCell;
     ///
@@ -78,7 +78,7 @@ impl<T, F: FnOnce() -> T> LazyCell<T, F> {
     /// assert_eq!(&*lazy, "HELLO, WORLD!");
     /// assert_eq!(LazyCell::into_inner(lazy).ok(), Some("HELLO, WORLD!".to_string()));
     /// ```
-    #[unstable(feature = "lazy_cell_consume", issue = "125623")]
+    #[unstable(feature = "lazy_cell_into_inner", issue = "125623")]
     pub fn into_inner(this: Self) -> Result<T, F> {
         match this.state.into_inner() {
             State::Init(data) => Ok(data),
diff --git a/library/core/src/error.rs b/library/core/src/error.rs
index 150e4f3f31857..ca8983d4cbcfe 100644
--- a/library/core/src/error.rs
+++ b/library/core/src/error.rs
@@ -1008,8 +1008,15 @@ impl<'a> Iterator for Source<'a> {
         self.current = self.current.and_then(Error::source);
         current
     }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        if self.current.is_some() { (1, None) } else { (0, Some(0)) }
+    }
 }
 
+#[unstable(feature = "error_iter", issue = "58520")]
+impl<'a> crate::iter::FusedIterator for Source<'a> {}
+
 #[stable(feature = "error_by_ref", since = "1.51.0")]
 impl<'a, T: Error + ?Sized> Error for &'a T {
     #[allow(deprecated, deprecated_in_future)]
diff --git a/library/core/src/num/f16.rs b/library/core/src/num/f16.rs
index 3c58b0af9c27e..0e54d78231da8 100644
--- a/library/core/src/num/f16.rs
+++ b/library/core/src/num/f16.rs
@@ -353,12 +353,15 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
+    /// # // FIXME(f16_f128): LLVM crashes on s390x, llvm/llvm-project#50374
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let f = 7.0_f16;
     /// let g = -7.0_f16;
     ///
     /// assert!(f.is_sign_positive());
     /// assert!(!g.is_sign_positive());
+    /// # }
     /// ```
     #[inline]
     #[must_use]
@@ -376,12 +379,15 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
+    /// # // FIXME(f16_f128): LLVM crashes on s390x, llvm/llvm-project#50374
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let f = 7.0_f16;
     /// let g = -7.0_f16;
     ///
     /// assert!(!f.is_sign_negative());
     /// assert!(g.is_sign_negative());
+    /// # }
     /// ```
     #[inline]
     #[must_use]
@@ -507,8 +513,8 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
-    /// # // FIXME(f16_f128): remove when `extendhfsf2` and `truncsfhf2` are available
-    /// # #[cfg(target_os = "linux")] {
+    /// # // FIXME(f16_f128): extendhfsf2, truncsfhf2, __gnu_h2f_ieee, __gnu_f2h_ieee missing for many platforms
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let x = 2.0_f16;
     /// let abs_difference = (x.recip() - (1.0 / x)).abs();
@@ -528,8 +534,8 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
-    /// # // FIXME(f16_f128): remove when `extendhfsf2` and `truncsfhf2` are available
-    /// # #[cfg(target_os = "linux")] {
+    /// # // FIXME(f16_f128): extendhfsf2, truncsfhf2, __gnu_h2f_ieee, __gnu_f2h_ieee missing for many platforms
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let angle = std::f16::consts::PI;
     ///
@@ -551,8 +557,8 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
-    /// # // FIXME(f16_f128): remove when `extendhfsf2` and `truncsfhf2` are available
-    /// # #[cfg(target_os = "linux")] {
+    /// # // FIXME(f16_f128): extendhfsf2, truncsfhf2, __gnu_h2f_ieee, __gnu_f2h_ieee missing for many platforms
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let angle = 180.0f16;
     ///
@@ -694,9 +700,12 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
+    /// # // FIXME(f16_f128): LLVM crashes on s390x, llvm/llvm-project#50374
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let bytes = 12.5f16.to_be_bytes();
     /// assert_eq!(bytes, [0x4a, 0x40]);
+    /// # }
     /// ```
     #[inline]
     #[unstable(feature = "f16", issue = "116909")]
@@ -715,9 +724,12 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
+    /// # // FIXME(f16_f128): LLVM crashes on s390x, llvm/llvm-project#50374
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let bytes = 12.5f16.to_le_bytes();
     /// assert_eq!(bytes, [0x40, 0x4a]);
+    /// # }
     /// ```
     #[inline]
     #[unstable(feature = "f16", issue = "116909")]
@@ -742,6 +754,8 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
+    /// # // FIXME(f16_f128): LLVM crashes on s390x, llvm/llvm-project#50374
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// let bytes = 12.5f16.to_ne_bytes();
     /// assert_eq!(
@@ -752,6 +766,7 @@ impl f16 {
     ///         [0x40, 0x4a]
     ///     }
     /// );
+    /// # }
     /// ```
     #[inline]
     #[unstable(feature = "f16", issue = "116909")]
@@ -870,6 +885,8 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
+    /// # // FIXME(f16_f128): extendhfsf2, truncsfhf2, __gnu_h2f_ieee, __gnu_f2h_ieee missing for many platforms
+    /// # #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
     /// struct GoodBoy {
     ///     name: &'static str,
@@ -897,6 +914,7 @@ impl f16 {
     ///         .zip([-5.0, 0.1, 10.0, 99.0, f16::INFINITY, f16::NAN].iter())
     ///         .for_each(|(a, b)| assert_eq!(a.to_bits(), b.to_bits()))
     /// }
+    /// # }
     /// ```
     #[inline]
     #[must_use]
diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 521c324820446..68508e85f8e14 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -3959,17 +3959,8 @@ impl<T> [T] {
 
     /// Split a slice into a prefix, a middle of aligned SIMD types, and a suffix.
     ///
-    /// This is a safe wrapper around [`slice::align_to`], so has the same weak
-    /// postconditions as that method.  You're only assured that
-    /// `self.len() == prefix.len() + middle.len() * LANES + suffix.len()`.
-    ///
-    /// Notably, all of the following are possible:
-    /// - `prefix.len() >= LANES`.
-    /// - `middle.is_empty()` despite `self.len() >= 3 * LANES`.
-    /// - `suffix.len() >= LANES`.
-    ///
-    /// That said, this is a safe method, so if you're only writing safe code,
-    /// then this can at most cause incorrect logic, not unsoundness.
+    /// This is a safe wrapper around [`slice::align_to`], so inherits the same
+    /// guarantees as that method.
     ///
     /// # Panics
     ///
@@ -4033,17 +4024,8 @@ impl<T> [T] {
     /// Split a mutable slice into a mutable prefix, a middle of aligned SIMD types,
     /// and a mutable suffix.
     ///
-    /// This is a safe wrapper around [`slice::align_to_mut`], so has the same weak
-    /// postconditions as that method.  You're only assured that
-    /// `self.len() == prefix.len() + middle.len() * LANES + suffix.len()`.
-    ///
-    /// Notably, all of the following are possible:
-    /// - `prefix.len() >= LANES`.
-    /// - `middle.is_empty()` despite `self.len() >= 3 * LANES`.
-    /// - `suffix.len() >= LANES`.
-    ///
-    /// That said, this is a safe method, so if you're only writing safe code,
-    /// then this can at most cause incorrect logic, not unsoundness.
+    /// This is a safe wrapper around [`slice::align_to_mut`], so inherits the same
+    /// guarantees as that method.
     ///
     /// This is the mutable version of [`slice::as_simd`]; see that for examples.
     ///
diff --git a/library/core/tests/fmt/builders.rs b/library/core/tests/fmt/builders.rs
index 487ce46be28d7..2bdc334b7c027 100644
--- a/library/core/tests/fmt/builders.rs
+++ b/library/core/tests/fmt/builders.rs
@@ -441,7 +441,7 @@ mod debug_map {
             }
         }
 
-        format!("{Foo:?}");
+        let _ = format!("{Foo:?}");
     }
 
     #[test]
@@ -455,7 +455,7 @@ mod debug_map {
             }
         }
 
-        format!("{Foo:?}");
+        let _ = format!("{Foo:?}");
     }
 
     #[test]
@@ -469,7 +469,7 @@ mod debug_map {
             }
         }
 
-        format!("{Foo:?}");
+        let _ = format!("{Foo:?}");
     }
 }
 
diff --git a/library/std/build.rs b/library/std/build.rs
index 55388648a14b9..c542ba81eedc1 100644
--- a/library/std/build.rs
+++ b/library/std/build.rs
@@ -99,7 +99,9 @@ fn main() {
         // the compiler-builtins update. <https://github.com/rust-lang/rust/issues/123885>
         ("x86" | "x86_64", _) => false,
         // Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee`
-        ("powerpc" | "powerpc64" | "powerpc64le", _) => false,
+        ("powerpc" | "powerpc64", _) => false,
+        // Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee`
+        ("mips" | "mips32r6" | "mips64" | "mips64r6", _) => false,
         // Missing `__extendhfsf` and `__truncsfhf`
         ("riscv32" | "riscv64", _) => false,
         // Most OSs are missing `__extendhfsf` and `__truncsfhf`
diff --git a/library/std/src/os/fd/owned.rs b/library/std/src/os/fd/owned.rs
index 8c7fc4cb2e453..a1f83029d2727 100644
--- a/library/std/src/os/fd/owned.rs
+++ b/library/std/src/os/fd/owned.rs
@@ -175,6 +175,11 @@ impl Drop for OwnedFd {
             // the file descriptor was closed or not, and if we retried (for
             // something like EINTR), we might close another valid file descriptor
             // opened after we closed ours.
+            // However, this is usually justified, as some of the major Unices
+            // do make sure to always close the FD, even when `close()` is interrupted,
+            // and the scenario is rare to begin with.
+            // Helpful link to an epic discussion by POSIX workgroup:
+            // http://austingroupbugs.net/view.php?id=529
             #[cfg(not(target_os = "hermit"))]
             {
                 #[cfg(unix)]
diff --git a/library/std/src/os/windows/process.rs b/library/std/src/os/windows/process.rs
index 9cca27fa5dd5b..05ffb8925a1f0 100644
--- a/library/std/src/os/windows/process.rs
+++ b/library/std/src/os/windows/process.rs
@@ -181,6 +181,14 @@ pub trait CommandExt: Sealed {
     #[stable(feature = "windows_process_extensions", since = "1.16.0")]
     fn creation_flags(&mut self, flags: u32) -> &mut process::Command;
 
+    /// Sets the field `wShowWindow` of [STARTUPINFO][1] that is passed to `CreateProcess`.
+    /// Allowed values are the ones listed in
+    /// <https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-showwindow>
+    ///
+    /// [1]: <https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/ns-processthreadsapi-startupinfow>
+    #[unstable(feature = "windows_process_extensions_show_window", issue = "127544")]
+    fn show_window(&mut self, cmd_show: u16) -> &mut process::Command;
+
     /// Forces all arguments to be wrapped in quote (`"`) characters.
     ///
     /// This is useful for passing arguments to [MSYS2/Cygwin][1] based
@@ -370,6 +378,11 @@ impl CommandExt for process::Command {
         self
     }
 
+    fn show_window(&mut self, cmd_show: u16) -> &mut process::Command {
+        self.as_inner_mut().show_window(Some(cmd_show));
+        self
+    }
+
     fn force_quotes(&mut self, enabled: bool) -> &mut process::Command {
         self.as_inner_mut().force_quotes(enabled);
         self
diff --git a/library/std/src/process/tests.rs b/library/std/src/process/tests.rs
index 63455a274faaa..b4f6bb71c79c4 100644
--- a/library/std/src/process/tests.rs
+++ b/library/std/src/process/tests.rs
@@ -386,7 +386,7 @@ fn test_interior_nul_in_env_value_is_error() {
 fn test_creation_flags() {
     use crate::os::windows::process::CommandExt;
     use crate::sys::c::{BOOL, DWORD, INFINITE};
-    #[repr(C, packed)]
+    #[repr(C)]
     struct DEBUG_EVENT {
         pub event_code: DWORD,
         pub process_id: DWORD,
diff --git a/library/std/src/sync/lazy_lock.rs b/library/std/src/sync/lazy_lock.rs
index b70c041fa4283..18906aceffa30 100644
--- a/library/std/src/sync/lazy_lock.rs
+++ b/library/std/src/sync/lazy_lock.rs
@@ -107,7 +107,7 @@ impl<T, F: FnOnce() -> T> LazyLock<T, F> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(lazy_cell_consume)]
+    /// #![feature(lazy_cell_into_inner)]
     ///
     /// use std::sync::LazyLock;
     ///
@@ -118,7 +118,7 @@ impl<T, F: FnOnce() -> T> LazyLock<T, F> {
     /// assert_eq!(&*lazy, "HELLO, WORLD!");
     /// assert_eq!(LazyLock::into_inner(lazy).ok(), Some("HELLO, WORLD!".to_string()));
     /// ```
-    #[unstable(feature = "lazy_cell_consume", issue = "125623")]
+    #[unstable(feature = "lazy_cell_into_inner", issue = "125623")]
     pub fn into_inner(mut this: Self) -> Result<T, F> {
         let state = this.once.state();
         match state {
diff --git a/library/std/src/sys/pal/windows/process.rs b/library/std/src/sys/pal/windows/process.rs
index 2da986a1494ef..c62764696b86b 100644
--- a/library/std/src/sys/pal/windows/process.rs
+++ b/library/std/src/sys/pal/windows/process.rs
@@ -163,6 +163,7 @@ pub struct Command {
     env: CommandEnv,
     cwd: Option<OsString>,
     flags: u32,
+    show_window: Option<u16>,
     detach: bool, // not currently exposed in std::process
     stdin: Option<Stdio>,
     stdout: Option<Stdio>,
@@ -194,6 +195,7 @@ impl Command {
             env: Default::default(),
             cwd: None,
             flags: 0,
+            show_window: None,
             detach: false,
             stdin: None,
             stdout: None,
@@ -224,6 +226,9 @@ impl Command {
     pub fn creation_flags(&mut self, flags: u32) {
         self.flags = flags;
     }
+    pub fn show_window(&mut self, cmd_show: Option<u16>) {
+        self.show_window = cmd_show;
+    }
 
     pub fn force_quotes(&mut self, enabled: bool) {
         self.force_quotes_enabled = enabled;
@@ -337,6 +342,11 @@ impl Command {
             si.hStdError = stderr.as_raw_handle();
         }
 
+        if let Some(cmd_show) = self.show_window {
+            si.dwFlags |= c::STARTF_USESHOWWINDOW;
+            si.wShowWindow = cmd_show;
+        }
+
         let si_ptr: *mut c::STARTUPINFOW;
 
         let mut proc_thread_attribute_list;
diff --git a/src/bootstrap/Cargo.lock b/src/bootstrap/Cargo.lock
index 9c24742cff1fc..c095127da1404 100644
--- a/src/bootstrap/Cargo.lock
+++ b/src/bootstrap/Cargo.lock
@@ -54,7 +54,6 @@ dependencies = [
  "junction",
  "libc",
  "object",
- "once_cell",
  "opener",
  "pretty_assertions",
  "semver",
diff --git a/src/bootstrap/Cargo.toml b/src/bootstrap/Cargo.toml
index 32dd3efa7a6e7..df7b5b881931f 100644
--- a/src/bootstrap/Cargo.toml
+++ b/src/bootstrap/Cargo.toml
@@ -49,7 +49,6 @@ home = "0.5"
 ignore = "0.4"
 libc = "0.2"
 object = { version = "0.32", default-features = false, features = ["archive", "coff", "read_core", "unaligned"] }
-once_cell = "1.19"
 opener = "0.5"
 semver = "1.0"
 serde = "1.0"
diff --git a/src/bootstrap/bootstrap_test.py b/src/bootstrap/bootstrap_test.py
index 6da410ed2f279..706f2c5bf0701 100644
--- a/src/bootstrap/bootstrap_test.py
+++ b/src/bootstrap/bootstrap_test.py
@@ -138,6 +138,25 @@ def build_args(self, configure_args=None, args=None, env=None):
         if env is None:
             env = {}
 
+        # This test ends up invoking build_bootstrap_cmd, which searches for
+        # the Cargo binary and errors out if it cannot be found. This is not a
+        # problem in most cases, but there is a scenario where it would cause
+        # the test to fail.
+        #
+        # When a custom local Cargo is configured in config.toml (with the
+        # build.cargo setting), no Cargo is downloaded to any location known by
+        # bootstrap, and bootstrap relies on that setting to find it.
+        #
+        # In this test though we are not using the config.toml of the caller:
+        # we are generating a blank one instead. If we don't set build.cargo in
+        # it, the test will have no way to find Cargo, failing the test.
+        cargo_bin = os.environ.get("BOOTSTRAP_TEST_CARGO_BIN")
+        if cargo_bin is not None:
+            configure_args += ["--set", "build.cargo=" + cargo_bin]
+        rustc_bin = os.environ.get("BOOTSTRAP_TEST_RUSTC_BIN")
+        if rustc_bin is not None:
+            configure_args += ["--set", "build.rustc=" + rustc_bin]
+
         env = env.copy()
         env["PATH"] = os.environ["PATH"]
 
diff --git a/src/bootstrap/src/core/build_steps/llvm.rs b/src/bootstrap/src/core/build_steps/llvm.rs
index bff731e13b0a9..872823506f883 100644
--- a/src/bootstrap/src/core/build_steps/llvm.rs
+++ b/src/bootstrap/src/core/build_steps/llvm.rs
@@ -753,7 +753,7 @@ fn configure_cmake(
     }
 
     if builder.config.llvm_clang_cl.is_some() {
-        cflags.push(&format!(" --target={target}"));
+        cflags.push(format!(" --target={target}"));
     }
     cfg.define("CMAKE_C_FLAGS", cflags);
     let mut cxxflags: OsString = builder
@@ -772,7 +772,7 @@ fn configure_cmake(
         cxxflags.push(s);
     }
     if builder.config.llvm_clang_cl.is_some() {
-        cxxflags.push(&format!(" --target={target}"));
+        cxxflags.push(format!(" --target={target}"));
     }
     cfg.define("CMAKE_CXX_FLAGS", cxxflags);
     if let Some(ar) = builder.ar(target) {
@@ -913,7 +913,7 @@ impl Step for Lld {
                 // Find clang's runtime library directory and push that as a search path to the
                 // cmake linker flags.
                 let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
-                ldflags.push_all(&format!("/libpath:{}", clang_rt_dir.display()));
+                ldflags.push_all(format!("/libpath:{}", clang_rt_dir.display()));
             }
         }
 
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 7f4c4bd53dffa..0b60587bb792b 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -2979,6 +2979,8 @@ impl Step for Bootstrap {
             .args(["-m", "unittest", "bootstrap_test.py"])
             .env("BUILD_DIR", &builder.out)
             .env("BUILD_PLATFORM", builder.build.build.triple)
+            .env("BOOTSTRAP_TEST_RUSTC_BIN", &builder.initial_rustc)
+            .env("BOOTSTRAP_TEST_CARGO_BIN", &builder.initial_cargo)
             .current_dir(builder.src.join("src/bootstrap/"));
         // NOTE: we intentionally don't pass test_args here because the args for unittest and cargo test are mutually incompatible.
         // Use `python -m unittest` manually if you want to pass arguments.
diff --git a/src/bootstrap/src/core/builder.rs b/src/bootstrap/src/core/builder.rs
index 24bb96c6b88f2..65cc1fa74782a 100644
--- a/src/bootstrap/src/core/builder.rs
+++ b/src/bootstrap/src/core/builder.rs
@@ -8,6 +8,7 @@ use std::fs;
 use std::hash::Hash;
 use std::ops::Deref;
 use std::path::{Path, PathBuf};
+use std::sync::LazyLock;
 use std::time::{Duration, Instant};
 
 use crate::core::build_steps::tool::{self, SourceType};
@@ -27,8 +28,6 @@ use crate::utils::exec::{command, BootstrapCommand};
 pub use crate::Compiler;
 
 use clap::ValueEnum;
-// FIXME: replace with std::lazy after it gets stabilized and reaches beta
-use once_cell::sync::Lazy;
 
 #[cfg(test)]
 mod tests;
@@ -498,7 +497,7 @@ impl StepDescription {
 
 enum ReallyDefault<'a> {
     Bool(bool),
-    Lazy(Lazy<bool, Box<dyn Fn() -> bool + 'a>>),
+    Lazy(LazyLock<bool, Box<dyn Fn() -> bool + 'a>>),
 }
 
 pub struct ShouldRun<'a> {
@@ -529,7 +528,7 @@ impl<'a> ShouldRun<'a> {
     }
 
     pub fn lazy_default_condition(mut self, lazy_cond: Box<dyn Fn() -> bool + 'a>) -> Self {
-        self.is_really_default = ReallyDefault::Lazy(Lazy::new(lazy_cond));
+        self.is_really_default = ReallyDefault::Lazy(LazyLock::new(lazy_cond));
         self
     }
 
@@ -2526,7 +2525,7 @@ impl Cargo {
 
         if let Some(target_linker) = builder.linker(target) {
             let target = crate::envify(&target.triple);
-            self.command.env(&format!("CARGO_TARGET_{target}_LINKER"), target_linker);
+            self.command.env(format!("CARGO_TARGET_{target}_LINKER"), target_linker);
         }
         // We want to set -Clinker using Cargo, therefore we only call `linker_flags` and not
         // `linker_args` here.
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index 10ac6c93e9a43..2d54a84331ff6 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -1330,6 +1330,17 @@ impl Config {
             TomlConfig::default()
         };
 
+        if cfg!(test) {
+            // When configuring bootstrap for tests, make sure to set the rustc and Cargo to the
+            // same ones used to call the tests (if custom ones are not defined in the toml). If we
+            // don't do that, bootstrap will use its own detection logic to find a suitable rustc
+            // and Cargo, which doesn't work when the caller is specìfying a custom local rustc or
+            // Cargo in their config.toml.
+            let build = toml.build.get_or_insert_with(Default::default);
+            build.rustc = build.rustc.take().or(std::env::var_os("RUSTC").map(|p| p.into()));
+            build.cargo = build.cargo.take().or(std::env::var_os("CARGO").map(|p| p.into()));
+        }
+
         if let Some(include) = &toml.profile {
             // Allows creating alias for profile names, allowing
             // profiles to be renamed while maintaining back compatibility
@@ -1448,7 +1459,12 @@ impl Config {
             rustc
         } else {
             config.download_beta_toolchain();
-            config.out.join(config.build.triple).join("stage0/bin/rustc")
+            config
+                .out
+                .join(config.build.triple)
+                .join("stage0")
+                .join("bin")
+                .join(exe("rustc", config.build))
         };
 
         config.initial_cargo = if let Some(cargo) = cargo {
@@ -1458,7 +1474,12 @@ impl Config {
             cargo
         } else {
             config.download_beta_toolchain();
-            config.out.join(config.build.triple).join("stage0/bin/cargo")
+            config
+                .out
+                .join(config.build.triple)
+                .join("stage0")
+                .join("bin")
+                .join(exe("cargo", config.build))
         };
 
         // NOTE: it's important this comes *after* we set `initial_rustc` just above.
diff --git a/src/bootstrap/src/utils/cache.rs b/src/bootstrap/src/utils/cache.rs
index e18dcbb47bea0..d60b54dc703f2 100644
--- a/src/bootstrap/src/utils/cache.rs
+++ b/src/bootstrap/src/utils/cache.rs
@@ -9,10 +9,7 @@ use std::marker::PhantomData;
 use std::mem;
 use std::ops::Deref;
 use std::path::PathBuf;
-use std::sync::Mutex;
-
-// FIXME: replace with std::lazy after it gets stabilized and reaches beta
-use once_cell::sync::Lazy;
+use std::sync::{LazyLock, Mutex};
 
 use crate::core::builder::Step;
 
@@ -196,7 +193,7 @@ impl Interner {
     }
 }
 
-pub static INTERNER: Lazy<Interner> = Lazy::new(Interner::default);
+pub static INTERNER: LazyLock<Interner> = LazyLock::new(Interner::default);
 
 /// This is essentially a `HashMap` which allows storing any type in its input and
 /// any type in its output. It is a write-once cache; values are never evicted,
diff --git a/src/ci/docker/host-x86_64/dist-x86_64-linux/build-gccjit.sh b/src/ci/docker/host-x86_64/dist-x86_64-linux/build-gccjit.sh
index 5bc6f5cc2169b..4c80e895fd2f8 100755
--- a/src/ci/docker/host-x86_64/dist-x86_64-linux/build-gccjit.sh
+++ b/src/ci/docker/host-x86_64/dist-x86_64-linux/build-gccjit.sh
@@ -3,7 +3,7 @@
 GIT_REPO="https://github.com/rust-lang/gcc"
 
 # This commit hash needs to be updated to use a more recent gcc fork version.
-GIT_COMMIT="78dc50f0e50e6cd1433149520bd512a4e0eaa1bc"
+GIT_COMMIT="341be3b7d7ac6976cfed8ed59da3573c040d0776"
 
 set -ex
 
diff --git a/src/ci/docker/run.sh b/src/ci/docker/run.sh
index 695b8b4c0d9e1..40f421714118e 100755
--- a/src/ci/docker/run.sh
+++ b/src/ci/docker/run.sh
@@ -93,7 +93,7 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
     docker --version
 
     REGISTRY=ghcr.io
-    REGISTRY_USERNAME=${GITHUB_REPOSITORY_OWNER}
+    REGISTRY_USERNAME=${GITHUB_REPOSITORY_OWNER:-rust-lang-ci}
     # Tag used to push the final Docker image, so that it can be pulled by e.g. rustup
     IMAGE_TAG=${REGISTRY}/${REGISTRY_USERNAME}/rust-ci:${cksum}
     # Tag used to cache the Docker build
diff --git a/src/ci/docker/scripts/fuchsia-test-runner.py b/src/ci/docker/scripts/fuchsia-test-runner.py
index 6db25ff1a809e..00269e68422d3 100755
--- a/src/ci/docker/scripts/fuchsia-test-runner.py
+++ b/src/ci/docker/scripts/fuchsia-test-runner.py
@@ -8,8 +8,6 @@
 """
 
 import argparse
-from concurrent.futures import ThreadPoolExecutor
-from dataclasses import dataclass
 import glob
 import io
 import json
@@ -20,6 +18,8 @@
 import shutil
 import subprocess
 import sys
+from concurrent.futures import ThreadPoolExecutor
+from dataclasses import dataclass
 from pathlib import Path
 from typing import ClassVar, List, Optional
 
@@ -42,12 +42,8 @@ def exhaust_pipe(handler, pipe):
                 for line in pipe:
                     handler(line.rstrip())
 
-            executor_out = executor.submit(
-                exhaust_pipe, stdout_handler, process.stdout
-            )
-            executor_err = executor.submit(
-                exhaust_pipe, stderr_handler, process.stderr
-            )
+            executor_out = executor.submit(exhaust_pipe, stdout_handler, process.stdout)
+            executor_err = executor.submit(exhaust_pipe, stderr_handler, process.stderr)
             executor_out.result()
             executor_err.result()
     retcode = process.poll()
@@ -203,9 +199,7 @@ def build_id(self, binary):
             raise Exception(f"Unreadable build-id for binary {binary}")
         data = json.loads(process.stdout)
         if len(data) != 1:
-            raise Exception(
-                f"Unreadable output from llvm-readelf for binary {binary}"
-            )
+            raise Exception(f"Unreadable output from llvm-readelf for binary {binary}")
         notes = data[0]["Notes"]
         for note in notes:
             note_section = note["NoteSection"]
@@ -265,19 +259,10 @@ def write_to_file(self):
     def setup_logging(self, log_to_file=False):
         fs = logging.Formatter("%(asctime)s %(levelname)s:%(name)s:%(message)s")
         if log_to_file:
-            logfile_handler = logging.FileHandler(
-                self.tmp_dir().joinpath("log")
-            )
+            logfile_handler = logging.FileHandler(self.tmp_dir().joinpath("log"))
             logfile_handler.setLevel(logging.DEBUG)
             logfile_handler.setFormatter(fs)
             logging.getLogger().addHandler(logfile_handler)
-        stream_handler = logging.StreamHandler(sys.stdout)
-        stream_handler.setFormatter(fs)
-        if self.verbose:
-            stream_handler.setLevel(logging.DEBUG)
-        else:
-            stream_handler.setLevel(logging.INFO)
-        logging.getLogger().addHandler(stream_handler)
         logging.getLogger().setLevel(logging.DEBUG)
 
     @property
@@ -454,9 +439,7 @@ def start(self):
         # Initialize temp directory
         os.makedirs(self.tmp_dir(), exist_ok=True)
         if len(os.listdir(self.tmp_dir())) != 0:
-            raise Exception(
-                f"Temp directory is not clean (in {self.tmp_dir()})"
-            )
+            raise Exception(f"Temp directory is not clean (in {self.tmp_dir()})")
         self.setup_logging(log_to_file=True)
         os.mkdir(self.output_dir)
 
@@ -493,9 +476,7 @@ def start(self):
             shutil.rmtree(self.local_pb_path, ignore_errors=True)
 
             # Look up the product bundle transfer manifest.
-            self.env_logger.info(
-                "Looking up the product bundle transfer manifest..."
-            )
+            self.env_logger.info("Looking up the product bundle transfer manifest...")
             product_name = "minimal." + self.triple_to_arch(self.target)
             sdk_version = self.read_sdk_version()
 
@@ -517,9 +498,7 @@ def start(self):
             )
 
             try:
-                transfer_manifest_url = json.loads(output)[
-                    "transfer_manifest_url"
-                ]
+                transfer_manifest_url = json.loads(output)["transfer_manifest_url"]
             except Exception as e:
                 print(e)
                 raise Exception("Unable to parse transfer manifest") from e
@@ -769,9 +748,7 @@ def run(self, args):
             # Use /tmp as the test temporary directory
             env_vars += '\n            "RUST_TEST_TMPDIR=/tmp",'
 
-            cml.write(
-                self.CML_TEMPLATE.format(env_vars=env_vars, exe_name=exe_name)
-            )
+            cml.write(self.CML_TEMPLATE.format(env_vars=env_vars, exe_name=exe_name))
 
         runner_logger.info("Compiling CML...")
 
@@ -922,20 +899,16 @@ def run(self, args):
 
         if stdout_path is not None:
             if not os.path.exists(stdout_path):
-                runner_logger.error(
-                    f"stdout file {stdout_path} does not exist."
-                )
+                runner_logger.error(f"stdout file {stdout_path} does not exist.")
             else:
                 with open(stdout_path, encoding="utf-8", errors="ignore") as f:
-                    runner_logger.info(f.read())
+                    sys.stdout.write(f.read())
         if stderr_path is not None:
             if not os.path.exists(stderr_path):
-                runner_logger.error(
-                    f"stderr file {stderr_path} does not exist."
-                )
+                runner_logger.error(f"stderr file {stderr_path} does not exist.")
             else:
                 with open(stderr_path, encoding="utf-8", errors="ignore") as f:
-                    runner_logger.error(f.read())
+                    sys.stderr.write(f.read())
 
         runner_logger.info("Done!")
         return return_code
@@ -1037,7 +1010,7 @@ def debug(self, args):
                 f"--symbol-path={self.rust_dir}/lib/rustlib/{self.target}/lib",
             ]
 
-      # Add rust source if it's available
+        # Add rust source if it's available
         rust_src_map = None
         if args.rust_src is not None:
             # This matches the remapped prefix used by compiletest. There's no
@@ -1210,7 +1183,7 @@ def print_help(args):
     start_parser.add_argument(
         "--use-local-product-bundle-if-exists",
         help="if the product bundle already exists in the local path, use "
-            "it instead of downloading it again",
+        "it instead of downloading it again",
         action="store_true",
     )
     start_parser.set_defaults(func=start)
@@ -1246,9 +1219,7 @@ def print_help(args):
     )
     cleanup_parser.set_defaults(func=cleanup)
 
-    syslog_parser = subparsers.add_parser(
-        "syslog", help="prints the device syslog"
-    )
+    syslog_parser = subparsers.add_parser("syslog", help="prints the device syslog")
     syslog_parser.set_defaults(func=syslog)
 
     debug_parser = subparsers.add_parser(
diff --git a/src/doc/rustdoc/src/advanced-features.md b/src/doc/rustdoc/src/advanced-features.md
index 1733c8fc9a246..4a1c091625320 100644
--- a/src/doc/rustdoc/src/advanced-features.md
+++ b/src/doc/rustdoc/src/advanced-features.md
@@ -80,7 +80,8 @@ pub struct BigX;
 Then, when looking for it through the `rustdoc` search, if you enter "x" or
 "big", search will show the `BigX` struct first.
 
-There are some limitations on the doc alias names though: you can't use `"` or whitespace.
+There are some limitations on the doc alias names though: they cannot contain quotes (`'`, `"`)
+or most whitespace. ASCII space is allowed if it does not start or end the alias.
 
 You can add multiple aliases at the same time by using a list:
 
diff --git a/src/etc/natvis/intrinsic.natvis b/src/etc/natvis/intrinsic.natvis
index 8c16a562e349e..49e0ce319efac 100644
--- a/src/etc/natvis/intrinsic.natvis
+++ b/src/etc/natvis/intrinsic.natvis
@@ -33,6 +33,32 @@
       </ArrayItems>
     </Expand>
   </Type>
+  <Type Name="f16">
+    <Intrinsic Name="sign_mask" Expression="(unsigned __int16) 0x8000" />
+    <Intrinsic Name="exponent_mask" Expression="(unsigned __int16) 0x7c00" />
+    <Intrinsic Name="significand_mask" Expression="(unsigned __int16) 0x03ff" />
+    <Intrinsic Name="sign_bit" Expression="(unsigned __int16) (bits &amp; sign_mask())" />
+    <Intrinsic Name="exponent_bits" Expression="(unsigned __int16) (bits &amp; exponent_mask())" />
+    <Intrinsic Name="significand_bits" Expression="(unsigned __int16) (bits &amp; significand_mask())" />
+
+    <Intrinsic Name="if_set" Expression="(bits &amp; mask) != 0 ? value : 1.0">
+      <Parameter Name="mask" Type="unsigned __int16" />
+      <Parameter Name="value" Type="float" />
+    </Intrinsic>
+    <!-- Calculates 2**exp without needing a pow function. Each float in if_set() is the square of the previous float. 32768 == 2.pow(bias), bias == 15 -->
+    <Intrinsic Name="two_pow_exponent" Expression="if_set(0x0400, 2.0) * if_set(0x0800, 4.0) * if_set(0x1000, 16.0) * if_set(0x2000, 256.0) * if_set(0x4000, 65536.0) / 32768.0" />
+    <!-- Calculates 0.significand, without any implicit bit. 1024 == 2.pow(explicit significand width), explicit significand width == 10 -->
+    <Intrinsic Name="raw_significand" Expression="((float) significand_bits()) / 1024.0" />
+    <Intrinsic Name="sign" Expression="sign_bit() == 0 ? 1.0 : -1.0" />
+
+    <DisplayString Condition="bits == 0x7c00">inf</DisplayString>
+    <DisplayString Condition="bits == 0xfc00">-inf</DisplayString>
+    <DisplayString Condition="exponent_bits() == exponent_mask()">NaN</DisplayString>
+    <!-- Subnormal or zero (16384 == 2.pow(bias - 1), bias - 1 == 14) -->
+    <DisplayString Condition="exponent_bits() == 0">{(float) (sign() * raw_significand() / 16384.0)}</DisplayString>
+    <!-- Normal -->
+    <DisplayString>{(float) (sign() * (raw_significand() + 1.0) * two_pow_exponent())}</DisplayString>
+  </Type>
   <Type Name="tuple$&lt;&gt;">
     <DisplayString>()</DisplayString>
   </Type>
diff --git a/src/librustdoc/lint.rs b/src/librustdoc/lint.rs
index 8eaca70eaff48..5a8fd3ebb9c83 100644
--- a/src/librustdoc/lint.rs
+++ b/src/librustdoc/lint.rs
@@ -66,7 +66,7 @@ where
 macro_rules! declare_rustdoc_lint {
     (
         $(#[$attr:meta])* $name: ident, $level: ident, $descr: literal $(,)?
-        $(@feature_gate = $gate:expr;)?
+        $(@feature_gate = $gate:ident;)?
     ) => {
         declare_tool_lint! {
             $(#[$attr])* pub rustdoc::$name, $level, $descr
@@ -128,7 +128,7 @@ declare_rustdoc_lint! {
     MISSING_DOC_CODE_EXAMPLES,
     Allow,
     "detects publicly-exported items without code samples in their documentation",
-    @feature_gate = rustc_span::symbol::sym::rustdoc_missing_doc_code_examples;
+    @feature_gate = rustdoc_missing_doc_code_examples;
 }
 
 declare_rustdoc_lint! {
diff --git a/src/tools/clippy/.github/workflows/lintcheck.yml b/src/tools/clippy/.github/workflows/lintcheck.yml
index 91c98b3a2560c..f016a77005920 100644
--- a/src/tools/clippy/.github/workflows/lintcheck.yml
+++ b/src/tools/clippy/.github/workflows/lintcheck.yml
@@ -58,7 +58,7 @@ jobs:
 
     - name: Run lintcheck
       if: steps.cache-json.outputs.cache-hit != 'true'
-      run: ./target/debug/lintcheck --format json
+      run: ./target/debug/lintcheck --format json --warn-all
 
     - name: Upload base JSON
       uses: actions/upload-artifact@v4
@@ -86,7 +86,7 @@ jobs:
       run: cargo build --manifest-path=lintcheck/Cargo.toml
 
     - name: Run lintcheck
-      run: ./target/debug/lintcheck --format json
+      run: ./target/debug/lintcheck --format json --warn-all
 
     - name: Upload head JSON
       uses: actions/upload-artifact@v4
diff --git a/src/tools/clippy/CHANGELOG.md b/src/tools/clippy/CHANGELOG.md
index 70ef2c7936406..55281f3cbec0b 100644
--- a/src/tools/clippy/CHANGELOG.md
+++ b/src/tools/clippy/CHANGELOG.md
@@ -5236,6 +5236,7 @@ Released 2018-09-13
 [`boxed_local`]: https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
 [`branches_sharing_code`]: https://rust-lang.github.io/rust-clippy/master/index.html#branches_sharing_code
 [`builtin_type_shadow`]: https://rust-lang.github.io/rust-clippy/master/index.html#builtin_type_shadow
+[`byte_char_slices`]: https://rust-lang.github.io/rust-clippy/master/index.html#byte_char_slices
 [`bytes_count_to_len`]: https://rust-lang.github.io/rust-clippy/master/index.html#bytes_count_to_len
 [`bytes_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#bytes_nth
 [`cargo_common_metadata`]: https://rust-lang.github.io/rust-clippy/master/index.html#cargo_common_metadata
@@ -5253,6 +5254,7 @@ Released 2018-09-13
 [`cast_sign_loss`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_sign_loss
 [`cast_slice_different_sizes`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_slice_different_sizes
 [`cast_slice_from_raw_parts`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_slice_from_raw_parts
+[`cfg_not_test`]: https://rust-lang.github.io/rust-clippy/master/index.html#cfg_not_test
 [`char_lit_as_u8`]: https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
 [`chars_last_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_last_cmp
 [`chars_next_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_next_cmp
@@ -5539,6 +5541,7 @@ Released 2018-09-13
 [`manual_range_patterns`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_patterns
 [`manual_rem_euclid`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_rem_euclid
 [`manual_retain`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_retain
+[`manual_rotate`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_rotate
 [`manual_saturating_arithmetic`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_saturating_arithmetic
 [`manual_slice_size_calculation`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_slice_size_calculation
 [`manual_split_once`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_split_once
@@ -5587,6 +5590,7 @@ Released 2018-09-13
 [`missing_assert_message`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_assert_message
 [`missing_asserts_for_indexing`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_asserts_for_indexing
 [`missing_const_for_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_const_for_fn
+[`missing_const_for_thread_local`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_const_for_thread_local
 [`missing_docs_in_private_items`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_docs_in_private_items
 [`missing_enforced_import_renames`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_enforced_import_renames
 [`missing_errors_doc`]: https://rust-lang.github.io/rust-clippy/master/index.html#missing_errors_doc
@@ -5701,6 +5705,7 @@ Released 2018-09-13
 [`panic`]: https://rust-lang.github.io/rust-clippy/master/index.html#panic
 [`panic_in_result_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#panic_in_result_fn
 [`panic_params`]: https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
+[`panicking_overflow_checks`]: https://rust-lang.github.io/rust-clippy/master/index.html#panicking_overflow_checks
 [`panicking_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#panicking_unwrap
 [`partial_pub_fields`]: https://rust-lang.github.io/rust-clippy/master/index.html#partial_pub_fields
 [`partialeq_ne_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#partialeq_ne_impl
@@ -5797,6 +5802,7 @@ Released 2018-09-13
 [`semicolon_outside_block`]: https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_outside_block
 [`separated_literal_suffix`]: https://rust-lang.github.io/rust-clippy/master/index.html#separated_literal_suffix
 [`serde_api_misuse`]: https://rust-lang.github.io/rust-clippy/master/index.html#serde_api_misuse
+[`set_contains_or_insert`]: https://rust-lang.github.io/rust-clippy/master/index.html#set_contains_or_insert
 [`shadow_reuse`]: https://rust-lang.github.io/rust-clippy/master/index.html#shadow_reuse
 [`shadow_same`]: https://rust-lang.github.io/rust-clippy/master/index.html#shadow_same
 [`shadow_unrelated`]: https://rust-lang.github.io/rust-clippy/master/index.html#shadow_unrelated
diff --git a/src/tools/clippy/book/src/lint_configuration.md b/src/tools/clippy/book/src/lint_configuration.md
index cfd34c7d2a7d1..ad29339a84ad6 100644
--- a/src/tools/clippy/book/src/lint_configuration.md
+++ b/src/tools/clippy/book/src/lint_configuration.md
@@ -348,6 +348,7 @@ Suppress lints whenever the suggested change would cause breakage for other crat
 * [`enum_variant_names`](https://rust-lang.github.io/rust-clippy/master/index.html#enum_variant_names)
 * [`large_types_passed_by_value`](https://rust-lang.github.io/rust-clippy/master/index.html#large_types_passed_by_value)
 * [`linkedlist`](https://rust-lang.github.io/rust-clippy/master/index.html#linkedlist)
+* [`needless_pass_by_ref_mut`](https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut)
 * [`option_option`](https://rust-lang.github.io/rust-clippy/master/index.html#option_option)
 * [`rc_buffer`](https://rust-lang.github.io/rust-clippy/master/index.html#rc_buffer)
 * [`rc_mutex`](https://rust-lang.github.io/rust-clippy/master/index.html#rc_mutex)
@@ -454,7 +455,7 @@ default configuration of Clippy. By default, any configuration will replace the
 * `doc-valid-idents = ["ClipPy"]` would replace the default list with `["ClipPy"]`.
 * `doc-valid-idents = ["ClipPy", ".."]` would append `ClipPy` to the default list.
 
-**Default Value:** `["KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "DevOps", "DirectX", "ECMAScript", "GPLv2", "GPLv3", "GitHub", "GitLab", "IPv4", "IPv6", "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript", "WebAssembly", "NaN", "NaNs", "OAuth", "GraphQL", "OCaml", "OpenDNS", "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenTelemetry", "WebGL", "WebGL2", "WebGPU", "TensorFlow", "TrueType", "iOS", "macOS", "FreeBSD", "TeX", "LaTeX", "BibTeX", "BibLaTeX", "MinGW", "CamelCase"]`
+**Default Value:** `["KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "DevOps", "DirectX", "ECMAScript", "GPLv2", "GPLv3", "GitHub", "GitLab", "IPv4", "IPv6", "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript", "WebAssembly", "NaN", "NaNs", "OAuth", "GraphQL", "OCaml", "OpenDNS", "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenTelemetry", "WebGL", "WebGL2", "WebGPU", "WebP", "OpenExr", "YCbCr", "sRGB", "TensorFlow", "TrueType", "iOS", "macOS", "FreeBSD", "TeX", "LaTeX", "BibTeX", "BibLaTeX", "MinGW", "CamelCase"]`
 
 ---
 **Affected lints:**
diff --git a/src/tools/clippy/clippy.toml b/src/tools/clippy/clippy.toml
index 62ed55beb1f34..319b72e8c5d50 100644
--- a/src/tools/clippy/clippy.toml
+++ b/src/tools/clippy/clippy.toml
@@ -1,5 +1,9 @@
 avoid-breaking-exported-api = false
 
+[[disallowed-methods]]
+path = "rustc_lint::context::LintContext::lint"
+reason = "this function does not add a link to our documentation, please use the `clippy_utils::diagnostics::span_lint*` functions instead"
+
 [[disallowed-methods]]
 path = "rustc_lint::context::LintContext::span_lint"
 reason = "this function does not add a link to our documentation, please use the `clippy_utils::diagnostics::span_lint*` functions instead"
diff --git a/src/tools/clippy/clippy_config/src/conf.rs b/src/tools/clippy/clippy_config/src/conf.rs
index dbab3b106a80f..7f53aad679330 100644
--- a/src/tools/clippy/clippy_config/src/conf.rs
+++ b/src/tools/clippy/clippy_config/src/conf.rs
@@ -31,6 +31,7 @@ const DEFAULT_DOC_VALID_IDENTS: &[&str] = &[
     "OCaml",
     "OpenDNS", "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenTelemetry",
     "WebGL", "WebGL2", "WebGPU",
+    "WebP", "OpenExr", "YCbCr", "sRGB",
     "TensorFlow",
     "TrueType",
     "iOS", "macOS", "FreeBSD",
@@ -262,7 +263,7 @@ define_Conf! {
     /// arithmetic-side-effects-allowed-unary = ["SomeType", "AnotherType"]
     /// ```
     (arithmetic_side_effects_allowed_unary: FxHashSet<String> = <_>::default()),
-    /// Lint: ENUM_VARIANT_NAMES, LARGE_TYPES_PASSED_BY_VALUE, TRIVIALLY_COPY_PASS_BY_REF, UNNECESSARY_WRAPS, UNUSED_SELF, UPPER_CASE_ACRONYMS, WRONG_SELF_CONVENTION, BOX_COLLECTION, REDUNDANT_ALLOCATION, RC_BUFFER, VEC_BOX, OPTION_OPTION, LINKEDLIST, RC_MUTEX, UNNECESSARY_BOX_RETURNS, SINGLE_CALL_FN.
+    /// Lint: ENUM_VARIANT_NAMES, LARGE_TYPES_PASSED_BY_VALUE, TRIVIALLY_COPY_PASS_BY_REF, UNNECESSARY_WRAPS, UNUSED_SELF, UPPER_CASE_ACRONYMS, WRONG_SELF_CONVENTION, BOX_COLLECTION, REDUNDANT_ALLOCATION, RC_BUFFER, VEC_BOX, OPTION_OPTION, LINKEDLIST, RC_MUTEX, UNNECESSARY_BOX_RETURNS, SINGLE_CALL_FN, NEEDLESS_PASS_BY_REF_MUT.
     ///
     /// Suppress lints whenever the suggested change would cause breakage for other crates.
     (avoid_breaking_exported_api: bool = true),
diff --git a/src/tools/clippy/clippy_config/src/msrvs.rs b/src/tools/clippy/clippy_config/src/msrvs.rs
index a5761d3270cd2..fc56ac5179686 100644
--- a/src/tools/clippy/clippy_config/src/msrvs.rs
+++ b/src/tools/clippy/clippy_config/src/msrvs.rs
@@ -25,8 +25,8 @@ msrv_aliases! {
     1,68,0 { PATH_MAIN_SEPARATOR_STR }
     1,65,0 { LET_ELSE, POINTER_CAST_CONSTNESS }
     1,63,0 { CLONE_INTO }
-    1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE }
-    1,59,0 { THREAD_LOCAL_INITIALIZER_CAN_BE_MADE_CONST }
+    1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE, CONST_EXTERN_FN }
+    1,59,0 { THREAD_LOCAL_CONST_INIT }
     1,58,0 { FORMAT_ARGS_CAPTURE, PATTERN_TRAIT_CHAR_ARRAY, CONST_RAW_PTR_DEREF }
     1,56,0 { CONST_FN_UNION }
     1,55,0 { SEEK_REWIND }
diff --git a/src/tools/clippy/clippy_dev/src/new_lint.rs b/src/tools/clippy/clippy_dev/src/new_lint.rs
index 2e56eb8ec15f8..d762e30ef02e1 100644
--- a/src/tools/clippy/clippy_dev/src/new_lint.rs
+++ b/src/tools/clippy/clippy_dev/src/new_lint.rs
@@ -273,7 +273,7 @@ fn get_lint_file_contents(lint: &LintData<'_>, enable_msrv: bool) -> String {
     result.push_str(&if enable_msrv {
         formatdoc!(
             r#"
-            use clippy_utils::msrvs::{{self, Msrv}};
+            use clippy_config::msrvs::{{self, Msrv}};
             {pass_import}
             use rustc_lint::{{{context_import}, {pass_type}, LintContext}};
             use rustc_session::impl_lint_pass;
@@ -399,7 +399,7 @@ fn create_lint_for_ty(lint: &LintData<'_>, enable_msrv: bool, ty: &str) -> io::R
         let _: fmt::Result = writedoc!(
             lint_file_contents,
             r#"
-                use clippy_utils::msrvs::{{self, Msrv}};
+                use clippy_config::msrvs::{{self, Msrv}};
                 use rustc_lint::{{{context_import}, LintContext}};
 
                 use super::{name_upper};
diff --git a/src/tools/clippy/clippy_lints/src/almost_complete_range.rs b/src/tools/clippy/clippy_lints/src/almost_complete_range.rs
index 57a5cd8fba818..96e9c949b7500 100644
--- a/src/tools/clippy/clippy_lints/src/almost_complete_range.rs
+++ b/src/tools/clippy/clippy_lints/src/almost_complete_range.rs
@@ -6,7 +6,6 @@ use rustc_errors::Applicability;
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_session::impl_lint_pass;
-use rustc_span::Span;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -41,61 +40,80 @@ impl AlmostCompleteRange {
 }
 impl EarlyLintPass for AlmostCompleteRange {
     fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &Expr) {
-        if let ExprKind::Range(Some(start), Some(end), RangeLimits::HalfOpen) = &e.kind {
-            let ctxt = e.span.ctxt();
-            let sugg = if let Some(start) = walk_span_to_context(start.span, ctxt)
-                && let Some(end) = walk_span_to_context(end.span, ctxt)
-                && self.msrv.meets(msrvs::RANGE_INCLUSIVE)
-            {
-                Some((trim_span(cx.sess().source_map(), start.between(end)), "..="))
-            } else {
-                None
-            };
-            check_range(cx, e.span, start, end, sugg);
+        if let ExprKind::Range(Some(start), Some(end), RangeLimits::HalfOpen) = &e.kind
+            && is_incomplete_range(start, end)
+            && !in_external_macro(cx.sess(), e.span)
+        {
+            span_lint_and_then(
+                cx,
+                ALMOST_COMPLETE_RANGE,
+                e.span,
+                "almost complete ascii range",
+                |diag| {
+                    let ctxt = e.span.ctxt();
+                    if let Some(start) = walk_span_to_context(start.span, ctxt)
+                        && let Some(end) = walk_span_to_context(end.span, ctxt)
+                        && self.msrv.meets(msrvs::RANGE_INCLUSIVE)
+                    {
+                        diag.span_suggestion(
+                            trim_span(cx.sess().source_map(), start.between(end)),
+                            "use an inclusive range",
+                            "..=".to_owned(),
+                            Applicability::MaybeIncorrect,
+                        );
+                    }
+                },
+            );
         }
     }
 
     fn check_pat(&mut self, cx: &EarlyContext<'_>, p: &Pat) {
         if let PatKind::Range(Some(start), Some(end), kind) = &p.kind
             && matches!(kind.node, RangeEnd::Excluded)
+            && is_incomplete_range(start, end)
+            && !in_external_macro(cx.sess(), p.span)
         {
-            let sugg = if self.msrv.meets(msrvs::RANGE_INCLUSIVE) {
-                "..="
-            } else {
-                "..."
-            };
-            check_range(cx, p.span, start, end, Some((kind.span, sugg)));
+            span_lint_and_then(
+                cx,
+                ALMOST_COMPLETE_RANGE,
+                p.span,
+                "almost complete ascii range",
+                |diag| {
+                    diag.span_suggestion(
+                        kind.span,
+                        "use an inclusive range",
+                        if self.msrv.meets(msrvs::RANGE_INCLUSIVE) {
+                            "..=".to_owned()
+                        } else {
+                            "...".to_owned()
+                        },
+                        Applicability::MaybeIncorrect,
+                    );
+                },
+            );
         }
     }
 
     extract_msrv_attr!(EarlyContext);
 }
 
-fn check_range(cx: &EarlyContext<'_>, span: Span, start: &Expr, end: &Expr, sugg: Option<(Span, &str)>) {
-    if let ExprKind::Lit(start_token_lit) = start.peel_parens().kind
-        && let ExprKind::Lit(end_token_lit) = end.peel_parens().kind
-        && matches!(
-            (
-                LitKind::from_token_lit(start_token_lit),
-                LitKind::from_token_lit(end_token_lit),
-            ),
-            (
-                Ok(LitKind::Byte(b'a') | LitKind::Char('a')),
-                Ok(LitKind::Byte(b'z') | LitKind::Char('z'))
-            ) | (
-                Ok(LitKind::Byte(b'A') | LitKind::Char('A')),
-                Ok(LitKind::Byte(b'Z') | LitKind::Char('Z')),
-            ) | (
-                Ok(LitKind::Byte(b'0') | LitKind::Char('0')),
-                Ok(LitKind::Byte(b'9') | LitKind::Char('9')),
+fn is_incomplete_range(start: &Expr, end: &Expr) -> bool {
+    match (&start.peel_parens().kind, &end.peel_parens().kind) {
+        (&ExprKind::Lit(start_lit), &ExprKind::Lit(end_lit)) => {
+            matches!(
+                (LitKind::from_token_lit(start_lit), LitKind::from_token_lit(end_lit),),
+                (
+                    Ok(LitKind::Byte(b'a') | LitKind::Char('a')),
+                    Ok(LitKind::Byte(b'z') | LitKind::Char('z'))
+                ) | (
+                    Ok(LitKind::Byte(b'A') | LitKind::Char('A')),
+                    Ok(LitKind::Byte(b'Z') | LitKind::Char('Z')),
+                ) | (
+                    Ok(LitKind::Byte(b'0') | LitKind::Char('0')),
+                    Ok(LitKind::Byte(b'9') | LitKind::Char('9')),
+                )
             )
-        )
-        && !in_external_macro(cx.sess(), span)
-    {
-        span_lint_and_then(cx, ALMOST_COMPLETE_RANGE, span, "almost complete ascii range", |diag| {
-            if let Some((span, sugg)) = sugg {
-                diag.span_suggestion(span, "use an inclusive range", sugg, Applicability::MaybeIncorrect);
-            }
-        });
+        },
+        _ => false,
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/assertions_on_constants.rs b/src/tools/clippy/clippy_lints/src/assertions_on_constants.rs
index 2003dd1fb0e2c..ed4cdce8cb886 100644
--- a/src/tools/clippy/clippy_lints/src/assertions_on_constants.rs
+++ b/src/tools/clippy/clippy_lints/src/assertions_on_constants.rs
@@ -1,7 +1,8 @@
-use clippy_utils::consts::{constant_with_source, Constant, ConstantSource};
+use clippy_utils::consts::{constant, Constant};
 use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::is_inside_always_const_context;
 use clippy_utils::macros::{find_assert_args, root_macro_call_first_node, PanicExpn};
-use rustc_hir::{Expr, Item, ItemKind, Node};
+use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
 use rustc_span::sym;
@@ -42,17 +43,16 @@ impl<'tcx> LateLintPass<'tcx> for AssertionsOnConstants {
         let Some((condition, panic_expn)) = find_assert_args(cx, e, macro_call.expn) else {
             return;
         };
-        let Some((Constant::Bool(val), source)) = constant_with_source(cx, cx.typeck_results(), condition) else {
+        let Some(Constant::Bool(val)) = constant(cx, cx.typeck_results(), condition) else {
             return;
         };
-        if let ConstantSource::Constant = source
-            && let Node::Item(Item {
-                kind: ItemKind::Const(..),
-                ..
-            }) = cx.tcx.parent_hir_node(e.hir_id)
-        {
-            return;
+
+        match condition.kind {
+            ExprKind::Path(..) | ExprKind::Lit(_) => {},
+            _ if is_inside_always_const_context(cx.tcx, e.hir_id) => return,
+            _ => {},
         }
+
         if val {
             span_lint_and_help(
                 cx,
diff --git a/src/tools/clippy/clippy_lints/src/assigning_clones.rs b/src/tools/clippy/clippy_lints/src/assigning_clones.rs
index 406f38f411ecd..0de0031ed24ff 100644
--- a/src/tools/clippy/clippy_lints/src/assigning_clones.rs
+++ b/src/tools/clippy/clippy_lints/src/assigning_clones.rs
@@ -1,18 +1,16 @@
 use clippy_config::msrvs::{self, Msrv};
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::macros::HirNode;
 use clippy_utils::mir::{enclosing_mir, PossibleBorrowerMap};
 use clippy_utils::sugg::Sugg;
-use clippy_utils::{is_trait_method, local_is_initialized, path_to_local};
+use clippy_utils::{is_diag_trait_item, last_path_segment, local_is_initialized, path_to_local};
 use rustc_errors::Applicability;
 use rustc_hir::{self as hir, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir;
 use rustc_middle::ty::{self, Instance, Mutability};
 use rustc_session::impl_lint_pass;
-use rustc_span::def_id::DefId;
 use rustc_span::symbol::sym;
-use rustc_span::{ExpnKind, Span, SyntaxContext};
+use rustc_span::{Span, SyntaxContext};
 
 declare_clippy_lint! {
     /// ### What it does
@@ -68,165 +66,82 @@ impl AssigningClones {
 impl_lint_pass!(AssigningClones => [ASSIGNING_CLONES]);
 
 impl<'tcx> LateLintPass<'tcx> for AssigningClones {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, assign_expr: &'tcx Expr<'_>) {
-        // Do not fire the lint in macros
-        let ctxt = assign_expr.span().ctxt();
-        let expn_data = ctxt.outer_expn_data();
-        match expn_data.kind {
-            ExpnKind::AstPass(_) | ExpnKind::Desugaring(_) | ExpnKind::Macro(..) => return,
-            ExpnKind::Root => {},
-        }
-
-        let ExprKind::Assign(lhs, rhs, _span) = assign_expr.kind else {
-            return;
-        };
-
-        let Some(call) = extract_call(cx, rhs) else {
-            return;
-        };
-
-        if is_ok_to_suggest(cx, lhs, &call, &self.msrv) {
-            suggest(cx, ctxt, assign_expr, lhs, &call);
-        }
-    }
-
-    extract_msrv_attr!(LateContext);
-}
-
-// Try to resolve the call to `Clone::clone` or `ToOwned::to_owned`.
-fn extract_call<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<CallCandidate<'tcx>> {
-    let fn_def_id = clippy_utils::fn_def_id(cx, expr)?;
-
-    // Fast paths to only check method calls without arguments or function calls with a single argument
-    let (target, kind, resolved_method) = match expr.kind {
-        ExprKind::MethodCall(path, receiver, [], _span) => {
-            let args = cx.typeck_results().node_args(expr.hir_id);
-
-            // If we could not resolve the method, don't apply the lint
-            let Ok(Some(resolved_method)) = Instance::try_resolve(cx.tcx, cx.param_env, fn_def_id, args) else {
-                return None;
-            };
-            if is_trait_method(cx, expr, sym::Clone) && path.ident.name == sym::clone {
-                (TargetTrait::Clone, CallKind::MethodCall { receiver }, resolved_method)
-            } else if is_trait_method(cx, expr, sym::ToOwned) && path.ident.name.as_str() == "to_owned" {
-                (TargetTrait::ToOwned, CallKind::MethodCall { receiver }, resolved_method)
-            } else {
-                return None;
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+        if let ExprKind::Assign(lhs, rhs, _) = e.kind
+            && let typeck = cx.typeck_results()
+            && let (call_kind, fn_name, fn_id, fn_arg, fn_gen_args) = match rhs.kind {
+                ExprKind::Call(f, [arg])
+                    if let ExprKind::Path(fn_path) = &f.kind
+                        && let Some(id) = typeck.qpath_res(fn_path, f.hir_id).opt_def_id() =>
+                {
+                    (CallKind::Ufcs, last_path_segment(fn_path).ident.name, id, arg, typeck.node_args(f.hir_id))
+                },
+                ExprKind::MethodCall(name, recv, [], _) if let Some(id) = typeck.type_dependent_def_id(rhs.hir_id) => {
+                    (CallKind::Method, name.ident.name, id, recv, typeck.node_args(rhs.hir_id))
+                },
+                _ => return,
             }
-        },
-        ExprKind::Call(function, [arg]) => {
-            let kind = cx.typeck_results().node_type(function.hir_id).kind();
-
-            // If we could not resolve the method, don't apply the lint
-            let Ok(Some(resolved_method)) = (match kind {
-                ty::FnDef(_, args) => Instance::try_resolve(cx.tcx, cx.param_env, fn_def_id, args),
-                _ => Ok(None),
-            }) else {
-                return None;
-            };
-            if cx.tcx.is_diagnostic_item(sym::to_owned_method, fn_def_id) {
-                (
-                    TargetTrait::ToOwned,
-                    CallKind::FunctionCall { self_arg: arg },
-                    resolved_method,
-                )
-            } else if let Some(trait_did) = cx.tcx.trait_of_item(fn_def_id)
-                && cx.tcx.is_diagnostic_item(sym::Clone, trait_did)
-            {
-                (
-                    TargetTrait::Clone,
-                    CallKind::FunctionCall { self_arg: arg },
-                    resolved_method,
-                )
-            } else {
-                return None;
+            && let ctxt = e.span.ctxt()
+            // Don't lint in macros.
+            && ctxt.is_root()
+            && let which_trait = match fn_name {
+                sym::clone if is_diag_trait_item(cx, fn_id, sym::Clone) => CloneTrait::Clone,
+                _ if fn_name.as_str() == "to_owned"
+                    && is_diag_trait_item(cx, fn_id, sym::ToOwned)
+                    && self.msrv.meets(msrvs::CLONE_INTO) =>
+                {
+                    CloneTrait::ToOwned
+                },
+                _ => return,
             }
-        },
-        _ => return None,
-    };
-
-    Some(CallCandidate {
-        span: expr.span,
-        target,
-        kind,
-        method_def_id: resolved_method.def_id(),
-    })
-}
-
-// Return true if we find that the called method has a custom implementation and isn't derived or
-// provided by default by the corresponding trait.
-fn is_ok_to_suggest<'tcx>(cx: &LateContext<'tcx>, lhs: &Expr<'tcx>, call: &CallCandidate<'tcx>, msrv: &Msrv) -> bool {
-    // For calls to .to_owned we suggest using .clone_into(), which was only stablilized in 1.63.
-    // If the current MSRV is below that, don't suggest the lint.
-    if !msrv.meets(msrvs::CLONE_INTO) && matches!(call.target, TargetTrait::ToOwned) {
-        return false;
-    }
-
-    // If the left-hand side is a local variable, it might be uninitialized at this point.
-    // In that case we do not want to suggest the lint.
-    if let Some(local) = path_to_local(lhs) {
-        // TODO: This check currently bails if the local variable has no initializer.
-        // That is overly conservative - the lint should fire even if there was no initializer,
-        // but the variable has been initialized before `lhs` was evaluated.
-        if !local_is_initialized(cx, local) {
-            return false;
-        }
-    }
-
-    let Some(impl_block) = cx.tcx.impl_of_method(call.method_def_id) else {
-        return false;
-    };
-
-    // If the method implementation comes from #[derive(Clone)], then don't suggest the lint.
-    // Automatically generated Clone impls do not currently override `clone_from`.
-    // See e.g. https://github.com/rust-lang/rust/pull/98445#issuecomment-1190681305 for more details.
-    if cx.tcx.is_builtin_derived(impl_block) {
-        return false;
-    }
-
-    // If the call expression is inside an impl block that contains the method invoked by the
-    // call expression, we bail out to avoid suggesting something that could result in endless
-    // recursion.
-    if let Some(local_block_id) = impl_block.as_local()
-        && let Some(block) = cx.tcx.hir_node_by_def_id(local_block_id).as_owner()
-    {
-        let impl_block_owner = block.def_id();
-        if cx
-            .tcx
-            .hir()
-            .parent_id_iter(lhs.hir_id)
-            .any(|parent| parent.owner == impl_block_owner)
+            && let Ok(Some(resolved_fn)) = Instance::try_resolve(cx.tcx, cx.param_env, fn_id, fn_gen_args)
+            // TODO: This check currently bails if the local variable has no initializer.
+            // That is overly conservative - the lint should fire even if there was no initializer,
+            // but the variable has been initialized before `lhs` was evaluated.
+            && path_to_local(lhs).map_or(true, |lhs| local_is_initialized(cx, lhs))
+            && let Some(resolved_impl) = cx.tcx.impl_of_method(resolved_fn.def_id())
+            // Derived forms don't implement `clone_from`/`clone_into`.
+            // See https://github.com/rust-lang/rust/pull/98445#issuecomment-1190681305
+            && !cx.tcx.is_builtin_derived(resolved_impl)
+            // Don't suggest calling a function we're implementing.
+            && resolved_impl.as_local().map_or(true, |block_id| {
+                cx.tcx.hir().parent_owner_iter(e.hir_id).all(|(id, _)| id.def_id != block_id)
+            })
+            && let resolved_assoc_items = cx.tcx.associated_items(resolved_impl)
+            // Only suggest if `clone_from`/`clone_into` is explicitly implemented
+            && resolved_assoc_items.in_definition_order().any(|assoc|
+                match which_trait {
+                    CloneTrait::Clone => assoc.name == sym::clone_from,
+                    CloneTrait::ToOwned => assoc.name.as_str() == "clone_into",
+                }
+            )
+            && !clone_source_borrows_from_dest(cx, lhs, rhs.span)
         {
-            return false;
+            span_lint_and_then(
+                cx,
+                ASSIGNING_CLONES,
+                e.span,
+                match which_trait {
+                    CloneTrait::Clone => "assigning the result of `Clone::clone()` may be inefficient",
+                    CloneTrait::ToOwned => "assigning the result of `ToOwned::to_owned()` may be inefficient",
+                },
+                |diag| {
+                    let mut app = Applicability::Unspecified;
+                    diag.span_suggestion(
+                        e.span,
+                        match which_trait {
+                            CloneTrait::Clone => "use `clone_from()`",
+                            CloneTrait::ToOwned => "use `clone_into()`",
+                        },
+                        build_sugg(cx, ctxt, lhs, fn_arg, which_trait, call_kind, &mut app),
+                        app,
+                    );
+                },
+            );
         }
     }
 
-    // Find the function for which we want to check that it is implemented.
-    let provided_fn = match call.target {
-        TargetTrait::Clone => cx.tcx.get_diagnostic_item(sym::Clone).and_then(|clone| {
-            cx.tcx
-                .provided_trait_methods(clone)
-                .find(|item| item.name == sym::clone_from)
-        }),
-        TargetTrait::ToOwned => cx.tcx.get_diagnostic_item(sym::ToOwned).and_then(|to_owned| {
-            cx.tcx
-                .provided_trait_methods(to_owned)
-                .find(|item| item.name.as_str() == "clone_into")
-        }),
-    };
-    let Some(provided_fn) = provided_fn else {
-        return false;
-    };
-
-    if clone_source_borrows_from_dest(cx, lhs, call.span) {
-        return false;
-    }
-
-    // Now take a look if the impl block defines an implementation for the method that we're interested
-    // in. If not, then we're using a default implementation, which is not interesting, so we will
-    // not suggest the lint.
-    let implemented_fns = cx.tcx.impl_item_implementor_ids(impl_block);
-    implemented_fns.contains_key(&provided_fn.def_id)
+    extract_msrv_attr!(LateContext);
 }
 
 /// Checks if the data being cloned borrows from the place that is being assigned to:
@@ -239,16 +154,6 @@ fn is_ok_to_suggest<'tcx>(cx: &LateContext<'tcx>, lhs: &Expr<'tcx>, call: &CallC
 ///
 /// This cannot be written `s2.clone_into(&mut s)` because it has conflicting borrows.
 fn clone_source_borrows_from_dest(cx: &LateContext<'_>, lhs: &Expr<'_>, call_span: Span) -> bool {
-    /// If this basic block only exists to drop a local as part of an assignment, returns its
-    /// successor. Otherwise returns the basic block that was passed in.
-    fn skip_drop_block(mir: &mir::Body<'_>, bb: mir::BasicBlock) -> mir::BasicBlock {
-        if let mir::TerminatorKind::Drop { target, .. } = mir.basic_blocks[bb].terminator().kind {
-            target
-        } else {
-            bb
-        }
-    }
-
     let Some(mir) = enclosing_mir(cx.tcx, lhs.hir_id) else {
         return false;
     };
@@ -267,172 +172,123 @@ fn clone_source_borrows_from_dest(cx: &LateContext<'_>, lhs: &Expr<'_>, call_spa
     //
     // bb2:
     //  s = s_temp
-    for bb in mir.basic_blocks.iter() {
-        let terminator = bb.terminator();
-
-        // Look for the to_owned/clone call.
-        if terminator.source_info.span != call_span {
-            continue;
+    if let Some(terminator) = mir.basic_blocks.iter()
+            .map(mir::BasicBlockData::terminator)
+            .find(|term| term.source_info.span == call_span)
+        && let mir::TerminatorKind::Call { ref args, target: Some(assign_bb), .. } = terminator.kind
+        && let [source] = &**args
+        && let mir::Operand::Move(source) = &source.node
+        && let assign_bb = &mir.basic_blocks[assign_bb]
+        && let assign_bb = match assign_bb.terminator().kind {
+            // Skip the drop of the assignment's destination.
+            mir::TerminatorKind::Drop { target, .. } => &mir.basic_blocks[target],
+            _ => assign_bb,
         }
-
-        if let mir::TerminatorKind::Call { ref args, target: Some(assign_bb), .. } = terminator.kind
-            && let [source] = &**args
-            && let mir::Operand::Move(source) = &source.node
-            && let assign_bb = skip_drop_block(mir, assign_bb)
-            // Skip any storage statements as they are just noise
-            && let Some(assignment) = mir.basic_blocks[assign_bb].statements
-                .iter()
-                .find(|stmt| {
-                    !matches!(stmt.kind, mir::StatementKind::StorageDead(_) | mir::StatementKind::StorageLive(_))
-                })
-            && let mir::StatementKind::Assign(box (borrowed, _)) = &assignment.kind
-            && let Some(borrowers) = borrow_map.get(&borrowed.local)
-            && borrowers.contains(source.local)
-        {
-            return true;
-        }
-
-        return false;
+        // Skip any storage statements as they are just noise
+        && let Some(assignment) = assign_bb.statements
+            .iter()
+            .find(|stmt| {
+                !matches!(stmt.kind, mir::StatementKind::StorageDead(_) | mir::StatementKind::StorageLive(_))
+            })
+        && let mir::StatementKind::Assign(box (borrowed, _)) = &assignment.kind
+        && let Some(borrowers) = borrow_map.get(&borrowed.local)
+    {
+        borrowers.contains(source.local)
+    } else {
+        false
     }
-    false
-}
-
-fn suggest<'tcx>(
-    cx: &LateContext<'tcx>,
-    ctxt: SyntaxContext,
-    assign_expr: &Expr<'tcx>,
-    lhs: &Expr<'tcx>,
-    call: &CallCandidate<'tcx>,
-) {
-    span_lint_and_then(cx, ASSIGNING_CLONES, assign_expr.span, call.message(), |diag| {
-        let mut applicability = Applicability::Unspecified;
-
-        diag.span_suggestion(
-            assign_expr.span,
-            call.suggestion_msg(),
-            call.suggested_replacement(cx, ctxt, lhs, &mut applicability),
-            applicability,
-        );
-    });
 }
 
-#[derive(Copy, Clone, Debug)]
-enum CallKind<'tcx> {
-    MethodCall { receiver: &'tcx Expr<'tcx> },
-    FunctionCall { self_arg: &'tcx Expr<'tcx> },
-}
-
-#[derive(Copy, Clone, Debug)]
-enum TargetTrait {
+#[derive(Clone, Copy)]
+enum CloneTrait {
     Clone,
     ToOwned,
 }
 
-#[derive(Debug)]
-struct CallCandidate<'tcx> {
-    span: Span,
-    target: TargetTrait,
-    kind: CallKind<'tcx>,
-    // DefId of the called method from an impl block that implements the target trait
-    method_def_id: DefId,
+#[derive(Copy, Clone)]
+enum CallKind {
+    Ufcs,
+    Method,
 }
 
-impl<'tcx> CallCandidate<'tcx> {
-    #[inline]
-    fn message(&self) -> &'static str {
-        match self.target {
-            TargetTrait::Clone => "assigning the result of `Clone::clone()` may be inefficient",
-            TargetTrait::ToOwned => "assigning the result of `ToOwned::to_owned()` may be inefficient",
-        }
-    }
-
-    #[inline]
-    fn suggestion_msg(&self) -> &'static str {
-        match self.target {
-            TargetTrait::Clone => "use `clone_from()`",
-            TargetTrait::ToOwned => "use `clone_into()`",
-        }
-    }
-
-    fn suggested_replacement(
-        &self,
-        cx: &LateContext<'tcx>,
-        ctxt: SyntaxContext,
-        lhs: &Expr<'tcx>,
-        applicability: &mut Applicability,
-    ) -> String {
-        match self.target {
-            TargetTrait::Clone => {
-                match self.kind {
-                    CallKind::MethodCall { receiver } => {
-                        let receiver_sugg = if let ExprKind::Unary(hir::UnOp::Deref, ref_expr) = lhs.kind {
-                            // `*lhs = self_expr.clone();` -> `lhs.clone_from(self_expr)`
-                            Sugg::hir_with_applicability(cx, ref_expr, "_", applicability)
-                        } else {
-                            // `lhs = self_expr.clone();` -> `lhs.clone_from(self_expr)`
-                            Sugg::hir_with_applicability(cx, lhs, "_", applicability)
-                        }
-                        .maybe_par();
-
-                        // Determine whether we need to reference the argument to clone_from().
-                        let clone_receiver_type = cx.typeck_results().expr_ty(receiver);
-                        let clone_receiver_adj_type = cx.typeck_results().expr_ty_adjusted(receiver);
-                        let mut arg_sugg = Sugg::hir_with_context(cx, receiver, ctxt, "_", applicability);
-                        if clone_receiver_type != clone_receiver_adj_type {
-                            // The receiver may have been a value type, so we need to add an `&` to
-                            // be sure the argument to clone_from will be a reference.
-                            arg_sugg = arg_sugg.addr();
-                        };
-
-                        format!("{receiver_sugg}.clone_from({arg_sugg})")
-                    },
-                    CallKind::FunctionCall { self_arg, .. } => {
-                        let self_sugg = if let ExprKind::Unary(hir::UnOp::Deref, ref_expr) = lhs.kind {
-                            // `*lhs = Clone::clone(self_expr);` -> `Clone::clone_from(lhs, self_expr)`
-                            Sugg::hir_with_applicability(cx, ref_expr, "_", applicability)
-                        } else {
-                            // `lhs = Clone::clone(self_expr);` -> `Clone::clone_from(&mut lhs, self_expr)`
-                            Sugg::hir_with_applicability(cx, lhs, "_", applicability).mut_addr()
-                        };
-                        // The RHS had to be exactly correct before the call, there is no auto-deref for function calls.
-                        let rhs_sugg = Sugg::hir_with_context(cx, self_arg, ctxt, "_", applicability);
-
-                        format!("Clone::clone_from({self_sugg}, {rhs_sugg})")
-                    },
-                }
-            },
-            TargetTrait::ToOwned => {
-                let rhs_sugg = if let ExprKind::Unary(hir::UnOp::Deref, ref_expr) = lhs.kind {
-                    // `*lhs = rhs.to_owned()` -> `rhs.clone_into(lhs)`
-                    // `*lhs = ToOwned::to_owned(rhs)` -> `ToOwned::clone_into(rhs, lhs)`
-                    let sugg = Sugg::hir_with_applicability(cx, ref_expr, "_", applicability).maybe_par();
-                    let inner_type = cx.typeck_results().expr_ty(ref_expr);
-                    // If after unwrapping the dereference, the type is not a mutable reference, we add &mut to make it
-                    // deref to a mutable reference.
-                    if matches!(inner_type.kind(), ty::Ref(_, _, Mutability::Mut)) {
-                        sugg
+fn build_sugg<'tcx>(
+    cx: &LateContext<'tcx>,
+    ctxt: SyntaxContext,
+    lhs: &'tcx Expr<'_>,
+    fn_arg: &'tcx Expr<'_>,
+    which_trait: CloneTrait,
+    call_kind: CallKind,
+    app: &mut Applicability,
+) -> String {
+    match which_trait {
+        CloneTrait::Clone => {
+            match call_kind {
+                CallKind::Method => {
+                    let receiver_sugg = if let ExprKind::Unary(hir::UnOp::Deref, ref_expr) = lhs.kind {
+                        // `*lhs = self_expr.clone();` -> `lhs.clone_from(self_expr)`
+                        Sugg::hir_with_applicability(cx, ref_expr, "_", app)
                     } else {
-                        sugg.mut_addr()
+                        // `lhs = self_expr.clone();` -> `lhs.clone_from(self_expr)`
+                        Sugg::hir_with_applicability(cx, lhs, "_", app)
                     }
+                    .maybe_par();
+
+                    // Determine whether we need to reference the argument to clone_from().
+                    let clone_receiver_type = cx.typeck_results().expr_ty(fn_arg);
+                    let clone_receiver_adj_type = cx.typeck_results().expr_ty_adjusted(fn_arg);
+                    let mut arg_sugg = Sugg::hir_with_context(cx, fn_arg, ctxt, "_", app);
+                    if clone_receiver_type != clone_receiver_adj_type {
+                        // The receiver may have been a value type, so we need to add an `&` to
+                        // be sure the argument to clone_from will be a reference.
+                        arg_sugg = arg_sugg.addr();
+                    };
+
+                    format!("{receiver_sugg}.clone_from({arg_sugg})")
+                },
+                CallKind::Ufcs => {
+                    let self_sugg = if let ExprKind::Unary(hir::UnOp::Deref, ref_expr) = lhs.kind {
+                        // `*lhs = Clone::clone(self_expr);` -> `Clone::clone_from(lhs, self_expr)`
+                        Sugg::hir_with_applicability(cx, ref_expr, "_", app)
+                    } else {
+                        // `lhs = Clone::clone(self_expr);` -> `Clone::clone_from(&mut lhs, self_expr)`
+                        Sugg::hir_with_applicability(cx, lhs, "_", app).mut_addr()
+                    };
+                    // The RHS had to be exactly correct before the call, there is no auto-deref for function calls.
+                    let rhs_sugg = Sugg::hir_with_context(cx, fn_arg, ctxt, "_", app);
+
+                    format!("Clone::clone_from({self_sugg}, {rhs_sugg})")
+                },
+            }
+        },
+        CloneTrait::ToOwned => {
+            let rhs_sugg = if let ExprKind::Unary(hir::UnOp::Deref, ref_expr) = lhs.kind {
+                // `*lhs = rhs.to_owned()` -> `rhs.clone_into(lhs)`
+                // `*lhs = ToOwned::to_owned(rhs)` -> `ToOwned::clone_into(rhs, lhs)`
+                let sugg = Sugg::hir_with_applicability(cx, ref_expr, "_", app).maybe_par();
+                let inner_type = cx.typeck_results().expr_ty(ref_expr);
+                // If after unwrapping the dereference, the type is not a mutable reference, we add &mut to make it
+                // deref to a mutable reference.
+                if matches!(inner_type.kind(), ty::Ref(_, _, Mutability::Mut)) {
+                    sugg
                 } else {
-                    // `lhs = rhs.to_owned()` -> `rhs.clone_into(&mut lhs)`
-                    // `lhs = ToOwned::to_owned(rhs)` -> `ToOwned::clone_into(rhs, &mut lhs)`
-                    Sugg::hir_with_applicability(cx, lhs, "_", applicability)
-                        .maybe_par()
-                        .mut_addr()
-                };
-
-                match self.kind {
-                    CallKind::MethodCall { receiver } => {
-                        let receiver_sugg = Sugg::hir_with_context(cx, receiver, ctxt, "_", applicability);
-                        format!("{receiver_sugg}.clone_into({rhs_sugg})")
-                    },
-                    CallKind::FunctionCall { self_arg, .. } => {
-                        let self_sugg = Sugg::hir_with_context(cx, self_arg, ctxt, "_", applicability);
-                        format!("ToOwned::clone_into({self_sugg}, {rhs_sugg})")
-                    },
+                    sugg.mut_addr()
                 }
-            },
-        }
+            } else {
+                // `lhs = rhs.to_owned()` -> `rhs.clone_into(&mut lhs)`
+                // `lhs = ToOwned::to_owned(rhs)` -> `ToOwned::clone_into(rhs, &mut lhs)`
+                Sugg::hir_with_applicability(cx, lhs, "_", app).maybe_par().mut_addr()
+            };
+
+            match call_kind {
+                CallKind::Method => {
+                    let receiver_sugg = Sugg::hir_with_context(cx, fn_arg, ctxt, "_", app);
+                    format!("{receiver_sugg}.clone_into({rhs_sugg})")
+                },
+                CallKind::Ufcs => {
+                    let self_sugg = Sugg::hir_with_context(cx, fn_arg, ctxt, "_", app);
+                    format!("ToOwned::clone_into({self_sugg}, {rhs_sugg})")
+                },
+            }
+        },
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/await_holding_invalid.rs b/src/tools/clippy/clippy_lints/src/await_holding_invalid.rs
index f25a474d9bbd6..d4a1e2780d083 100644
--- a/src/tools/clippy/clippy_lints/src/await_holding_invalid.rs
+++ b/src/tools/clippy/clippy_lints/src/await_holding_invalid.rs
@@ -11,21 +11,25 @@ use rustc_span::{sym, Span};
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for calls to await while holding a non-async-aware MutexGuard.
+    /// Checks for calls to `await` while holding a non-async-aware
+    /// `MutexGuard`.
     ///
     /// ### Why is this bad?
-    /// The Mutex types found in std::sync and parking_lot
-    /// are not designed to operate in an async context across await points.
+    /// The Mutex types found in [`std::sync`][https://doc.rust-lang.org/stable/std/sync/] and
+    /// [`parking_lot`](https://docs.rs/parking_lot/latest/parking_lot/) are
+    /// not designed to operate in an async context across await points.
     ///
-    /// There are two potential solutions. One is to use an async-aware Mutex
-    /// type. Many asynchronous foundation crates provide such a Mutex type. The
-    /// other solution is to ensure the mutex is unlocked before calling await,
-    /// either by introducing a scope or an explicit call to Drop::drop.
+    /// There are two potential solutions. One is to use an async-aware `Mutex`
+    /// type. Many asynchronous foundation crates provide such a `Mutex` type.
+    /// The other solution is to ensure the mutex is unlocked before calling
+    /// `await`, either by introducing a scope or an explicit call to
+    /// [`Drop::drop`](https://doc.rust-lang.org/std/ops/trait.Drop.html).
     ///
     /// ### Known problems
     /// Will report false positive for explicitly dropped guards
-    /// ([#6446](https://github.com/rust-lang/rust-clippy/issues/6446)). A workaround for this is
-    /// to wrap the `.lock()` call in a block instead of explicitly dropping the guard.
+    /// ([#6446](https://github.com/rust-lang/rust-clippy/issues/6446)). A
+    /// workaround for this is to wrap the `.lock()` call in a block instead of
+    /// explicitly dropping the guard.
     ///
     /// ### Example
     /// ```no_run
@@ -73,11 +77,11 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for calls to await while holding a `RefCell` `Ref` or `RefMut`.
+    /// Checks for calls to `await` while holding a `RefCell`, `Ref`, or `RefMut`.
     ///
     /// ### Why is this bad?
     /// `RefCell` refs only check for exclusive mutable access
-    /// at runtime. Holding onto a `RefCell` ref across an `await` suspension point
+    /// at runtime. Holding a `RefCell` ref across an await suspension point
     /// risks panics from a mutable ref shared while other refs are outstanding.
     ///
     /// ### Known problems
@@ -131,13 +135,13 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Allows users to configure types which should not be held across `await`
+    /// Allows users to configure types which should not be held across await
     /// suspension points.
     ///
     /// ### Why is this bad?
-    /// There are some types which are perfectly "safe" to be used concurrently
-    /// from a memory access perspective but will cause bugs at runtime if they
-    /// are held in such a way.
+    /// There are some types which are perfectly safe to use concurrently from
+    /// a memory access perspective, but that will cause bugs at runtime if
+    /// they are held in such a way.
     ///
     /// ### Example
     ///
@@ -228,15 +232,15 @@ impl AwaitHolding {
                         cx,
                         AWAIT_HOLDING_LOCK,
                         ty_cause.source_info.span,
-                        "this `MutexGuard` is held across an `await` point",
+                        "this `MutexGuard` is held across an await point",
                         |diag| {
                             diag.help(
                                 "consider using an async-aware `Mutex` type or ensuring the \
-                                `MutexGuard` is dropped before calling await",
+                                `MutexGuard` is dropped before calling `await`",
                             );
                             diag.span_note(
                                 await_points(),
-                                "these are all the `await` points this lock is held through",
+                                "these are all the await points this lock is held through",
                             );
                         },
                     );
@@ -245,12 +249,12 @@ impl AwaitHolding {
                         cx,
                         AWAIT_HOLDING_REFCELL_REF,
                         ty_cause.source_info.span,
-                        "this `RefCell` reference is held across an `await` point",
+                        "this `RefCell` reference is held across an await point",
                         |diag| {
                             diag.help("ensure the reference is dropped before calling `await`");
                             diag.span_note(
                                 await_points(),
-                                "these are all the `await` points this reference is held through",
+                                "these are all the await points this reference is held through",
                             );
                         },
                     );
@@ -268,7 +272,7 @@ fn emit_invalid_type(cx: &LateContext<'_>, span: Span, disallowed: &DisallowedPa
         AWAIT_HOLDING_INVALID_TYPE,
         span,
         format!(
-            "`{}` may not be held across an `await` point per `clippy.toml`",
+            "`{}` may not be held across an await point per `clippy.toml`",
             disallowed.path()
         ),
         |diag| {
diff --git a/src/tools/clippy/clippy_lints/src/bool_to_int_with_if.rs b/src/tools/clippy/clippy_lints/src/bool_to_int_with_if.rs
index cfb76cab6dc23..561ca9bd9866d 100644
--- a/src/tools/clippy/clippy_lints/src/bool_to_int_with_if.rs
+++ b/src/tools/clippy/clippy_lints/src/bool_to_int_with_if.rs
@@ -1,13 +1,11 @@
-use clippy_utils::higher::If;
-use rustc_ast::LitKind;
-use rustc_hir::{Block, ExprKind};
-use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::declare_lint_pass;
-
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::sugg::Sugg;
-use clippy_utils::{in_constant, is_else_clause, is_integer_literal};
+use clippy_utils::{in_constant, is_else_clause};
+use rustc_ast::LitKind;
 use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::declare_lint_pass;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -47,80 +45,64 @@ declare_clippy_lint! {
 declare_lint_pass!(BoolToIntWithIf => [BOOL_TO_INT_WITH_IF]);
 
 impl<'tcx> LateLintPass<'tcx> for BoolToIntWithIf {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tcx>) {
-        if !expr.span.from_expansion() && !in_constant(cx, expr.hir_id) {
-            check_if_else(cx, expr);
-        }
-    }
-}
-
-fn check_if_else<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tcx>) {
-    if let Some(If {
-        cond,
-        then,
-        r#else: Some(r#else),
-    }) = If::hir(expr)
-        && let Some(then_lit) = int_literal(then)
-        && let Some(else_lit) = int_literal(r#else)
-    {
-        let inverted = if is_integer_literal(then_lit, 1) && is_integer_literal(else_lit, 0) {
-            false
-        } else if is_integer_literal(then_lit, 0) && is_integer_literal(else_lit, 1) {
-            true
-        } else {
-            // Expression isn't boolean, exit
-            return;
-        };
-        let mut applicability = Applicability::MachineApplicable;
-        let snippet = {
-            let mut sugg = Sugg::hir_with_applicability(cx, cond, "..", &mut applicability);
-            if inverted {
-                sugg = !sugg;
-            }
-            sugg
-        };
-
-        let ty = cx.typeck_results().expr_ty(then_lit); // then and else must be of same type
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+        if let ExprKind::If(cond, then, Some(else_)) = expr.kind
+            && matches!(cond.kind, ExprKind::DropTemps(_))
+            && let Some(then_lit) = as_int_bool_lit(then)
+            && let Some(else_lit) = as_int_bool_lit(else_)
+            && then_lit != else_lit
+            && !expr.span.from_expansion()
+            && !in_constant(cx, expr.hir_id)
+        {
+            let ty = cx.typeck_results().expr_ty(then);
+            let mut applicability = Applicability::MachineApplicable;
+            let snippet = {
+                let mut sugg = Sugg::hir_with_applicability(cx, cond, "..", &mut applicability);
+                if !then_lit {
+                    sugg = !sugg;
+                }
+                sugg
+            };
+            let suggestion = {
+                let mut s = Sugg::NonParen(format!("{ty}::from({snippet})").into());
+                // when used in else clause if statement should be wrapped in curly braces
+                if is_else_clause(cx.tcx, expr) {
+                    s = s.blockify();
+                }
+                s
+            };
 
-        let suggestion = {
-            let wrap_in_curly = is_else_clause(cx.tcx, expr);
-            let mut s = Sugg::NonParen(format!("{ty}::from({snippet})").into());
-            if wrap_in_curly {
-                s = s.blockify();
-            }
-            s
-        }; // when used in else clause if statement should be wrapped in curly braces
+            let into_snippet = snippet.clone().maybe_par();
+            let as_snippet = snippet.as_ty(ty);
 
-        let into_snippet = snippet.clone().maybe_par();
-        let as_snippet = snippet.as_ty(ty);
-
-        span_lint_and_then(
-            cx,
-            BOOL_TO_INT_WITH_IF,
-            expr.span,
-            "boolean to int conversion using if",
-            |diag| {
-                diag.span_suggestion(expr.span, "replace with from", suggestion, applicability);
-                diag.note(format!(
-                    "`{as_snippet}` or `{into_snippet}.into()` can also be valid options"
-                ));
-            },
-        );
-    };
+            span_lint_and_then(
+                cx,
+                BOOL_TO_INT_WITH_IF,
+                expr.span,
+                "boolean to int conversion using if",
+                |diag| {
+                    diag.span_suggestion(expr.span, "replace with from", suggestion, applicability);
+                    diag.note(format!(
+                        "`{as_snippet}` or `{into_snippet}.into()` can also be valid options"
+                    ));
+                },
+            );
+        }
+    }
 }
 
-// If block contains only a int literal expression, return literal expression
-fn int_literal<'tcx>(expr: &'tcx rustc_hir::Expr<'tcx>) -> Option<&'tcx rustc_hir::Expr<'tcx>> {
-    if let ExprKind::Block(block, _) = expr.kind
-        && let Block {
-            stmts: [], // Shouldn't lint if statements with side effects
-            expr: Some(expr),
-            ..
-        } = block
-        && let ExprKind::Lit(lit) = &expr.kind
-        && let LitKind::Int(_, _) = lit.node
+fn as_int_bool_lit(e: &Expr<'_>) -> Option<bool> {
+    if let ExprKind::Block(b, _) = e.kind
+        && b.stmts.is_empty()
+        && let Some(e) = b.expr
+        && let ExprKind::Lit(lit) = e.kind
+        && let LitKind::Int(x, _) = lit.node
     {
-        Some(expr)
+        match x.get() {
+            0 => Some(false),
+            1 => Some(true),
+            _ => None,
+        }
     } else {
         None
     }
diff --git a/src/tools/clippy/clippy_lints/src/byte_char_slices.rs b/src/tools/clippy/clippy_lints/src/byte_char_slices.rs
new file mode 100644
index 0000000000000..a9fe190f1777e
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/byte_char_slices.rs
@@ -0,0 +1,80 @@
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use rustc_ast::ast::{BorrowKind, Expr, ExprKind, Mutability};
+use rustc_ast::token::{Lit, LitKind};
+use rustc_errors::Applicability;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_session::declare_lint_pass;
+
+declare_clippy_lint! {
+    /// ### What it does
+    /// Checks for hard to read slices of byte characters, that could be more easily expressed as a
+    /// byte string.
+    ///
+    /// ### Why is this bad?
+    ///
+    /// Potentially makes the string harder to read.
+    ///
+    /// ### Example
+    /// ```ignore
+    /// &[b'H', b'e', b'l', b'l', b'o'];
+    /// ```
+    /// Use instead:
+    /// ```ignore
+    /// b"Hello"
+    /// ```
+    #[clippy::version = "1.68.0"]
+    pub BYTE_CHAR_SLICES,
+    style,
+    "hard to read byte char slice"
+}
+declare_lint_pass!(ByteCharSlice => [BYTE_CHAR_SLICES]);
+
+impl EarlyLintPass for ByteCharSlice {
+    fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
+        if let Some(slice) = is_byte_char_slices(expr)
+            && !expr.span.from_expansion()
+        {
+            span_lint_and_sugg(
+                cx,
+                BYTE_CHAR_SLICES,
+                expr.span,
+                "can be more succinctly written as a byte str",
+                "try",
+                format!("b\"{slice}\""),
+                Applicability::MaybeIncorrect,
+            );
+        }
+    }
+}
+
+fn is_byte_char_slices(expr: &Expr) -> Option<String> {
+    if let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, expr) = &expr.kind {
+        match &expr.kind {
+            ExprKind::Array(members) => {
+                if members.is_empty() {
+                    return None;
+                }
+
+                members
+                    .iter()
+                    .map(|member| match &member.kind {
+                        ExprKind::Lit(Lit {
+                            kind: LitKind::Byte,
+                            symbol,
+                            ..
+                        }) => Some(symbol.as_str()),
+                        _ => None,
+                    })
+                    .map(|maybe_quote| match maybe_quote {
+                        Some("\"") => Some("\\\""),
+                        Some("\\'") => Some("'"),
+                        other => other,
+                    })
+                    .collect::<Option<String>>()
+            },
+            _ => None,
+        }
+    } else {
+        None
+    }
+}
diff --git a/src/tools/clippy/clippy_lints/src/casts/mod.rs b/src/tools/clippy/clippy_lints/src/casts/mod.rs
index e60c36ced75da..54f0c7c468719 100644
--- a/src/tools/clippy/clippy_lints/src/casts/mod.rs
+++ b/src/tools/clippy/clippy_lints/src/casts/mod.rs
@@ -32,7 +32,7 @@ use rustc_session::impl_lint_pass;
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts from any numerical to a float type where
+    /// Checks for casts from any numeric type to a float type where
     /// the receiving type cannot store all values from the original type without
     /// rounding errors. This possible rounding is to be expected, so this lint is
     /// `Allow` by default.
@@ -58,14 +58,14 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts from a signed to an unsigned numerical
+    /// Checks for casts from a signed to an unsigned numeric
     /// type. In this case, negative values wrap around to large positive values,
-    /// which can be quite surprising in practice. However, as the cast works as
+    /// which can be quite surprising in practice. However, since the cast works as
     /// defined, this lint is `Allow` by default.
     ///
     /// ### Why is this bad?
     /// Possibly surprising results. You can activate this lint
-    /// as a one-time check to see where numerical wrapping can arise.
+    /// as a one-time check to see where numeric wrapping can arise.
     ///
     /// ### Example
     /// ```no_run
@@ -80,7 +80,7 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts between numerical types that may
+    /// Checks for casts between numeric types that may
     /// truncate large values. This is expected behavior, so the cast is `Allow` by
     /// default. It suggests user either explicitly ignore the lint,
     /// or use `try_from()` and handle the truncation, default, or panic explicitly.
@@ -120,17 +120,16 @@ declare_clippy_lint! {
 declare_clippy_lint! {
     /// ### What it does
     /// Checks for casts from an unsigned type to a signed type of
-    /// the same size, or possibly smaller due to target dependent integers.
-    /// Performing such a cast is a 'no-op' for the compiler, i.e., nothing is
-    /// changed at the bit level, and the binary representation of the value is
+    /// the same size, or possibly smaller due to target-dependent integers.
+    /// Performing such a cast is a no-op for the compiler (that is, nothing is
+    /// changed at the bit level), and the binary representation of the value is
     /// reinterpreted. This can cause wrapping if the value is too big
     /// for the target signed type. However, the cast works as defined, so this lint
     /// is `Allow` by default.
     ///
     /// ### Why is this bad?
     /// While such a cast is not bad in itself, the results can
-    /// be surprising when this is not the intended behavior, as demonstrated by the
-    /// example below.
+    /// be surprising when this is not the intended behavior:
     ///
     /// ### Example
     /// ```no_run
@@ -144,16 +143,16 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts between numerical types that may
-    /// be replaced by safe conversion functions.
+    /// Checks for casts between numeric types that can be replaced by safe
+    /// conversion functions.
     ///
     /// ### Why is this bad?
-    /// Rust's `as` keyword will perform many kinds of
-    /// conversions, including silently lossy conversions. Conversion functions such
-    /// as `i32::from` will only perform lossless conversions. Using the conversion
-    /// functions prevents conversions from turning into silent lossy conversions if
-    /// the types of the input expressions ever change, and make it easier for
-    /// people reading the code to know that the conversion is lossless.
+    /// Rust's `as` keyword will perform many kinds of conversions, including
+    /// silently lossy conversions. Conversion functions such as `i32::from`
+    /// will only perform lossless conversions. Using the conversion functions
+    /// prevents conversions from becoming silently lossy if the input types
+    /// ever change, and makes it clear for people reading the code that the
+    /// conversion is lossless.
     ///
     /// ### Example
     /// ```no_run
@@ -177,19 +176,21 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts to the same type, casts of int literals to integer types, casts of float
-    /// literals to float types and casts between raw pointers without changing type or constness.
+    /// Checks for casts to the same type, casts of int literals to integer
+    /// types, casts of float literals to float types, and casts between raw
+    /// pointers that don't change type or constness.
     ///
     /// ### Why is this bad?
     /// It's just unnecessary.
     ///
     /// ### Known problems
-    /// When the expression on the left is a function call, the lint considers the return type to be
-    /// a type alias if it's aliased through a `use` statement
-    /// (like `use std::io::Result as IoResult`). It will not lint such cases.
+    /// When the expression on the left is a function call, the lint considers
+    /// the return type to be a type alias if it's aliased through a `use`
+    /// statement (like `use std::io::Result as IoResult`). It will not lint
+    /// such cases.
     ///
-    /// This check is also rather primitive. It will only work on primitive types without any
-    /// intermediate references, raw pointers and trait objects may or may not work.
+    /// This check will only work on primitive types without any intermediate
+    /// references: raw pointers and trait objects may or may not work.
     ///
     /// ### Example
     /// ```no_run
@@ -211,17 +212,17 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts, using `as` or `pointer::cast`,
-    /// from a less-strictly-aligned pointer to a more-strictly-aligned pointer
+    /// Checks for casts, using `as` or `pointer::cast`, from a
+    /// less strictly aligned pointer to a more strictly aligned pointer.
     ///
     /// ### Why is this bad?
-    /// Dereferencing the resulting pointer may be undefined
-    /// behavior.
+    /// Dereferencing the resulting pointer may be undefined behavior.
     ///
     /// ### Known problems
-    /// Using `std::ptr::read_unaligned` and `std::ptr::write_unaligned` or similar
-    /// on the resulting pointer is fine. Is over-zealous: Casts with manual alignment checks or casts like
-    /// u64-> u8 -> u16 can be fine. Miri is able to do a more in-depth analysis.
+    /// Using [`std::ptr::read_unaligned`](https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html) and [`std::ptr::write_unaligned`](https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html) or
+    /// similar on the resulting pointer is fine. Is over-zealous: casts with
+    /// manual alignment checks or casts like `u64` -> `u8` -> `u16` can be
+    /// fine. Miri is able to do a more in-depth analysis.
     ///
     /// ### Example
     /// ```no_run
@@ -234,20 +235,21 @@ declare_clippy_lint! {
     #[clippy::version = "pre 1.29.0"]
     pub CAST_PTR_ALIGNMENT,
     pedantic,
-    "cast from a pointer to a more-strictly-aligned pointer"
+    "cast from a pointer to a more strictly aligned pointer"
 }
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts of function pointers to something other than usize
+    /// Checks for casts of function pointers to something other than `usize`.
     ///
     /// ### Why is this bad?
-    /// Casting a function pointer to anything other than usize/isize is not portable across
-    /// architectures, because you end up losing bits if the target type is too small or end up with a
-    /// bunch of extra bits that waste space and add more instructions to the final binary than
-    /// strictly necessary for the problem
+    /// Casting a function pointer to anything other than `usize`/`isize` is
+    /// not portable across architectures. If the target type is too small the
+    /// address would be truncated, and target types larger than `usize` are
+    /// unnecessary.
     ///
-    /// Casting to isize also doesn't make sense since there are no signed addresses.
+    /// Casting to `isize` also doesn't make sense, since addresses are never
+    /// signed.
     ///
     /// ### Example
     /// ```no_run
@@ -263,17 +265,17 @@ declare_clippy_lint! {
     #[clippy::version = "pre 1.29.0"]
     pub FN_TO_NUMERIC_CAST,
     style,
-    "casting a function pointer to a numeric type other than usize"
+    "casting a function pointer to a numeric type other than `usize`"
 }
 
 declare_clippy_lint! {
     /// ### What it does
     /// Checks for casts of a function pointer to a numeric type not wide enough to
-    /// store address.
+    /// store an address.
     ///
     /// ### Why is this bad?
     /// Such a cast discards some bits of the function's address. If this is intended, it would be more
-    /// clearly expressed by casting to usize first, then casting the usize to the intended type (with
+    /// clearly expressed by casting to `usize` first, then casting the `usize` to the intended type (with
     /// a comment) to perform the truncation.
     ///
     /// ### Example
@@ -306,7 +308,7 @@ declare_clippy_lint! {
     /// ### Why restrict this?
     /// Casting a function pointer to an integer can have surprising results and can occur
     /// accidentally if parentheses are omitted from a function call. If you aren't doing anything
-    /// low-level with function pointers then you can opt-out of casting functions to integers in
+    /// low-level with function pointers then you can opt out of casting functions to integers in
     /// order to avoid mistakes. Alternatively, you can use this lint to audit all uses of function
     /// pointer casts in your code.
     ///
@@ -349,8 +351,8 @@ declare_clippy_lint! {
     /// ### Why is this bad?
     /// In general, casting values to smaller types is
     /// error-prone and should be avoided where possible. In the particular case of
-    /// converting a character literal to u8, it is easy to avoid by just using a
-    /// byte literal instead. As an added bonus, `b'a'` is even slightly shorter
+    /// converting a character literal to `u8`, it is easy to avoid by just using a
+    /// byte literal instead. As an added bonus, `b'a'` is also slightly shorter
     /// than `'a' as u8`.
     ///
     /// ### Example
@@ -371,12 +373,13 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for `as` casts between raw pointers without changing its mutability,
-    /// namely `*const T` to `*const U` and `*mut T` to `*mut U`.
+    /// Checks for `as` casts between raw pointers that don't change their
+    /// constness, namely `*const T` to `*const U` and `*mut T` to `*mut U`.
     ///
     /// ### Why is this bad?
-    /// Though `as` casts between raw pointers are not terrible, `pointer::cast` is safer because
-    /// it cannot accidentally change the pointer's mutability nor cast the pointer to other types like `usize`.
+    /// Though `as` casts between raw pointers are not terrible,
+    /// `pointer::cast` is safer because it cannot accidentally change the
+    /// pointer's mutability, nor cast the pointer to other types like `usize`.
     ///
     /// ### Example
     /// ```no_run
@@ -395,12 +398,12 @@ declare_clippy_lint! {
     #[clippy::version = "1.51.0"]
     pub PTR_AS_PTR,
     pedantic,
-    "casting using `as` from and to raw pointers that doesn't change its mutability, where `pointer::cast` could take the place of `as`"
+    "casting using `as` between raw pointers that doesn't change their constness, where `pointer::cast` could take the place of `as`"
 }
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for `as` casts between raw pointers which change its constness, namely `*const T` to
+    /// Checks for `as` casts between raw pointers that change their constness, namely `*const T` to
     /// `*mut T` and `*mut T` to `*const T`.
     ///
     /// ### Why is this bad?
@@ -423,12 +426,12 @@ declare_clippy_lint! {
     #[clippy::version = "1.72.0"]
     pub PTR_CAST_CONSTNESS,
     pedantic,
-    "casting using `as` from and to raw pointers to change constness when specialized methods apply"
+    "casting using `as` on raw pointers to change constness when specialized methods apply"
 }
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for casts from an enum type to an integral type which will definitely truncate the
+    /// Checks for casts from an enum type to an integral type that will definitely truncate the
     /// value.
     ///
     /// ### Why is this bad?
@@ -442,7 +445,7 @@ declare_clippy_lint! {
     #[clippy::version = "1.61.0"]
     pub CAST_ENUM_TRUNCATION,
     suspicious,
-    "casts from an enum type to an integral type which will truncate the value"
+    "casts from an enum type to an integral type that will truncate the value"
 }
 
 declare_clippy_lint! {
@@ -621,7 +624,7 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for the result of a `&self`-taking `as_ptr` being cast to a mutable pointer
+    /// Checks for the result of a `&self`-taking `as_ptr` being cast to a mutable pointer.
     ///
     /// ### Why is this bad?
     /// Since `as_ptr` takes a `&self`, the pointer won't have write permissions unless interior
diff --git a/src/tools/clippy/clippy_lints/src/casts/ptr_as_ptr.rs b/src/tools/clippy/clippy_lints/src/casts/ptr_as_ptr.rs
index 2c168405ee260..86c5f6b9f0ba0 100644
--- a/src/tools/clippy/clippy_lints/src/casts/ptr_as_ptr.rs
+++ b/src/tools/clippy/clippy_lints/src/casts/ptr_as_ptr.rs
@@ -92,7 +92,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, msrv: &Msrv) {
             cx,
             PTR_AS_PTR,
             expr.span,
-            "`as` casting between raw pointers without changing its mutability",
+            "`as` casting between raw pointers without changing their constness",
             help,
             final_suggestion,
             app,
diff --git a/src/tools/clippy/clippy_lints/src/cfg_not_test.rs b/src/tools/clippy/clippy_lints/src/cfg_not_test.rs
new file mode 100644
index 0000000000000..b54f392bf2fad
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/cfg_not_test.rs
@@ -0,0 +1,60 @@
+use clippy_utils::diagnostics::span_lint_and_then;
+use rustc_ast::NestedMetaItem;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_session::declare_lint_pass;
+
+declare_clippy_lint! {
+    /// ### What it does
+    /// Checks for usage of `cfg` that excludes code from `test` builds. (i.e., `#{cfg(not(test))]`)
+    ///
+    /// ### Why is this bad?
+    /// This may give the false impression that a codebase has 100% coverage, yet actually has untested code.
+    /// Enabling this also guards against excessive mockery as well, which is an anti-pattern.
+    ///
+    /// ### Example
+    /// ```rust
+    /// # fn important_check() {}
+    /// #[cfg(not(test))]
+    /// important_check(); // I'm not actually tested, but not including me will falsely increase coverage!
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// # fn important_check() {}
+    /// important_check();
+    /// ```
+    #[clippy::version = "1.73.0"]
+    pub CFG_NOT_TEST,
+    restriction,
+    "enforce against excluding code from test builds"
+}
+
+declare_lint_pass!(CfgNotTest => [CFG_NOT_TEST]);
+
+impl EarlyLintPass for CfgNotTest {
+    fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &rustc_ast::Attribute) {
+        if attr.has_name(rustc_span::sym::cfg) && contains_not_test(attr.meta_item_list().as_deref(), false) {
+            span_lint_and_then(
+                cx,
+                CFG_NOT_TEST,
+                attr.span,
+                "code is excluded from test builds",
+                |diag| {
+                    diag.help("consider not excluding any code from test builds");
+                    diag.note_once("this could increase code coverage despite not actually being tested");
+                },
+            );
+        }
+    }
+}
+
+fn contains_not_test(list: Option<&[NestedMetaItem]>, not: bool) -> bool {
+    list.is_some_and(|list| {
+        list.iter().any(|item| {
+            item.ident().is_some_and(|ident| match ident.name {
+                rustc_span::sym::not => contains_not_test(item.meta_item_list(), !not),
+                rustc_span::sym::test => not,
+                _ => contains_not_test(item.meta_item_list(), not),
+            })
+        })
+    })
+}
diff --git a/src/tools/clippy/clippy_lints/src/declared_lints.rs b/src/tools/clippy/clippy_lints/src/declared_lints.rs
index 638de5e818c8e..eabc67601a2f1 100644
--- a/src/tools/clippy/clippy_lints/src/declared_lints.rs
+++ b/src/tools/clippy/clippy_lints/src/declared_lints.rs
@@ -8,8 +8,6 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     #[cfg(feature = "internal")]
     crate::utils::internal_lints::collapsible_calls::COLLAPSIBLE_SPAN_LINT_CALLS_INFO,
     #[cfg(feature = "internal")]
-    crate::utils::internal_lints::compiler_lint_functions::COMPILER_LINT_FUNCTIONS_INFO,
-    #[cfg(feature = "internal")]
     crate::utils::internal_lints::interning_defined_symbol::INTERNING_DEFINED_SYMBOL_INFO,
     #[cfg(feature = "internal")]
     crate::utils::internal_lints::interning_defined_symbol::UNNECESSARY_SYMBOL_STR_INFO,
@@ -73,6 +71,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::booleans::OVERLY_COMPLEX_BOOL_EXPR_INFO,
     crate::borrow_deref_ref::BORROW_DEREF_REF_INFO,
     crate::box_default::BOX_DEFAULT_INFO,
+    crate::byte_char_slices::BYTE_CHAR_SLICES_INFO,
     crate::cargo::CARGO_COMMON_METADATA_INFO,
     crate::cargo::LINT_GROUPS_PRIORITY_INFO,
     crate::cargo::MULTIPLE_CRATE_VERSIONS_INFO,
@@ -103,6 +102,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::casts::REF_AS_PTR_INFO,
     crate::casts::UNNECESSARY_CAST_INFO,
     crate::casts::ZERO_PTR_INFO,
+    crate::cfg_not_test::CFG_NOT_TEST_INFO,
     crate::checked_conversions::CHECKED_CONVERSIONS_INFO,
     crate::cognitive_complexity::COGNITIVE_COMPLEXITY_INFO,
     crate::collapsible_if::COLLAPSIBLE_ELSE_IF_INFO,
@@ -313,6 +313,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::manual_range_patterns::MANUAL_RANGE_PATTERNS_INFO,
     crate::manual_rem_euclid::MANUAL_REM_EUCLID_INFO,
     crate::manual_retain::MANUAL_RETAIN_INFO,
+    crate::manual_rotate::MANUAL_ROTATE_INFO,
     crate::manual_slice_size_calculation::MANUAL_SLICE_SIZE_CALCULATION_INFO,
     crate::manual_string_new::MANUAL_STRING_NEW_INFO,
     crate::manual_strip::MANUAL_STRIP_INFO,
@@ -503,6 +504,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::missing_assert_message::MISSING_ASSERT_MESSAGE_INFO,
     crate::missing_asserts_for_indexing::MISSING_ASSERTS_FOR_INDEXING_INFO,
     crate::missing_const_for_fn::MISSING_CONST_FOR_FN_INFO,
+    crate::missing_const_for_thread_local::MISSING_CONST_FOR_THREAD_LOCAL_INFO,
     crate::missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS_INFO,
     crate::missing_enforced_import_rename::MISSING_ENFORCED_IMPORT_RENAMES_INFO,
     crate::missing_fields_in_debug::MISSING_FIELDS_IN_DEBUG_INFO,
@@ -585,12 +587,12 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::operators::VERBOSE_BIT_MASK_INFO,
     crate::option_env_unwrap::OPTION_ENV_UNWRAP_INFO,
     crate::option_if_let_else::OPTION_IF_LET_ELSE_INFO,
-    crate::overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL_INFO,
     crate::panic_in_result_fn::PANIC_IN_RESULT_FN_INFO,
     crate::panic_unimplemented::PANIC_INFO,
     crate::panic_unimplemented::TODO_INFO,
     crate::panic_unimplemented::UNIMPLEMENTED_INFO,
     crate::panic_unimplemented::UNREACHABLE_INFO,
+    crate::panicking_overflow_checks::PANICKING_OVERFLOW_CHECKS_INFO,
     crate::partial_pub_fields::PARTIAL_PUB_FIELDS_INFO,
     crate::partialeq_ne_impl::PARTIALEQ_NE_IMPL_INFO,
     crate::partialeq_to_none::PARTIALEQ_TO_NONE_INFO,
@@ -644,6 +646,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::semicolon_block::SEMICOLON_OUTSIDE_BLOCK_INFO,
     crate::semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED_INFO,
     crate::serde_api::SERDE_API_MISUSE_INFO,
+    crate::set_contains_or_insert::SET_CONTAINS_OR_INSERT_INFO,
     crate::shadow::SHADOW_REUSE_INFO,
     crate::shadow::SHADOW_SAME_INFO,
     crate::shadow::SHADOW_UNRELATED_INFO,
@@ -679,7 +682,6 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::tabs_in_doc_comments::TABS_IN_DOC_COMMENTS_INFO,
     crate::temporary_assignment::TEMPORARY_ASSIGNMENT_INFO,
     crate::tests_outside_test_module::TESTS_OUTSIDE_TEST_MODULE_INFO,
-    crate::thread_local_initializer_can_be_made_const::THREAD_LOCAL_INITIALIZER_CAN_BE_MADE_CONST_INFO,
     crate::to_digit_is_some::TO_DIGIT_IS_SOME_INFO,
     crate::to_string_trait_impl::TO_STRING_TRAIT_IMPL_INFO,
     crate::trailing_empty_array::TRAILING_EMPTY_ARRAY_INFO,
diff --git a/src/tools/clippy/clippy_lints/src/default.rs b/src/tools/clippy/clippy_lints/src/default.rs
index 2b3f4854255cf..72fa05be3cc60 100644
--- a/src/tools/clippy/clippy_lints/src/default.rs
+++ b/src/tools/clippy/clippy_lints/src/default.rs
@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::{span_lint_and_note, span_lint_and_sugg};
 use clippy_utils::source::snippet_with_context;
 use clippy_utils::ty::{has_drop, is_copy};
-use clippy_utils::{any_parent_is_automatically_derived, contains_name, get_parent_expr, is_from_proc_macro};
+use clippy_utils::{contains_name, get_parent_expr, in_automatically_derived, is_from_proc_macro};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
 use rustc_hir::def::Res;
@@ -84,7 +84,7 @@ impl<'tcx> LateLintPass<'tcx> for Default {
             // Avoid cases already linted by `field_reassign_with_default`
             && !self.reassigned_linted.contains(&expr.span)
             && let ExprKind::Call(path, ..) = expr.kind
-            && !any_parent_is_automatically_derived(cx.tcx, expr.hir_id)
+            && !in_automatically_derived(cx.tcx, expr.hir_id)
             && let ExprKind::Path(ref qpath) = path.kind
             && let Some(def_id) = cx.qpath_res(qpath, path.hir_id).opt_def_id()
             && cx.tcx.is_diagnostic_item(sym::default_fn, def_id)
@@ -113,9 +113,9 @@ impl<'tcx> LateLintPass<'tcx> for Default {
         // start from the `let mut _ = _::default();` and look at all the following
         // statements, see if they re-assign the fields of the binding
         let stmts_head = match block.stmts {
+            [] | [_] => return,
             // Skip the last statement since there cannot possibly be any following statements that re-assign fields.
-            [head @ .., _] if !head.is_empty() => head,
-            _ => return,
+            [head @ .., _] => head,
         };
         for (stmt_idx, stmt) in stmts_head.iter().enumerate() {
             // find all binding statements like `let mut _ = T::default()` where `T::default()` is the
@@ -124,7 +124,7 @@ impl<'tcx> LateLintPass<'tcx> for Default {
             let (local, variant, binding_name, binding_type, span) = if let StmtKind::Let(local) = stmt.kind
                 // only take `let ...` statements
                 && let Some(expr) = local.init
-                && !any_parent_is_automatically_derived(cx.tcx, expr.hir_id)
+                && !in_automatically_derived(cx.tcx, expr.hir_id)
                 && !expr.span.from_expansion()
                 // only take bindings to identifiers
                 && let PatKind::Binding(_, binding_id, ident, _) = local.pat.kind
diff --git a/src/tools/clippy/clippy_lints/src/default_numeric_fallback.rs b/src/tools/clippy/clippy_lints/src/default_numeric_fallback.rs
index ff631909bcb58..9af73db6849f4 100644
--- a/src/tools/clippy/clippy_lints/src/default_numeric_fallback.rs
+++ b/src/tools/clippy/clippy_lints/src/default_numeric_fallback.rs
@@ -50,6 +50,8 @@ declare_lint_pass!(DefaultNumericFallback => [DEFAULT_NUMERIC_FALLBACK]);
 impl<'tcx> LateLintPass<'tcx> for DefaultNumericFallback {
     fn check_body(&mut self, cx: &LateContext<'tcx>, body: &Body<'tcx>) {
         let hir = cx.tcx.hir();
+        // NOTE: this is different from `clippy_utils::is_inside_always_const_context`.
+        // Inline const supports type inference.
         let is_parent_const = matches!(
             hir.body_const_context(hir.body_owner_def_id(body.id())),
             Some(ConstContext::Const { inline: false } | ConstContext::Static(_))
diff --git a/src/tools/clippy/clippy_lints/src/dereference.rs b/src/tools/clippy/clippy_lints/src/dereference.rs
index a115f8d063140..253f9959e13e7 100644
--- a/src/tools/clippy/clippy_lints/src/dereference.rs
+++ b/src/tools/clippy/clippy_lints/src/dereference.rs
@@ -3,7 +3,8 @@ use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
 use clippy_utils::sugg::has_enclosing_paren;
 use clippy_utils::ty::{implements_trait, is_manually_drop, peel_mid_ty_refs};
 use clippy_utils::{
-    expr_use_ctxt, get_parent_expr, is_block_like, is_lint_allowed, path_to_local, DefinedTy, ExprUseNode,
+    expr_use_ctxt, get_parent_expr, is_block_like, is_lint_allowed, path_to_local, peel_middle_ty_refs, DefinedTy,
+    ExprUseNode,
 };
 use core::mem;
 use rustc_ast::util::parser::{PREC_PREFIX, PREC_UNAMBIGUOUS};
@@ -175,6 +176,7 @@ struct StateData<'tcx> {
     adjusted_ty: Ty<'tcx>,
 }
 
+#[derive(Debug)]
 struct DerefedBorrow {
     count: usize,
     msg: &'static str,
@@ -182,6 +184,7 @@ struct DerefedBorrow {
     for_field_access: Option<Symbol>,
 }
 
+#[derive(Debug)]
 enum State {
     // Any number of deref method calls.
     DerefMethod {
@@ -744,7 +747,7 @@ fn in_postfix_position<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'tcx>) -> boo
     }
 }
 
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Debug)]
 enum TyCoercionStability {
     Deref,
     Reborrow,
@@ -1042,16 +1045,28 @@ fn report<'tcx>(
                 return;
             }
 
-            let (prefix, precedence) = if let Some(mutability) = mutability
-                && !typeck.expr_ty(expr).is_ref()
+            let ty = typeck.expr_ty(expr);
+
+            // `&&[T; N]`, or `&&..&[T; N]` (src) cannot coerce to `&[T]` (dst).
+            if let ty::Ref(_, dst, _) = data.adjusted_ty.kind()
+                && dst.is_slice()
             {
-                let prefix = match mutability {
-                    Mutability::Not => "&",
-                    Mutability::Mut => "&mut ",
-                };
-                (prefix, PREC_PREFIX)
-            } else {
-                ("", 0)
+                let (src, n_src_refs) = peel_middle_ty_refs(ty);
+                if n_src_refs >= 2 && src.is_array() {
+                    return;
+                }
+            }
+
+            let (prefix, precedence) = match mutability {
+                Some(mutability) if !ty.is_ref() => {
+                    let prefix = match mutability {
+                        Mutability::Not => "&",
+                        Mutability::Mut => "&mut ",
+                    };
+                    (prefix, PREC_PREFIX)
+                },
+                None if !ty.is_ref() && data.adjusted_ty.is_ref() => ("&", 0),
+                _ => ("", 0),
             };
             span_lint_hir_and_then(
                 cx,
diff --git a/src/tools/clippy/clippy_lints/src/disallowed_methods.rs b/src/tools/clippy/clippy_lints/src/disallowed_methods.rs
index 9de879604e2ec..38fe687f7ccfe 100644
--- a/src/tools/clippy/clippy_lints/src/disallowed_methods.rs
+++ b/src/tools/clippy/clippy_lints/src/disallowed_methods.rs
@@ -1,6 +1,6 @@
 use clippy_config::types::DisallowedPath;
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::{fn_def_id, get_parent_expr, path_def_id};
+use rustc_hir::def::{CtorKind, DefKind, Res};
 use rustc_hir::def_id::DefIdMap;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
@@ -83,26 +83,26 @@ impl<'tcx> LateLintPass<'tcx> for DisallowedMethods {
     }
 
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        let uncalled_path = if let Some(parent) = get_parent_expr(cx, expr)
-            && let ExprKind::Call(receiver, _) = parent.kind
-            && receiver.hir_id == expr.hir_id
-        {
-            None
-        } else {
-            path_def_id(cx, expr)
+        let (id, span) = match &expr.kind {
+            ExprKind::Path(path)
+                if let Res::Def(DefKind::Fn | DefKind::Ctor(_, CtorKind::Fn) | DefKind::AssocFn, id) =
+                    cx.qpath_res(path, expr.hir_id) =>
+            {
+                (id, expr.span)
+            },
+            ExprKind::MethodCall(name, ..) if let Some(id) = cx.typeck_results().type_dependent_def_id(expr.hir_id) => {
+                (id, name.ident.span)
+            },
+            _ => return,
         };
-        let Some(def_id) = uncalled_path.or_else(|| fn_def_id(cx, expr)) else {
-            return;
-        };
-        let conf = match self.disallowed.get(&def_id) {
-            Some(&index) => &self.conf_disallowed[index],
-            None => return,
-        };
-        let msg = format!("use of a disallowed method `{}`", conf.path());
-        span_lint_and_then(cx, DISALLOWED_METHODS, expr.span, msg, |diag| {
-            if let Some(reason) = conf.reason() {
-                diag.note(reason);
-            }
-        });
+        if let Some(&index) = self.disallowed.get(&id) {
+            let conf = &self.conf_disallowed[index];
+            let msg = format!("use of a disallowed method `{}`", conf.path());
+            span_lint_and_then(cx, DISALLOWED_METHODS, span, msg, |diag| {
+                if let Some(reason) = conf.reason() {
+                    diag.note(reason);
+                }
+            });
+        }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/disallowed_names.rs b/src/tools/clippy/clippy_lints/src/disallowed_names.rs
index 2afbf184117e1..58809604c373e 100644
--- a/src/tools/clippy/clippy_lints/src/disallowed_names.rs
+++ b/src/tools/clippy/clippy_lints/src/disallowed_names.rs
@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::is_test_module_or_function;
+use clippy_utils::is_in_test;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_hir::{Item, Pat, PatKind};
+use rustc_hir::{Pat, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::impl_lint_pass;
 
@@ -27,52 +27,30 @@ declare_clippy_lint! {
 #[derive(Clone, Debug)]
 pub struct DisallowedNames {
     disallow: FxHashSet<String>,
-    test_modules_deep: u32,
 }
 
 impl DisallowedNames {
     pub fn new(disallowed_names: &[String]) -> Self {
         Self {
             disallow: disallowed_names.iter().cloned().collect(),
-            test_modules_deep: 0,
         }
     }
-
-    fn in_test_module(&self) -> bool {
-        self.test_modules_deep != 0
-    }
 }
 
 impl_lint_pass!(DisallowedNames => [DISALLOWED_NAMES]);
 
 impl<'tcx> LateLintPass<'tcx> for DisallowedNames {
-    fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
-        if is_test_module_or_function(cx.tcx, item) {
-            self.test_modules_deep = self.test_modules_deep.saturating_add(1);
-        }
-    }
-
     fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
-        // Check whether we are under the `test` attribute.
-        if self.in_test_module() {
-            return;
-        }
-
-        if let PatKind::Binding(.., ident, _) = pat.kind {
-            if self.disallow.contains(&ident.name.to_string()) {
-                span_lint(
-                    cx,
-                    DISALLOWED_NAMES,
-                    ident.span,
-                    format!("use of a disallowed/placeholder name `{}`", ident.name),
-                );
-            }
-        }
-    }
-
-    fn check_item_post(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
-        if is_test_module_or_function(cx.tcx, item) {
-            self.test_modules_deep = self.test_modules_deep.saturating_sub(1);
+        if let PatKind::Binding(.., ident, _) = pat.kind
+            && self.disallow.contains(&ident.name.to_string())
+            && !is_in_test(cx.tcx, pat.hir_id)
+        {
+            span_lint(
+                cx,
+                DISALLOWED_NAMES,
+                ident.span,
+                format!("use of a disallowed/placeholder name `{}`", ident.name),
+            );
         }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/disallowed_script_idents.rs b/src/tools/clippy/clippy_lints/src/disallowed_script_idents.rs
index a995f06fb73dc..5ce11900adf8f 100644
--- a/src/tools/clippy/clippy_lints/src/disallowed_script_idents.rs
+++ b/src/tools/clippy/clippy_lints/src/disallowed_script_idents.rs
@@ -82,30 +82,25 @@ impl EarlyLintPass for DisallowedScriptIdents {
             // Note: `symbol.as_str()` is an expensive operation, thus should not be called
             // more than once for a single symbol.
             let symbol_str = symbol.as_str();
-            if symbol_str.is_ascii() {
-                continue;
-            }
 
-            for c in symbol_str.chars() {
-                // We want to iterate through all the scripts associated with this character
-                // and check whether at least of one scripts is in the whitelist.
-                let forbidden_script = c
-                    .script_extension()
-                    .iter()
-                    .find(|script| !self.whitelist.contains(script));
-                if let Some(script) = forbidden_script {
-                    span_lint(
-                        cx,
-                        DISALLOWED_SCRIPT_IDENTS,
-                        span,
-                        format!(
-                            "identifier `{symbol_str}` has a Unicode script that is not allowed by configuration: {}",
-                            script.full_name()
-                        ),
-                    );
-                    // We don't want to spawn warning multiple times over a single identifier.
-                    break;
-                }
+            // Check if any character in the symbol is not part of any allowed script.
+            // Fast path for ascii-only idents.
+            if !symbol_str.is_ascii()
+                && let Some(script) = symbol_str.chars().find_map(|c| {
+                    c.script_extension()
+                        .iter()
+                        .find(|script| !self.whitelist.contains(script))
+                })
+            {
+                span_lint(
+                    cx,
+                    DISALLOWED_SCRIPT_IDENTS,
+                    span,
+                    format!(
+                        "identifier `{symbol_str}` has a Unicode script that is not allowed by configuration: {}",
+                        script.full_name()
+                    ),
+                );
             }
         }
     }
diff --git a/src/tools/clippy/clippy_lints/src/doc/lazy_continuation.rs b/src/tools/clippy/clippy_lints/src/doc/lazy_continuation.rs
index 38bc58a550196..bd1cc46e1850e 100644
--- a/src/tools/clippy/clippy_lints/src/doc/lazy_continuation.rs
+++ b/src/tools/clippy/clippy_lints/src/doc/lazy_continuation.rs
@@ -22,6 +22,7 @@ pub(super) fn check(
     range: Range<usize>,
     mut span: Span,
     containers: &[super::Container],
+    line_break_span: Span,
 ) {
     if doc[range.clone()].contains('\t') {
         // We don't do tab stops correctly.
@@ -46,11 +47,35 @@ pub(super) fn check(
         .sum();
     if ccount < blockquote_level || lcount < list_indentation {
         let msg = if ccount < blockquote_level {
-            "doc quote missing `>` marker"
+            "doc quote line without `>` marker"
         } else {
-            "doc list item missing indentation"
+            "doc list item without indentation"
         };
         span_lint_and_then(cx, DOC_LAZY_CONTINUATION, span, msg, |diag| {
+            let snippet = clippy_utils::source::snippet(cx, line_break_span, "");
+            if snippet.chars().filter(|&c| c == '\n').count() > 1
+                && let Some(doc_comment_start) = snippet.rfind('\n')
+                && let doc_comment = snippet[doc_comment_start..].trim()
+                && (doc_comment == "///" || doc_comment == "//!")
+            {
+                // suggest filling in a blank line
+                diag.span_suggestion_with_style(
+                    line_break_span.shrink_to_lo(),
+                    "if this should be its own paragraph, add a blank doc comment line",
+                    format!("\n{doc_comment}"),
+                    Applicability::MaybeIncorrect,
+                    SuggestionStyle::ShowAlways,
+                );
+                if ccount > 0 || blockquote_level > 0 {
+                    diag.help("if this not intended to be a quote at all, escape it with `\\>`");
+                } else {
+                    let indent = list_indentation - lcount;
+                    diag.help(format!(
+                        "if this is intended to be part of the list, indent {indent} spaces"
+                    ));
+                }
+                return;
+            }
             if ccount == 0 && blockquote_level == 0 {
                 // simpler suggestion style for indentation
                 let indent = list_indentation - lcount;
diff --git a/src/tools/clippy/clippy_lints/src/doc/mod.rs b/src/tools/clippy/clippy_lints/src/doc/mod.rs
index 3e210fd153bf5..a2a1a51920f35 100644
--- a/src/tools/clippy/clippy_lints/src/doc/mod.rs
+++ b/src/tools/clippy/clippy_lints/src/doc/mod.rs
@@ -6,7 +6,8 @@ use clippy_utils::ty::is_type_diagnostic_item;
 use clippy_utils::visitors::Visitable;
 use clippy_utils::{in_constant, is_entrypoint_fn, is_trait_impl_item, method_chain_args};
 use pulldown_cmark::Event::{
-    Code, DisplayMath, End, FootnoteReference, HardBreak, Html, InlineHtml, InlineMath, Rule, SoftBreak, Start, TaskListMarker, Text,
+    Code, DisplayMath, End, FootnoteReference, HardBreak, Html, InlineHtml, InlineMath, Rule, SoftBreak, Start,
+    TaskListMarker, Text,
 };
 use pulldown_cmark::Tag::{BlockQuote, CodeBlock, FootnoteDefinition, Heading, Item, Link, Paragraph};
 use pulldown_cmark::{BrokenLink, CodeBlockKind, CowStr, Options, TagEnd};
@@ -747,7 +748,8 @@ fn check_doc<'a, Events: Iterator<Item = (pulldown_cmark::Event<'a>, Range<usize
             },
             Start(FootnoteDefinition(..)) => in_footnote_definition = true,
             End(TagEnd::FootnoteDefinition) => in_footnote_definition = false,
-            Start(_) | End(_) => (), // We don't care about other tags
+            Start(_) | End(_)  // We don't care about other tags
+            | TaskListMarker(_) | Code(_) | Rule | InlineMath(..) | DisplayMath(..) => (),
             SoftBreak | HardBreak => {
                 if !containers.is_empty()
                     && let Some((next_event, next_range)) = events.peek()
@@ -762,13 +764,24 @@ fn check_doc<'a, Events: Iterator<Item = (pulldown_cmark::Event<'a>, Range<usize
                         range.end..next_range.start,
                         Span::new(span.hi(), next_span.lo(), span.ctxt(), span.parent()),
                         &containers[..],
+                        span,
                     );
                 }
             },
-            TaskListMarker(_) | Code(_) | Rule | InlineMath(..) | DisplayMath(..) => (),
             FootnoteReference(text) | Text(text) => {
                 paragraph_range.end = range.end;
-                ticks_unbalanced |= text.contains('`') && !in_code;
+                let range_ = range.clone();
+                ticks_unbalanced |= text.contains('`')
+                    && !in_code
+                    && doc[range.clone()].bytes().enumerate().any(|(i, c)| {
+                        // scan the markdown source code bytes for backquotes that aren't preceded by backslashes
+                        // - use bytes, instead of chars, to avoid utf8 decoding overhead (special chars are ascii)
+                        // - relevant backquotes are within doc[range], but backslashes are not, because they're not
+                        //   actually part of the rendered text (pulldown-cmark doesn't emit any events for escapes)
+                        // - if `range_.start + i == 0`, then `range_.start + i - 1 == -1`, and since we're working in
+                        //   usize, that would underflow and maybe panic
+                        c == b'`' && (range_.start + i == 0 || doc.as_bytes().get(range_.start + i - 1) != Some(&b'\\'))
+                    });
                 if Some(&text) == in_link.as_ref() || ticks_unbalanced {
                     // Probably a link of the form `<http://example.com>`
                     // Which are represented as a link to "http://example.com" with
diff --git a/src/tools/clippy/clippy_lints/src/endian_bytes.rs b/src/tools/clippy/clippy_lints/src/endian_bytes.rs
index bb766e9633872..99328e3e643f8 100644
--- a/src/tools/clippy/clippy_lints/src/endian_bytes.rs
+++ b/src/tools/clippy/clippy_lints/src/endian_bytes.rs
@@ -33,7 +33,7 @@ declare_clippy_lint! {
     /// Checks for the usage of the `to_le_bytes` method and/or the function `from_le_bytes`.
     ///
     /// ### Why restrict this?
-    /// To ensure use of big endian or the target’s endianness rather than little endian.
+    /// To ensure use of big-endian or the target’s endianness rather than little-endian.
     ///
     /// ### Example
     /// ```rust,ignore
@@ -51,7 +51,7 @@ declare_clippy_lint! {
     /// Checks for the usage of the `to_be_bytes` method and/or the function `from_be_bytes`.
     ///
     /// ### Why restrict this?
-    /// To ensure use of little endian or the target’s endianness rather than big endian.
+    /// To ensure use of little-endian or the target’s endianness rather than big-endian.
     ///
     /// ### Example
     /// ```rust,ignore
diff --git a/src/tools/clippy/clippy_lints/src/eta_reduction.rs b/src/tools/clippy/clippy_lints/src/eta_reduction.rs
index 42ec2c00823c8..d2a34c7558321 100644
--- a/src/tools/clippy/clippy_lints/src/eta_reduction.rs
+++ b/src/tools/clippy/clippy_lints/src/eta_reduction.rs
@@ -15,7 +15,7 @@ use rustc_middle::ty::{
 use rustc_session::declare_lint_pass;
 use rustc_span::symbol::sym;
 use rustc_target::spec::abi::Abi;
-use rustc_trait_selection::traits::error_reporting::InferCtxtExt as _;
+use rustc_trait_selection::error_reporting::traits::InferCtxtExt as _;
 
 declare_clippy_lint! {
     /// ### What it does
diff --git a/src/tools/clippy/clippy_lints/src/functions/impl_trait_in_params.rs b/src/tools/clippy/clippy_lints/src/functions/impl_trait_in_params.rs
index 6fb38a0d6dd84..cf85c74e688d2 100644
--- a/src/tools/clippy/clippy_lints/src/functions/impl_trait_in_params.rs
+++ b/src/tools/clippy/clippy_lints/src/functions/impl_trait_in_params.rs
@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::is_in_test_function;
+use clippy_utils::is_in_test;
 
 use rustc_hir as hir;
 use rustc_hir::intravisit::FnKind;
@@ -41,7 +41,7 @@ fn report(cx: &LateContext<'_>, param: &GenericParam<'_>, generics: &Generics<'_
 pub(super) fn check_fn<'tcx>(cx: &LateContext<'_>, kind: &'tcx FnKind<'_>, body: &'tcx Body<'_>, hir_id: HirId) {
     if let FnKind::ItemFn(_, generics, _) = kind
         && cx.tcx.visibility(cx.tcx.hir().body_owner_def_id(body.id())).is_public()
-        && !is_in_test_function(cx.tcx, hir_id)
+        && !is_in_test(cx.tcx, hir_id)
     {
         for param in generics.params {
             if param.is_impl_trait() {
@@ -59,7 +59,7 @@ pub(super) fn check_impl_item(cx: &LateContext<'_>, impl_item: &ImplItem<'_>) {
         && of_trait.is_none()
         && let body = cx.tcx.hir().body(body_id)
         && cx.tcx.visibility(cx.tcx.hir().body_owner_def_id(body.id())).is_public()
-        && !is_in_test_function(cx.tcx, impl_item.hir_id())
+        && !is_in_test(cx.tcx, impl_item.hir_id())
     {
         for param in impl_item.generics.params {
             if param.is_impl_trait() {
@@ -75,7 +75,7 @@ pub(super) fn check_trait_item(cx: &LateContext<'_>, trait_item: &TraitItem<'_>,
         && let hir::Node::Item(item) = cx.tcx.parent_hir_node(trait_item.hir_id())
         // ^^ (Will always be a trait)
         && !item.vis_span.is_empty() // Is public
-        && !is_in_test_function(cx.tcx, trait_item.hir_id())
+        && !is_in_test(cx.tcx, trait_item.hir_id())
     {
         for param in trait_item.generics.params {
             if param.is_impl_trait() {
diff --git a/src/tools/clippy/clippy_lints/src/future_not_send.rs b/src/tools/clippy/clippy_lints/src/future_not_send.rs
index cb1d0de1edff9..1fd8faf3ea883 100644
--- a/src/tools/clippy/clippy_lints/src/future_not_send.rs
+++ b/src/tools/clippy/clippy_lints/src/future_not_send.rs
@@ -9,7 +9,7 @@ use rustc_middle::ty::{self, AliasTy, ClauseKind, PredicateKind};
 use rustc_session::declare_lint_pass;
 use rustc_span::def_id::LocalDefId;
 use rustc_span::{sym, Span};
-use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt;
+use rustc_trait_selection::error_reporting::traits::suggestions::TypeErrCtxtExt;
 use rustc_trait_selection::traits::{self, FulfillmentError, ObligationCtxt};
 
 declare_clippy_lint! {
diff --git a/src/tools/clippy/clippy_lints/src/incompatible_msrv.rs b/src/tools/clippy/clippy_lints/src/incompatible_msrv.rs
index 35b4481bfee7e..5c63d48adaf0b 100644
--- a/src/tools/clippy/clippy_lints/src/incompatible_msrv.rs
+++ b/src/tools/clippy/clippy_lints/src/incompatible_msrv.rs
@@ -1,6 +1,6 @@
 use clippy_config::msrvs::Msrv;
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::is_in_test_function;
+use clippy_utils::is_in_test;
 use rustc_attr::{StabilityLevel, StableSince};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::{Expr, ExprKind, HirId};
@@ -88,7 +88,7 @@ impl IncompatibleMsrv {
             return;
         }
         let version = self.get_def_id_version(cx.tcx, def_id);
-        if self.msrv.meets(version) || is_in_test_function(cx.tcx, node) {
+        if self.msrv.meets(version) || is_in_test(cx.tcx, node) {
             return;
         }
         if let ExpnKind::AstPass(_) | ExpnKind::Desugaring(_) = span.ctxt().outer_expn_data().kind {
diff --git a/src/tools/clippy/clippy_lints/src/inherent_to_string.rs b/src/tools/clippy/clippy_lints/src/inherent_to_string.rs
index 9aedf5ec7e85f..ec6174bc0301a 100644
--- a/src/tools/clippy/clippy_lints/src/inherent_to_string.rs
+++ b/src/tools/clippy/clippy_lints/src/inherent_to_string.rs
@@ -91,10 +91,6 @@ declare_lint_pass!(InherentToString => [INHERENT_TO_STRING, INHERENT_TO_STRING_S
 
 impl<'tcx> LateLintPass<'tcx> for InherentToString {
     fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx ImplItem<'_>) {
-        if impl_item.span.from_expansion() {
-            return;
-        }
-
         // Check if item is a method called `to_string` and has a parameter 'self'
         if let ImplItemKind::Fn(ref signature, _) = impl_item.kind
             // #11201
@@ -106,6 +102,7 @@ impl<'tcx> LateLintPass<'tcx> for InherentToString {
             && decl.implicit_self.has_implicit_self()
             && decl.inputs.len() == 1
             && impl_item.generics.params.iter().all(|p| matches!(p.kind, GenericParamKind::Lifetime { .. }))
+            && !impl_item.span.from_expansion()
             // Check if return type is String
             && is_type_lang_item(cx, return_ty(cx, impl_item.owner_id), LangItem::String)
             // Filters instances of to_string which are required by a trait
diff --git a/src/tools/clippy/clippy_lints/src/init_numbered_fields.rs b/src/tools/clippy/clippy_lints/src/init_numbered_fields.rs
index 1c8fd0a27f98f..7f183bb601eb4 100644
--- a/src/tools/clippy/clippy_lints/src/init_numbered_fields.rs
+++ b/src/tools/clippy/clippy_lints/src/init_numbered_fields.rs
@@ -1,13 +1,12 @@
-use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
 use rustc_errors::Applicability;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
+use rustc_span::SyntaxContext;
 use std::borrow::Cow;
-use std::cmp::Reverse;
-use std::collections::BinaryHeap;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -44,38 +43,56 @@ declare_lint_pass!(NumberedFields => [INIT_NUMBERED_FIELDS]);
 
 impl<'tcx> LateLintPass<'tcx> for NumberedFields {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
-        if let ExprKind::Struct(path, fields, None) = e.kind {
-            if !fields.is_empty()
-                && !e.span.from_expansion()
-                && fields
-                    .iter()
-                    .all(|f| f.ident.as_str().as_bytes().iter().all(u8::is_ascii_digit))
-                && !matches!(cx.qpath_res(path, e.hir_id), Res::Def(DefKind::TyAlias, ..))
-            {
-                let expr_spans = fields
-                    .iter()
-                    .map(|f| (Reverse(f.ident.as_str().parse::<usize>().unwrap()), f.expr.span))
-                    .collect::<BinaryHeap<_>>();
-                let mut appl = Applicability::MachineApplicable;
-                let snippet = format!(
-                    "{}({})",
-                    snippet_with_applicability(cx, path.span(), "..", &mut appl),
-                    expr_spans
-                        .into_iter_sorted()
-                        .map(|(_, span)| snippet_with_context(cx, span, path.span().ctxt(), "..", &mut appl).0)
-                        .intersperse(Cow::Borrowed(", "))
-                        .collect::<String>()
-                );
-                span_lint_and_sugg(
-                    cx,
-                    INIT_NUMBERED_FIELDS,
-                    e.span,
-                    "used a field initializer for a tuple struct",
-                    "try",
-                    snippet,
-                    appl,
-                );
-            }
+        if let ExprKind::Struct(path, fields @ [field, ..], None) = e.kind
+            // If the first character of any field is a digit it has to be a tuple.
+            && field.ident.as_str().as_bytes().first().is_some_and(u8::is_ascii_digit)
+            // Type aliases can't be used as functions.
+            && !matches!(
+                cx.qpath_res(path, e.hir_id),
+                Res::Def(DefKind::TyAlias | DefKind::AssocTy, _)
+            )
+            // This is the only syntax macros can use that works for all struct types.
+            && !e.span.from_expansion()
+            && let mut has_side_effects = false
+            && let Ok(mut expr_spans) = fields
+                .iter()
+                .map(|f| {
+                    has_side_effects |= f.expr.can_have_side_effects();
+                    f.ident.as_str().parse::<usize>().map(|x| (x, f.expr.span))
+                })
+                .collect::<Result<Vec<_>, _>>()
+            // We can only reorder the expressions if there are no side effects.
+            && (!has_side_effects || expr_spans.is_sorted_by_key(|&(idx, _)| idx))
+        {
+            span_lint_and_then(
+                cx,
+                INIT_NUMBERED_FIELDS,
+                e.span,
+                "used a field initializer for a tuple struct",
+                |diag| {
+                    if !has_side_effects {
+                        // We already checked the order if there are side effects.
+                        expr_spans.sort_by_key(|&(idx, _)| idx);
+                    }
+                    let mut app = Applicability::MachineApplicable;
+                    diag.span_suggestion(
+                        e.span,
+                        "use tuple initialization",
+                        format!(
+                            "{}({})",
+                            snippet_with_applicability(cx, path.span(), "..", &mut app),
+                            expr_spans
+                                .into_iter()
+                                .map(
+                                    |(_, span)| snippet_with_context(cx, span, SyntaxContext::root(), "..", &mut app).0
+                                )
+                                .intersperse(Cow::Borrowed(", "))
+                                .collect::<String>()
+                        ),
+                        app,
+                    );
+                },
+            );
         }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/inline_fn_without_body.rs b/src/tools/clippy/clippy_lints/src/inline_fn_without_body.rs
index 860258fd030e0..5657c58bb0a47 100644
--- a/src/tools/clippy/clippy_lints/src/inline_fn_without_body.rs
+++ b/src/tools/clippy/clippy_lints/src/inline_fn_without_body.rs
@@ -2,12 +2,11 @@
 
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::sugg::DiagExt;
-use rustc_ast::ast::Attribute;
 use rustc_errors::Applicability;
 use rustc_hir::{TraitFn, TraitItem, TraitItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
-use rustc_span::{sym, Symbol};
+use rustc_span::sym;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -34,27 +33,23 @@ declare_lint_pass!(InlineFnWithoutBody => [INLINE_FN_WITHOUT_BODY]);
 
 impl<'tcx> LateLintPass<'tcx> for InlineFnWithoutBody {
     fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
-        if let TraitItemKind::Fn(_, TraitFn::Required(_)) = item.kind {
-            let attrs = cx.tcx.hir().attrs(item.hir_id());
-            check_attrs(cx, item.ident.name, attrs);
+        if let TraitItemKind::Fn(_, TraitFn::Required(_)) = item.kind
+            && let Some(attr) = cx
+                .tcx
+                .hir()
+                .attrs(item.hir_id())
+                .iter()
+                .find(|a| a.has_name(sym::inline))
+        {
+            span_lint_and_then(
+                cx,
+                INLINE_FN_WITHOUT_BODY,
+                attr.span,
+                format!("use of `#[inline]` on trait method `{}` which has no body", item.ident),
+                |diag| {
+                    diag.suggest_remove_item(cx, attr.span, "remove", Applicability::MachineApplicable);
+                },
+            );
         }
     }
 }
-
-fn check_attrs(cx: &LateContext<'_>, name: Symbol, attrs: &[Attribute]) {
-    for attr in attrs {
-        if !attr.has_name(sym::inline) {
-            continue;
-        }
-
-        span_lint_and_then(
-            cx,
-            INLINE_FN_WITHOUT_BODY,
-            attr.span,
-            format!("use of `#[inline]` on trait method `{name}` which has no body"),
-            |diag| {
-                diag.suggest_remove_item(cx, attr.span, "remove", Applicability::MachineApplicable);
-            },
-        );
-    }
-}
diff --git a/src/tools/clippy/clippy_lints/src/instant_subtraction.rs b/src/tools/clippy/clippy_lints/src/instant_subtraction.rs
index 10b00f632bb00..5fe152d1e3011 100644
--- a/src/tools/clippy/clippy_lints/src/instant_subtraction.rs
+++ b/src/tools/clippy/clippy_lints/src/instant_subtraction.rs
@@ -85,16 +85,19 @@ impl LateLintPass<'_> for InstantSubtraction {
             lhs,
             rhs,
         ) = expr.kind
+            && let typeck = cx.typeck_results()
+            && ty::is_type_diagnostic_item(cx, typeck.expr_ty(lhs), sym::Instant)
         {
+            let rhs_ty = typeck.expr_ty(rhs);
+
             if is_instant_now_call(cx, lhs)
-                && is_an_instant(cx, rhs)
+                && ty::is_type_diagnostic_item(cx, rhs_ty, sym::Instant)
                 && let Some(sugg) = Sugg::hir_opt(cx, rhs)
             {
                 print_manual_instant_elapsed_sugg(cx, expr, sugg);
-            } else if !expr.span.from_expansion()
+            } else if ty::is_type_diagnostic_item(cx, rhs_ty, sym::Duration)
+                && !expr.span.from_expansion()
                 && self.msrv.meets(msrvs::TRY_FROM)
-                && is_an_instant(cx, lhs)
-                && is_a_duration(cx, rhs)
             {
                 print_unchecked_duration_subtraction_sugg(cx, lhs, rhs, expr);
             }
@@ -115,16 +118,6 @@ fn is_instant_now_call(cx: &LateContext<'_>, expr_block: &'_ Expr<'_>) -> bool {
     }
 }
 
-fn is_an_instant(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
-    let expr_ty = cx.typeck_results().expr_ty(expr);
-    ty::is_type_diagnostic_item(cx, expr_ty, sym::Instant)
-}
-
-fn is_a_duration(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
-    let expr_ty = cx.typeck_results().expr_ty(expr);
-    ty::is_type_diagnostic_item(cx, expr_ty, sym::Duration)
-}
-
 fn print_manual_instant_elapsed_sugg(cx: &LateContext<'_>, expr: &Expr<'_>, sugg: Sugg<'_>) {
     span_lint_and_sugg(
         cx,
diff --git a/src/tools/clippy/clippy_lints/src/items_after_statements.rs b/src/tools/clippy/clippy_lints/src/items_after_statements.rs
index 39223c20470b5..a88d8e24fda8d 100644
--- a/src/tools/clippy/clippy_lints/src/items_after_statements.rs
+++ b/src/tools/clippy/clippy_lints/src/items_after_statements.rs
@@ -54,36 +54,35 @@ declare_lint_pass!(ItemsAfterStatements => [ITEMS_AFTER_STATEMENTS]);
 
 impl LateLintPass<'_> for ItemsAfterStatements {
     fn check_block(&mut self, cx: &LateContext<'_>, block: &Block<'_>) {
-        if in_external_macro(cx.sess(), block.span) {
-            return;
-        }
-
-        // skip initial items
-        let stmts = block
-            .stmts
-            .iter()
-            .skip_while(|stmt| matches!(stmt.kind, StmtKind::Item(..)));
-
-        // lint on all further items
-        for stmt in stmts {
-            if let StmtKind::Item(item_id) = stmt.kind {
-                let item = cx.tcx.hir().item(item_id);
-                if in_external_macro(cx.sess(), item.span) || !item.span.eq_ctxt(block.span) {
-                    return;
-                }
-                if let ItemKind::Macro(..) = item.kind {
-                    // do not lint `macro_rules`, but continue processing further statements
-                    continue;
-                }
-                span_lint_hir(
-                    cx,
-                    ITEMS_AFTER_STATEMENTS,
-                    item.hir_id(),
-                    item.span,
-                    "adding items after statements is confusing, since items exist from the \
-                     start of the scope",
-                );
-            }
+        if block.stmts.len() > 1 {
+            let ctxt = block.span.ctxt();
+            let mut in_external = None;
+            block
+                .stmts
+                .iter()
+                .skip_while(|stmt| matches!(stmt.kind, StmtKind::Item(..)))
+                .filter_map(|stmt| match stmt.kind {
+                    StmtKind::Item(id) => Some(cx.tcx.hir().item(id)),
+                    _ => None,
+                })
+                // Ignore macros since they can only see previously defined locals.
+                .filter(|item| !matches!(item.kind, ItemKind::Macro(..)))
+                // Stop linting if macros define items.
+                .take_while(|item| item.span.ctxt() == ctxt)
+                // Don't use `next` due to the complex filter chain.
+                .for_each(|item| {
+                    // Only do the macro check once, but delay it until it's needed.
+                    if !*in_external.get_or_insert_with(|| in_external_macro(cx.sess(), block.span)) {
+                        span_lint_hir(
+                            cx,
+                            ITEMS_AFTER_STATEMENTS,
+                            item.hir_id(),
+                            item.span,
+                            "adding items after statements is confusing, since items exist from the \
+                                start of the scope",
+                        );
+                    }
+                });
         }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/iter_not_returning_iterator.rs b/src/tools/clippy/clippy_lints/src/iter_not_returning_iterator.rs
index 1b5f1b499475f..ba0cd5d6eb359 100644
--- a/src/tools/clippy/clippy_lints/src/iter_not_returning_iterator.rs
+++ b/src/tools/clippy/clippy_lints/src/iter_not_returning_iterator.rs
@@ -4,7 +4,7 @@ use rustc_hir::def_id::LocalDefId;
 use rustc_hir::{FnSig, ImplItem, ImplItemKind, Item, ItemKind, Node, TraitItem, TraitItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
-use rustc_span::symbol::sym;
+use rustc_span::{sym, Symbol};
 
 declare_clippy_lint! {
     /// ### What it does
@@ -43,30 +43,27 @@ declare_lint_pass!(IterNotReturningIterator => [ITER_NOT_RETURNING_ITERATOR]);
 
 impl<'tcx> LateLintPass<'tcx> for IterNotReturningIterator {
     fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
-        let name = item.ident.name.as_str();
-        if matches!(name, "iter" | "iter_mut") {
-            if let TraitItemKind::Fn(fn_sig, _) = &item.kind {
-                check_sig(cx, name, fn_sig, item.owner_id.def_id);
-            }
+        if let TraitItemKind::Fn(fn_sig, _) = &item.kind
+            && matches!(item.ident.name, sym::iter | sym::iter_mut)
+        {
+            check_sig(cx, item.ident.name, fn_sig, item.owner_id.def_id);
         }
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'tcx>) {
-        let name = item.ident.name.as_str();
-        if matches!(name, "iter" | "iter_mut")
+        if let ImplItemKind::Fn(fn_sig, _) = &item.kind
+            && matches!(item.ident.name, sym::iter | sym::iter_mut)
             && !matches!(
                 cx.tcx.parent_hir_node(item.hir_id()),
                 Node::Item(Item { kind: ItemKind::Impl(i), .. }) if i.of_trait.is_some()
             )
         {
-            if let ImplItemKind::Fn(fn_sig, _) = &item.kind {
-                check_sig(cx, name, fn_sig, item.owner_id.def_id);
-            }
+            check_sig(cx, item.ident.name, fn_sig, item.owner_id.def_id);
         }
     }
 }
 
-fn check_sig(cx: &LateContext<'_>, name: &str, sig: &FnSig<'_>, fn_id: LocalDefId) {
+fn check_sig(cx: &LateContext<'_>, name: Symbol, sig: &FnSig<'_>, fn_id: LocalDefId) {
     if sig.decl.implicit_self.has_implicit_self() {
         let ret_ty = cx
             .tcx
diff --git a/src/tools/clippy/clippy_lints/src/iter_without_into_iter.rs b/src/tools/clippy/clippy_lints/src/iter_without_into_iter.rs
index 6b03f2597b083..1e6404190d3cf 100644
--- a/src/tools/clippy/clippy_lints/src/iter_without_into_iter.rs
+++ b/src/tools/clippy/clippy_lints/src/iter_without_into_iter.rs
@@ -125,13 +125,13 @@ fn is_ty_exported(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
 
 impl LateLintPass<'_> for IterWithoutIntoIter {
     fn check_item(&mut self, cx: &LateContext<'_>, item: &rustc_hir::Item<'_>) {
-        if !in_external_macro(cx.sess(), item.span)
-            && let ItemKind::Impl(imp) = item.kind
+        if let ItemKind::Impl(imp) = item.kind
             && let TyKind::Ref(_, self_ty_without_ref) = &imp.self_ty.kind
             && let Some(trait_ref) = imp.of_trait
             && trait_ref
                 .trait_def_id()
                 .is_some_and(|did| cx.tcx.is_diagnostic_item(sym::IntoIterator, did))
+            && !in_external_macro(cx.sess(), item.span)
             && let &ty::Ref(_, ty, mtbl) = cx.tcx.type_of(item.owner_id).instantiate_identity().kind()
             && let expected_method_name = match mtbl {
                 Mutability::Mut => sym::iter_mut,
diff --git a/src/tools/clippy/clippy_lints/src/large_const_arrays.rs b/src/tools/clippy/clippy_lints/src/large_const_arrays.rs
index 7f8197c0cc01a..b18ab625e6091 100644
--- a/src/tools/clippy/clippy_lints/src/large_const_arrays.rs
+++ b/src/tools/clippy/clippy_lints/src/large_const_arrays.rs
@@ -46,12 +46,12 @@ impl_lint_pass!(LargeConstArrays => [LARGE_CONST_ARRAYS]);
 
 impl<'tcx> LateLintPass<'tcx> for LargeConstArrays {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
-        if !item.span.from_expansion()
-            && let ItemKind::Const(_, generics, _) = &item.kind
+        if let ItemKind::Const(_, generics, _) = &item.kind
             // Since static items may not have generics, skip generic const items.
             // FIXME(generic_const_items): I don't think checking `generics.hwcp` suffices as it
             // doesn't account for empty where-clauses that only consist of keyword `where` IINM.
             && generics.params.is_empty() && !generics.has_where_clause_predicates
+            && !item.span.from_expansion()
             && let ty = cx.tcx.type_of(item.owner_id).instantiate_identity()
             && let ty::Array(element_type, cst) = ty.kind()
             && let ConstKind::Value(_, ty::ValTree::Leaf(element_count)) = cst.kind()
diff --git a/src/tools/clippy/clippy_lints/src/large_enum_variant.rs b/src/tools/clippy/clippy_lints/src/large_enum_variant.rs
index 0bf7389ef9cc8..85daadcc53734 100644
--- a/src/tools/clippy/clippy_lints/src/large_enum_variant.rs
+++ b/src/tools/clippy/clippy_lints/src/large_enum_variant.rs
@@ -77,17 +77,12 @@ impl_lint_pass!(LargeEnumVariant => [LARGE_ENUM_VARIANT]);
 
 impl<'tcx> LateLintPass<'tcx> for LargeEnumVariant {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &Item<'tcx>) {
-        if in_external_macro(cx.tcx.sess, item.span) {
-            return;
-        }
-        if let ItemKind::Enum(ref def, _) = item.kind {
-            let ty = cx.tcx.type_of(item.owner_id).instantiate_identity();
-            let ty::Adt(adt, subst) = ty.kind() else {
-                panic!("already checked whether this is an enum")
-            };
-            if adt.variants().len() <= 1 {
-                return;
-            }
+        if let ItemKind::Enum(ref def, _) = item.kind
+            && let ty = cx.tcx.type_of(item.owner_id).instantiate_identity()
+            && let ty::Adt(adt, subst) = ty.kind()
+            && adt.variants().len() > 1
+            && !in_external_macro(cx.tcx.sess, item.span)
+        {
             let variants_size = AdtVariantInfo::new(cx, *adt, subst);
 
             let mut difference = variants_size[0].size - variants_size[1].size;
diff --git a/src/tools/clippy/clippy_lints/src/large_futures.rs b/src/tools/clippy/clippy_lints/src/large_futures.rs
index 07488a512a37e..602227e42490a 100644
--- a/src/tools/clippy/clippy_lints/src/large_futures.rs
+++ b/src/tools/clippy/clippy_lints/src/large_futures.rs
@@ -54,29 +54,26 @@ impl_lint_pass!(LargeFuture => [LARGE_FUTURES]);
 
 impl<'tcx> LateLintPass<'tcx> for LargeFuture {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
-        if matches!(expr.span.ctxt().outer_expn_data().kind, rustc_span::ExpnKind::Macro(..)) {
-            return;
-        }
-        if let ExprKind::Match(expr, _, MatchSource::AwaitDesugar) = expr.kind {
-            if let ExprKind::Call(func, [expr, ..]) = expr.kind
-                && let ExprKind::Path(QPath::LangItem(LangItem::IntoFutureIntoFuture, ..)) = func.kind
-                && let ty = cx.typeck_results().expr_ty(expr)
-                && let Some(future_trait_def_id) = cx.tcx.lang_items().future_trait()
-                && implements_trait(cx, ty, future_trait_def_id, &[])
-                && let Ok(layout) = cx.tcx.layout_of(cx.param_env.and(ty))
-                && let size = layout.layout.size()
-                && size >= Size::from_bytes(self.future_size_threshold)
-            {
-                span_lint_and_sugg(
-                    cx,
-                    LARGE_FUTURES,
-                    expr.span,
-                    format!("large future with a size of {} bytes", size.bytes()),
-                    "consider `Box::pin` on it",
-                    format!("Box::pin({})", snippet(cx, expr.span, "..")),
-                    Applicability::Unspecified,
-                );
-            }
+        if let ExprKind::Match(scrutinee, _, MatchSource::AwaitDesugar) = expr.kind
+            && let ExprKind::Call(func, [arg, ..]) = scrutinee.kind
+            && let ExprKind::Path(QPath::LangItem(LangItem::IntoFutureIntoFuture, ..)) = func.kind
+            && !expr.span.from_expansion()
+            && let ty = cx.typeck_results().expr_ty(arg)
+            && let Some(future_trait_def_id) = cx.tcx.lang_items().future_trait()
+            && implements_trait(cx, ty, future_trait_def_id, &[])
+            && let Ok(layout) = cx.tcx.layout_of(cx.param_env.and(ty))
+            && let size = layout.layout.size()
+            && size >= Size::from_bytes(self.future_size_threshold)
+        {
+            span_lint_and_sugg(
+                cx,
+                LARGE_FUTURES,
+                arg.span,
+                format!("large future with a size of {} bytes", size.bytes()),
+                "consider `Box::pin` on it",
+                format!("Box::pin({})", snippet(cx, arg.span, "..")),
+                Applicability::Unspecified,
+            );
         }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/large_include_file.rs b/src/tools/clippy/clippy_lints/src/large_include_file.rs
index 07efee159aab4..2688283a6ce8d 100644
--- a/src/tools/clippy/clippy_lints/src/large_include_file.rs
+++ b/src/tools/clippy/clippy_lints/src/large_include_file.rs
@@ -1,5 +1,4 @@
 use clippy_utils::diagnostics::span_lint_and_note;
-use clippy_utils::is_lint_allowed;
 use clippy_utils::macros::root_macro_call_first_node;
 use rustc_ast::LitKind;
 use rustc_hir::{Expr, ExprKind};
@@ -52,24 +51,19 @@ impl_lint_pass!(LargeIncludeFile => [LARGE_INCLUDE_FILE]);
 
 impl LateLintPass<'_> for LargeIncludeFile {
     fn check_expr(&mut self, cx: &LateContext<'_>, expr: &'_ Expr<'_>) {
-        if let Some(macro_call) = root_macro_call_first_node(cx, expr)
-            && !is_lint_allowed(cx, LARGE_INCLUDE_FILE, expr.hir_id)
-            && (cx.tcx.is_diagnostic_item(sym::include_bytes_macro, macro_call.def_id)
-                || cx.tcx.is_diagnostic_item(sym::include_str_macro, macro_call.def_id))
-            && let ExprKind::Lit(lit) = &expr.kind
-        {
-            let len = match &lit.node {
+        if let ExprKind::Lit(lit) = &expr.kind
+            && let len = match &lit.node {
                 // include_bytes
                 LitKind::ByteStr(bstr, _) => bstr.len(),
                 // include_str
                 LitKind::Str(sym, _) => sym.as_str().len(),
                 _ => return,
-            };
-
-            if len as u64 <= self.max_file_size {
-                return;
             }
-
+            && len as u64 > self.max_file_size
+            && let Some(macro_call) = root_macro_call_first_node(cx, expr)
+            && (cx.tcx.is_diagnostic_item(sym::include_bytes_macro, macro_call.def_id)
+                || cx.tcx.is_diagnostic_item(sym::include_str_macro, macro_call.def_id))
+        {
             span_lint_and_note(
                 cx,
                 LARGE_INCLUDE_FILE,
diff --git a/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs b/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs
index eadfeb6e34181..a08b40bef3722 100644
--- a/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs
+++ b/src/tools/clippy/clippy_lints/src/legacy_numeric_constants.rs
@@ -48,15 +48,11 @@ impl_lint_pass!(LegacyNumericConstants => [LEGACY_NUMERIC_CONSTANTS]);
 
 impl<'tcx> LateLintPass<'tcx> for LegacyNumericConstants {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
-        let Self { msrv } = self;
-
-        if !msrv.meets(NUMERIC_ASSOCIATED_CONSTANTS) || in_external_macro(cx.sess(), item.span) {
-            return;
-        }
-
         // Integer modules are "TBD" deprecated, and the contents are too,
         // so lint on the `use` statement directly.
         if let ItemKind::Use(path, kind @ (UseKind::Single | UseKind::Glob)) = item.kind
+            && self.msrv.meets(NUMERIC_ASSOCIATED_CONSTANTS)
+            && !in_external_macro(cx.sess(), item.span)
             && let Some(def_id) = path.res[0].opt_def_id()
         {
             let module = if is_integer_module(cx, def_id) {
@@ -103,12 +99,7 @@ impl<'tcx> LateLintPass<'tcx> for LegacyNumericConstants {
     }
 
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tcx>) {
-        let Self { msrv } = self;
-
-        if !msrv.meets(NUMERIC_ASSOCIATED_CONSTANTS) || in_external_macro(cx.sess(), expr.span) {
-            return;
-        }
-        let ExprKind::Path(qpath) = expr.kind else {
+        let ExprKind::Path(qpath) = &expr.kind else {
             return;
         };
 
@@ -129,10 +120,10 @@ impl<'tcx> LateLintPass<'tcx> for LegacyNumericConstants {
             )
         // `<integer>::xxx_value` check
         } else if let QPath::TypeRelative(_, last_segment) = qpath
-            && let Some(def_id) = cx.qpath_res(&qpath, expr.hir_id).opt_def_id()
-            && is_integer_method(cx, def_id)
+            && let Some(def_id) = cx.qpath_res(qpath, expr.hir_id).opt_def_id()
             && let Some(par_expr) = get_parent_expr(cx, expr)
-            && let ExprKind::Call(_, _) = par_expr.kind
+            && let ExprKind::Call(_, []) = par_expr.kind
+            && is_integer_method(cx, def_id)
         {
             let name = last_segment.ident.name.as_str();
 
@@ -145,19 +136,20 @@ impl<'tcx> LateLintPass<'tcx> for LegacyNumericConstants {
             return;
         };
 
-        if is_from_proc_macro(cx, expr) {
-            return;
+        if self.msrv.meets(NUMERIC_ASSOCIATED_CONSTANTS)
+            && !in_external_macro(cx.sess(), expr.span)
+            && !is_from_proc_macro(cx, expr)
+        {
+            span_lint_hir_and_then(cx, LEGACY_NUMERIC_CONSTANTS, expr.hir_id, span, msg, |diag| {
+                diag.span_suggestion_with_style(
+                    span,
+                    "use the associated constant instead",
+                    sugg,
+                    Applicability::MaybeIncorrect,
+                    SuggestionStyle::ShowAlways,
+                );
+            });
         }
-
-        span_lint_hir_and_then(cx, LEGACY_NUMERIC_CONSTANTS, expr.hir_id, span, msg, |diag| {
-            diag.span_suggestion_with_style(
-                span,
-                "use the associated constant instead",
-                sugg,
-                Applicability::MaybeIncorrect,
-                SuggestionStyle::ShowAlways,
-            );
-        });
     }
 
     extract_msrv_attr!(LateContext);
diff --git a/src/tools/clippy/clippy_lints/src/len_zero.rs b/src/tools/clippy/clippy_lints/src/len_zero.rs
index 57e0a7aa2c7e9..4c737371bd238 100644
--- a/src/tools/clippy/clippy_lints/src/len_zero.rs
+++ b/src/tools/clippy/clippy_lints/src/len_zero.rs
@@ -121,11 +121,9 @@ declare_lint_pass!(LenZero => [LEN_ZERO, LEN_WITHOUT_IS_EMPTY, COMPARISON_TO_EMP
 
 impl<'tcx> LateLintPass<'tcx> for LenZero {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
-        if item.span.from_expansion() {
-            return;
-        }
-
-        if let ItemKind::Trait(_, _, _, _, trait_items) = item.kind {
+        if let ItemKind::Trait(_, _, _, _, trait_items) = item.kind
+            && !item.span.from_expansion()
+        {
             check_trait_items(cx, item, trait_items);
         }
     }
@@ -162,17 +160,14 @@ impl<'tcx> LateLintPass<'tcx> for LenZero {
     }
 
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if expr.span.from_expansion() {
-            return;
-        }
-
         if let ExprKind::Let(lt) = expr.kind
-            && has_is_empty(cx, lt.init)
             && match lt.pat.kind {
                 PatKind::Slice([], None, []) => true,
                 PatKind::Lit(lit) if is_empty_string(lit) => true,
                 _ => false,
             }
+            && !expr.span.from_expansion()
+            && has_is_empty(cx, lt.init)
         {
             let mut applicability = Applicability::MachineApplicable;
 
@@ -190,7 +185,9 @@ impl<'tcx> LateLintPass<'tcx> for LenZero {
             );
         }
 
-        if let ExprKind::Binary(Spanned { node: cmp, .. }, left, right) = expr.kind {
+        if let ExprKind::Binary(Spanned { node: cmp, .. }, left, right) = expr.kind
+            && !expr.span.from_expansion()
+        {
             // expr.span might contains parenthesis, see issue #10529
             let actual_span = span_without_enclosing_paren(cx, expr.span);
             match cmp {
diff --git a/src/tools/clippy/clippy_lints/src/let_if_seq.rs b/src/tools/clippy/clippy_lints/src/let_if_seq.rs
index a65cb3f4dfb44..0e488cee6b74e 100644
--- a/src/tools/clippy/clippy_lints/src/let_if_seq.rs
+++ b/src/tools/clippy/clippy_lints/src/let_if_seq.rs
@@ -58,12 +58,10 @@ declare_lint_pass!(LetIfSeq => [USELESS_LET_IF_SEQ]);
 
 impl<'tcx> LateLintPass<'tcx> for LetIfSeq {
     fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx hir::Block<'_>) {
-        let mut it = block.stmts.iter().peekable();
-        while let Some(stmt) = it.next() {
-            if let Some(expr) = it.peek()
-                && let hir::StmtKind::Let(local) = stmt.kind
+        for [stmt, next] in block.stmts.array_windows::<2>() {
+            if let hir::StmtKind::Let(local) = stmt.kind
                 && let hir::PatKind::Binding(mode, canonical_id, ident, None) = local.pat.kind
-                && let hir::StmtKind::Expr(if_) = expr.kind
+                && let hir::StmtKind::Expr(if_) = next.kind
                 && let hir::ExprKind::If(
                     hir::Expr {
                         kind: hir::ExprKind::DropTemps(cond),
diff --git a/src/tools/clippy/clippy_lints/src/let_underscore.rs b/src/tools/clippy/clippy_lints/src/let_underscore.rs
index 9fd4f509aa473..8fa63f3e8fde0 100644
--- a/src/tools/clippy/clippy_lints/src/let_underscore.rs
+++ b/src/tools/clippy/clippy_lints/src/let_underscore.rs
@@ -139,9 +139,9 @@ const SYNC_GUARD_PATHS: [&[&str]; 3] = [
 impl<'tcx> LateLintPass<'tcx> for LetUnderscore {
     fn check_local(&mut self, cx: &LateContext<'tcx>, local: &LetStmt<'tcx>) {
         if matches!(local.source, LocalSource::Normal)
-            && !in_external_macro(cx.tcx.sess, local.span)
             && let PatKind::Wild = local.pat.kind
             && let Some(init) = local.init
+            && !in_external_macro(cx.tcx.sess, local.span)
         {
             let init_ty = cx.typeck_results().expr_ty(init);
             let contains_sync_guard = init_ty.walk().any(|inner| match inner.unpack() {
diff --git a/src/tools/clippy/clippy_lints/src/let_with_type_underscore.rs b/src/tools/clippy/clippy_lints/src/let_with_type_underscore.rs
index 593b29154b426..5a11702d7ce54 100644
--- a/src/tools/clippy/clippy_lints/src/let_with_type_underscore.rs
+++ b/src/tools/clippy/clippy_lints/src/let_with_type_underscore.rs
@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint_and_help;
-use clippy_utils::source::snippet;
+use clippy_utils::is_from_proc_macro;
 use rustc_hir::{LetStmt, TyKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::lint::in_external_macro;
@@ -25,19 +25,14 @@ declare_clippy_lint! {
 }
 declare_lint_pass!(UnderscoreTyped => [LET_WITH_TYPE_UNDERSCORE]);
 
-impl LateLintPass<'_> for UnderscoreTyped {
-    fn check_local(&mut self, cx: &LateContext<'_>, local: &LetStmt<'_>) {
-        if !in_external_macro(cx.tcx.sess, local.span)
-            && let Some(ty) = local.ty // Ensure that it has a type defined
+impl<'tcx> LateLintPass<'tcx> for UnderscoreTyped {
+    fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx LetStmt<'_>) {
+        if let Some(ty) = local.ty // Ensure that it has a type defined
             && let TyKind::Infer = &ty.kind // that type is '_'
             && local.span.eq_ctxt(ty.span)
+            && !in_external_macro(cx.tcx.sess, local.span)
+            && !is_from_proc_macro(cx, ty)
         {
-            // NOTE: Using `is_from_proc_macro` on `init` will require that it's initialized,
-            // this doesn't. Alternatively, `WithSearchPat` can be implemented for `Ty`
-            if snippet(cx, ty.span, "_").trim() != "_" {
-                return;
-            }
-
             span_lint_and_help(
                 cx,
                 LET_WITH_TYPE_UNDERSCORE,
diff --git a/src/tools/clippy/clippy_lints/src/lib.rs b/src/tools/clippy/clippy_lints/src/lib.rs
index 32fad0f02ceab..c2dc26d6605bb 100644
--- a/src/tools/clippy/clippy_lints/src/lib.rs
+++ b/src/tools/clippy/clippy_lints/src/lib.rs
@@ -4,7 +4,9 @@
 #![feature(f128)]
 #![feature(f16)]
 #![feature(if_let_guard)]
+#![feature(is_sorted)]
 #![feature(iter_intersperse)]
+#![feature(iter_partition_in_place)]
 #![feature(let_chains)]
 #![cfg_attr(bootstrap, feature(lint_reasons))]
 #![feature(never_type)]
@@ -90,8 +92,10 @@ mod bool_to_int_with_if;
 mod booleans;
 mod borrow_deref_ref;
 mod box_default;
+mod byte_char_slices;
 mod cargo;
 mod casts;
+mod cfg_not_test;
 mod checked_conversions;
 mod cognitive_complexity;
 mod collapsible_if;
@@ -212,6 +216,7 @@ mod manual_non_exhaustive;
 mod manual_range_patterns;
 mod manual_rem_euclid;
 mod manual_retain;
+mod manual_rotate;
 mod manual_slice_size_calculation;
 mod manual_string_new;
 mod manual_strip;
@@ -229,6 +234,7 @@ mod mismatching_type_param_order;
 mod missing_assert_message;
 mod missing_asserts_for_indexing;
 mod missing_const_for_fn;
+mod missing_const_for_thread_local;
 mod missing_doc;
 mod missing_enforced_import_rename;
 mod missing_fields_in_debug;
@@ -275,9 +281,9 @@ mod only_used_in_recursion;
 mod operators;
 mod option_env_unwrap;
 mod option_if_let_else;
-mod overflow_check_conditional;
 mod panic_in_result_fn;
 mod panic_unimplemented;
+mod panicking_overflow_checks;
 mod partial_pub_fields;
 mod partialeq_ne_impl;
 mod partialeq_to_none;
@@ -318,6 +324,7 @@ mod self_named_constructors;
 mod semicolon_block;
 mod semicolon_if_nothing_returned;
 mod serde_api;
+mod set_contains_or_insert;
 mod shadow;
 mod significant_drop_tightening;
 mod single_call_fn;
@@ -339,7 +346,6 @@ mod swap_ptr_to_ref;
 mod tabs_in_doc_comments;
 mod temporary_assignment;
 mod tests_outside_test_module;
-mod thread_local_initializer_can_be_made_const;
 mod to_digit_is_some;
 mod to_string_trait_impl;
 mod trailing_empty_array;
@@ -639,9 +645,6 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
         });
         store.register_early_pass(|| Box::new(utils::internal_lints::produce_ice::ProduceIce));
         store.register_late_pass(|_| Box::new(utils::internal_lints::collapsible_calls::CollapsibleCalls));
-        store.register_late_pass(|_| {
-            Box::new(utils::internal_lints::compiler_lint_functions::CompilerLintFunctions::new())
-        });
         store.register_late_pass(|_| Box::new(utils::internal_lints::invalid_paths::InvalidPaths));
         store.register_late_pass(|_| {
             Box::<utils::internal_lints::interning_defined_symbol::InterningDefinedSymbol>::default()
@@ -788,7 +791,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
     let format_args = format_args_storage.clone();
     store.register_late_pass(move |_| Box::new(format::UselessFormat::new(format_args.clone())));
     store.register_late_pass(|_| Box::new(swap::Swap));
-    store.register_late_pass(|_| Box::new(overflow_check_conditional::OverflowCheckConditional));
+    store.register_late_pass(|_| Box::new(panicking_overflow_checks::PanickingOverflowChecks));
     store.register_late_pass(|_| Box::<new_without_default::NewWithoutDefault>::default());
     store.register_late_pass(move |_| Box::new(disallowed_names::DisallowedNames::new(disallowed_names)));
     store.register_late_pass(move |_| {
@@ -1024,6 +1027,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
     store.register_late_pass(|_| Box::new(default_instead_of_iter_empty::DefaultIterEmpty));
     store.register_late_pass(move |_| Box::new(manual_rem_euclid::ManualRemEuclid::new(msrv())));
     store.register_late_pass(move |_| Box::new(manual_retain::ManualRetain::new(msrv())));
+    store.register_late_pass(move |_| Box::new(manual_rotate::ManualRotate));
     store.register_late_pass(move |_| {
         Box::new(operators::Operators::new(
             verbose_bit_mask_threshold,
@@ -1153,9 +1157,8 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
             behavior: pub_underscore_fields_behavior,
         })
     });
-    store.register_late_pass(move |_| {
-        Box::new(thread_local_initializer_can_be_made_const::ThreadLocalInitializerCanBeMadeConst::new(msrv()))
-    });
+    store
+        .register_late_pass(move |_| Box::new(missing_const_for_thread_local::MissingConstForThreadLocal::new(msrv())));
     store.register_late_pass(move |_| Box::new(incompatible_msrv::IncompatibleMsrv::new(msrv())));
     store.register_late_pass(|_| Box::new(to_string_trait_impl::ToStringTraitImpl));
     store.register_early_pass(|| Box::new(multiple_bound_locations::MultipleBoundLocations));
@@ -1171,6 +1174,9 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
     });
     store.register_late_pass(move |_| Box::new(string_patterns::StringPatterns::new(msrv())));
     store.register_early_pass(|| Box::new(field_scoped_visibility_modifiers::FieldScopedVisibilityModifiers));
+    store.register_late_pass(|_| Box::new(set_contains_or_insert::HashsetInsertAfterContains));
+    store.register_early_pass(|| Box::new(byte_char_slices::ByteCharSlice));
+    store.register_early_pass(|| Box::new(cfg_not_test::CfgNotTest));
     // add lints here, do not remove this comment, it's used in `new_lint`
 }
 
diff --git a/src/tools/clippy/clippy_lints/src/literal_representation.rs b/src/tools/clippy/clippy_lints/src/literal_representation.rs
index d2a140a36a83f..7481543941a6b 100644
--- a/src/tools/clippy/clippy_lints/src/literal_representation.rs
+++ b/src/tools/clippy/clippy_lints/src/literal_representation.rs
@@ -233,11 +233,9 @@ impl_lint_pass!(LiteralDigitGrouping => [
 
 impl EarlyLintPass for LiteralDigitGrouping {
     fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
-        if in_external_macro(cx.sess(), expr.span) {
-            return;
-        }
-
-        if let ExprKind::Lit(lit) = expr.kind {
+        if let ExprKind::Lit(lit) = expr.kind
+            && !in_external_macro(cx.sess(), expr.span)
+        {
             self.check_lit(cx, lit, expr.span);
         }
     }
@@ -448,11 +446,9 @@ impl_lint_pass!(DecimalLiteralRepresentation => [DECIMAL_LITERAL_REPRESENTATION]
 
 impl EarlyLintPass for DecimalLiteralRepresentation {
     fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
-        if in_external_macro(cx.sess(), expr.span) {
-            return;
-        }
-
-        if let ExprKind::Lit(lit) = expr.kind {
+        if let ExprKind::Lit(lit) = expr.kind
+            && !in_external_macro(cx.sess(), expr.span)
+        {
             self.check_lit(cx, lit, expr.span);
         }
     }
diff --git a/src/tools/clippy/clippy_lints/src/manual_bits.rs b/src/tools/clippy/clippy_lints/src/manual_bits.rs
index 24fc2b4faeacc..d9f6be6dc2b5c 100644
--- a/src/tools/clippy/clippy_lints/src/manual_bits.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_bits.rs
@@ -50,13 +50,10 @@ impl_lint_pass!(ManualBits => [MANUAL_BITS]);
 
 impl<'tcx> LateLintPass<'tcx> for ManualBits {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if !self.msrv.meets(msrvs::MANUAL_BITS) {
-            return;
-        }
-
         if let ExprKind::Binary(bin_op, left_expr, right_expr) = expr.kind
             && let BinOpKind::Mul = &bin_op.node
             && !in_external_macro(cx.sess(), expr.span)
+            && self.msrv.meets(msrvs::MANUAL_BITS)
             && let ctxt = expr.span.ctxt()
             && left_expr.span.ctxt() == ctxt
             && right_expr.span.ctxt() == ctxt
diff --git a/src/tools/clippy/clippy_lints/src/manual_float_methods.rs b/src/tools/clippy/clippy_lints/src/manual_float_methods.rs
index 89eea0b4456d4..03416ba96de73 100644
--- a/src/tools/clippy/clippy_lints/src/manual_float_methods.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_float_methods.rs
@@ -82,29 +82,26 @@ impl Variant {
 
 impl<'tcx> LateLintPass<'tcx> for ManualFloatMethods {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
-        if !in_external_macro(cx.sess(), expr.span)
-            && (
-                matches!(cx.tcx.constness(cx.tcx.hir().enclosing_body_owner(expr.hir_id)), Constness::NotConst)
-                    || cx.tcx.features().declared(sym!(const_float_classify))
-            ) && let ExprKind::Binary(kind, lhs, rhs) = expr.kind
+        if let ExprKind::Binary(kind, lhs, rhs) = expr.kind
             && let ExprKind::Binary(lhs_kind, lhs_lhs, lhs_rhs) = lhs.kind
             && let ExprKind::Binary(rhs_kind, rhs_lhs, rhs_rhs) = rhs.kind
             // Checking all possible scenarios using a function would be a hopeless task, as we have
             // 16 possible alignments of constants/operands. For now, let's use `partition`.
-            && let (operands, constants) = [lhs_lhs, lhs_rhs, rhs_lhs, rhs_rhs]
-                .into_iter()
-                .partition::<Vec<&Expr<'_>>, _>(|i| path_to_local(i).is_some())
-            && let [first, second] = &*operands
-            && let Some([const_1, const_2]) = constants
-                .into_iter()
-                .map(|i| constant(cx, cx.typeck_results(), i))
-                .collect::<Option<Vec<_>>>()
-                .as_deref()
+            && let mut exprs = [lhs_lhs, lhs_rhs, rhs_lhs, rhs_rhs]
+            && exprs.iter_mut().partition_in_place(|i| path_to_local(i).is_some()) == 2
+            && !in_external_macro(cx.sess(), expr.span)
+            && (
+                matches!(cx.tcx.constness(cx.tcx.hir().enclosing_body_owner(expr.hir_id)), Constness::NotConst)
+                    || cx.tcx.features().declared(sym!(const_float_classify))
+            )
+            && let [first, second, const_1, const_2] = exprs
+            && let Some(const_1) = constant(cx, cx.typeck_results(), const_1)
+            && let Some(const_2) = constant(cx, cx.typeck_results(), const_2)
             && path_to_local(first).is_some_and(|f| path_to_local(second).is_some_and(|s| f == s))
             // The actual infinity check, we also allow `NEG_INFINITY` before` INFINITY` just in
             // case somebody does that for some reason
-            && (is_infinity(const_1) && is_neg_infinity(const_2)
-                || is_neg_infinity(const_1) && is_infinity(const_2))
+            && (is_infinity(&const_1) && is_neg_infinity(&const_2)
+                || is_neg_infinity(&const_1) && is_infinity(&const_2))
             && let Some(local_snippet) = snippet_opt(cx, first.span)
         {
             let variant = match (kind.node, lhs_kind.node, rhs_kind.node) {
diff --git a/src/tools/clippy/clippy_lints/src/manual_let_else.rs b/src/tools/clippy/clippy_lints/src/manual_let_else.rs
index 03e4d668dd8fb..ebebdf679a863 100644
--- a/src/tools/clippy/clippy_lints/src/manual_let_else.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_let_else.rs
@@ -49,16 +49,14 @@ declare_clippy_lint! {
 
 impl<'tcx> QuestionMark {
     pub(crate) fn check_manual_let_else(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'tcx>) {
-        if !self.msrv.meets(msrvs::LET_ELSE) || in_external_macro(cx.sess(), stmt.span) {
-            return;
-        }
-
         if let StmtKind::Let(local) = stmt.kind
             && let Some(init) = local.init
             && local.els.is_none()
             && local.ty.is_none()
             && init.span.eq_ctxt(stmt.span)
             && let Some(if_let_or_match) = IfLetOrMatch::parse(cx, init)
+            && self.msrv.meets(msrvs::LET_ELSE)
+            && !in_external_macro(cx.sess(), stmt.span)
         {
             match if_let_or_match {
                 IfLetOrMatch::IfLet(if_let_expr, let_pat, if_then, if_else, ..) => {
diff --git a/src/tools/clippy/clippy_lints/src/manual_main_separator_str.rs b/src/tools/clippy/clippy_lints/src/manual_main_separator_str.rs
index 5732bdda7f2cf..8e8cdc3fb0764 100644
--- a/src/tools/clippy/clippy_lints/src/manual_main_separator_str.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_main_separator_str.rs
@@ -47,13 +47,13 @@ impl_lint_pass!(ManualMainSeparatorStr => [MANUAL_MAIN_SEPARATOR_STR]);
 
 impl LateLintPass<'_> for ManualMainSeparatorStr {
     fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
-        if self.msrv.meets(msrvs::PATH_MAIN_SEPARATOR_STR)
-            && let (target, _) = peel_hir_expr_refs(expr)
-            && is_trait_method(cx, target, sym::ToString)
-            && let ExprKind::MethodCall(path, receiver, &[], _) = target.kind
+        let (target, _) = peel_hir_expr_refs(expr);
+        if let ExprKind::MethodCall(path, receiver, &[], _) = target.kind
             && path.ident.name == sym::to_string
             && let ExprKind::Path(QPath::Resolved(None, path)) = receiver.kind
             && let Res::Def(DefKind::Const, receiver_def_id) = path.res
+            && is_trait_method(cx, target, sym::ToString)
+            && self.msrv.meets(msrvs::PATH_MAIN_SEPARATOR_STR)
             && match_def_path(cx, receiver_def_id, &paths::PATH_MAIN_SEPARATOR)
             && let ty::Ref(_, ty, Mutability::Not) = cx.typeck_results().expr_ty_adjusted(expr).kind()
             && ty.is_str()
diff --git a/src/tools/clippy/clippy_lints/src/manual_non_exhaustive.rs b/src/tools/clippy/clippy_lints/src/manual_non_exhaustive.rs
index d2ac0ad8363e9..73a505fd73ffc 100644
--- a/src/tools/clippy/clippy_lints/src/manual_non_exhaustive.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_non_exhaustive.rs
@@ -97,19 +97,15 @@ impl_lint_pass!(ManualNonExhaustiveEnum => [MANUAL_NON_EXHAUSTIVE]);
 
 impl EarlyLintPass for ManualNonExhaustiveStruct {
     fn check_item(&mut self, cx: &EarlyContext<'_>, item: &ast::Item) {
-        if !self.msrv.meets(msrvs::NON_EXHAUSTIVE) {
-            return;
-        }
-
-        if let ast::ItemKind::Struct(variant_data, _) = &item.kind {
-            let (fields, delimiter) = match variant_data {
+        if let ast::ItemKind::Struct(variant_data, _) = &item.kind
+            && let (fields, delimiter) = match variant_data {
                 ast::VariantData::Struct { fields, .. } => (&**fields, '{'),
                 ast::VariantData::Tuple(fields, _) => (&**fields, '('),
                 ast::VariantData::Unit(_) => return,
-            };
-            if fields.len() <= 1 {
-                return;
             }
+            && fields.len() > 1
+            && self.msrv.meets(msrvs::NON_EXHAUSTIVE)
+        {
             let mut iter = fields.iter().filter_map(|f| match f.vis.kind {
                 VisibilityKind::Public => None,
                 VisibilityKind::Inherited => Some(Ok(f)),
diff --git a/src/tools/clippy/clippy_lints/src/manual_range_patterns.rs b/src/tools/clippy/clippy_lints/src/manual_range_patterns.rs
index ec60de92c4ba2..07d4abbf5cd11 100644
--- a/src/tools/clippy/clippy_lints/src/manual_range_patterns.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_range_patterns.rs
@@ -76,14 +76,11 @@ impl Num {
 
 impl LateLintPass<'_> for ManualRangePatterns {
     fn check_pat(&mut self, cx: &LateContext<'_>, pat: &'_ rustc_hir::Pat<'_>) {
-        if in_external_macro(cx.sess(), pat.span) {
-            return;
-        }
-
         // a pattern like 1 | 2 seems fine, lint if there are at least 3 alternatives
         // or at least one range
         if let PatKind::Or(pats) = pat.kind
             && (pats.len() >= 3 || pats.iter().any(|p| matches!(p.kind, PatKind::Range(..))))
+            && !in_external_macro(cx.sess(), pat.span)
         {
             let mut min = Num::dummy(i128::MAX);
             let mut max = Num::dummy(i128::MIN);
diff --git a/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs b/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs
index ab9bca170cf77..b518dc26937c2 100644
--- a/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_rem_euclid.rs
@@ -48,35 +48,30 @@ impl_lint_pass!(ManualRemEuclid => [MANUAL_REM_EUCLID]);
 
 impl<'tcx> LateLintPass<'tcx> for ManualRemEuclid {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if !self.msrv.meets(msrvs::REM_EUCLID) {
-            return;
-        }
-
-        if in_constant(cx, expr.hir_id) && !self.msrv.meets(msrvs::REM_EUCLID_CONST) {
-            return;
-        }
-
-        if in_external_macro(cx.sess(), expr.span) {
-            return;
-        }
-
         // (x % c + c) % c
-        if let ExprKind::Binary(op1, expr1, right) = expr.kind
-            && op1.node == BinOpKind::Rem
+        if let ExprKind::Binary(rem_op, rem_lhs, rem_rhs) = expr.kind
+            && rem_op.node == BinOpKind::Rem
+            && let ExprKind::Binary(add_op, add_lhs, add_rhs) = rem_lhs.kind
+            && add_op.node == BinOpKind::Add
             && let ctxt = expr.span.ctxt()
-            && expr1.span.ctxt() == ctxt
-            && let Some(const1) = check_for_unsigned_int_constant(cx, right)
-            && let ExprKind::Binary(op2, left, right) = expr1.kind
-            && op2.node == BinOpKind::Add
-            && let Some((const2, expr2)) = check_for_either_unsigned_int_constant(cx, left, right)
-            && expr2.span.ctxt() == ctxt
-            && let ExprKind::Binary(op3, expr3, right) = expr2.kind
-            && op3.node == BinOpKind::Rem
-            && let Some(const3) = check_for_unsigned_int_constant(cx, right)
+            && rem_lhs.span.ctxt() == ctxt
+            && rem_rhs.span.ctxt() == ctxt
+            && add_lhs.span.ctxt() == ctxt
+            && add_rhs.span.ctxt() == ctxt
+            && !in_external_macro(cx.sess(), expr.span)
+            && self.msrv.meets(msrvs::REM_EUCLID)
+            && (self.msrv.meets(msrvs::REM_EUCLID_CONST) || !in_constant(cx, expr.hir_id))
+            && let Some(const1) = check_for_unsigned_int_constant(cx, rem_rhs)
+            && let Some((const2, add_other)) = check_for_either_unsigned_int_constant(cx, add_lhs, add_rhs)
+            && let ExprKind::Binary(rem2_op, rem2_lhs, rem2_rhs) = add_other.kind
+            && rem2_op.node == BinOpKind::Rem
+            && const1 == const2
+            && let Some(hir_id) = path_to_local(rem2_lhs)
+            && let Some(const3) = check_for_unsigned_int_constant(cx, rem2_rhs)
             // Also ensures the const is nonzero since zero can't be a divisor
-            && const1 == const2 && const2 == const3
-            && let Some(hir_id) = path_to_local(expr3)
-            && let Node::Pat(_) = cx.tcx.hir_node(hir_id)
+            && const2 == const3
+            && rem2_lhs.span.ctxt() == ctxt
+            && rem2_rhs.span.ctxt() == ctxt
         {
             // Apply only to params or locals with annotated types
             match cx.tcx.parent_hir_node(hir_id) {
@@ -91,7 +86,7 @@ impl<'tcx> LateLintPass<'tcx> for ManualRemEuclid {
             };
 
             let mut app = Applicability::MachineApplicable;
-            let rem_of = snippet_with_context(cx, expr3.span, ctxt, "_", &mut app).0;
+            let rem_of = snippet_with_context(cx, rem2_lhs.span, ctxt, "_", &mut app).0;
             span_lint_and_sugg(
                 cx,
                 MANUAL_REM_EUCLID,
diff --git a/src/tools/clippy/clippy_lints/src/manual_retain.rs b/src/tools/clippy/clippy_lints/src/manual_retain.rs
index 3ddb06a1e08a1..8f7b8abd0c383 100644
--- a/src/tools/clippy/clippy_lints/src/manual_retain.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_retain.rs
@@ -70,9 +70,8 @@ impl_lint_pass!(ManualRetain => [MANUAL_RETAIN]);
 impl<'tcx> LateLintPass<'tcx> for ManualRetain {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
         if let Assign(left_expr, collect_expr, _) = &expr.kind
-            && let hir::ExprKind::MethodCall(seg, ..) = &collect_expr.kind
+            && let hir::ExprKind::MethodCall(seg, target_expr, [], _) = &collect_expr.kind
             && seg.args.is_none()
-            && let hir::ExprKind::MethodCall(_, target_expr, [], _) = &collect_expr.kind
             && let Some(collect_def_id) = cx.typeck_results().type_dependent_def_id(collect_expr.hir_id)
             && cx.tcx.is_diagnostic_item(sym::iterator_collect_fn, collect_def_id)
         {
diff --git a/src/tools/clippy/clippy_lints/src/manual_rotate.rs b/src/tools/clippy/clippy_lints/src/manual_rotate.rs
new file mode 100644
index 0000000000000..a517a4d507526
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/manual_rotate.rs
@@ -0,0 +1,117 @@
+use std::fmt::Display;
+
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::sugg;
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::declare_lint_pass;
+
+declare_clippy_lint! {
+    /// ### What it does
+    ///
+    /// It detects manual bit rotations that could be rewritten using standard
+    /// functions `rotate_left` or `rotate_right`.
+    ///
+    /// ### Why is this bad?
+    ///
+    /// Calling the function better conveys the intent.
+    ///
+    /// ### Known issues
+    ///
+    /// Currently, the lint only catches shifts by constant amount.
+    ///
+    /// ### Example
+    /// ```no_run
+    /// let x = 12345678_u32;
+    /// let _ = (x >> 8) | (x << 24);
+    /// ```
+    /// Use instead:
+    /// ```no_run
+    /// let x = 12345678_u32;
+    /// let _ = x.rotate_right(8);
+    /// ```
+    #[clippy::version = "1.81.0"]
+    pub MANUAL_ROTATE,
+    style,
+    "using bit shifts to rotate integers"
+}
+
+declare_lint_pass!(ManualRotate => [MANUAL_ROTATE]);
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum ShiftDirection {
+    Left,
+    Right,
+}
+
+impl Display for ShiftDirection {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(match self {
+            Self::Left => "rotate_left",
+            Self::Right => "rotate_right",
+        })
+    }
+}
+
+fn parse_shift<'tcx>(
+    cx: &LateContext<'tcx>,
+    expr: &'tcx Expr<'tcx>,
+) -> Option<(ShiftDirection, u128, &'tcx Expr<'tcx>)> {
+    if let ExprKind::Binary(op, l, r) = expr.kind {
+        let dir = match op.node {
+            BinOpKind::Shl => ShiftDirection::Left,
+            BinOpKind::Shr => ShiftDirection::Right,
+            _ => return None,
+        };
+        let const_expr = constant(cx, cx.typeck_results(), r)?;
+        if let Constant::Int(shift) = const_expr {
+            return Some((dir, shift, l));
+        }
+    }
+    None
+}
+
+impl LateLintPass<'_> for ManualRotate {
+    fn check_expr<'tcx>(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
+        if let ExprKind::Binary(op, l, r) = expr.kind
+            && let BinOpKind::Add | BinOpKind::BitOr = op.node
+            && let Some((l_shift_dir, l_amount, l_expr)) = parse_shift(cx, l)
+            && let Some((r_shift_dir, r_amount, r_expr)) = parse_shift(cx, r)
+        {
+            if l_shift_dir == r_shift_dir {
+                return;
+            }
+            if !clippy_utils::eq_expr_value(cx, l_expr, r_expr) {
+                return;
+            }
+            let Some(bit_width) = (match cx.typeck_results().expr_ty(expr).kind() {
+                ty::Int(itype) => itype.bit_width(),
+                ty::Uint(itype) => itype.bit_width(),
+                _ => return,
+            }) else {
+                return;
+            };
+            if l_amount + r_amount == u128::from(bit_width) {
+                let (shift_function, amount) = if l_amount < r_amount {
+                    (l_shift_dir, l_amount)
+                } else {
+                    (r_shift_dir, r_amount)
+                };
+                let mut applicability = Applicability::MachineApplicable;
+                let expr_sugg = sugg::Sugg::hir_with_applicability(cx, l_expr, "_", &mut applicability).maybe_par();
+                span_lint_and_sugg(
+                    cx,
+                    MANUAL_ROTATE,
+                    expr.span,
+                    "there is no need to manually implement bit rotation",
+                    "this expression can be rewritten as",
+                    format!("{expr_sugg}.{shift_function}({amount})"),
+                    Applicability::MachineApplicable,
+                );
+            }
+        }
+    }
+}
diff --git a/src/tools/clippy/clippy_lints/src/manual_slice_size_calculation.rs b/src/tools/clippy/clippy_lints/src/manual_slice_size_calculation.rs
index 1de686dbcb51e..429ee2637c2fa 100644
--- a/src/tools/clippy/clippy_lints/src/manual_slice_size_calculation.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_slice_size_calculation.rs
@@ -40,11 +40,11 @@ declare_lint_pass!(ManualSliceSizeCalculation => [MANUAL_SLICE_SIZE_CALCULATION]
 
 impl<'tcx> LateLintPass<'tcx> for ManualSliceSizeCalculation {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
-        // Does not apply inside const because size_of_val is not cost in stable.
-        if !in_constant(cx, expr.hir_id)
-            && let ExprKind::Binary(ref op, left, right) = expr.kind
+        if let ExprKind::Binary(ref op, left, right) = expr.kind
             && BinOpKind::Mul == op.node
             && !expr.span.from_expansion()
+            // Does not apply inside const because size_of_val is not cost in stable.
+            && !in_constant(cx, expr.hir_id)
             && let Some(receiver) = simplify(cx, left, right)
         {
             let ctxt = expr.span.ctxt();
diff --git a/src/tools/clippy/clippy_lints/src/manual_strip.rs b/src/tools/clippy/clippy_lints/src/manual_strip.rs
index 45af9f07718d2..6a523ad156472 100644
--- a/src/tools/clippy/clippy_lints/src/manual_strip.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_strip.rs
@@ -66,14 +66,11 @@ enum StripKind {
 
 impl<'tcx> LateLintPass<'tcx> for ManualStrip {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if !self.msrv.meets(msrvs::STR_STRIP_PREFIX) {
-            return;
-        }
-
         if let Some(higher::If { cond, then, .. }) = higher::If::hir(expr)
             && let ExprKind::MethodCall(_, target_arg, [pattern], _) = cond.kind
-            && let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(cond.hir_id)
             && let ExprKind::Path(target_path) = &target_arg.kind
+            && self.msrv.meets(msrvs::STR_STRIP_PREFIX)
+            && let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(cond.hir_id)
         {
             let strip_kind = if match_def_path(cx, method_def_id, &paths::STR_STARTS_WITH) {
                 StripKind::Prefix
diff --git a/src/tools/clippy/clippy_lints/src/manual_unwrap_or_default.rs b/src/tools/clippy/clippy_lints/src/manual_unwrap_or_default.rs
index 58b2ebebbf080..f1acc4b217480 100644
--- a/src/tools/clippy/clippy_lints/src/manual_unwrap_or_default.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_unwrap_or_default.rs
@@ -172,11 +172,10 @@ fn handle<'tcx>(cx: &LateContext<'tcx>, if_let_or_match: IfLetOrMatch<'tcx>, exp
 
 impl<'tcx> LateLintPass<'tcx> for ManualUnwrapOrDefault {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
-        if expr.span.from_expansion() || in_constant(cx, expr.hir_id) {
-            return;
-        }
-        // Call handle only if the expression is `if let` or `match`
-        if let Some(if_let_or_match) = IfLetOrMatch::parse(cx, expr) {
+        if let Some(if_let_or_match) = IfLetOrMatch::parse(cx, expr)
+            && !expr.span.from_expansion()
+            && !in_constant(cx, expr.hir_id)
+        {
             handle(cx, if_let_or_match, expr);
         }
     }
diff --git a/src/tools/clippy/clippy_lints/src/map_unit_fn.rs b/src/tools/clippy/clippy_lints/src/map_unit_fn.rs
index 9db04b615be7b..2db71b1f7a388 100644
--- a/src/tools/clippy/clippy_lints/src/map_unit_fn.rs
+++ b/src/tools/clippy/clippy_lints/src/map_unit_fn.rs
@@ -253,14 +253,11 @@ fn lint_map_unit_fn(
 
 impl<'tcx> LateLintPass<'tcx> for MapUnit {
     fn check_stmt(&mut self, cx: &LateContext<'_>, stmt: &hir::Stmt<'_>) {
-        if stmt.span.from_expansion() {
-            return;
-        }
-
-        if let hir::StmtKind::Semi(expr) = stmt.kind {
-            if let Some(arglists) = method_chain_args(expr, &["map"]) {
-                lint_map_unit_fn(cx, stmt, expr, arglists[0]);
-            }
+        if let hir::StmtKind::Semi(expr) = stmt.kind
+            && !stmt.span.from_expansion()
+            && let Some(arglists) = method_chain_args(expr, &["map"])
+        {
+            lint_map_unit_fn(cx, stmt, expr, arglists[0]);
         }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/matches/mod.rs b/src/tools/clippy/clippy_lints/src/matches/mod.rs
index bf7156cc53ec3..22a299ae3d82f 100644
--- a/src/tools/clippy/clippy_lints/src/matches/mod.rs
+++ b/src/tools/clippy/clippy_lints/src/matches/mod.rs
@@ -1019,6 +1019,7 @@ impl_lint_pass!(Matches => [
 ]);
 
 impl<'tcx> LateLintPass<'tcx> for Matches {
+    #[expect(clippy::too_many_lines)]
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if is_direct_expn_of(expr.span, "matches").is_none() && in_external_macro(cx.sess(), expr.span) {
             return;
@@ -1037,7 +1038,7 @@ impl<'tcx> LateLintPass<'tcx> for Matches {
                 return;
             }
             if matches!(source, MatchSource::Normal | MatchSource::ForLoopDesugar) {
-                significant_drop_in_scrutinee::check(cx, expr, ex, arms, source);
+                significant_drop_in_scrutinee::check_match(cx, expr, ex, arms, source);
             }
 
             collapsible_match::check_match(cx, arms, &self.msrv);
@@ -1084,6 +1085,7 @@ impl<'tcx> LateLintPass<'tcx> for Matches {
             }
         } else if let Some(if_let) = higher::IfLet::hir(cx, expr) {
             collapsible_match::check_if_let(cx, if_let.let_pat, if_let.if_then, if_let.if_else, &self.msrv);
+            significant_drop_in_scrutinee::check_if_let(cx, expr, if_let.let_expr, if_let.if_then, if_let.if_else);
             if !from_expansion {
                 if let Some(else_expr) = if_let.if_else {
                     if self.msrv.meets(msrvs::MATCHES_MACRO) {
@@ -1126,8 +1128,13 @@ impl<'tcx> LateLintPass<'tcx> for Matches {
                 );
                 needless_match::check_if_let(cx, expr, &if_let);
             }
-        } else if !from_expansion {
-            redundant_pattern_match::check(cx, expr);
+        } else {
+            if let Some(while_let) = higher::WhileLet::hir(expr) {
+                significant_drop_in_scrutinee::check_while_let(cx, expr, while_let.let_expr, while_let.if_then);
+            }
+            if !from_expansion {
+                redundant_pattern_match::check(cx, expr);
+            }
         }
     }
 
diff --git a/src/tools/clippy/clippy_lints/src/matches/significant_drop_in_scrutinee.rs b/src/tools/clippy/clippy_lints/src/matches/significant_drop_in_scrutinee.rs
index 2f72e59834fa6..9047c9627d9ac 100644
--- a/src/tools/clippy/clippy_lints/src/matches/significant_drop_in_scrutinee.rs
+++ b/src/tools/clippy/clippy_lints/src/matches/significant_drop_in_scrutinee.rs
@@ -16,7 +16,7 @@ use rustc_span::Span;
 
 use super::SIGNIFICANT_DROP_IN_SCRUTINEE;
 
-pub(super) fn check<'tcx>(
+pub(super) fn check_match<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &'tcx Expr<'tcx>,
     scrutinee: &'tcx Expr<'_>,
@@ -27,10 +27,89 @@ pub(super) fn check<'tcx>(
         return;
     }
 
-    let (suggestions, message) = has_significant_drop_in_scrutinee(cx, scrutinee, source);
+    let scrutinee = match (source, &scrutinee.kind) {
+        (MatchSource::ForLoopDesugar, ExprKind::Call(_, [e])) => e,
+        _ => scrutinee,
+    };
+
+    let message = if source == MatchSource::Normal {
+        "temporary with significant `Drop` in `match` scrutinee will live until the end of the `match` expression"
+    } else {
+        "temporary with significant `Drop` in `for` loop condition will live until the end of the `for` expression"
+    };
+
+    let arms = arms.iter().map(|arm| arm.body).collect::<Vec<_>>();
+
+    check(cx, expr, scrutinee, &arms, message, Suggestion::Emit);
+}
+
+pub(super) fn check_if_let<'tcx>(
+    cx: &LateContext<'tcx>,
+    expr: &'tcx Expr<'tcx>,
+    scrutinee: &'tcx Expr<'_>,
+    if_then: &'tcx Expr<'_>,
+    if_else: Option<&'tcx Expr<'_>>,
+) {
+    if is_lint_allowed(cx, SIGNIFICANT_DROP_IN_SCRUTINEE, expr.hir_id) {
+        return;
+    }
+
+    let message =
+        "temporary with significant `Drop` in `if let` scrutinee will live until the end of the `if let` expression";
+
+    if let Some(if_else) = if_else {
+        check(cx, expr, scrutinee, &[if_then, if_else], message, Suggestion::Emit);
+    } else {
+        check(cx, expr, scrutinee, &[if_then], message, Suggestion::Emit);
+    }
+}
+
+pub(super) fn check_while_let<'tcx>(
+    cx: &LateContext<'tcx>,
+    expr: &'tcx Expr<'tcx>,
+    scrutinee: &'tcx Expr<'_>,
+    body: &'tcx Expr<'_>,
+) {
+    if is_lint_allowed(cx, SIGNIFICANT_DROP_IN_SCRUTINEE, expr.hir_id) {
+        return;
+    }
+
+    check(
+        cx,
+        expr,
+        scrutinee,
+        &[body],
+        "temporary with significant `Drop` in `while let` scrutinee will live until the end of the `while let` expression",
+        // Don't emit wrong suggestions: We cannot fix the significant drop in the `while let` scrutinee by simply
+        // moving it out. We need to change the `while` to a `loop` instead.
+        Suggestion::DontEmit,
+    );
+}
+
+#[derive(Copy, Clone, Debug)]
+enum Suggestion {
+    Emit,
+    DontEmit,
+}
+
+fn check<'tcx>(
+    cx: &LateContext<'tcx>,
+    expr: &'tcx Expr<'tcx>,
+    scrutinee: &'tcx Expr<'_>,
+    arms: &[&'tcx Expr<'_>],
+    message: &'static str,
+    sugg: Suggestion,
+) {
+    let mut helper = SigDropHelper::new(cx);
+    let suggestions = helper.find_sig_drop(scrutinee);
+
     for found in suggestions {
         span_lint_and_then(cx, SIGNIFICANT_DROP_IN_SCRUTINEE, found.found_span, message, |diag| {
-            set_diagnostic(diag, cx, expr, found);
+            match sugg {
+                Suggestion::Emit => set_suggestion(diag, cx, expr, found),
+                Suggestion::DontEmit => (),
+            }
+
             let s = Span::new(expr.span.hi(), expr.span.hi(), expr.span.ctxt(), None);
             diag.span_label(s, "temporary lives until here");
             for span in has_significant_drop_in_arms(cx, arms) {
@@ -41,7 +120,7 @@ pub(super) fn check<'tcx>(
     }
 }
 
-fn set_diagnostic<'tcx>(diag: &mut Diag<'_, ()>, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, found: FoundSigDrop) {
+fn set_suggestion<'tcx>(diag: &mut Diag<'_, ()>, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, found: FoundSigDrop) {
     let original = snippet(cx, found.found_span, "..");
     let trailing_indent = " ".repeat(indent_of(cx, found.found_span).unwrap_or(0));
 
@@ -79,26 +158,6 @@ fn set_diagnostic<'tcx>(diag: &mut Diag<'_, ()>, cx: &LateContext<'tcx>, expr: &
     );
 }
 
-/// If the expression is an `ExprKind::Match`, check if the scrutinee has a significant drop that
-/// may have a surprising lifetime.
-fn has_significant_drop_in_scrutinee<'tcx>(
-    cx: &LateContext<'tcx>,
-    scrutinee: &'tcx Expr<'tcx>,
-    source: MatchSource,
-) -> (Vec<FoundSigDrop>, &'static str) {
-    let mut helper = SigDropHelper::new(cx);
-    let scrutinee = match (source, &scrutinee.kind) {
-        (MatchSource::ForLoopDesugar, ExprKind::Call(_, [e])) => e,
-        _ => scrutinee,
-    };
-    let message = if source == MatchSource::Normal {
-        "temporary with significant `Drop` in `match` scrutinee will live until the end of the `match` expression"
-    } else {
-        "temporary with significant `Drop` in `for` loop condition will live until the end of the `for` expression"
-    };
-    (helper.find_sig_drop(scrutinee), message)
-}
-
 struct SigDropChecker<'a, 'tcx> {
     seen_types: FxHashSet<Ty<'tcx>>,
     cx: &'a LateContext<'tcx>,
@@ -428,10 +487,10 @@ impl<'a, 'tcx> ArmSigDropHelper<'a, 'tcx> {
     }
 }
 
-fn has_significant_drop_in_arms<'tcx>(cx: &LateContext<'tcx>, arms: &'tcx [Arm<'_>]) -> FxHashSet<Span> {
+fn has_significant_drop_in_arms<'tcx>(cx: &LateContext<'tcx>, arms: &[&'tcx Expr<'_>]) -> FxHashSet<Span> {
     let mut helper = ArmSigDropHelper::new(cx);
     for arm in arms {
-        helper.visit_expr(arm.body);
+        helper.visit_expr(arm);
     }
     helper.found_sig_drop_spans
 }
diff --git a/src/tools/clippy/clippy_lints/src/methods/manual_inspect.rs b/src/tools/clippy/clippy_lints/src/methods/manual_inspect.rs
index e3ce64c246a54..cac2e11f59166 100644
--- a/src/tools/clippy/clippy_lints/src/methods/manual_inspect.rs
+++ b/src/tools/clippy/clippy_lints/src/methods/manual_inspect.rs
@@ -167,14 +167,12 @@ pub(crate) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, arg: &Expr<'_>, name:
             } else {
                 edits.extend(addr_of_edits);
             }
-            edits.push((
-                name_span,
-                String::from(match name {
-                    "map" => "inspect",
-                    "map_err" => "inspect_err",
-                    _ => return,
-                }),
-            ));
+            let edit = match name {
+                "map" => "inspect",
+                "map_err" => "inspect_err",
+                _ => return,
+            };
+            edits.push((name_span, edit.to_string()));
             edits.push((
                 final_expr
                     .span
@@ -187,9 +185,15 @@ pub(crate) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, arg: &Expr<'_>, name:
             } else {
                 Applicability::MachineApplicable
             };
-            span_lint_and_then(cx, MANUAL_INSPECT, name_span, "", |diag| {
-                diag.multipart_suggestion("try", edits, app);
-            });
+            span_lint_and_then(
+                cx,
+                MANUAL_INSPECT,
+                name_span,
+                format!("using `{name}` over `{edit}`"),
+                |diag| {
+                    diag.multipart_suggestion("try", edits, app);
+                },
+            );
         }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/methods/mod.rs b/src/tools/clippy/clippy_lints/src/methods/mod.rs
index 1408f45482007..a846552cddfa2 100644
--- a/src/tools/clippy/clippy_lints/src/methods/mod.rs
+++ b/src/tools/clippy/clippy_lints/src/methods/mod.rs
@@ -628,12 +628,11 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for usage of `_.and_then(|x| Some(y))`, `_.and_then(|x| Ok(y))` or
-    /// `_.or_else(|x| Err(y))`.
+    /// Checks for usage of `_.and_then(|x| Some(y))`, `_.and_then(|x| Ok(y))`
+    /// or `_.or_else(|x| Err(y))`.
     ///
     /// ### Why is this bad?
-    /// Readability, this can be written more concisely as
-    /// `_.map(|x| y)` or `_.map_err(|x| y)`.
+    /// This can be written more concisely as `_.map(|x| y)` or `_.map_err(|x| y)`.
     ///
     /// ### Example
     /// ```no_run
@@ -4121,7 +4120,7 @@ declare_clippy_lint! {
     /// ```no_run
     /// let x = Some(0).inspect(|x| println!("{x}"));
     /// ```
-    #[clippy::version = "1.78.0"]
+    #[clippy::version = "1.81.0"]
     pub MANUAL_INSPECT,
     complexity,
     "use of `map` returning the original item"
diff --git a/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs b/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs
index ae9aa83efd685..5d899415d7728 100644
--- a/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs
+++ b/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs
@@ -1,13 +1,15 @@
 use super::implicit_clone::is_clone_like;
 use super::unnecessary_iter_cloned::{self, is_into_iter};
 use clippy_config::msrvs::{self, Msrv};
-use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::source::snippet_opt;
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::source::{snippet, snippet_opt};
 use clippy_utils::ty::{
     get_iterator_item_ty, implements_trait, is_copy, is_type_diagnostic_item, is_type_lang_item, peel_mid_ty_refs,
 };
 use clippy_utils::visitors::find_all_ret_expressions;
-use clippy_utils::{fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, return_ty};
+use clippy_utils::{
+    fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, match_def_path, paths, return_ty,
+};
 use rustc_errors::Applicability;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
@@ -52,6 +54,9 @@ pub fn check<'tcx>(
             if check_into_iter_call_arg(cx, expr, method_name, receiver, msrv) {
                 return;
             }
+            if check_string_from_utf8(cx, expr, receiver) {
+                return;
+            }
             check_other_call_arg(cx, expr, method_name, receiver);
         }
     } else {
@@ -240,6 +245,65 @@ fn check_into_iter_call_arg(
     false
 }
 
+/// Checks for `&String::from_utf8(bytes.{to_vec,to_owned,...}()).unwrap()` coercing to `&str`,
+/// which can be written as just `std::str::from_utf8(bytes).unwrap()`.
+fn check_string_from_utf8<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, receiver: &'tcx Expr<'tcx>) -> bool {
+    if let Some((call, arg)) = skip_addr_of_ancestors(cx, expr)
+        && !arg.span.from_expansion()
+        && let ExprKind::Call(callee, _) = call.kind
+        && fn_def_id(cx, call).is_some_and(|did| match_def_path(cx, did, &paths::STRING_FROM_UTF8))
+        && let Some(unwrap_call) = get_parent_expr(cx, call)
+        && let ExprKind::MethodCall(unwrap_method_name, ..) = unwrap_call.kind
+        && matches!(unwrap_method_name.ident.name, sym::unwrap | sym::expect)
+        && let Some(ref_string) = get_parent_expr(cx, unwrap_call)
+        && let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, _) = ref_string.kind
+        && let adjusted_ty = cx.typeck_results().expr_ty_adjusted(ref_string)
+        // `&...` creates a `&String`, so only actually lint if this coerces to a `&str`
+        && matches!(adjusted_ty.kind(), ty::Ref(_, ty, _) if ty.is_str())
+    {
+        span_lint_and_then(
+            cx,
+            UNNECESSARY_TO_OWNED,
+            ref_string.span,
+            "allocating a new `String` only to create a temporary `&str` from it",
+            |diag| {
+                let arg_suggestion = format!(
+                    "{borrow}{recv_snippet}",
+                    recv_snippet = snippet(cx, receiver.span.source_callsite(), ".."),
+                    borrow = if cx.typeck_results().expr_ty(receiver).is_ref() {
+                        ""
+                    } else {
+                        // If not already a reference, prefix with a borrow so that it can coerce to one
+                        "&"
+                    }
+                );
+
+                diag.multipart_suggestion(
+                    "convert from `&[u8]` to `&str` directly",
+                    vec![
+                        // `&String::from_utf8(bytes.to_vec()).unwrap()`
+                        //   ^^^^^^^^^^^^^^^^^
+                        (callee.span, "core::str::from_utf8".into()),
+                        // `&String::from_utf8(bytes.to_vec()).unwrap()`
+                        //  ^
+                        (
+                            ref_string.span.shrink_to_lo().to(unwrap_call.span.shrink_to_lo()),
+                            String::new(),
+                        ),
+                        // `&String::from_utf8(bytes.to_vec()).unwrap()`
+                        //                     ^^^^^^^^^^^^^^
+                        (arg.span, arg_suggestion),
+                    ],
+                    Applicability::MachineApplicable,
+                );
+            },
+        );
+        true
+    } else {
+        false
+    }
+}
+
 /// Checks whether `expr` is an argument in an `into_iter` call and, if so, determines whether its
 /// call of a `to_owned`-like function is unnecessary.
 fn check_split_call_arg(cx: &LateContext<'_>, expr: &Expr<'_>, method_name: Symbol, receiver: &Expr<'_>) -> bool {
diff --git a/src/tools/clippy/clippy_lints/src/methods/unwrap_expect_used.rs b/src/tools/clippy/clippy_lints/src/methods/unwrap_expect_used.rs
index 516b8984ad79d..5b0bd0f716ab2 100644
--- a/src/tools/clippy/clippy_lints/src/methods/unwrap_expect_used.rs
+++ b/src/tools/clippy/clippy_lints/src/methods/unwrap_expect_used.rs
@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::ty::{is_never_like, is_type_diagnostic_item};
-use clippy_utils::{is_in_cfg_test, is_in_test_function, is_lint_allowed};
+use clippy_utils::{is_in_test, is_lint_allowed};
 use rustc_hir::Expr;
 use rustc_lint::{LateContext, Lint};
 use rustc_middle::ty;
@@ -61,7 +61,7 @@ pub(super) fn check(
 
     let method_suffix = if is_err { "_err" } else { "" };
 
-    if allow_unwrap_in_tests && (is_in_test_function(cx.tcx, expr.hir_id) || is_in_cfg_test(cx.tcx, expr.hir_id)) {
+    if allow_unwrap_in_tests && is_in_test(cx.tcx, expr.hir_id) {
         return;
     }
 
diff --git a/src/tools/clippy/clippy_lints/src/minmax.rs b/src/tools/clippy/clippy_lints/src/minmax.rs
index fca626fa5c35c..c3fbca1d560e6 100644
--- a/src/tools/clippy/clippy_lints/src/minmax.rs
+++ b/src/tools/clippy/clippy_lints/src/minmax.rs
@@ -5,7 +5,7 @@ use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
 use rustc_span::sym;
-use std::cmp::Ordering;
+use std::cmp::Ordering::{Equal, Greater, Less};
 
 declare_clippy_lint! {
     /// ### What it does
@@ -36,26 +36,21 @@ declare_lint_pass!(MinMaxPass => [MIN_MAX]);
 
 impl<'tcx> LateLintPass<'tcx> for MinMaxPass {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if let Some((outer_max, outer_c, oe)) = min_max(cx, expr) {
-            if let Some((inner_max, inner_c, ie)) = min_max(cx, oe) {
-                if outer_max == inner_max {
-                    return;
-                }
-                match (
-                    outer_max,
-                    Constant::partial_cmp(cx.tcx, cx.typeck_results().expr_ty(ie), &outer_c, &inner_c),
-                ) {
-                    (_, None) | (MinMax::Max, Some(Ordering::Less)) | (MinMax::Min, Some(Ordering::Greater)) => (),
-                    _ => {
-                        span_lint(
-                            cx,
-                            MIN_MAX,
-                            expr.span,
-                            "this `min`/`max` combination leads to constant result",
-                        );
-                    },
-                }
-            }
+        if let Some((outer_max, outer_c, oe)) = min_max(cx, expr)
+            && let Some((inner_max, inner_c, ie)) = min_max(cx, oe)
+            && outer_max != inner_max
+            && let Some(ord) = Constant::partial_cmp(cx.tcx, cx.typeck_results().expr_ty(ie), &outer_c, &inner_c)
+            && matches!(
+                (outer_max, ord),
+                (MinMax::Max, Equal | Greater) | (MinMax::Min, Equal | Less)
+            )
+        {
+            span_lint(
+                cx,
+                MIN_MAX,
+                expr.span,
+                "this `min`/`max` combination leads to constant result",
+            );
         }
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/misc.rs b/src/tools/clippy/clippy_lints/src/misc.rs
index f3f9bf11a61c4..32c8731c53743 100644
--- a/src/tools/clippy/clippy_lints/src/misc.rs
+++ b/src/tools/clippy/clippy_lints/src/misc.rs
@@ -2,8 +2,8 @@ use clippy_utils::diagnostics::{span_lint, span_lint_and_then, span_lint_hir_and
 use clippy_utils::source::{snippet, snippet_with_context};
 use clippy_utils::sugg::Sugg;
 use clippy_utils::{
-    any_parent_is_automatically_derived, fulfill_or_allowed, get_parent_expr, is_lint_allowed, iter_input_pats,
-    last_path_segment, SpanlessEq,
+    fulfill_or_allowed, get_parent_expr, in_automatically_derived, is_lint_allowed, iter_input_pats, last_path_segment,
+    SpanlessEq,
 };
 use rustc_errors::Applicability;
 use rustc_hir::def::Res;
@@ -206,7 +206,7 @@ impl<'tcx> LateLintPass<'tcx> for LintPass {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if in_external_macro(cx.sess(), expr.span)
             || expr.span.desugaring_kind().is_some()
-            || any_parent_is_automatically_derived(cx.tcx, expr.hir_id)
+            || in_automatically_derived(cx.tcx, expr.hir_id)
         {
             return;
         }
diff --git a/src/tools/clippy/clippy_lints/src/missing_assert_message.rs b/src/tools/clippy/clippy_lints/src/missing_assert_message.rs
index dd98352da8601..935ed48dacc50 100644
--- a/src/tools/clippy/clippy_lints/src/missing_assert_message.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_assert_message.rs
@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::is_in_test;
 use clippy_utils::macros::{find_assert_args, find_assert_eq_args, root_macro_call_first_node, PanicExpn};
-use clippy_utils::{is_in_cfg_test, is_in_test_function};
 use rustc_hir::Expr;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
@@ -62,7 +62,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingAssertMessage {
         };
 
         // This lint would be very noisy in tests, so just ignore if we're in test context
-        if is_in_test_function(cx.tcx, expr.hir_id) || is_in_cfg_test(cx.tcx, expr.hir_id) {
+        if is_in_test(cx.tcx, expr.hir_id) {
             return;
         }
 
diff --git a/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs b/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
index bb0d714a31fd4..ed5f46ddc8d20 100644
--- a/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
@@ -8,9 +8,11 @@ use rustc_hir::intravisit::FnKind;
 use rustc_hir::{self as hir, Body, Constness, FnDecl, GenericParamKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
 use rustc_session::impl_lint_pass;
 use rustc_span::def_id::LocalDefId;
 use rustc_span::Span;
+use rustc_target::spec::abi::Abi;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -115,7 +117,10 @@ impl<'tcx> LateLintPass<'tcx> for MissingConstForFn {
                     .iter()
                     .any(|param| matches!(param.kind, GenericParamKind::Const { .. }));
 
-                if already_const(header) || has_const_generic_params {
+                if already_const(header)
+                    || has_const_generic_params
+                    || !could_be_const_with_abi(cx, &self.msrv, header.abi)
+                {
                     return;
                 }
             },
@@ -127,6 +132,10 @@ impl<'tcx> LateLintPass<'tcx> for MissingConstForFn {
             FnKind::Closure => return,
         }
 
+        if fn_inputs_has_impl_trait_ty(cx, def_id) {
+            return;
+        }
+
         let hir_id = cx.tcx.local_def_id_to_hir_id(def_id);
 
         // Const fns are not allowed as methods in a trait.
@@ -171,3 +180,25 @@ impl<'tcx> LateLintPass<'tcx> for MissingConstForFn {
 fn already_const(header: hir::FnHeader) -> bool {
     header.constness == Constness::Const
 }
+
+fn could_be_const_with_abi(cx: &LateContext<'_>, msrv: &Msrv, abi: Abi) -> bool {
+    match abi {
+        Abi::Rust => true,
+        // `const extern "C"` was stablized after 1.62.0
+        Abi::C { unwind: false } => msrv.meets(msrvs::CONST_EXTERN_FN),
+        // Rest ABIs are still unstable and need the `const_extern_fn` feature enabled.
+        _ => cx.tcx.features().const_extern_fn,
+    }
+}
+
+/// Return `true` when the given `def_id` is a function that has `impl Trait` ty as one of
+/// its parameter types.
+fn fn_inputs_has_impl_trait_ty(cx: &LateContext<'_>, def_id: LocalDefId) -> bool {
+    let inputs = cx.tcx.fn_sig(def_id).instantiate_identity().inputs().skip_binder();
+    inputs.iter().any(|input| {
+        matches!(
+            input.kind(),
+            ty::Alias(ty::AliasTyKind::Weak, alias_ty) if cx.tcx.type_of(alias_ty.def_id).skip_binder().is_impl_trait()
+        )
+    })
+}
diff --git a/src/tools/clippy/clippy_lints/src/thread_local_initializer_can_be_made_const.rs b/src/tools/clippy/clippy_lints/src/missing_const_for_thread_local.rs
similarity index 92%
rename from src/tools/clippy/clippy_lints/src/thread_local_initializer_can_be_made_const.rs
rename to src/tools/clippy/clippy_lints/src/missing_const_for_thread_local.rs
index 4af3ee74d0eaf..ab1b4aa3dee60 100644
--- a/src/tools/clippy/clippy_lints/src/thread_local_initializer_can_be_made_const.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_const_for_thread_local.rs
@@ -39,23 +39,23 @@ declare_clippy_lint! {
     /// }
     /// ```
     #[clippy::version = "1.77.0"]
-    pub THREAD_LOCAL_INITIALIZER_CAN_BE_MADE_CONST,
+    pub MISSING_CONST_FOR_THREAD_LOCAL,
     perf,
     "suggest using `const` in `thread_local!` macro"
 }
 
-pub struct ThreadLocalInitializerCanBeMadeConst {
+pub struct MissingConstForThreadLocal {
     msrv: Msrv,
 }
 
-impl ThreadLocalInitializerCanBeMadeConst {
+impl MissingConstForThreadLocal {
     #[must_use]
     pub fn new(msrv: Msrv) -> Self {
         Self { msrv }
     }
 }
 
-impl_lint_pass!(ThreadLocalInitializerCanBeMadeConst => [THREAD_LOCAL_INITIALIZER_CAN_BE_MADE_CONST]);
+impl_lint_pass!(MissingConstForThreadLocal => [MISSING_CONST_FOR_THREAD_LOCAL]);
 
 #[inline]
 fn is_thread_local_initializer(
@@ -102,7 +102,7 @@ fn initializer_can_be_made_const(cx: &LateContext<'_>, defid: rustc_span::def_id
     false
 }
 
-impl<'tcx> LateLintPass<'tcx> for ThreadLocalInitializerCanBeMadeConst {
+impl<'tcx> LateLintPass<'tcx> for MissingConstForThreadLocal {
     fn check_fn(
         &mut self,
         cx: &LateContext<'tcx>,
@@ -113,7 +113,7 @@ impl<'tcx> LateLintPass<'tcx> for ThreadLocalInitializerCanBeMadeConst {
         local_defid: rustc_span::def_id::LocalDefId,
     ) {
         let defid = local_defid.to_def_id();
-        if self.msrv.meets(msrvs::THREAD_LOCAL_INITIALIZER_CAN_BE_MADE_CONST)
+        if self.msrv.meets(msrvs::THREAD_LOCAL_CONST_INIT)
             && is_thread_local_initializer(cx, fn_kind, span).unwrap_or(false)
             // Some implementations of `thread_local!` include an initializer fn.
             // In the case of a const initializer, the init fn is also const,
@@ -139,7 +139,7 @@ impl<'tcx> LateLintPass<'tcx> for ThreadLocalInitializerCanBeMadeConst {
         {
             span_lint_and_sugg(
                 cx,
-                THREAD_LOCAL_INITIALIZER_CAN_BE_MADE_CONST,
+                MISSING_CONST_FOR_THREAD_LOCAL,
                 unpeeled.span,
                 "initializer for `thread_local` value can be made `const`",
                 "replace with",
diff --git a/src/tools/clippy/clippy_lints/src/needless_pass_by_ref_mut.rs b/src/tools/clippy/clippy_lints/src/needless_pass_by_ref_mut.rs
index 57ba0da533190..5ffd41d78e0cb 100644
--- a/src/tools/clippy/clippy_lints/src/needless_pass_by_ref_mut.rs
+++ b/src/tools/clippy/clippy_lints/src/needless_pass_by_ref_mut.rs
@@ -27,7 +27,7 @@ declare_clippy_lint! {
     /// Check if a `&mut` function argument is actually used mutably.
     ///
     /// Be careful if the function is publicly reexported as it would break compatibility with
-    /// users of this function.
+    /// users of this function, when the users pass this function as an argument.
     ///
     /// ### Why is this bad?
     /// Less `mut` means less fights with the borrow checker. It can also lead to more
@@ -138,6 +138,10 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
             return;
         }
 
+        if self.avoid_breaking_exported_api && cx.effective_visibilities.is_exported(fn_def_id) {
+            return;
+        }
+
         let hir_id = cx.tcx.local_def_id_to_hir_id(fn_def_id);
         let is_async = match kind {
             FnKind::ItemFn(.., header) => {
@@ -262,9 +266,6 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
             .iter()
             .filter(|(def_id, _)| !self.used_fn_def_ids.contains(def_id))
         {
-            let show_semver_warning =
-                self.avoid_breaking_exported_api && cx.effective_visibilities.is_exported(*fn_def_id);
-
             let mut is_cfged = None;
             for input in unused {
                 // If the argument is never used mutably, we emit the warning.
@@ -284,7 +285,7 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
                                 format!("&{}", snippet(cx, cx.tcx.hir().span(inner_ty.ty.hir_id), "_"),),
                                 Applicability::Unspecified,
                             );
-                            if show_semver_warning {
+                            if cx.effective_visibilities.is_exported(*fn_def_id) {
                                 diag.warn("changing this function will impact semver compatibility");
                             }
                             if *is_cfged {
diff --git a/src/tools/clippy/clippy_lints/src/no_effect.rs b/src/tools/clippy/clippy_lints/src/no_effect.rs
index 87f886b1128d8..0ecfa7baa72d4 100644
--- a/src/tools/clippy/clippy_lints/src/no_effect.rs
+++ b/src/tools/clippy/clippy_lints/src/no_effect.rs
@@ -1,7 +1,9 @@
 use clippy_utils::diagnostics::{span_lint_hir, span_lint_hir_and_then};
 use clippy_utils::source::snippet_opt;
 use clippy_utils::ty::has_drop;
-use clippy_utils::{any_parent_is_automatically_derived, is_lint_allowed, path_to_local, peel_blocks};
+use clippy_utils::{
+    in_automatically_derived, is_inside_always_const_context, is_lint_allowed, path_to_local, peel_blocks,
+};
 use rustc_errors::Applicability;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{
@@ -185,7 +187,7 @@ impl NoEffect {
                 && has_no_effect(cx, init)
                 && let PatKind::Binding(_, hir_id, ident, _) = local.pat.kind
                 && ident.name.to_ident_string().starts_with('_')
-                && !any_parent_is_automatically_derived(cx.tcx, local.hir_id)
+                && !in_automatically_derived(cx.tcx, local.hir_id)
             {
                 if let Some(l) = self.local_bindings.last_mut() {
                     l.push(hir_id);
@@ -258,13 +260,16 @@ fn has_no_effect(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
 
 fn check_unnecessary_operation(cx: &LateContext<'_>, stmt: &Stmt<'_>) {
     if let StmtKind::Semi(expr) = stmt.kind
+        && !in_external_macro(cx.sess(), stmt.span)
         && let ctxt = stmt.span.ctxt()
         && expr.span.ctxt() == ctxt
         && let Some(reduced) = reduce_expression(cx, expr)
-        && !in_external_macro(cx.sess(), stmt.span)
         && reduced.iter().all(|e| e.span.ctxt() == ctxt)
     {
         if let ExprKind::Index(..) = &expr.kind {
+            if is_inside_always_const_context(cx.tcx, expr.hir_id) {
+                return;
+            }
             let snippet =
                 if let (Some(arr), Some(func)) = (snippet_opt(cx, reduced[0].span), snippet_opt(cx, reduced[1].span)) {
                     format!("assert!({}.len() > {});", &arr, &func)
diff --git a/src/tools/clippy/clippy_lints/src/operators/float_cmp.rs b/src/tools/clippy/clippy_lints/src/operators/float_cmp.rs
index faab79de9d3cc..0e5b440c50f27 100644
--- a/src/tools/clippy/clippy_lints/src/operators/float_cmp.rs
+++ b/src/tools/clippy/clippy_lints/src/operators/float_cmp.rs
@@ -57,7 +57,6 @@ pub(crate) fn check<'tcx>(
                     Applicability::HasPlaceholders, // snippet
                 );
             }
-            diag.note("`f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`");
         });
     }
 }
diff --git a/src/tools/clippy/clippy_lints/src/operators/mod.rs b/src/tools/clippy/clippy_lints/src/operators/mod.rs
index 48a442705b294..59834781a58a5 100644
--- a/src/tools/clippy/clippy_lints/src/operators/mod.rs
+++ b/src/tools/clippy/clippy_lints/src/operators/mod.rs
@@ -242,6 +242,13 @@ declare_clippy_lint! {
     /// # let x = 1;
     /// if (x | 1 > 3) {  }
     /// ```
+    ///
+    /// Use instead:
+    ///
+    /// ```no_run
+    /// # let x = 1;
+    /// if (x >= 2) {  }
+    /// ```
     #[clippy::version = "pre 1.29.0"]
     pub INEFFECTIVE_BIT_MASK,
     correctness,
@@ -265,6 +272,13 @@ declare_clippy_lint! {
     /// # let x = 1;
     /// if x & 0b1111 == 0 { }
     /// ```
+    ///
+    /// Use instead:
+    ///
+    /// ```no_run
+    /// # let x: i32 = 1;
+    /// if x.trailing_zeros() > 4 { }
+    /// ```
     #[clippy::version = "pre 1.29.0"]
     pub VERBOSE_BIT_MASK,
     pedantic,
@@ -560,74 +574,128 @@ declare_clippy_lint! {
     /// implement equality for a type involving floats).
     ///
     /// ### Why is this bad?
-    /// Floating point calculations are usually imprecise, so
-    /// asking if two values are *exactly* equal is asking for trouble. For a good
-    /// guide on what to do, see [the floating point
-    /// guide](http://www.floating-point-gui.de/errors/comparison).
+    /// Floating point calculations are usually imprecise, so asking if two values are *exactly*
+    /// equal is asking for trouble because arriving at the same logical result via different
+    /// routes (e.g. calculation versus constant) may yield different values.
     ///
     /// ### Example
+    ///
     /// ```no_run
-    /// let x = 1.2331f64;
-    /// let y = 1.2332f64;
+    /// let a: f64 = 1000.1;
+    /// let b: f64 = 0.2;
+    /// let x = a + b;
+    /// let y = 1000.3; // Expected value.
     ///
-    /// if y == 1.23f64 { }
-    /// if y != x {} // where both are floats
+    /// // Actual value: 1000.3000000000001
+    /// println!("{x}");
+    ///
+    /// let are_equal = x == y;
+    /// println!("{are_equal}"); // false
     /// ```
     ///
-    /// Use instead:
+    /// The correct way to compare floating point numbers is to define an allowed error margin. This
+    /// may be challenging if there is no "natural" error margin to permit. Broadly speaking, there
+    /// are two cases:
+    ///
+    /// 1. If your values are in a known range and you can define a threshold for "close enough to
+    ///    be equal", it may be appropriate to define an absolute error margin. For example, if your
+    ///    data is "length of vehicle in centimeters", you may consider 0.1 cm to be "close enough".
+    /// 1. If your code is more general and you do not know the range of values, you should use a
+    ///    relative error margin, accepting e.g. 0.1% of error regardless of specific values.
+    ///
+    /// For the scenario where you can define a meaningful absolute error margin, consider using:
+    ///
     /// ```no_run
-    /// # let x = 1.2331f64;
-    /// # let y = 1.2332f64;
-    /// let error_margin = f64::EPSILON; // Use an epsilon for comparison
-    /// // Or, if Rust <= 1.42, use `std::f64::EPSILON` constant instead.
-    /// // let error_margin = std::f64::EPSILON;
-    /// if (y - 1.23f64).abs() < error_margin { }
-    /// if (y - x).abs() > error_margin { }
+    /// let a: f64 = 1000.1;
+    /// let b: f64 = 0.2;
+    /// let x = a + b;
+    /// let y = 1000.3; // Expected value.
+    ///
+    /// const ALLOWED_ERROR_VEHICLE_LENGTH_CM: f64 = 0.1;
+    /// let within_tolerance = (x - y).abs() < ALLOWED_ERROR_VEHICLE_LENGTH_CM;
+    /// println!("{within_tolerance}"); // true
     /// ```
+    ///
+    /// NB! Do not use `f64::EPSILON` - while the error margin is often called "epsilon", this is
+    /// a different use of the term that is not suitable for floating point equality comparison.
+    /// Indeed, for the example above using `f64::EPSILON` as the allowed error would return `false`.
+    ///
+    /// For the scenario where no meaningful absolute error can be defined, refer to
+    /// [the floating point guide](https://www.floating-point-gui.de/errors/comparison)
+    /// for a reference implementation of relative error based comparison of floating point values.
+    /// `MIN_NORMAL` in the reference implementation is equivalent to `MIN_POSITIVE` in Rust.
     #[clippy::version = "pre 1.29.0"]
     pub FLOAT_CMP,
     pedantic,
-    "using `==` or `!=` on float values instead of comparing difference with an epsilon"
+    "using `==` or `!=` on float values instead of comparing difference with an allowed error"
 }
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for (in-)equality comparisons on floating-point
-    /// value and constant, except in functions called `*eq*` (which probably
+    /// Checks for (in-)equality comparisons on constant floating-point
+    /// values (apart from zero), except in functions called `*eq*` (which probably
     /// implement equality for a type involving floats).
     ///
     /// ### Why restrict this?
-    /// Floating point calculations are usually imprecise, so
-    /// asking if two values are *exactly* equal is asking for trouble. For a good
-    /// guide on what to do, see [the floating point
-    /// guide](http://www.floating-point-gui.de/errors/comparison).
+    /// Floating point calculations are usually imprecise, so asking if two values are *exactly*
+    /// equal is asking for trouble because arriving at the same logical result via different
+    /// routes (e.g. calculation versus constant) may yield different values.
     ///
     /// ### Example
+    ///
     /// ```no_run
-    /// let x: f64 = 1.0;
-    /// const ONE: f64 = 1.00;
+    /// let a: f64 = 1000.1;
+    /// let b: f64 = 0.2;
+    /// let x = a + b;
+    /// const Y: f64 = 1000.3; // Expected value.
+    ///
+    /// // Actual value: 1000.3000000000001
+    /// println!("{x}");
     ///
-    /// if x == ONE { } // where both are floats
+    /// let are_equal = x == Y;
+    /// println!("{are_equal}"); // false
     /// ```
     ///
-    /// Use instead:
+    /// The correct way to compare floating point numbers is to define an allowed error margin. This
+    /// may be challenging if there is no "natural" error margin to permit. Broadly speaking, there
+    /// are two cases:
+    ///
+    /// 1. If your values are in a known range and you can define a threshold for "close enough to
+    ///    be equal", it may be appropriate to define an absolute error margin. For example, if your
+    ///    data is "length of vehicle in centimeters", you may consider 0.1 cm to be "close enough".
+    /// 1. If your code is more general and you do not know the range of values, you should use a
+    ///    relative error margin, accepting e.g. 0.1% of error regardless of specific values.
+    ///
+    /// For the scenario where you can define a meaningful absolute error margin, consider using:
+    ///
     /// ```no_run
-    /// # let x: f64 = 1.0;
-    /// # const ONE: f64 = 1.00;
-    /// let error_margin = f64::EPSILON; // Use an epsilon for comparison
-    /// // Or, if Rust <= 1.42, use `std::f64::EPSILON` constant instead.
-    /// // let error_margin = std::f64::EPSILON;
-    /// if (x - ONE).abs() < error_margin { }
+    /// let a: f64 = 1000.1;
+    /// let b: f64 = 0.2;
+    /// let x = a + b;
+    /// const Y: f64 = 1000.3; // Expected value.
+    ///
+    /// const ALLOWED_ERROR_VEHICLE_LENGTH_CM: f64 = 0.1;
+    /// let within_tolerance = (x - Y).abs() < ALLOWED_ERROR_VEHICLE_LENGTH_CM;
+    /// println!("{within_tolerance}"); // true
     /// ```
+    ///
+    /// NB! Do not use `f64::EPSILON` - while the error margin is often called "epsilon", this is
+    /// a different use of the term that is not suitable for floating point equality comparison.
+    /// Indeed, for the example above using `f64::EPSILON` as the allowed error would return `false`.
+    ///
+    /// For the scenario where no meaningful absolute error can be defined, refer to
+    /// [the floating point guide](https://www.floating-point-gui.de/errors/comparison)
+    /// for a reference implementation of relative error based comparison of floating point values.
+    /// `MIN_NORMAL` in the reference implementation is equivalent to `MIN_POSITIVE` in Rust.
     #[clippy::version = "pre 1.29.0"]
     pub FLOAT_CMP_CONST,
     restriction,
-    "using `==` or `!=` on float constants instead of comparing difference with an epsilon"
+    "using `==` or `!=` on float constants instead of comparing difference with an allowed error"
 }
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for getting the remainder of a division by one or minus
+    /// Checks for getting the remainder of integer division by one or minus
     /// one.
     ///
     /// ### Why is this bad?
@@ -646,7 +714,7 @@ declare_clippy_lint! {
     #[clippy::version = "pre 1.29.0"]
     pub MODULO_ONE,
     correctness,
-    "taking a number modulo +/-1, which can either panic/overflow or always returns 0"
+    "taking an integer modulo +/-1, which can either panic/overflow or always returns 0"
 }
 
 declare_clippy_lint! {
diff --git a/src/tools/clippy/clippy_lints/src/overflow_check_conditional.rs b/src/tools/clippy/clippy_lints/src/overflow_check_conditional.rs
deleted file mode 100644
index de78987933108..0000000000000
--- a/src/tools/clippy/clippy_lints/src/overflow_check_conditional.rs
+++ /dev/null
@@ -1,70 +0,0 @@
-use clippy_utils::diagnostics::span_lint;
-use clippy_utils::SpanlessEq;
-use rustc_hir::{BinOpKind, Expr, ExprKind, QPath};
-use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::declare_lint_pass;
-
-declare_clippy_lint! {
-    /// ### What it does
-    /// Detects classic underflow/overflow checks.
-    ///
-    /// ### Why is this bad?
-    /// Most classic C underflow/overflow checks will fail in
-    /// Rust. Users can use functions like `overflowing_*` and `wrapping_*` instead.
-    ///
-    /// ### Example
-    /// ```no_run
-    /// # let a = 1;
-    /// # let b = 2;
-    /// a + b < a;
-    /// ```
-    #[clippy::version = "pre 1.29.0"]
-    pub OVERFLOW_CHECK_CONDITIONAL,
-    complexity,
-    "overflow checks inspired by C which are likely to panic"
-}
-
-declare_lint_pass!(OverflowCheckConditional => [OVERFLOW_CHECK_CONDITIONAL]);
-
-const OVERFLOW_MSG: &str = "you are trying to use classic C overflow conditions that will fail in Rust";
-const UNDERFLOW_MSG: &str = "you are trying to use classic C underflow conditions that will fail in Rust";
-
-impl<'tcx> LateLintPass<'tcx> for OverflowCheckConditional {
-    // a + b < a, a > a + b, a < a - b, a - b > a
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        let eq = |l, r| SpanlessEq::new(cx).eq_path_segment(l, r);
-        if let ExprKind::Binary(ref op, first, second) = expr.kind
-            && let ExprKind::Binary(ref op2, ident1, ident2) = first.kind
-            && let ExprKind::Path(QPath::Resolved(_, path1)) = ident1.kind
-            && let ExprKind::Path(QPath::Resolved(_, path2)) = ident2.kind
-            && let ExprKind::Path(QPath::Resolved(_, path3)) = second.kind
-            && (eq(&path1.segments[0], &path3.segments[0]) || eq(&path2.segments[0], &path3.segments[0]))
-            && cx.typeck_results().expr_ty(ident1).is_integral()
-            && cx.typeck_results().expr_ty(ident2).is_integral()
-        {
-            if op.node == BinOpKind::Lt && op2.node == BinOpKind::Add {
-                span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, OVERFLOW_MSG);
-            }
-            if op.node == BinOpKind::Gt && op2.node == BinOpKind::Sub {
-                span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, UNDERFLOW_MSG);
-            }
-        }
-
-        if let ExprKind::Binary(ref op, first, second) = expr.kind
-            && let ExprKind::Binary(ref op2, ident1, ident2) = second.kind
-            && let ExprKind::Path(QPath::Resolved(_, path1)) = ident1.kind
-            && let ExprKind::Path(QPath::Resolved(_, path2)) = ident2.kind
-            && let ExprKind::Path(QPath::Resolved(_, path3)) = first.kind
-            && (eq(&path1.segments[0], &path3.segments[0]) || eq(&path2.segments[0], &path3.segments[0]))
-            && cx.typeck_results().expr_ty(ident1).is_integral()
-            && cx.typeck_results().expr_ty(ident2).is_integral()
-        {
-            if op.node == BinOpKind::Gt && op2.node == BinOpKind::Add {
-                span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, OVERFLOW_MSG);
-            }
-            if op.node == BinOpKind::Lt && op2.node == BinOpKind::Sub {
-                span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, UNDERFLOW_MSG);
-            }
-        }
-    }
-}
diff --git a/src/tools/clippy/clippy_lints/src/panicking_overflow_checks.rs b/src/tools/clippy/clippy_lints/src/panicking_overflow_checks.rs
new file mode 100644
index 0000000000000..7f100a746d5ed
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/panicking_overflow_checks.rs
@@ -0,0 +1,86 @@
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::eq_expr_value;
+use rustc_hir::{BinOpKind, Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
+use rustc_session::declare_lint_pass;
+
+declare_clippy_lint! {
+    /// ### What it does
+    /// Detects C-style underflow/overflow checks.
+    ///
+    /// ### Why is this bad?
+    /// These checks will, by default, panic in debug builds rather than check
+    /// whether the operation caused an overflow.
+    ///
+    /// ### Example
+    /// ```no_run
+    /// # let a = 1i32;
+    /// # let b = 2i32;
+    /// if a + b < a {
+    ///     // handle overflow
+    /// }
+    /// ```
+    ///
+    /// Use instead:
+    /// ```no_run
+    /// # let a = 1i32;
+    /// # let b = 2i32;
+    /// if a.checked_add(b).is_none() {
+    ///     // handle overflow
+    /// }
+    /// ```
+    ///
+    /// Or:
+    /// ```no_run
+    /// # let a = 1i32;
+    /// # let b = 2i32;
+    /// if a.overflowing_add(b).1 {
+    ///     // handle overflow
+    /// }
+    /// ```
+    #[clippy::version = "pre 1.29.0"]
+    pub PANICKING_OVERFLOW_CHECKS,
+    correctness,
+    "overflow checks which will panic in debug mode"
+}
+
+declare_lint_pass!(PanickingOverflowChecks => [PANICKING_OVERFLOW_CHECKS]);
+
+impl<'tcx> LateLintPass<'tcx> for PanickingOverflowChecks {
+    // a + b < a, a > a + b, a < a - b, a - b > a
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+        if let ExprKind::Binary(op, lhs, rhs) = expr.kind
+            && let (lt, gt) = match op.node {
+                BinOpKind::Lt => (lhs, rhs),
+                BinOpKind::Gt => (rhs, lhs),
+                _ => return,
+            }
+            && let ctxt = expr.span.ctxt()
+            && let (op_lhs, op_rhs, other, commutative) = match (&lt.kind, &gt.kind) {
+                (&ExprKind::Binary(op, lhs, rhs), _) if op.node == BinOpKind::Add && ctxt == lt.span.ctxt() => {
+                    (lhs, rhs, gt, true)
+                },
+                (_, &ExprKind::Binary(op, lhs, rhs)) if op.node == BinOpKind::Sub && ctxt == gt.span.ctxt() => {
+                    (lhs, rhs, lt, false)
+                },
+                _ => return,
+            }
+            && let typeck = cx.typeck_results()
+            && let ty = typeck.expr_ty(op_lhs)
+            && matches!(ty.kind(), ty::Uint(_))
+            && ty == typeck.expr_ty(op_rhs)
+            && ty == typeck.expr_ty(other)
+            && !in_external_macro(cx.tcx.sess, expr.span)
+            && (eq_expr_value(cx, op_lhs, other) || (commutative && eq_expr_value(cx, op_rhs, other)))
+        {
+            span_lint(
+                cx,
+                PANICKING_OVERFLOW_CHECKS,
+                expr.span,
+                "you are trying to use classic C overflow conditions that will fail in Rust",
+            );
+        }
+    }
+}
diff --git a/src/tools/clippy/clippy_lints/src/renamed_lints.rs b/src/tools/clippy/clippy_lints/src/renamed_lints.rs
index 85979903b587a..8e999f3e89af3 100644
--- a/src/tools/clippy/clippy_lints/src/renamed_lints.rs
+++ b/src/tools/clippy/clippy_lints/src/renamed_lints.rs
@@ -26,12 +26,14 @@ pub static RENAMED_LINTS: &[(&str, &str)] = &[
     ("clippy::option_map_unwrap_or", "clippy::map_unwrap_or"),
     ("clippy::option_map_unwrap_or_else", "clippy::map_unwrap_or"),
     ("clippy::option_unwrap_used", "clippy::unwrap_used"),
+    ("clippy::overflow_check_conditional", "clippy::panicking_overflow_checks"),
     ("clippy::ref_in_deref", "clippy::needless_borrow"),
     ("clippy::result_expect_used", "clippy::expect_used"),
     ("clippy::result_map_unwrap_or_else", "clippy::map_unwrap_or"),
     ("clippy::result_unwrap_used", "clippy::unwrap_used"),
     ("clippy::single_char_push_str", "clippy::single_char_add_str"),
     ("clippy::stutter", "clippy::module_name_repetitions"),
+    ("clippy::thread_local_initializer_can_be_made_const", "clippy::missing_const_for_thread_local"),
     ("clippy::to_string_in_display", "clippy::recursive_format_impl"),
     ("clippy::unwrap_or_else_default", "clippy::unwrap_or_default"),
     ("clippy::zero_width_space", "clippy::invisible_characters"),
diff --git a/src/tools/clippy/clippy_lints/src/returns.rs b/src/tools/clippy/clippy_lints/src/returns.rs
index c11da3147ef4a..8ced47b48a43d 100644
--- a/src/tools/clippy/clippy_lints/src/returns.rs
+++ b/src/tools/clippy/clippy_lints/src/returns.rs
@@ -7,6 +7,7 @@ use clippy_utils::{
     path_to_local_id, span_contains_cfg, span_find_starting_semi,
 };
 use core::ops::ControlFlow;
+use rustc_ast::NestedMetaItem;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::LangItem::ResultErr;
@@ -14,13 +15,13 @@ use rustc_hir::{
     Block, Body, Expr, ExprKind, FnDecl, HirId, ItemKind, LangItem, MatchSource, Node, OwnerNode, PatKind, QPath, Stmt,
     StmtKind,
 };
-use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_lint::{LateContext, LateLintPass, Level, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::adjustment::Adjust;
 use rustc_middle::ty::{self, GenericArgKind, Ty};
 use rustc_session::declare_lint_pass;
 use rustc_span::def_id::LocalDefId;
-use rustc_span::{BytePos, Pos, Span};
+use rustc_span::{sym, BytePos, Pos, Span};
 use std::borrow::Cow;
 use std::fmt::Display;
 
@@ -80,6 +81,9 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "pre 1.29.0"]
     pub NEEDLESS_RETURN,
+    // This lint requires some special handling in `check_final_expr` for `#[expect]`.
+    // This handling needs to be updated if the group gets changed. This should also
+    // be caught by tests.
     style,
     "using a return statement like `return expr;` where an expression would suffice"
 }
@@ -91,6 +95,9 @@ declare_clippy_lint! {
     /// ### Why is this bad?
     /// The `return` is unnecessary.
     ///
+    /// Returns may be used to add attributes to the return expression. Return
+    /// statements with attributes are therefore be accepted by this lint.
+    ///
     /// ### Example
     /// ```rust,ignore
     /// fn foo(x: usize) -> Result<(), Box<dyn Error>> {
@@ -377,13 +384,39 @@ fn check_final_expr<'tcx>(
                 }
             };
 
-            if !cx.tcx.hir().attrs(expr.hir_id).is_empty() {
-                return;
-            }
             let borrows = inner.map_or(false, |inner| last_statement_borrows(cx, inner));
             if borrows {
                 return;
             }
+            if ret_span.from_expansion() {
+                return;
+            }
+
+            // Returns may be used to turn an expression into a statement in rustc's AST.
+            // This allows the addition of attributes, like `#[allow]` (See: clippy#9361)
+            // `#[expect(clippy::needless_return)]` needs to be handled separatly to
+            // actually fullfil the expectation (clippy::#12998)
+            match cx.tcx.hir().attrs(expr.hir_id) {
+                [] => {},
+                [attr] => {
+                    if matches!(Level::from_attr(attr), Some(Level::Expect(_)))
+                        && let metas = attr.meta_item_list()
+                        && let Some(lst) = metas
+                        && let [NestedMetaItem::MetaItem(meta_item)] = lst.as_slice()
+                        && let [tool, lint_name] = meta_item.path.segments.as_slice()
+                        && tool.ident.name == sym::clippy
+                        && matches!(
+                            lint_name.ident.name.as_str(),
+                            "needless_return" | "style" | "all" | "warnings"
+                        )
+                    {
+                        // This is an expectation of the `needless_return` lint
+                    } else {
+                        return;
+                    }
+                },
+                _ => return,
+            }
 
             emit_return_lint(cx, ret_span, semi_spans, &replacement, expr.hir_id);
         },
@@ -415,10 +448,6 @@ fn emit_return_lint(
     replacement: &RetReplacement<'_>,
     at: HirId,
 ) {
-    if ret_span.from_expansion() {
-        return;
-    }
-
     span_lint_hir_and_then(
         cx,
         NEEDLESS_RETURN,
diff --git a/src/tools/clippy/clippy_lints/src/same_name_method.rs b/src/tools/clippy/clippy_lints/src/same_name_method.rs
index 8fdd19c549f5a..508f3ae6def02 100644
--- a/src/tools/clippy/clippy_lints/src/same_name_method.rs
+++ b/src/tools/clippy/clippy_lints/src/same_name_method.rs
@@ -12,7 +12,7 @@ use std::collections::{BTreeMap, BTreeSet};
 declare_clippy_lint! {
     /// ### What it does
     /// It lints if a struct has two methods with the same name:
-    /// one from a trait, another not from trait.
+    /// one from a trait, another not from a trait.
     ///
     /// ### Why restrict this?
     /// Confusing.
diff --git a/src/tools/clippy/clippy_lints/src/set_contains_or_insert.rs b/src/tools/clippy/clippy_lints/src/set_contains_or_insert.rs
new file mode 100644
index 0000000000000..5e65b9fa5171d
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/set_contains_or_insert.rs
@@ -0,0 +1,125 @@
+use std::ops::ControlFlow;
+
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::visitors::for_each_expr;
+use clippy_utils::{higher, peel_hir_expr_while, SpanlessEq};
+use rustc_hir::{Expr, ExprKind, UnOp};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::declare_lint_pass;
+use rustc_span::symbol::Symbol;
+use rustc_span::{sym, Span};
+
+declare_clippy_lint! {
+    /// ### What it does
+    /// Checks for usage of `contains` to see if a value is not
+    /// present on `HashSet` followed by a `insert`.
+    ///
+    /// ### Why is this bad?
+    /// Using just `insert` and checking the returned `bool` is more efficient.
+    ///
+    /// ### Known problems
+    /// In case the value that wants to be inserted is borrowed and also expensive or impossible
+    /// to clone. In such a scenario, the developer might want to check with `contains` before inserting,
+    /// to avoid the clone. In this case, it will report a false positive.
+    ///
+    /// ### Example
+    /// ```rust
+    /// use std::collections::HashSet;
+    /// let mut set = HashSet::new();
+    /// let value = 5;
+    /// if !set.contains(&value) {
+    ///     set.insert(value);
+    ///     println!("inserted {value:?}");
+    /// }
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// use std::collections::HashSet;
+    /// let mut set = HashSet::new();
+    /// let value = 5;
+    /// if set.insert(&value) {
+    ///     println!("inserted {value:?}");
+    /// }
+    /// ```
+    #[clippy::version = "1.80.0"]
+    pub SET_CONTAINS_OR_INSERT,
+    nursery,
+    "call to `HashSet::contains` followed by `HashSet::insert`"
+}
+
+declare_lint_pass!(HashsetInsertAfterContains => [SET_CONTAINS_OR_INSERT]);
+
+impl<'tcx> LateLintPass<'tcx> for HashsetInsertAfterContains {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+        if !expr.span.from_expansion()
+            && let Some(higher::If {
+                cond: cond_expr,
+                then: then_expr,
+                ..
+            }) = higher::If::hir(expr)
+            && let Some(contains_expr) = try_parse_op_call(cx, cond_expr, sym!(contains))//try_parse_contains(cx, cond_expr)
+            && let Some(insert_expr) = find_insert_calls(cx, &contains_expr, then_expr)
+        {
+            span_lint(
+                cx,
+                SET_CONTAINS_OR_INSERT,
+                vec![contains_expr.span, insert_expr.span],
+                "usage of `HashSet::insert` after `HashSet::contains`",
+            );
+        }
+    }
+}
+
+struct OpExpr<'tcx> {
+    receiver: &'tcx Expr<'tcx>,
+    value: &'tcx Expr<'tcx>,
+    span: Span,
+}
+
+fn try_parse_op_call<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, symbol: Symbol) -> Option<OpExpr<'tcx>> {
+    let expr = peel_hir_expr_while(expr, |e| {
+        if let ExprKind::Unary(UnOp::Not, e) = e.kind {
+            Some(e)
+        } else {
+            None
+        }
+    });
+
+    if let ExprKind::MethodCall(path, receiver, [value], span) = expr.kind {
+        let value = value.peel_borrows();
+        let value = peel_hir_expr_while(value, |e| {
+            if let ExprKind::Unary(UnOp::Deref, e) = e.kind {
+                Some(e)
+            } else {
+                None
+            }
+        });
+        let receiver = receiver.peel_borrows();
+        let receiver_ty = cx.typeck_results().expr_ty(receiver).peel_refs();
+        if value.span.eq_ctxt(expr.span)
+            && is_type_diagnostic_item(cx, receiver_ty, sym::HashSet)
+            && path.ident.name == symbol
+        {
+            return Some(OpExpr { receiver, value, span });
+        }
+    }
+    None
+}
+
+fn find_insert_calls<'tcx>(
+    cx: &LateContext<'tcx>,
+    contains_expr: &OpExpr<'tcx>,
+    expr: &'tcx Expr<'_>,
+) -> Option<OpExpr<'tcx>> {
+    for_each_expr(cx, expr, |e| {
+        if let Some(insert_expr) = try_parse_op_call(cx, e, sym!(insert))
+            && SpanlessEq::new(cx).eq_expr(contains_expr.receiver, insert_expr.receiver)
+            && SpanlessEq::new(cx).eq_expr(contains_expr.value, insert_expr.value)
+        {
+            ControlFlow::Break(insert_expr)
+        } else {
+            ControlFlow::Continue(())
+        }
+    })
+}
diff --git a/src/tools/clippy/clippy_lints/src/unconditional_recursion.rs b/src/tools/clippy/clippy_lints/src/unconditional_recursion.rs
index 5e41b3f4914ff..6ba98a92423c7 100644
--- a/src/tools/clippy/clippy_lints/src/unconditional_recursion.rs
+++ b/src/tools/clippy/clippy_lints/src/unconditional_recursion.rs
@@ -15,7 +15,7 @@ use rustc_middle::ty::{self, AssocKind, Ty, TyCtxt};
 use rustc_session::impl_lint_pass;
 use rustc_span::symbol::{kw, Ident};
 use rustc_span::{sym, Span};
-use rustc_trait_selection::traits::error_reporting::suggestions::ReturnsVisitor;
+use rustc_trait_selection::error_reporting::traits::suggestions::ReturnsVisitor;
 
 declare_clippy_lint! {
     /// ### What it does
diff --git a/src/tools/clippy/clippy_lints/src/utils/internal_lints.rs b/src/tools/clippy/clippy_lints/src/utils/internal_lints.rs
index 877a77fd6d242..1d294c2944b2c 100644
--- a/src/tools/clippy/clippy_lints/src/utils/internal_lints.rs
+++ b/src/tools/clippy/clippy_lints/src/utils/internal_lints.rs
@@ -1,6 +1,5 @@
 pub mod almost_standard_lint_formulation;
 pub mod collapsible_calls;
-pub mod compiler_lint_functions;
 pub mod interning_defined_symbol;
 pub mod invalid_paths;
 pub mod lint_without_lint_pass;
diff --git a/src/tools/clippy/clippy_lints/src/utils/internal_lints/compiler_lint_functions.rs b/src/tools/clippy/clippy_lints/src/utils/internal_lints/compiler_lint_functions.rs
deleted file mode 100644
index 9b6b687181867..0000000000000
--- a/src/tools/clippy/clippy_lints/src/utils/internal_lints/compiler_lint_functions.rs
+++ /dev/null
@@ -1,73 +0,0 @@
-use clippy_utils::diagnostics::span_lint_and_help;
-use clippy_utils::ty::match_type;
-use clippy_utils::{is_lint_allowed, paths};
-use rustc_data_structures::fx::FxHashMap;
-use rustc_hir::{Expr, ExprKind};
-use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::impl_lint_pass;
-
-declare_clippy_lint! {
-    /// ### What it does
-    /// Checks for calls to `cx.span_lint*` and suggests to use the `utils::*`
-    /// variant of the function.
-    ///
-    /// ### Why is this bad?
-    /// The `utils::*` variants also add a link to the Clippy documentation to the
-    /// warning/error messages.
-    ///
-    /// ### Example
-    /// ```rust,ignore
-    /// cx.span_lint(LINT_NAME, "message");
-    /// ```
-    ///
-    /// Use instead:
-    /// ```rust,ignore
-    /// utils::span_lint(cx, LINT_NAME, "message");
-    /// ```
-    pub COMPILER_LINT_FUNCTIONS,
-    internal,
-    "usage of the lint functions of the compiler instead of the utils::* variant"
-}
-
-impl_lint_pass!(CompilerLintFunctions => [COMPILER_LINT_FUNCTIONS]);
-
-#[derive(Clone, Default)]
-pub struct CompilerLintFunctions {
-    map: FxHashMap<&'static str, &'static str>,
-}
-
-impl CompilerLintFunctions {
-    #[must_use]
-    pub fn new() -> Self {
-        let mut map = FxHashMap::default();
-        map.insert("span_lint", "utils::span_lint");
-        map.insert("lint", "utils::span_lint");
-        map.insert("span_lint_note", "utils::span_lint_and_note");
-        map.insert("span_lint_help", "utils::span_lint_and_help");
-        Self { map }
-    }
-}
-
-impl<'tcx> LateLintPass<'tcx> for CompilerLintFunctions {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
-        if is_lint_allowed(cx, COMPILER_LINT_FUNCTIONS, expr.hir_id) {
-            return;
-        }
-
-        if let ExprKind::MethodCall(path, self_arg, _, _) = &expr.kind
-            && let fn_name = path.ident
-            && let Some(sugg) = self.map.get(fn_name.as_str())
-            && let ty = cx.typeck_results().expr_ty(self_arg).peel_refs()
-            && (match_type(cx, ty, &paths::EARLY_CONTEXT) || match_type(cx, ty, &paths::LATE_CONTEXT))
-        {
-            span_lint_and_help(
-                cx,
-                COMPILER_LINT_FUNCTIONS,
-                path.ident.span,
-                "usage of a compiler lint function",
-                None,
-                format!("please use the Clippy variant of this function: `{sugg}`"),
-            );
-        }
-    }
-}
diff --git a/src/tools/clippy/clippy_lints/src/wildcard_imports.rs b/src/tools/clippy/clippy_lints/src/wildcard_imports.rs
index 436f0cb79fb26..a0a60ca887583 100644
--- a/src/tools/clippy/clippy_lints/src/wildcard_imports.rs
+++ b/src/tools/clippy/clippy_lints/src/wildcard_imports.rs
@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::is_test_module_or_function;
+use clippy_utils::is_in_test;
 use clippy_utils::source::{snippet, snippet_with_applicability};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
@@ -100,7 +100,6 @@ declare_clippy_lint! {
 #[derive(Default)]
 pub struct WildcardImports {
     warn_on_all: bool,
-    test_modules_deep: u32,
     allowed_segments: FxHashSet<String>,
 }
 
@@ -108,7 +107,6 @@ impl WildcardImports {
     pub fn new(warn_on_all: bool, allowed_wildcard_imports: FxHashSet<String>) -> Self {
         Self {
             warn_on_all,
-            test_modules_deep: 0,
             allowed_segments: allowed_wildcard_imports,
         }
     }
@@ -122,15 +120,12 @@ impl LateLintPass<'_> for WildcardImports {
             return;
         }
 
-        if is_test_module_or_function(cx.tcx, item) {
-            self.test_modules_deep = self.test_modules_deep.saturating_add(1);
-        }
         let module = cx.tcx.parent_module_from_def_id(item.owner_id.def_id);
         if cx.tcx.visibility(item.owner_id.def_id) != ty::Visibility::Restricted(module.to_def_id()) {
             return;
         }
         if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind
-            && (self.warn_on_all || !self.check_exceptions(item, use_path.segments))
+            && (self.warn_on_all || !self.check_exceptions(cx, item, use_path.segments))
             && let used_imports = cx.tcx.names_imported_by_glob_use(item.owner_id.def_id)
             && !used_imports.is_empty() // Already handled by `unused_imports`
             && !used_imports.contains(&kw::Underscore)
@@ -180,20 +175,14 @@ impl LateLintPass<'_> for WildcardImports {
             span_lint_and_sugg(cx, lint, span, message, "try", sugg, applicability);
         }
     }
-
-    fn check_item_post(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
-        if is_test_module_or_function(cx.tcx, item) {
-            self.test_modules_deep = self.test_modules_deep.saturating_sub(1);
-        }
-    }
 }
 
 impl WildcardImports {
-    fn check_exceptions(&self, item: &Item<'_>, segments: &[PathSegment<'_>]) -> bool {
+    fn check_exceptions(&self, cx: &LateContext<'_>, item: &Item<'_>, segments: &[PathSegment<'_>]) -> bool {
         item.span.from_expansion()
             || is_prelude_import(segments)
-            || (is_super_only_import(segments) && self.test_modules_deep > 0)
             || is_allowed_via_config(segments, &self.allowed_segments)
+            || (is_super_only_import(segments) && is_in_test(cx.tcx, item.hir_id()))
     }
 }
 
diff --git a/src/tools/clippy/clippy_lints/src/write.rs b/src/tools/clippy/clippy_lints/src/write.rs
index 652ce88bd9516..96e53b7ef0ba7 100644
--- a/src/tools/clippy/clippy_lints/src/write.rs
+++ b/src/tools/clippy/clippy_lints/src/write.rs
@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
+use clippy_utils::is_in_test;
 use clippy_utils::macros::{format_arg_removal_span, root_macro_call_first_node, FormatArgsStorage, MacroCall};
 use clippy_utils::source::{expand_past_previous_comma, snippet_opt};
-use clippy_utils::{is_in_cfg_test, is_in_test_function};
 use rustc_ast::token::LitKind;
 use rustc_ast::{
     FormatArgPosition, FormatArgPositionKind, FormatArgs, FormatArgsPiece, FormatOptions, FormatPlaceholder,
@@ -297,8 +297,7 @@ impl<'tcx> LateLintPass<'tcx> for Write {
             .as_ref()
             .map_or(false, |crate_name| crate_name == "build_script_build");
 
-        let allowed_in_tests = self.allow_print_in_tests
-            && (is_in_test_function(cx.tcx, expr.hir_id) || is_in_cfg_test(cx.tcx, expr.hir_id));
+        let allowed_in_tests = self.allow_print_in_tests && is_in_test(cx.tcx, expr.hir_id);
         match diag_name {
             sym::print_macro | sym::println_macro if !allowed_in_tests => {
                 if !is_build_script {
diff --git a/src/tools/clippy/clippy_utils/src/lib.rs b/src/tools/clippy/clippy_utils/src/lib.rs
index 935a25d79319d..bdb3b5e45c48d 100644
--- a/src/tools/clippy/clippy_utils/src/lib.rs
+++ b/src/tools/clippy/clippy_utils/src/lib.rs
@@ -102,10 +102,11 @@ use rustc_hir::hir_id::{HirIdMap, HirIdSet};
 use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
 use rustc_hir::LangItem::{OptionNone, OptionSome, ResultErr, ResultOk};
 use rustc_hir::{
-    self as hir, def, Arm, ArrayLen, BindingMode, Block, BlockCheckMode, Body, ByRef, Closure, Destination, Expr,
-    ExprField, ExprKind, FnDecl, FnRetTy, GenericArgs, HirId, Impl, ImplItem, ImplItemKind, ImplItemRef, Item,
-    ItemKind, LangItem, LetStmt, MatchSource, Mutability, Node, OwnerId, Param, Pat, PatKind, Path, PathSegment,
-    PrimTy, QPath, Stmt, StmtKind, TraitItem, TraitItemKind, TraitItemRef, TraitRef, TyKind, UnOp,
+    self as hir, def, Arm, ArrayLen, BindingMode, Block, BlockCheckMode, Body, ByRef, Closure, ConstContext,
+    Destination, Expr, ExprField, ExprKind, FnDecl, FnRetTy, GenericArgs, HirId, Impl, ImplItem, ImplItemKind,
+    ImplItemRef, Item, ItemKind, LangItem, LetStmt, MatchSource, Mutability, Node, OwnerId, OwnerNode, Param, Pat,
+    PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind, TraitItem, TraitItemKind, TraitItemRef, TraitRef,
+    TyKind, UnOp,
 };
 use rustc_lexer::{tokenize, TokenKind};
 use rustc_lint::{LateContext, Level, Lint, LintContext};
@@ -210,7 +211,10 @@ pub fn local_is_initialized(cx: &LateContext<'_>, local: HirId) -> bool {
     false
 }
 
-/// Returns `true` if the given `NodeId` is inside a constant context
+/// Returns `true` if the given `HirId` is inside a constant context.
+///
+/// This is the same as `is_inside_always_const_context`, but also includes
+/// `const fn`.
 ///
 /// # Example
 ///
@@ -223,6 +227,24 @@ pub fn in_constant(cx: &LateContext<'_>, id: HirId) -> bool {
     cx.tcx.hir().is_inside_const_context(id)
 }
 
+/// Returns `true` if the given `HirId` is inside an always constant context.
+///
+/// This context includes:
+///  * const/static items
+///  * const blocks (or inline consts)
+///  * associated constants
+pub fn is_inside_always_const_context(tcx: TyCtxt<'_>, hir_id: HirId) -> bool {
+    use ConstContext::{Const, ConstFn, Static};
+    let hir = tcx.hir();
+    let Some(ctx) = hir.body_const_context(hir.enclosing_body_owner(hir_id)) else {
+        return false;
+    };
+    match ctx {
+        ConstFn => false,
+        Static(_) | Const { inline: _ } => true,
+    }
+}
+
 /// Checks if a `Res` refers to a constructor of a `LangItem`
 /// For example, use this to check whether a function call or a pattern is `Some(..)`.
 pub fn is_res_lang_ctor(cx: &LateContext<'_>, res: Res, lang_item: LangItem) -> bool {
@@ -1904,8 +1926,18 @@ pub fn any_parent_has_attr(tcx: TyCtxt<'_>, node: HirId, symbol: Symbol) -> bool
     false
 }
 
-pub fn any_parent_is_automatically_derived(tcx: TyCtxt<'_>, node: HirId) -> bool {
-    any_parent_has_attr(tcx, node, sym::automatically_derived)
+/// Checks if the given HIR node is inside an `impl` block with the `automatically_derived`
+/// attribute.
+pub fn in_automatically_derived(tcx: TyCtxt<'_>, id: HirId) -> bool {
+    tcx.hir()
+        .parent_owner_iter(id)
+        .filter(|(_, node)| matches!(node, OwnerNode::Item(item) if matches!(item.kind, ItemKind::Impl(_))))
+        .any(|(id, _)| {
+            has_attr(
+                tcx.hir().attrs(tcx.local_def_id_to_hir_id(id.def_id)),
+                sym::automatically_derived,
+            )
+        })
 }
 
 /// Matches a function call with the given path and returns the arguments.
@@ -2472,6 +2504,17 @@ pub fn peel_hir_ty_refs<'a>(mut ty: &'a hir::Ty<'a>) -> (&'a hir::Ty<'a>, usize)
     }
 }
 
+/// Peels off all references on the type. Returns the underlying type and the number of references
+/// removed.
+pub fn peel_middle_ty_refs(mut ty: Ty<'_>) -> (Ty<'_>, usize) {
+    let mut count = 0;
+    while let rustc_ty::Ref(_, dest_ty, _) = ty.kind() {
+        ty = *dest_ty;
+        count += 1;
+    }
+    (ty, count)
+}
+
 /// Removes `AddrOf` operators (`&`) or deref operators (`*`), but only if a reference type is
 /// dereferenced. An overloaded deref such as `Vec` to slice would not be removed.
 pub fn peel_ref_operators<'hir>(cx: &LateContext<'_>, mut expr: &'hir Expr<'hir>) -> &'hir Expr<'hir> {
@@ -2594,16 +2637,6 @@ pub fn inherits_cfg(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
             .any(|attr| attr.has_name(sym::cfg))
 }
 
-/// Checks whether item either has `test` attribute applied, or
-/// is a module with `test` in its name.
-///
-/// Note: Add `//@compile-flags: --test` to UI tests with a `#[test]` function
-pub fn is_test_module_or_function(tcx: TyCtxt<'_>, item: &Item<'_>) -> bool {
-    is_in_test_function(tcx, item.hir_id())
-        || matches!(item.kind, ItemKind::Mod(..))
-            && item.ident.name.as_str().split('_').any(|a| a == "test" || a == "tests")
-}
-
 /// Walks up the HIR tree from the given expression in an attempt to find where the value is
 /// consumed.
 ///
diff --git a/src/tools/clippy/clippy_utils/src/paths.rs b/src/tools/clippy/clippy_utils/src/paths.rs
index 3f66813801dc0..d5a3d8b9e5a2e 100644
--- a/src/tools/clippy/clippy_utils/src/paths.rs
+++ b/src/tools/clippy/clippy_utils/src/paths.rs
@@ -88,6 +88,7 @@ pub const SYMBOL_INTERN: [&str; 4] = ["rustc_span", "symbol", "Symbol", "intern"
 pub const SYMBOL_TO_IDENT_STRING: [&str; 4] = ["rustc_span", "symbol", "Symbol", "to_ident_string"];
 pub const SYM_MODULE: [&str; 3] = ["rustc_span", "symbol", "sym"];
 pub const SYNTAX_CONTEXT: [&str; 3] = ["rustc_span", "hygiene", "SyntaxContext"];
+pub const STRING_FROM_UTF8: [&str; 4] = ["alloc", "string", "String", "from_utf8"];
 #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
 pub const TOKIO_FILE_OPTIONS: [&str; 5] = ["tokio", "fs", "file", "File", "options"];
 #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
diff --git a/src/tools/clippy/clippy_utils/src/ty.rs b/src/tools/clippy/clippy_utils/src/ty.rs
index acaeb93f44a6e..fc02b974ee12a 100644
--- a/src/tools/clippy/clippy_utils/src/ty.rs
+++ b/src/tools/clippy/clippy_utils/src/ty.rs
@@ -96,11 +96,7 @@ pub fn contains_ty_adt_constructor_opaque<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'
                         return false;
                     }
 
-                    for (predicate, _span) in cx
-                        .tcx
-                        .explicit_item_super_predicates(def_id)
-                        .iter_identity_copied()
-                    {
+                    for (predicate, _span) in cx.tcx.explicit_item_super_predicates(def_id).iter_identity_copied() {
                         match predicate.kind().skip_binder() {
                             // For `impl Trait<U>`, it will register a predicate of `T: Trait<U>`, so we go through
                             // and check substitutions to find `U`.
@@ -1332,19 +1328,13 @@ pub fn deref_chain<'cx, 'tcx>(cx: &'cx LateContext<'tcx>, ty: Ty<'tcx>) -> impl
 /// If you need this, you should wrap this call in `clippy_utils::ty::deref_chain().any(...)`.
 pub fn get_adt_inherent_method<'a>(cx: &'a LateContext<'_>, ty: Ty<'_>, method_name: Symbol) -> Option<&'a AssocItem> {
     if let Some(ty_did) = ty.ty_adt_def().map(AdtDef::did) {
-        cx.tcx
-            .inherent_impls(ty_did)
-            .into_iter()
-            .flatten()
-            .map(|&did| {
-                cx.tcx
-                    .associated_items(did)
-                    .filter_by_name_unhygienic(method_name)
-                    .next()
-                    .filter(|item| item.kind == AssocKind::Fn)
-            })
-            .next()
-            .flatten()
+        cx.tcx.inherent_impls(ty_did).into_iter().flatten().find_map(|&did| {
+            cx.tcx
+                .associated_items(did)
+                .filter_by_name_unhygienic(method_name)
+                .next()
+                .filter(|item| item.kind == AssocKind::Fn)
+        })
     } else {
         None
     }
diff --git a/src/tools/clippy/lintcheck/Cargo.toml b/src/tools/clippy/lintcheck/Cargo.toml
index ae9e77b8eed05..3c86dfe324f4d 100644
--- a/src/tools/clippy/lintcheck/Cargo.toml
+++ b/src/tools/clippy/lintcheck/Cargo.toml
@@ -16,6 +16,7 @@ clap = { version = "4.4", features = ["derive", "env"] }
 crossbeam-channel = "0.5.6"
 diff = "0.1.13"
 flate2 = "1.0"
+itertools = "0.12"
 rayon = "1.5.1"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.85"
diff --git a/src/tools/clippy/lintcheck/README.md b/src/tools/clippy/lintcheck/README.md
index 2d6039caeef07..47a96e0a03c9c 100644
--- a/src/tools/clippy/lintcheck/README.md
+++ b/src/tools/clippy/lintcheck/README.md
@@ -7,13 +7,13 @@ repo.  We can then check the diff and spot new or disappearing warnings.
 From the repo root, run:
 
 ```
-cargo run --target-dir lintcheck/target --manifest-path lintcheck/Cargo.toml
+cargo lintcheck
 ```
 
 or
 
 ```
-cargo lintcheck
+cargo run --target-dir lintcheck/target --manifest-path lintcheck/Cargo.toml
 ```
 
 By default, the logs will be saved into
@@ -33,6 +33,8 @@ the 200 recently most downloaded crates:
 cargo lintcheck popular -n 200 custom.toml
 ```
 
+> Note: Lintcheck isn't sandboxed. Only use it to check crates that you trust or
+> sandbox it manually.
 
 ### Configuring the Crate Sources
 
@@ -65,17 +67,11 @@ sources.
 #### Command Line Options (optional)
 
 ```toml
-bitflags = {name = "bitflags", versions = ['1.2.1'], options = ['-Wclippy::pedantic', '-Wclippy::cargo']}
+clap = {name = "clap", versions = ['4.5.8'], options = ['-Fderive']}
 ```
 
 It is possible to specify command line options for each crate. This makes it
-possible to only check a crate for certain lint groups. If no options are
-specified, the lint groups `clippy::all`, `clippy::pedantic`, and
-`clippy::cargo` are checked. If an empty array is specified only `clippy::all`
-is checked.
-
-**Note:** `-Wclippy::all` is always enabled by default, unless `-Aclippy::all`
-is explicitly specified in the options.
+possible to enable or disable features.
 
 ### Fix mode
 You can run `cargo lintcheck --fix` which will run Clippy with `--fix` and
diff --git a/src/tools/clippy/lintcheck/lintcheck_crates.toml b/src/tools/clippy/lintcheck/lintcheck_crates.toml
index 52f7fee47b616..ff608e6f93592 100644
--- a/src/tools/clippy/lintcheck/lintcheck_crates.toml
+++ b/src/tools/clippy/lintcheck/lintcheck_crates.toml
@@ -1,38 +1,38 @@
 [crates]
 # some of these are from cargotest
-cargo = {name = "cargo", versions = ['0.64.0']}
-iron = {name = "iron", versions = ['0.6.1']}
-ripgrep = {name = "ripgrep", versions = ['12.1.1']}
-xsv = {name = "xsv", versions = ['0.13.0']}
+cargo = {name = "cargo", version = '0.64.0'}
+iron = {name = "iron", version = '0.6.1'}
+ripgrep = {name = "ripgrep", version = '12.1.1'}
+xsv = {name = "xsv", version = '0.13.0'}
 # commented out because of 173K clippy::match_same_arms msgs in language_type.rs
-#tokei = { name = "tokei", versions = ['12.0.4']}
-rayon = {name = "rayon", versions = ['1.5.0']}
-serde = {name = "serde", versions = ['1.0.118']}
+#tokei = { name = "tokei", version = '12.0.4'}
+rayon = {name = "rayon", version = '1.5.0'}
+serde = {name = "serde", version = '1.0.118'}
 # top 10 crates.io dls
-bitflags = {name = "bitflags", versions = ['1.2.1']}
+bitflags = {name = "bitflags", version = '1.2.1'}
 # crash = {name = "clippy_crash", path = "/tmp/clippy_crash"}
-libc = {name = "libc", versions = ['0.2.81']}
-log = {name = "log", versions = ['0.4.11']}
-proc-macro2 = {name = "proc-macro2", versions = ['1.0.24']}
-quote = {name = "quote", versions = ['1.0.7']}
-rand = {name = "rand", versions = ['0.7.3']}
-rand_core = {name = "rand_core", versions = ['0.6.0']}
-regex = {name = "regex", versions = ['1.3.2']}
-syn = {name = "syn", versions = ['1.0.54']}
-unicode-xid = {name = "unicode-xid", versions = ['0.2.1']}
+libc = {name = "libc", version = '0.2.81'}
+log = {name = "log", version = '0.4.11'}
+proc-macro2 = {name = "proc-macro2", version = '1.0.24'}
+quote = {name = "quote", version = '1.0.7'}
+rand = {name = "rand", version = '0.7.3'}
+rand_core = {name = "rand_core", version = '0.6.0'}
+regex = {name = "regex", version = '1.3.2'}
+syn = {name = "syn", version = '1.0.54'}
+unicode-xid = {name = "unicode-xid", version = '0.2.1'}
 # some more of dtolnays crates
-anyhow = {name = "anyhow", versions = ['1.0.38']}
-async-trait = {name = "async-trait", versions = ['0.1.42']}
-cxx = {name = "cxx", versions = ['1.0.32']}
-ryu = {name = "ryu", versions = ['1.0.5']}
-serde_yaml = {name = "serde_yaml", versions = ['0.8.17']}
-thiserror = {name = "thiserror", versions = ['1.0.24']}
+anyhow = {name = "anyhow", version = '1.0.38'}
+async-trait = {name = "async-trait", version = '0.1.42'}
+cxx = {name = "cxx", version = '1.0.32'}
+ryu = {name = "ryu", version = '1.0.5'}
+serde_yaml = {name = "serde_yaml", version = '0.8.17'}
+thiserror = {name = "thiserror", version = '1.0.24'}
 # some embark crates, there are other interesting crates but
 # unfortunately adding them increases lintcheck runtime drastically
-cfg-expr = {name = "cfg-expr", versions = ['0.7.1']}
+cfg-expr = {name = "cfg-expr", version = '0.7.1'}
 puffin = {name = "puffin", git_url = "https://github.com/EmbarkStudios/puffin", git_hash = "02dd4a3"}
-rpmalloc = {name = "rpmalloc", versions = ['0.2.0']}
-tame-oidc = {name = "tame-oidc", versions = ['0.1.0']}
+rpmalloc = {name = "rpmalloc", version = '0.2.0'}
+tame-oidc = {name = "tame-oidc", version = '0.1.0'}
 
 [recursive]
 ignore = [
diff --git a/src/tools/clippy/lintcheck/src/config.rs b/src/tools/clippy/lintcheck/src/config.rs
index e6cd7c9fdc2bf..b35a62eed4405 100644
--- a/src/tools/clippy/lintcheck/src/config.rs
+++ b/src/tools/clippy/lintcheck/src/config.rs
@@ -36,6 +36,10 @@ pub(crate) struct LintcheckConfig {
     /// Apply a filter to only collect specified lints, this also overrides `allow` attributes
     #[clap(long = "filter", value_name = "clippy_lint_name", use_value_delimiter = true)]
     pub lint_filter: Vec<String>,
+    /// Set all lints to the "warn" lint level, even resitriction ones. Usually,
+    /// it's better to use `--filter` instead
+    #[clap(long, conflicts_with("lint_filter"))]
+    pub warn_all: bool,
     /// Set the output format of the log file
     #[clap(long, short, default_value = "text")]
     pub format: OutputFormat,
diff --git a/src/tools/clippy/lintcheck/src/driver.rs b/src/tools/clippy/lintcheck/src/driver.rs
index 47724a2fedb00..041be5081f28c 100644
--- a/src/tools/clippy/lintcheck/src/driver.rs
+++ b/src/tools/clippy/lintcheck/src/driver.rs
@@ -11,8 +11,6 @@ use std::{env, mem};
 fn run_clippy(addr: &str) -> Option<i32> {
     let driver_info = DriverInfo {
         package_name: env::var("CARGO_PKG_NAME").ok()?,
-        crate_name: env::var("CARGO_CRATE_NAME").ok()?,
-        version: env::var("CARGO_PKG_VERSION").ok()?,
     };
 
     let mut stream = BufReader::new(TcpStream::connect(addr).unwrap());
diff --git a/src/tools/clippy/lintcheck/src/input.rs b/src/tools/clippy/lintcheck/src/input.rs
new file mode 100644
index 0000000000000..3d034391c280f
--- /dev/null
+++ b/src/tools/clippy/lintcheck/src/input.rs
@@ -0,0 +1,288 @@
+use std::collections::{HashMap, HashSet};
+use std::fs::{self};
+use std::io::{self, ErrorKind};
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use std::time::Duration;
+
+use serde::Deserialize;
+use walkdir::{DirEntry, WalkDir};
+
+use crate::{Crate, LINTCHECK_DOWNLOADS, LINTCHECK_SOURCES};
+
+/// List of sources to check, loaded from a .toml file
+#[derive(Debug, Deserialize)]
+pub struct SourceList {
+    crates: HashMap<String, TomlCrate>,
+    #[serde(default)]
+    recursive: RecursiveOptions,
+}
+
+#[derive(Debug, Deserialize, Default)]
+pub struct RecursiveOptions {
+    pub ignore: HashSet<String>,
+}
+
+/// A crate source stored inside the .toml
+/// will be translated into on one of the `CrateSource` variants
+#[derive(Debug, Deserialize)]
+struct TomlCrate {
+    name: String,
+    version: Option<String>,
+    git_url: Option<String>,
+    git_hash: Option<String>,
+    path: Option<String>,
+    options: Option<Vec<String>>,
+}
+
+/// Represents an archive we download from crates.io, or a git repo, or a local repo/folder
+/// Once processed (downloaded/extracted/cloned/copied...), this will be translated into a `Crate`
+#[derive(Debug, Deserialize, Eq, Hash, PartialEq, Ord, PartialOrd)]
+pub enum CrateSource {
+    CratesIo {
+        name: String,
+        version: String,
+        options: Option<Vec<String>>,
+    },
+    Git {
+        name: String,
+        url: String,
+        commit: String,
+        options: Option<Vec<String>>,
+    },
+    Path {
+        name: String,
+        path: PathBuf,
+        options: Option<Vec<String>>,
+    },
+}
+
+/// Read a `lintcheck_crates.toml` file
+pub fn read_crates(toml_path: &Path) -> (Vec<CrateSource>, RecursiveOptions) {
+    let toml_content: String =
+        fs::read_to_string(toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
+    let crate_list: SourceList =
+        toml::from_str(&toml_content).unwrap_or_else(|e| panic!("Failed to parse {}: \n{e}", toml_path.display()));
+    // parse the hashmap of the toml file into a list of crates
+    let tomlcrates: Vec<TomlCrate> = crate_list.crates.into_values().collect();
+
+    // flatten TomlCrates into CrateSources (one TomlCrates may represent several versions of a crate =>
+    // multiple Cratesources)
+    let mut crate_sources = Vec::new();
+    for tk in tomlcrates {
+        if let Some(ref path) = tk.path {
+            crate_sources.push(CrateSource::Path {
+                name: tk.name.clone(),
+                path: PathBuf::from(path),
+                options: tk.options.clone(),
+            });
+        } else if let Some(ref version) = tk.version {
+            crate_sources.push(CrateSource::CratesIo {
+                name: tk.name.clone(),
+                version: version.to_string(),
+                options: tk.options.clone(),
+            });
+        } else if tk.git_url.is_some() && tk.git_hash.is_some() {
+            // otherwise, we should have a git source
+            crate_sources.push(CrateSource::Git {
+                name: tk.name.clone(),
+                url: tk.git_url.clone().unwrap(),
+                commit: tk.git_hash.clone().unwrap(),
+                options: tk.options.clone(),
+            });
+        } else {
+            panic!("Invalid crate source: {tk:?}");
+        }
+
+        // if we have a version as well as a git data OR only one git data, something is funky
+        if tk.version.is_some() && (tk.git_url.is_some() || tk.git_hash.is_some())
+            || tk.git_hash.is_some() != tk.git_url.is_some()
+        {
+            eprintln!("tomlkrate: {tk:?}");
+            assert_eq!(
+                tk.git_hash.is_some(),
+                tk.git_url.is_some(),
+                "Error: Encountered TomlCrate with only one of git_hash and git_url!"
+            );
+            assert!(
+                tk.path.is_none() || (tk.git_hash.is_none() && tk.version.is_none()),
+                "Error: TomlCrate can only have one of 'git_.*', 'version' or 'path' fields"
+            );
+            unreachable!("Failed to translate TomlCrate into CrateSource!");
+        }
+    }
+    // sort the crates
+    crate_sources.sort();
+
+    (crate_sources, crate_list.recursive)
+}
+
+impl CrateSource {
+    /// Makes the sources available on the disk for clippy to check.
+    /// Clones a git repo and checks out the specified commit or downloads a crate from crates.io or
+    /// copies a local folder
+    #[expect(clippy::too_many_lines)]
+    pub fn download_and_extract(&self) -> Crate {
+        #[allow(clippy::result_large_err)]
+        fn get(path: &str) -> Result<ureq::Response, ureq::Error> {
+            const MAX_RETRIES: u8 = 4;
+            let mut retries = 0;
+            loop {
+                match ureq::get(path).call() {
+                    Ok(res) => return Ok(res),
+                    Err(e) if retries >= MAX_RETRIES => return Err(e),
+                    Err(ureq::Error::Transport(e)) => eprintln!("Error: {e}"),
+                    Err(e) => return Err(e),
+                }
+                eprintln!("retrying in {retries} seconds...");
+                std::thread::sleep(Duration::from_secs(u64::from(retries)));
+                retries += 1;
+            }
+        }
+        match self {
+            CrateSource::CratesIo { name, version, options } => {
+                let extract_dir = PathBuf::from(LINTCHECK_SOURCES);
+                let krate_download_dir = PathBuf::from(LINTCHECK_DOWNLOADS);
+
+                // url to download the crate from crates.io
+                let url = format!("https://crates.io/api/v1/crates/{name}/{version}/download");
+                println!("Downloading and extracting {name} {version} from {url}");
+                create_dirs(&krate_download_dir, &extract_dir);
+
+                let krate_file_path = krate_download_dir.join(format!("{name}-{version}.crate.tar.gz"));
+                // don't download/extract if we already have done so
+                if !krate_file_path.is_file() {
+                    // create a file path to download and write the crate data into
+                    let mut krate_dest = fs::File::create(&krate_file_path).unwrap();
+                    let mut krate_req = get(&url).unwrap().into_reader();
+                    // copy the crate into the file
+                    io::copy(&mut krate_req, &mut krate_dest).unwrap();
+
+                    // unzip the tarball
+                    let ungz_tar = flate2::read::GzDecoder::new(fs::File::open(&krate_file_path).unwrap());
+                    // extract the tar archive
+                    let mut archive = tar::Archive::new(ungz_tar);
+                    archive.unpack(&extract_dir).expect("Failed to extract!");
+                }
+                // crate is extracted, return a new Krate object which contains the path to the extracted
+                // sources that clippy can check
+                Crate {
+                    version: version.clone(),
+                    name: name.clone(),
+                    path: extract_dir.join(format!("{name}-{version}/")),
+                    options: options.clone(),
+                }
+            },
+            CrateSource::Git {
+                name,
+                url,
+                commit,
+                options,
+            } => {
+                let repo_path = {
+                    let mut repo_path = PathBuf::from(LINTCHECK_SOURCES);
+                    // add a -git suffix in case we have the same crate from crates.io and a git repo
+                    repo_path.push(format!("{name}-git"));
+                    repo_path
+                };
+                // clone the repo if we have not done so
+                if !repo_path.is_dir() {
+                    println!("Cloning {url} and checking out {commit}");
+                    if !Command::new("git")
+                        .arg("clone")
+                        .arg(url)
+                        .arg(&repo_path)
+                        .status()
+                        .expect("Failed to clone git repo!")
+                        .success()
+                    {
+                        eprintln!("Failed to clone {url} into {}", repo_path.display());
+                    }
+                }
+                // check out the commit/branch/whatever
+                if !Command::new("git")
+                    .args(["-c", "advice.detachedHead=false"])
+                    .arg("checkout")
+                    .arg(commit)
+                    .current_dir(&repo_path)
+                    .status()
+                    .expect("Failed to check out commit")
+                    .success()
+                {
+                    eprintln!("Failed to checkout {commit} of repo at {}", repo_path.display());
+                }
+
+                Crate {
+                    version: commit.clone(),
+                    name: name.clone(),
+                    path: repo_path,
+                    options: options.clone(),
+                }
+            },
+            CrateSource::Path { name, path, options } => {
+                fn is_cache_dir(entry: &DirEntry) -> bool {
+                    fs::read(entry.path().join("CACHEDIR.TAG"))
+                        .map(|x| x.starts_with(b"Signature: 8a477f597d28d172789f06886806bc55"))
+                        .unwrap_or(false)
+                }
+
+                // copy path into the dest_crate_root but skip directories that contain a CACHEDIR.TAG file.
+                // The target/ directory contains a CACHEDIR.TAG file so it is the most commonly skipped directory
+                // as a result of this filter.
+                let dest_crate_root = PathBuf::from(LINTCHECK_SOURCES).join(name);
+                if dest_crate_root.exists() {
+                    println!("Deleting existing directory at {dest_crate_root:?}");
+                    fs::remove_dir_all(&dest_crate_root).unwrap();
+                }
+
+                println!("Copying {path:?} to {dest_crate_root:?}");
+
+                for entry in WalkDir::new(path).into_iter().filter_entry(|e| !is_cache_dir(e)) {
+                    let entry = entry.unwrap();
+                    let entry_path = entry.path();
+                    let relative_entry_path = entry_path.strip_prefix(path).unwrap();
+                    let dest_path = dest_crate_root.join(relative_entry_path);
+                    let metadata = entry_path.symlink_metadata().unwrap();
+
+                    if metadata.is_dir() {
+                        fs::create_dir(dest_path).unwrap();
+                    } else if metadata.is_file() {
+                        fs::copy(entry_path, dest_path).unwrap();
+                    }
+                }
+
+                Crate {
+                    version: String::from("local"),
+                    name: name.clone(),
+                    path: dest_crate_root,
+                    options: options.clone(),
+                }
+            },
+        }
+    }
+}
+
+/// Create necessary directories to run the lintcheck tool.
+///
+/// # Panics
+///
+/// This function panics if creating one of the dirs fails.
+fn create_dirs(krate_download_dir: &Path, extract_dir: &Path) {
+    fs::create_dir("target/lintcheck/").unwrap_or_else(|err| {
+        assert_eq!(
+            err.kind(),
+            ErrorKind::AlreadyExists,
+            "cannot create lintcheck target dir"
+        );
+    });
+    fs::create_dir(krate_download_dir).unwrap_or_else(|err| {
+        assert_eq!(err.kind(), ErrorKind::AlreadyExists, "cannot create crate download dir");
+    });
+    fs::create_dir(extract_dir).unwrap_or_else(|err| {
+        assert_eq!(
+            err.kind(),
+            ErrorKind::AlreadyExists,
+            "cannot create crate extraction dir"
+        );
+    });
+}
diff --git a/src/tools/clippy/lintcheck/src/json.rs b/src/tools/clippy/lintcheck/src/json.rs
index 43d0413c7ceeb..1a652927988e1 100644
--- a/src/tools/clippy/lintcheck/src/json.rs
+++ b/src/tools/clippy/lintcheck/src/json.rs
@@ -1,37 +1,50 @@
-use std::collections::HashMap;
-use std::fmt::Write;
 use std::fs;
-use std::hash::Hash;
 use std::path::Path;
 
+use itertools::EitherOrBoth;
+use serde::{Deserialize, Serialize};
+
 use crate::ClippyWarning;
 
-/// Creates the log file output for [`crate::config::OutputFormat::Json`]
-pub(crate) fn output(clippy_warnings: &[ClippyWarning]) -> String {
-    serde_json::to_string(&clippy_warnings).unwrap()
+#[derive(Deserialize, Serialize)]
+struct LintJson {
+    lint: String,
+    file_name: String,
+    byte_pos: (u32, u32),
+    rendered: String,
 }
 
-fn load_warnings(path: &Path) -> Vec<ClippyWarning> {
-    let file = fs::read(path).unwrap_or_else(|e| panic!("failed to read {}: {e}", path.display()));
-
-    serde_json::from_slice(&file).unwrap_or_else(|e| panic!("failed to deserialize {}: {e}", path.display()))
+impl LintJson {
+    fn key(&self) -> impl Ord + '_ {
+        (self.file_name.as_str(), self.byte_pos, self.lint.as_str())
+    }
 }
 
-/// Group warnings by their primary span location + lint name
-fn create_map(warnings: &[ClippyWarning]) -> HashMap<impl Eq + Hash + '_, Vec<&ClippyWarning>> {
-    let mut map = HashMap::<_, Vec<_>>::with_capacity(warnings.len());
-
-    for warning in warnings {
-        let span = warning.span();
-        let key = (&warning.lint_type, &span.file_name, span.byte_start, span.byte_end);
+/// Creates the log file output for [`crate::config::OutputFormat::Json`]
+pub(crate) fn output(clippy_warnings: Vec<ClippyWarning>) -> String {
+    let mut lints: Vec<LintJson> = clippy_warnings
+        .into_iter()
+        .map(|warning| {
+            let span = warning.span();
+            LintJson {
+                file_name: span.file_name.clone(),
+                byte_pos: (span.byte_start, span.byte_end),
+                lint: warning.lint,
+                rendered: warning.diag.rendered.unwrap(),
+            }
+        })
+        .collect();
+    lints.sort_by(|a, b| a.key().cmp(&b.key()));
+    serde_json::to_string(&lints).unwrap()
+}
 
-        map.entry(key).or_default().push(warning);
-    }
+fn load_warnings(path: &Path) -> Vec<LintJson> {
+    let file = fs::read(path).unwrap_or_else(|e| panic!("failed to read {}: {e}", path.display()));
 
-    map
+    serde_json::from_slice(&file).unwrap_or_else(|e| panic!("failed to deserialize {}: {e}", path.display()))
 }
 
-fn print_warnings(title: &str, warnings: &[&ClippyWarning]) {
+fn print_warnings(title: &str, warnings: &[LintJson]) {
     if warnings.is_empty() {
         return;
     }
@@ -39,31 +52,20 @@ fn print_warnings(title: &str, warnings: &[&ClippyWarning]) {
     println!("### {title}");
     println!("```");
     for warning in warnings {
-        print!("{}", warning.diag);
+        print!("{}", warning.rendered);
     }
     println!("```");
 }
 
-fn print_changed_diff(changed: &[(&[&ClippyWarning], &[&ClippyWarning])]) {
-    fn render(warnings: &[&ClippyWarning]) -> String {
-        let mut rendered = String::new();
-        for warning in warnings {
-            write!(&mut rendered, "{}", warning.diag).unwrap();
-        }
-        rendered
-    }
-
+fn print_changed_diff(changed: &[(LintJson, LintJson)]) {
     if changed.is_empty() {
         return;
     }
 
     println!("### Changed");
     println!("```diff");
-    for &(old, new) in changed {
-        let old_rendered = render(old);
-        let new_rendered = render(new);
-
-        for change in diff::lines(&old_rendered, &new_rendered) {
+    for (old, new) in changed {
+        for change in diff::lines(&old.rendered, &new.rendered) {
             use diff::Result::{Both, Left, Right};
 
             match change {
@@ -86,26 +88,19 @@ pub(crate) fn diff(old_path: &Path, new_path: &Path) {
     let old_warnings = load_warnings(old_path);
     let new_warnings = load_warnings(new_path);
 
-    let old_map = create_map(&old_warnings);
-    let new_map = create_map(&new_warnings);
-
     let mut added = Vec::new();
     let mut removed = Vec::new();
     let mut changed = Vec::new();
 
-    for (key, new) in &new_map {
-        if let Some(old) = old_map.get(key) {
-            if old != new {
-                changed.push((old.as_slice(), new.as_slice()));
-            }
-        } else {
-            added.extend(new);
-        }
-    }
-
-    for (key, old) in &old_map {
-        if !new_map.contains_key(key) {
-            removed.extend(old);
+    for change in itertools::merge_join_by(old_warnings, new_warnings, |old, new| old.key().cmp(&new.key())) {
+        match change {
+            EitherOrBoth::Both(old, new) => {
+                if old.rendered != new.rendered {
+                    changed.push((old, new));
+                }
+            },
+            EitherOrBoth::Left(old) => removed.push(old),
+            EitherOrBoth::Right(new) => added.push(new),
         }
     }
 
diff --git a/src/tools/clippy/lintcheck/src/main.rs b/src/tools/clippy/lintcheck/src/main.rs
index ec72e0eb5dcb5..e37ffab13ac89 100644
--- a/src/tools/clippy/lintcheck/src/main.rs
+++ b/src/tools/clippy/lintcheck/src/main.rs
@@ -5,6 +5,7 @@
 // When a new lint is introduced, we can search the results for new warnings and check for false
 // positives.
 
+#![feature(iter_collect_into)]
 #![warn(
     trivial_casts,
     trivial_numeric_casts,
@@ -12,84 +13,38 @@
     unused_lifetimes,
     unused_qualifications
 )]
-#![allow(clippy::collapsible_else_if, clippy::needless_borrows_for_generic_args)]
+#![allow(
+    clippy::collapsible_else_if,
+    clippy::needless_borrows_for_generic_args,
+    clippy::module_name_repetitions
+)]
 
 mod config;
 mod driver;
+mod input;
 mod json;
+mod output;
 mod popular_crates;
 mod recursive;
 
 use crate::config::{Commands, LintcheckConfig, OutputFormat};
 use crate::recursive::LintcheckServer;
 
-use std::collections::{HashMap, HashSet};
 use std::env::consts::EXE_SUFFIX;
-use std::fmt::{self, Display, Write as _};
-use std::hash::Hash;
-use std::io::{self, ErrorKind};
+use std::io::{self};
 use std::path::{Path, PathBuf};
-use std::process::{Command, ExitStatus, Stdio};
+use std::process::{Command, Stdio};
 use std::sync::atomic::{AtomicUsize, Ordering};
-use std::time::Duration;
-use std::{env, fs, thread};
+use std::{env, fs};
 
-use cargo_metadata::diagnostic::{Diagnostic, DiagnosticSpan};
 use cargo_metadata::Message;
+use input::{read_crates, CrateSource};
+use output::{ClippyCheckOutput, ClippyWarning, RustcIce};
 use rayon::prelude::*;
-use serde::{Deserialize, Serialize};
-use walkdir::{DirEntry, WalkDir};
 
 const LINTCHECK_DOWNLOADS: &str = "target/lintcheck/downloads";
 const LINTCHECK_SOURCES: &str = "target/lintcheck/sources";
 
-/// List of sources to check, loaded from a .toml file
-#[derive(Debug, Deserialize)]
-struct SourceList {
-    crates: HashMap<String, TomlCrate>,
-    #[serde(default)]
-    recursive: RecursiveOptions,
-}
-
-#[derive(Debug, Deserialize, Default)]
-struct RecursiveOptions {
-    ignore: HashSet<String>,
-}
-
-/// A crate source stored inside the .toml
-/// will be translated into on one of the `CrateSource` variants
-#[derive(Debug, Deserialize)]
-struct TomlCrate {
-    name: String,
-    versions: Option<Vec<String>>,
-    git_url: Option<String>,
-    git_hash: Option<String>,
-    path: Option<String>,
-    options: Option<Vec<String>>,
-}
-
-/// Represents an archive we download from crates.io, or a git repo, or a local repo/folder
-/// Once processed (downloaded/extracted/cloned/copied...), this will be translated into a `Crate`
-#[derive(Debug, Deserialize, Eq, Hash, PartialEq, Ord, PartialOrd)]
-enum CrateSource {
-    CratesIo {
-        name: String,
-        version: String,
-        options: Option<Vec<String>>,
-    },
-    Git {
-        name: String,
-        url: String,
-        commit: String,
-        options: Option<Vec<String>>,
-    },
-    Path {
-        name: String,
-        path: PathBuf,
-        options: Option<Vec<String>>,
-    },
-}
-
 /// Represents the actual source code of a crate that we ran "cargo clippy" on
 #[derive(Debug)]
 struct Crate {
@@ -100,248 +55,6 @@ struct Crate {
     options: Option<Vec<String>>,
 }
 
-/// A single emitted output from clippy being executed on a crate. It may either be a
-/// `ClippyWarning`, or a `RustcIce` caused by a panic within clippy. A crate may have many
-/// `ClippyWarning`s but a maximum of one `RustcIce` (at which point clippy halts execution).
-#[derive(Debug)]
-enum ClippyCheckOutput {
-    ClippyWarning(ClippyWarning),
-    RustcIce(RustcIce),
-}
-
-#[derive(Debug)]
-struct RustcIce {
-    pub crate_name: String,
-    pub ice_content: String,
-}
-
-impl Display for RustcIce {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(
-            f,
-            "{}:\n{}\n========================================\n",
-            self.crate_name, self.ice_content
-        )
-    }
-}
-
-impl RustcIce {
-    pub fn from_stderr_and_status(crate_name: &str, status: ExitStatus, stderr: &str) -> Option<Self> {
-        if status.code().unwrap_or(0) == 101
-        /* ice exit status */
-        {
-            Some(Self {
-                crate_name: crate_name.to_owned(),
-                ice_content: stderr.to_owned(),
-            })
-        } else {
-            None
-        }
-    }
-}
-
-/// A single warning that clippy issued while checking a `Crate`
-#[derive(Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
-struct ClippyWarning {
-    crate_name: String,
-    crate_version: String,
-    lint_type: String,
-    diag: Diagnostic,
-}
-
-#[allow(unused)]
-impl ClippyWarning {
-    fn new(mut diag: Diagnostic, crate_name: &str, crate_version: &str) -> Option<Self> {
-        let lint_type = diag.code.clone()?.code;
-        if !(lint_type.contains("clippy") || diag.message.contains("clippy"))
-            || diag.message.contains("could not read cargo metadata")
-        {
-            return None;
-        }
-
-        // --recursive bypasses cargo so we have to strip the rendered output ourselves
-        let rendered = diag.rendered.as_mut().unwrap();
-        *rendered = strip_ansi_escapes::strip_str(&rendered);
-
-        Some(Self {
-            crate_name: crate_name.to_owned(),
-            crate_version: crate_version.to_owned(),
-            lint_type,
-            diag,
-        })
-    }
-
-    fn span(&self) -> &DiagnosticSpan {
-        self.diag.spans.iter().find(|span| span.is_primary).unwrap()
-    }
-
-    fn to_output(&self, format: OutputFormat) -> String {
-        let span = self.span();
-        let mut file = span.file_name.clone();
-        let file_with_pos = format!("{file}:{}:{}", span.line_start, span.line_end);
-        match format {
-            OutputFormat::Text => format!("{file_with_pos} {} \"{}\"\n", self.lint_type, self.diag.message),
-            OutputFormat::Markdown => {
-                if file.starts_with("target") {
-                    file.insert_str(0, "../");
-                }
-
-                let mut output = String::from("| ");
-                write!(output, "[`{file_with_pos}`]({file}#L{})", span.line_start).unwrap();
-                write!(output, r#" | `{:<50}` | "{}" |"#, self.lint_type, self.diag.message).unwrap();
-                output.push('\n');
-                output
-            },
-            OutputFormat::Json => unreachable!("JSON output is handled via serde"),
-        }
-    }
-}
-
-#[allow(clippy::result_large_err)]
-fn get(path: &str) -> Result<ureq::Response, ureq::Error> {
-    const MAX_RETRIES: u8 = 4;
-    let mut retries = 0;
-    loop {
-        match ureq::get(path).call() {
-            Ok(res) => return Ok(res),
-            Err(e) if retries >= MAX_RETRIES => return Err(e),
-            Err(ureq::Error::Transport(e)) => eprintln!("Error: {e}"),
-            Err(e) => return Err(e),
-        }
-        eprintln!("retrying in {retries} seconds...");
-        thread::sleep(Duration::from_secs(u64::from(retries)));
-        retries += 1;
-    }
-}
-
-impl CrateSource {
-    /// Makes the sources available on the disk for clippy to check.
-    /// Clones a git repo and checks out the specified commit or downloads a crate from crates.io or
-    /// copies a local folder
-    fn download_and_extract(&self) -> Crate {
-        match self {
-            CrateSource::CratesIo { name, version, options } => {
-                let extract_dir = PathBuf::from(LINTCHECK_SOURCES);
-                let krate_download_dir = PathBuf::from(LINTCHECK_DOWNLOADS);
-
-                // url to download the crate from crates.io
-                let url = format!("https://crates.io/api/v1/crates/{name}/{version}/download");
-                println!("Downloading and extracting {name} {version} from {url}");
-                create_dirs(&krate_download_dir, &extract_dir);
-
-                let krate_file_path = krate_download_dir.join(format!("{name}-{version}.crate.tar.gz"));
-                // don't download/extract if we already have done so
-                if !krate_file_path.is_file() {
-                    // create a file path to download and write the crate data into
-                    let mut krate_dest = fs::File::create(&krate_file_path).unwrap();
-                    let mut krate_req = get(&url).unwrap().into_reader();
-                    // copy the crate into the file
-                    io::copy(&mut krate_req, &mut krate_dest).unwrap();
-
-                    // unzip the tarball
-                    let ungz_tar = flate2::read::GzDecoder::new(fs::File::open(&krate_file_path).unwrap());
-                    // extract the tar archive
-                    let mut archive = tar::Archive::new(ungz_tar);
-                    archive.unpack(&extract_dir).expect("Failed to extract!");
-                }
-                // crate is extracted, return a new Krate object which contains the path to the extracted
-                // sources that clippy can check
-                Crate {
-                    version: version.clone(),
-                    name: name.clone(),
-                    path: extract_dir.join(format!("{name}-{version}/")),
-                    options: options.clone(),
-                }
-            },
-            CrateSource::Git {
-                name,
-                url,
-                commit,
-                options,
-            } => {
-                let repo_path = {
-                    let mut repo_path = PathBuf::from(LINTCHECK_SOURCES);
-                    // add a -git suffix in case we have the same crate from crates.io and a git repo
-                    repo_path.push(format!("{name}-git"));
-                    repo_path
-                };
-                // clone the repo if we have not done so
-                if !repo_path.is_dir() {
-                    println!("Cloning {url} and checking out {commit}");
-                    if !Command::new("git")
-                        .arg("clone")
-                        .arg(url)
-                        .arg(&repo_path)
-                        .status()
-                        .expect("Failed to clone git repo!")
-                        .success()
-                    {
-                        eprintln!("Failed to clone {url} into {}", repo_path.display());
-                    }
-                }
-                // check out the commit/branch/whatever
-                if !Command::new("git")
-                    .args(["-c", "advice.detachedHead=false"])
-                    .arg("checkout")
-                    .arg(commit)
-                    .current_dir(&repo_path)
-                    .status()
-                    .expect("Failed to check out commit")
-                    .success()
-                {
-                    eprintln!("Failed to checkout {commit} of repo at {}", repo_path.display());
-                }
-
-                Crate {
-                    version: commit.clone(),
-                    name: name.clone(),
-                    path: repo_path,
-                    options: options.clone(),
-                }
-            },
-            CrateSource::Path { name, path, options } => {
-                fn is_cache_dir(entry: &DirEntry) -> bool {
-                    fs::read(entry.path().join("CACHEDIR.TAG"))
-                        .map(|x| x.starts_with(b"Signature: 8a477f597d28d172789f06886806bc55"))
-                        .unwrap_or(false)
-                }
-
-                // copy path into the dest_crate_root but skip directories that contain a CACHEDIR.TAG file.
-                // The target/ directory contains a CACHEDIR.TAG file so it is the most commonly skipped directory
-                // as a result of this filter.
-                let dest_crate_root = PathBuf::from(LINTCHECK_SOURCES).join(name);
-                if dest_crate_root.exists() {
-                    println!("Deleting existing directory at {dest_crate_root:?}");
-                    fs::remove_dir_all(&dest_crate_root).unwrap();
-                }
-
-                println!("Copying {path:?} to {dest_crate_root:?}");
-
-                for entry in WalkDir::new(path).into_iter().filter_entry(|e| !is_cache_dir(e)) {
-                    let entry = entry.unwrap();
-                    let entry_path = entry.path();
-                    let relative_entry_path = entry_path.strip_prefix(path).unwrap();
-                    let dest_path = dest_crate_root.join(relative_entry_path);
-                    let metadata = entry_path.symlink_metadata().unwrap();
-
-                    if metadata.is_dir() {
-                        fs::create_dir(dest_path).unwrap();
-                    } else if metadata.is_file() {
-                        fs::copy(entry_path, dest_path).unwrap();
-                    }
-                }
-
-                Crate {
-                    version: String::from("local"),
-                    name: name.clone(),
-                    path: dest_crate_root,
-                    options: options.clone(),
-                }
-            },
-        }
-    }
-}
-
 impl Crate {
     /// Run `cargo clippy` on the `Crate` and collect and return all the lint warnings that clippy
     /// issued
@@ -352,7 +65,7 @@ impl Crate {
         target_dir_index: &AtomicUsize,
         total_crates_to_lint: usize,
         config: &LintcheckConfig,
-        lint_filter: &[String],
+        lint_levels_args: &[String],
         server: &Option<LintcheckServer>,
     ) -> Vec<ClippyCheckOutput> {
         // advance the atomic index by one
@@ -398,16 +111,9 @@ impl Crate {
             for opt in options {
                 clippy_args.push(opt);
             }
-        } else {
-            clippy_args.extend(["-Wclippy::pedantic", "-Wclippy::cargo"]);
         }
 
-        if lint_filter.is_empty() {
-            clippy_args.push("--cap-lints=warn");
-        } else {
-            clippy_args.push("--cap-lints=allow");
-            clippy_args.extend(lint_filter.iter().map(String::as_str));
-        }
+        clippy_args.extend(lint_levels_args.iter().map(String::as_str));
 
         let mut cmd = Command::new("cargo");
         cmd.arg(if config.fix { "fix" } else { "check" })
@@ -479,7 +185,7 @@ impl Crate {
         // get all clippy warnings and ICEs
         let mut entries: Vec<ClippyCheckOutput> = Message::parse_stream(stdout.as_bytes())
             .filter_map(|msg| match msg {
-                Ok(Message::CompilerMessage(message)) => ClippyWarning::new(message.message, &self.name, &self.version),
+                Ok(Message::CompilerMessage(message)) => ClippyWarning::new(message.message),
                 _ => None,
             })
             .map(ClippyCheckOutput::ClippyWarning)
@@ -509,96 +215,6 @@ fn build_clippy() -> String {
     String::from_utf8_lossy(&output.stdout).into_owned()
 }
 
-/// Read a `lintcheck_crates.toml` file
-fn read_crates(toml_path: &Path) -> (Vec<CrateSource>, RecursiveOptions) {
-    let toml_content: String =
-        fs::read_to_string(toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
-    let crate_list: SourceList =
-        toml::from_str(&toml_content).unwrap_or_else(|e| panic!("Failed to parse {}: \n{e}", toml_path.display()));
-    // parse the hashmap of the toml file into a list of crates
-    let tomlcrates: Vec<TomlCrate> = crate_list.crates.into_values().collect();
-
-    // flatten TomlCrates into CrateSources (one TomlCrates may represent several versions of a crate =>
-    // multiple Cratesources)
-    let mut crate_sources = Vec::new();
-    for tk in tomlcrates {
-        if let Some(ref path) = tk.path {
-            crate_sources.push(CrateSource::Path {
-                name: tk.name.clone(),
-                path: PathBuf::from(path),
-                options: tk.options.clone(),
-            });
-        } else if let Some(ref versions) = tk.versions {
-            // if we have multiple versions, save each one
-            for ver in versions {
-                crate_sources.push(CrateSource::CratesIo {
-                    name: tk.name.clone(),
-                    version: ver.to_string(),
-                    options: tk.options.clone(),
-                });
-            }
-        } else if tk.git_url.is_some() && tk.git_hash.is_some() {
-            // otherwise, we should have a git source
-            crate_sources.push(CrateSource::Git {
-                name: tk.name.clone(),
-                url: tk.git_url.clone().unwrap(),
-                commit: tk.git_hash.clone().unwrap(),
-                options: tk.options.clone(),
-            });
-        } else {
-            panic!("Invalid crate source: {tk:?}");
-        }
-
-        // if we have a version as well as a git data OR only one git data, something is funky
-        if tk.versions.is_some() && (tk.git_url.is_some() || tk.git_hash.is_some())
-            || tk.git_hash.is_some() != tk.git_url.is_some()
-        {
-            eprintln!("tomlkrate: {tk:?}");
-            assert_eq!(
-                tk.git_hash.is_some(),
-                tk.git_url.is_some(),
-                "Error: Encountered TomlCrate with only one of git_hash and git_url!"
-            );
-            assert!(
-                tk.path.is_none() || (tk.git_hash.is_none() && tk.versions.is_none()),
-                "Error: TomlCrate can only have one of 'git_.*', 'version' or 'path' fields"
-            );
-            unreachable!("Failed to translate TomlCrate into CrateSource!");
-        }
-    }
-    // sort the crates
-    crate_sources.sort();
-
-    (crate_sources, crate_list.recursive)
-}
-
-/// Generate a short list of occurring lints-types and their count
-fn gather_stats(warnings: &[ClippyWarning]) -> (String, HashMap<&String, usize>) {
-    // count lint type occurrences
-    let mut counter: HashMap<&String, usize> = HashMap::new();
-    warnings
-        .iter()
-        .for_each(|wrn| *counter.entry(&wrn.lint_type).or_insert(0) += 1);
-
-    // collect into a tupled list for sorting
-    let mut stats: Vec<(&&String, &usize)> = counter.iter().collect();
-    // sort by "000{count} {clippy::lintname}"
-    // to not have a lint with 200 and 2 warnings take the same spot
-    stats.sort_by_key(|(lint, count)| format!("{count:0>4}, {lint}"));
-
-    let mut header = String::from("| lint                                               | count |\n");
-    header.push_str("| -------------------------------------------------- | ----- |\n");
-    let stats_string = stats
-        .iter()
-        .map(|(lint, count)| format!("| {lint:<50} |  {count:>4} |\n"))
-        .fold(header, |mut table, line| {
-            table.push_str(&line);
-            table
-        });
-
-    (stats_string, counter)
-}
-
 fn main() {
     // We're being executed as a `RUSTC_WRAPPER` as part of `--recursive`
     if let Ok(addr) = env::var("LINTCHECK_SERVER") {
@@ -638,15 +254,39 @@ fn lintcheck(config: LintcheckConfig) {
     let (crates, recursive_options) = read_crates(&config.sources_toml_path);
 
     let counter = AtomicUsize::new(1);
-    let lint_filter: Vec<String> = config
-        .lint_filter
-        .iter()
-        .map(|filter| {
-            let mut filter = filter.clone();
-            filter.insert_str(0, "--force-warn=");
-            filter
-        })
-        .collect();
+    let mut lint_level_args: Vec<String> = vec![];
+    if config.lint_filter.is_empty() {
+        lint_level_args.push("--cap-lints=warn".to_string());
+
+        // Set allow-by-default to warn
+        if config.warn_all {
+            [
+                "clippy::cargo",
+                "clippy::nursery",
+                "clippy::pedantic",
+                "clippy::restriction",
+            ]
+            .iter()
+            .map(|group| format!("--warn={group}"))
+            .collect_into(&mut lint_level_args);
+        } else {
+            ["clippy::cargo", "clippy::pedantic"]
+                .iter()
+                .map(|group| format!("--warn={group}"))
+                .collect_into(&mut lint_level_args);
+        }
+    } else {
+        lint_level_args.push("--cap-lints=allow".to_string());
+        config
+            .lint_filter
+            .iter()
+            .map(|filter| {
+                let mut filter = filter.clone();
+                filter.insert_str(0, "--force-warn=");
+                filter
+            })
+            .collect_into(&mut lint_level_args);
+    };
 
     let crates: Vec<Crate> = crates
         .into_iter()
@@ -698,7 +338,7 @@ fn lintcheck(config: LintcheckConfig) {
                 &counter,
                 crates.len(),
                 &config,
-                &lint_filter,
+                &lint_level_args,
                 &server,
             )
         })
@@ -727,7 +367,9 @@ fn lintcheck(config: LintcheckConfig) {
     }
 
     let text = match config.format {
-        OutputFormat::Text | OutputFormat::Markdown => output(&warnings, &raw_ices, clippy_ver, &config),
+        OutputFormat::Text | OutputFormat::Markdown => {
+            output::summarize_and_print_changes(&warnings, &raw_ices, clippy_ver, &config)
+        },
         OutputFormat::Json => {
             if !raw_ices.is_empty() {
                 for ice in raw_ices {
@@ -736,7 +378,7 @@ fn lintcheck(config: LintcheckConfig) {
                 panic!("Some crates ICEd");
             }
 
-            json::output(&warnings)
+            json::output(warnings)
         },
     };
 
@@ -745,135 +387,6 @@ fn lintcheck(config: LintcheckConfig) {
     fs::write(&config.lintcheck_results_path, text).unwrap();
 }
 
-/// Creates the log file output for [`OutputFormat::Text`] and [`OutputFormat::Markdown`]
-fn output(warnings: &[ClippyWarning], ices: &[RustcIce], clippy_ver: String, config: &LintcheckConfig) -> String {
-    // generate some stats
-    let (stats_formatted, new_stats) = gather_stats(warnings);
-    let old_stats = read_stats_from_file(&config.lintcheck_results_path);
-
-    let mut all_msgs: Vec<String> = warnings.iter().map(|warn| warn.to_output(config.format)).collect();
-    all_msgs.sort();
-    all_msgs.push("\n\n### Stats:\n\n".into());
-    all_msgs.push(stats_formatted);
-
-    let mut text = clippy_ver; // clippy version number on top
-    text.push_str("\n### Reports\n\n");
-    if config.format == OutputFormat::Markdown {
-        text.push_str("| file | lint | message |\n");
-        text.push_str("| --- | --- | --- |\n");
-    }
-    write!(text, "{}", all_msgs.join("")).unwrap();
-    text.push_str("\n\n### ICEs:\n");
-    for ice in ices {
-        writeln!(text, "{ice}").unwrap();
-    }
-
-    print_stats(old_stats, new_stats, &config.lint_filter);
-
-    text
-}
-
-/// read the previous stats from the lintcheck-log file
-fn read_stats_from_file(file_path: &Path) -> HashMap<String, usize> {
-    let file_content: String = match fs::read_to_string(file_path).ok() {
-        Some(content) => content,
-        None => {
-            return HashMap::new();
-        },
-    };
-
-    let lines: Vec<String> = file_content.lines().map(ToString::to_string).collect();
-
-    lines
-        .iter()
-        .skip_while(|line| line.as_str() != "### Stats:")
-        // Skipping the table header and the `Stats:` label
-        .skip(4)
-        .take_while(|line| line.starts_with("| "))
-        .filter_map(|line| {
-            let mut spl = line.split('|');
-            // Skip the first `|` symbol
-            spl.next();
-            if let (Some(lint), Some(count)) = (spl.next(), spl.next()) {
-                Some((lint.trim().to_string(), count.trim().parse::<usize>().unwrap()))
-            } else {
-                None
-            }
-        })
-        .collect::<HashMap<String, usize>>()
-}
-
-/// print how lint counts changed between runs
-fn print_stats(old_stats: HashMap<String, usize>, new_stats: HashMap<&String, usize>, lint_filter: &[String]) {
-    let same_in_both_hashmaps = old_stats
-        .iter()
-        .filter(|(old_key, old_val)| new_stats.get::<&String>(old_key) == Some(old_val))
-        .map(|(k, v)| (k.to_string(), *v))
-        .collect::<Vec<(String, usize)>>();
-
-    let mut old_stats_deduped = old_stats;
-    let mut new_stats_deduped = new_stats;
-
-    // remove duplicates from both hashmaps
-    for (k, v) in &same_in_both_hashmaps {
-        assert!(old_stats_deduped.remove(k) == Some(*v));
-        assert!(new_stats_deduped.remove(k) == Some(*v));
-    }
-
-    println!("\nStats:");
-
-    // list all new counts  (key is in new stats but not in old stats)
-    new_stats_deduped
-        .iter()
-        .filter(|(new_key, _)| !old_stats_deduped.contains_key::<str>(new_key))
-        .for_each(|(new_key, new_value)| {
-            println!("{new_key} 0 => {new_value}");
-        });
-
-    // list all changed counts (key is in both maps but value differs)
-    new_stats_deduped
-        .iter()
-        .filter(|(new_key, _new_val)| old_stats_deduped.contains_key::<str>(new_key))
-        .for_each(|(new_key, new_val)| {
-            let old_val = old_stats_deduped.get::<str>(new_key).unwrap();
-            println!("{new_key} {old_val} => {new_val}");
-        });
-
-    // list all gone counts (key is in old status but not in new stats)
-    old_stats_deduped
-        .iter()
-        .filter(|(old_key, _)| !new_stats_deduped.contains_key::<&String>(old_key))
-        .filter(|(old_key, _)| lint_filter.is_empty() || lint_filter.contains(old_key))
-        .for_each(|(old_key, old_value)| {
-            println!("{old_key} {old_value} => 0");
-        });
-}
-
-/// Create necessary directories to run the lintcheck tool.
-///
-/// # Panics
-///
-/// This function panics if creating one of the dirs fails.
-fn create_dirs(krate_download_dir: &Path, extract_dir: &Path) {
-    fs::create_dir("target/lintcheck/").unwrap_or_else(|err| {
-        assert_eq!(
-            err.kind(),
-            ErrorKind::AlreadyExists,
-            "cannot create lintcheck target dir"
-        );
-    });
-    fs::create_dir(krate_download_dir).unwrap_or_else(|err| {
-        assert_eq!(err.kind(), ErrorKind::AlreadyExists, "cannot create crate download dir");
-    });
-    fs::create_dir(extract_dir).unwrap_or_else(|err| {
-        assert_eq!(
-            err.kind(),
-            ErrorKind::AlreadyExists,
-            "cannot create crate extraction dir"
-        );
-    });
-}
-
 /// Returns the path to the Clippy project directory
 #[must_use]
 fn clippy_project_root() -> &'static Path {
diff --git a/src/tools/clippy/lintcheck/src/output.rs b/src/tools/clippy/lintcheck/src/output.rs
new file mode 100644
index 0000000000000..4bfc554ef9e61
--- /dev/null
+++ b/src/tools/clippy/lintcheck/src/output.rs
@@ -0,0 +1,235 @@
+use cargo_metadata::diagnostic::{Diagnostic, DiagnosticSpan};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::fmt::{self, Write as _};
+use std::fs;
+use std::path::Path;
+use std::process::ExitStatus;
+
+use crate::config::{LintcheckConfig, OutputFormat};
+
+/// A single emitted output from clippy being executed on a crate. It may either be a
+/// `ClippyWarning`, or a `RustcIce` caused by a panic within clippy. A crate may have many
+/// `ClippyWarning`s but a maximum of one `RustcIce` (at which point clippy halts execution).
+#[derive(Debug)]
+pub enum ClippyCheckOutput {
+    ClippyWarning(ClippyWarning),
+    RustcIce(RustcIce),
+}
+
+#[derive(Debug)]
+pub struct RustcIce {
+    pub crate_name: String,
+    pub ice_content: String,
+}
+
+impl fmt::Display for RustcIce {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{}:\n{}\n========================================\n",
+            self.crate_name, self.ice_content
+        )
+    }
+}
+
+impl RustcIce {
+    pub fn from_stderr_and_status(crate_name: &str, status: ExitStatus, stderr: &str) -> Option<Self> {
+        if status.code().unwrap_or(0) == 101
+        /* ice exit status */
+        {
+            Some(Self {
+                crate_name: crate_name.to_owned(),
+                ice_content: stderr.to_owned(),
+            })
+        } else {
+            None
+        }
+    }
+}
+
+/// A single warning that clippy issued while checking a `Crate`
+#[derive(Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct ClippyWarning {
+    pub lint: String,
+    pub diag: Diagnostic,
+}
+
+#[allow(unused)]
+impl ClippyWarning {
+    pub fn new(mut diag: Diagnostic) -> Option<Self> {
+        let lint = diag.code.clone()?.code;
+        if !(lint.contains("clippy") || diag.message.contains("clippy"))
+            || diag.message.contains("could not read cargo metadata")
+        {
+            return None;
+        }
+
+        // --recursive bypasses cargo so we have to strip the rendered output ourselves
+        let rendered = diag.rendered.as_mut().unwrap();
+        *rendered = strip_ansi_escapes::strip_str(&rendered);
+
+        Some(Self { lint, diag })
+    }
+
+    pub fn span(&self) -> &DiagnosticSpan {
+        self.diag.spans.iter().find(|span| span.is_primary).unwrap()
+    }
+
+    pub fn to_output(&self, format: OutputFormat) -> String {
+        let span = self.span();
+        let mut file = span.file_name.clone();
+        let file_with_pos = format!("{file}:{}:{}", span.line_start, span.line_end);
+        match format {
+            OutputFormat::Text => format!("{file_with_pos} {} \"{}\"\n", self.lint, self.diag.message),
+            OutputFormat::Markdown => {
+                if file.starts_with("target") {
+                    file.insert_str(0, "../");
+                }
+
+                let mut output = String::from("| ");
+                write!(output, "[`{file_with_pos}`]({file}#L{})", span.line_start).unwrap();
+                write!(output, r#" | `{:<50}` | "{}" |"#, self.lint, self.diag.message).unwrap();
+                output.push('\n');
+                output
+            },
+            OutputFormat::Json => unreachable!("JSON output is handled via serde"),
+        }
+    }
+}
+
+/// Creates the log file output for [`OutputFormat::Text`] and [`OutputFormat::Markdown`]
+pub fn summarize_and_print_changes(
+    warnings: &[ClippyWarning],
+    ices: &[RustcIce],
+    clippy_ver: String,
+    config: &LintcheckConfig,
+) -> String {
+    // generate some stats
+    let (stats_formatted, new_stats) = gather_stats(warnings);
+    let old_stats = read_stats_from_file(&config.lintcheck_results_path);
+
+    let mut all_msgs: Vec<String> = warnings.iter().map(|warn| warn.to_output(config.format)).collect();
+    all_msgs.sort();
+    all_msgs.push("\n\n### Stats:\n\n".into());
+    all_msgs.push(stats_formatted);
+
+    let mut text = clippy_ver; // clippy version number on top
+    text.push_str("\n### Reports\n\n");
+    if config.format == OutputFormat::Markdown {
+        text.push_str("| file | lint | message |\n");
+        text.push_str("| --- | --- | --- |\n");
+    }
+    write!(text, "{}", all_msgs.join("")).unwrap();
+    text.push_str("\n\n### ICEs:\n");
+    for ice in ices {
+        writeln!(text, "{ice}").unwrap();
+    }
+
+    print_stats(old_stats, new_stats, &config.lint_filter);
+
+    text
+}
+
+/// Generate a short list of occurring lints-types and their count
+fn gather_stats(warnings: &[ClippyWarning]) -> (String, HashMap<&String, usize>) {
+    // count lint type occurrences
+    let mut counter: HashMap<&String, usize> = HashMap::new();
+    warnings
+        .iter()
+        .for_each(|wrn| *counter.entry(&wrn.lint).or_insert(0) += 1);
+
+    // collect into a tupled list for sorting
+    let mut stats: Vec<(&&String, &usize)> = counter.iter().collect();
+    // sort by "000{count} {clippy::lintname}"
+    // to not have a lint with 200 and 2 warnings take the same spot
+    stats.sort_by_key(|(lint, count)| format!("{count:0>4}, {lint}"));
+
+    let mut header = String::from("| lint                                               | count |\n");
+    header.push_str("| -------------------------------------------------- | ----- |\n");
+    let stats_string = stats
+        .iter()
+        .map(|(lint, count)| format!("| {lint:<50} |  {count:>4} |\n"))
+        .fold(header, |mut table, line| {
+            table.push_str(&line);
+            table
+        });
+
+    (stats_string, counter)
+}
+
+/// read the previous stats from the lintcheck-log file
+fn read_stats_from_file(file_path: &Path) -> HashMap<String, usize> {
+    let file_content: String = match fs::read_to_string(file_path).ok() {
+        Some(content) => content,
+        None => {
+            return HashMap::new();
+        },
+    };
+
+    let lines: Vec<String> = file_content.lines().map(ToString::to_string).collect();
+
+    lines
+        .iter()
+        .skip_while(|line| line.as_str() != "### Stats:")
+        // Skipping the table header and the `Stats:` label
+        .skip(4)
+        .take_while(|line| line.starts_with("| "))
+        .filter_map(|line| {
+            let mut spl = line.split('|');
+            // Skip the first `|` symbol
+            spl.next();
+            if let (Some(lint), Some(count)) = (spl.next(), spl.next()) {
+                Some((lint.trim().to_string(), count.trim().parse::<usize>().unwrap()))
+            } else {
+                None
+            }
+        })
+        .collect::<HashMap<String, usize>>()
+}
+
+/// print how lint counts changed between runs
+fn print_stats(old_stats: HashMap<String, usize>, new_stats: HashMap<&String, usize>, lint_filter: &[String]) {
+    let same_in_both_hashmaps = old_stats
+        .iter()
+        .filter(|(old_key, old_val)| new_stats.get::<&String>(old_key) == Some(old_val))
+        .map(|(k, v)| (k.to_string(), *v))
+        .collect::<Vec<(String, usize)>>();
+
+    let mut old_stats_deduped = old_stats;
+    let mut new_stats_deduped = new_stats;
+
+    // remove duplicates from both hashmaps
+    for (k, v) in &same_in_both_hashmaps {
+        assert!(old_stats_deduped.remove(k) == Some(*v));
+        assert!(new_stats_deduped.remove(k) == Some(*v));
+    }
+
+    println!("\nStats:");
+
+    // list all new counts  (key is in new stats but not in old stats)
+    new_stats_deduped
+        .iter()
+        .filter(|(new_key, _)| !old_stats_deduped.contains_key::<str>(new_key))
+        .for_each(|(new_key, new_value)| {
+            println!("{new_key} 0 => {new_value}");
+        });
+
+    // list all changed counts (key is in both maps but value differs)
+    new_stats_deduped
+        .iter()
+        .filter(|(new_key, _new_val)| old_stats_deduped.contains_key::<str>(new_key))
+        .for_each(|(new_key, new_val)| {
+            let old_val = old_stats_deduped.get::<str>(new_key).unwrap();
+            println!("{new_key} {old_val} => {new_val}");
+        });
+
+    // list all gone counts (key is in old status but not in new stats)
+    old_stats_deduped
+        .iter()
+        .filter(|(old_key, _)| !new_stats_deduped.contains_key::<&String>(old_key))
+        .filter(|(old_key, _)| lint_filter.is_empty() || lint_filter.contains(old_key))
+        .for_each(|(old_key, old_value)| {
+            println!("{old_key} {old_value} => 0");
+        });
+}
diff --git a/src/tools/clippy/lintcheck/src/popular_crates.rs b/src/tools/clippy/lintcheck/src/popular_crates.rs
index 880a8bd81f083..ad8fc440c4240 100644
--- a/src/tools/clippy/lintcheck/src/popular_crates.rs
+++ b/src/tools/clippy/lintcheck/src/popular_crates.rs
@@ -44,7 +44,7 @@ pub(crate) fn fetch(output: PathBuf, number: usize) -> Result<(), Box<dyn Error>
 
     let mut out = "[crates]\n".to_string();
     for Crate { name, max_version } in crates {
-        writeln!(out, "{name} = {{ name = '{name}', versions = ['{max_version}'] }}").unwrap();
+        writeln!(out, "{name} = {{ name = '{name}', version = '{max_version}' }}").unwrap();
     }
     fs::write(output, out)?;
 
diff --git a/src/tools/clippy/lintcheck/src/recursive.rs b/src/tools/clippy/lintcheck/src/recursive.rs
index 994fa3c3b239a..373ca6f991841 100644
--- a/src/tools/clippy/lintcheck/src/recursive.rs
+++ b/src/tools/clippy/lintcheck/src/recursive.rs
@@ -3,7 +3,8 @@
 //! [`LintcheckServer`] to ask if it should be skipped, and if not sends the stderr of running
 //! clippy on the crate to the server
 
-use crate::{ClippyWarning, RecursiveOptions};
+use crate::input::RecursiveOptions;
+use crate::ClippyWarning;
 
 use std::collections::HashSet;
 use std::io::{BufRead, BufReader, Read, Write};
@@ -19,8 +20,6 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Eq, Hash, PartialEq, Clone, Serialize, Deserialize)]
 pub(crate) struct DriverInfo {
     pub package_name: String,
-    pub crate_name: String,
-    pub version: String,
 }
 
 pub(crate) fn serialize_line<T, W>(value: &T, writer: &mut W)
@@ -65,7 +64,7 @@ fn process_stream(
     let messages = stderr
         .lines()
         .filter_map(|json_msg| serde_json::from_str::<Diagnostic>(json_msg).ok())
-        .filter_map(|diag| ClippyWarning::new(diag, &driver_info.package_name, &driver_info.version));
+        .filter_map(ClippyWarning::new);
 
     for message in messages {
         sender.send(message).unwrap();
diff --git a/src/tools/clippy/rust-toolchain b/src/tools/clippy/rust-toolchain
index 72b50d59f7e9a..a61c22c59f980 100644
--- a/src/tools/clippy/rust-toolchain
+++ b/src/tools/clippy/rust-toolchain
@@ -1,3 +1,4 @@
 [toolchain]
-channel = "nightly-2024-06-27"
+channel = "nightly-2024-07-11"
 components = ["cargo", "llvm-tools", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
+profile = "minimal"
diff --git a/src/tools/clippy/tests/ui-internal/disallow_span_lint.stderr b/src/tools/clippy/tests/ui-internal/disallow_span_lint.stderr
index 1be4b665bcbac..66eda44f74556 100644
--- a/src/tools/clippy/tests/ui-internal/disallow_span_lint.stderr
+++ b/src/tools/clippy/tests/ui-internal/disallow_span_lint.stderr
@@ -1,22 +1,18 @@
 error: use of a disallowed method `rustc_lint::context::LintContext::span_lint`
-  --> tests/ui-internal/disallow_span_lint.rs:14:5
+  --> tests/ui-internal/disallow_span_lint.rs:14:8
    |
-LL | /     cx.span_lint(lint, span, |lint| {
-LL | |         lint.primary_message(msg);
-LL | |     });
-   | |______^
+LL |     cx.span_lint(lint, span, |lint| {
+   |        ^^^^^^^^^
    |
    = note: this function does not add a link to our documentation, please use the `clippy_utils::diagnostics::span_lint*` functions instead (from clippy.toml)
    = note: `-D clippy::disallowed-methods` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::disallowed_methods)]`
 
 error: use of a disallowed method `rustc_middle::ty::context::TyCtxt::node_span_lint`
-  --> tests/ui-internal/disallow_span_lint.rs:20:5
+  --> tests/ui-internal/disallow_span_lint.rs:20:9
    |
-LL | /     tcx.node_span_lint(lint, hir_id, span, |lint| {
-LL | |         lint.primary_message(msg);
-LL | |     });
-   | |______^
+LL |     tcx.node_span_lint(lint, hir_id, span, |lint| {
+   |         ^^^^^^^^^^^^^^
    |
    = note: this function does not add a link to our documentation, please use the `clippy_utils::diagnostics::span_lint_hir*` functions instead (from clippy.toml)
 
diff --git a/src/tools/clippy/tests/ui-toml/await_holding_invalid_type/await_holding_invalid_type.stderr b/src/tools/clippy/tests/ui-toml/await_holding_invalid_type/await_holding_invalid_type.stderr
index a74d8757e4a5f..016ee502c242f 100644
--- a/src/tools/clippy/tests/ui-toml/await_holding_invalid_type/await_holding_invalid_type.stderr
+++ b/src/tools/clippy/tests/ui-toml/await_holding_invalid_type/await_holding_invalid_type.stderr
@@ -1,4 +1,4 @@
-error: `std::string::String` may not be held across an `await` point per `clippy.toml`
+error: `std::string::String` may not be held across an await point per `clippy.toml`
   --> tests/ui-toml/await_holding_invalid_type/await_holding_invalid_type.rs:5:9
    |
 LL |     let _x = String::from("hello");
@@ -8,13 +8,13 @@ LL |     let _x = String::from("hello");
    = note: `-D clippy::await-holding-invalid-type` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::await_holding_invalid_type)]`
 
-error: `std::net::Ipv4Addr` may not be held across an `await` point per `clippy.toml`
+error: `std::net::Ipv4Addr` may not be held across an await point per `clippy.toml`
   --> tests/ui-toml/await_holding_invalid_type/await_holding_invalid_type.rs:10:9
    |
 LL |     let x = Ipv4Addr::new(127, 0, 0, 1);
    |         ^
 
-error: `std::string::String` may not be held across an `await` point per `clippy.toml`
+error: `std::string::String` may not be held across an await point per `clippy.toml`
   --> tests/ui-toml/await_holding_invalid_type/await_holding_invalid_type.rs:33:13
    |
 LL |         let _x = String::from("hi!");
diff --git a/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/clippy.toml b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/clippy.toml
new file mode 100644
index 0000000000000..cda8d17eed44c
--- /dev/null
+++ b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/clippy.toml
@@ -0,0 +1 @@
+avoid-breaking-exported-api = false
diff --git a/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.fixed b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.fixed
new file mode 100644
index 0000000000000..40556ca5410f2
--- /dev/null
+++ b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.fixed
@@ -0,0 +1,10 @@
+#![warn(clippy::needless_pass_by_ref_mut)]
+#![allow(clippy::ptr_arg)]
+
+// Should warn
+pub fn pub_foo(s: &Vec<u32>, b: &u32, x: &mut u32) {
+    //~^ ERROR: this argument is a mutable reference, but not used mutably
+    *x += *b + s.len() as u32;
+}
+
+fn main() {}
diff --git a/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.rs b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.rs
new file mode 100644
index 0000000000000..bbc63ceb15a3c
--- /dev/null
+++ b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.rs
@@ -0,0 +1,10 @@
+#![warn(clippy::needless_pass_by_ref_mut)]
+#![allow(clippy::ptr_arg)]
+
+// Should warn
+pub fn pub_foo(s: &mut Vec<u32>, b: &u32, x: &mut u32) {
+    //~^ ERROR: this argument is a mutable reference, but not used mutably
+    *x += *b + s.len() as u32;
+}
+
+fn main() {}
diff --git a/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.stderr b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.stderr
new file mode 100644
index 0000000000000..c10607bf4bab8
--- /dev/null
+++ b/src/tools/clippy/tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.stderr
@@ -0,0 +1,12 @@
+error: this argument is a mutable reference, but not used mutably
+  --> tests/ui-toml/needless_pass_by_ref_mut/needless_pass_by_ref_mut.rs:5:19
+   |
+LL | pub fn pub_foo(s: &mut Vec<u32>, b: &u32, x: &mut u32) {
+   |                   ^^^^^^^^^^^^^ help: consider changing to: `&Vec<u32>`
+   |
+   = warning: changing this function will impact semver compatibility
+   = note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::needless_pass_by_ref_mut)]`
+
+error: aborting due to 1 previous error
+
diff --git a/src/tools/clippy/tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.stderr b/src/tools/clippy/tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.stderr
index 4afbbf5f80791..f661e76cc746e 100644
--- a/src/tools/clippy/tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.stderr
+++ b/src/tools/clippy/tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.stderr
@@ -2,36 +2,36 @@ error: use of a disallowed method `regex::Regex::new`
   --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:35:14
    |
 LL |     let re = Regex::new(r"ab.*c").unwrap();
-   |              ^^^^^^^^^^^^^^^^^^^^
+   |              ^^^^^^^^^^
    |
    = note: `-D clippy::disallowed-methods` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::disallowed_methods)]`
 
 error: use of a disallowed method `regex::Regex::is_match`
-  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:36:5
+  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:36:8
    |
 LL |     re.is_match("abc");
-   |     ^^^^^^^^^^^^^^^^^^
+   |        ^^^^^^^^
    |
    = note: no matching allowed (from clippy.toml)
 
 error: use of a disallowed method `std::iter::Iterator::sum`
-  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:39:5
+  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:39:14
    |
 LL |     a.iter().sum::<i32>();
-   |     ^^^^^^^^^^^^^^^^^^^^^
+   |              ^^^
 
 error: use of a disallowed method `slice::sort_unstable`
-  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:41:5
+  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:41:7
    |
 LL |     a.sort_unstable();
-   |     ^^^^^^^^^^^^^^^^^
+   |       ^^^^^^^^^^^^^
 
 error: use of a disallowed method `f32::clamp`
-  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:44:13
+  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:44:20
    |
 LL |     let _ = 2.0f32.clamp(3.0f32, 4.0f32);
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                    ^^^^^
 
 error: use of a disallowed method `regex::Regex::new`
   --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:47:61
@@ -55,37 +55,37 @@ error: use of a disallowed method `futures::stream::select_all`
   --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:54:31
    |
 LL |     let same_name_as_module = select_all(vec![empty::<()>()]);
-   |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                               ^^^^^^^^^^
 
 error: use of a disallowed method `conf_disallowed_methods::local_fn`
   --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:56:5
    |
 LL |     local_fn();
-   |     ^^^^^^^^^^
+   |     ^^^^^^^^
 
 error: use of a disallowed method `conf_disallowed_methods::local_mod::f`
   --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:57:5
    |
 LL |     local_mod::f();
-   |     ^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^
 
 error: use of a disallowed method `conf_disallowed_methods::Struct::method`
-  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:59:5
+  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:59:7
    |
 LL |     s.method();
-   |     ^^^^^^^^^^
+   |       ^^^^^^
 
 error: use of a disallowed method `conf_disallowed_methods::Trait::provided_method`
-  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:60:5
+  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:60:7
    |
 LL |     s.provided_method();
-   |     ^^^^^^^^^^^^^^^^^^^
+   |       ^^^^^^^^^^^^^^^
 
 error: use of a disallowed method `conf_disallowed_methods::Trait::implemented_method`
-  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:61:5
+  --> tests/ui-toml/toml_disallowed_methods/conf_disallowed_methods.rs:61:7
    |
 LL |     s.implemented_method();
-   |     ^^^^^^^^^^^^^^^^^^^^^^
+   |       ^^^^^^^^^^^^^^^^^^
 
 error: aborting due to 14 previous errors
 
diff --git a/src/tools/clippy/tests/ui/assertions_on_constants.rs b/src/tools/clippy/tests/ui/assertions_on_constants.rs
index 1309ae45d0ae5..957154e60dece 100644
--- a/src/tools/clippy/tests/ui/assertions_on_constants.rs
+++ b/src/tools/clippy/tests/ui/assertions_on_constants.rs
@@ -1,4 +1,4 @@
-#![allow(non_fmt_panics, clippy::needless_bool)]
+#![allow(non_fmt_panics, clippy::needless_bool, clippy::eq_op)]
 
 macro_rules! assert_const {
     ($len:expr) => {
@@ -49,7 +49,16 @@ fn main() {
     const _: () = assert!(true);
     //~^ ERROR: `assert!(true)` will be optimized out by the compiler
 
+    assert!(8 == (7 + 1));
+    //~^ ERROR: `assert!(true)` will be optimized out by the compiler
+
     // Don't lint if the value is dependent on a defined constant:
     const N: usize = 1024;
     const _: () = assert!(N.is_power_of_two());
 }
+
+const _: () = {
+    assert!(true);
+    //~^ ERROR: `assert!(true)` will be optimized out by the compiler
+    assert!(8 == (7 + 1));
+};
diff --git a/src/tools/clippy/tests/ui/assertions_on_constants.stderr b/src/tools/clippy/tests/ui/assertions_on_constants.stderr
index 00f117c949206..e164a999c43ee 100644
--- a/src/tools/clippy/tests/ui/assertions_on_constants.stderr
+++ b/src/tools/clippy/tests/ui/assertions_on_constants.stderr
@@ -80,5 +80,21 @@ LL |     const _: () = assert!(true);
    |
    = help: remove it
 
-error: aborting due to 10 previous errors
+error: `assert!(true)` will be optimized out by the compiler
+  --> tests/ui/assertions_on_constants.rs:52:5
+   |
+LL |     assert!(8 == (7 + 1));
+   |     ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: remove it
+
+error: `assert!(true)` will be optimized out by the compiler
+  --> tests/ui/assertions_on_constants.rs:61:5
+   |
+LL |     assert!(true);
+   |     ^^^^^^^^^^^^^
+   |
+   = help: remove it
+
+error: aborting due to 12 previous errors
 
diff --git a/src/tools/clippy/tests/ui/await_holding_lock.rs b/src/tools/clippy/tests/ui/await_holding_lock.rs
index 8e5510e6cd01c..cecf00c934fee 100644
--- a/src/tools/clippy/tests/ui/await_holding_lock.rs
+++ b/src/tools/clippy/tests/ui/await_holding_lock.rs
@@ -8,7 +8,7 @@ mod std_mutex {
 
     pub async fn bad(x: &Mutex<u32>) -> u32 {
         let guard = x.lock().unwrap();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
         baz().await
     }
 
@@ -24,13 +24,13 @@ mod std_mutex {
 
     pub async fn bad_rw(x: &RwLock<u32>) -> u32 {
         let guard = x.read().unwrap();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
         baz().await
     }
 
     pub async fn bad_rw_write(x: &RwLock<u32>) -> u32 {
         let mut guard = x.write().unwrap();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
         baz().await
     }
 
@@ -52,7 +52,7 @@ mod std_mutex {
         let first = baz().await;
 
         let guard = x.lock().unwrap();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
 
         let second = baz().await;
 
@@ -66,7 +66,7 @@ mod std_mutex {
 
         let second = {
             let guard = x.lock().unwrap();
-            //~^ ERROR: this `MutexGuard` is held across an `await` point
+            //~^ ERROR: this `MutexGuard` is held across an await point
             baz().await
         };
 
@@ -79,7 +79,7 @@ mod std_mutex {
     pub fn block_bad(x: &Mutex<u32>) -> impl std::future::Future<Output = u32> + '_ {
         async move {
             let guard = x.lock().unwrap();
-            //~^ ERROR: this `MutexGuard` is held across an `await` point
+            //~^ ERROR: this `MutexGuard` is held across an await point
             baz().await
         }
     }
@@ -92,7 +92,7 @@ mod parking_lot_mutex {
 
     pub async fn bad(x: &Mutex<u32>) -> u32 {
         let guard = x.lock();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
         baz().await
     }
 
@@ -108,13 +108,13 @@ mod parking_lot_mutex {
 
     pub async fn bad_rw(x: &RwLock<u32>) -> u32 {
         let guard = x.read();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
         baz().await
     }
 
     pub async fn bad_rw_write(x: &RwLock<u32>) -> u32 {
         let mut guard = x.write();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
         baz().await
     }
 
@@ -136,7 +136,7 @@ mod parking_lot_mutex {
         let first = baz().await;
 
         let guard = x.lock();
-        //~^ ERROR: this `MutexGuard` is held across an `await` point
+        //~^ ERROR: this `MutexGuard` is held across an await point
 
         let second = baz().await;
 
@@ -150,7 +150,7 @@ mod parking_lot_mutex {
 
         let second = {
             let guard = x.lock();
-            //~^ ERROR: this `MutexGuard` is held across an `await` point
+            //~^ ERROR: this `MutexGuard` is held across an await point
             baz().await
         };
 
@@ -163,7 +163,7 @@ mod parking_lot_mutex {
     pub fn block_bad(x: &Mutex<u32>) -> impl std::future::Future<Output = u32> + '_ {
         async move {
             let guard = x.lock();
-            //~^ ERROR: this `MutexGuard` is held across an `await` point
+            //~^ ERROR: this `MutexGuard` is held across an await point
             baz().await
         }
     }
@@ -184,7 +184,7 @@ async fn no_await(x: std::sync::Mutex<u32>) {
 // `*guard += 1` is removed it is picked up.
 async fn dropped_before_await(x: std::sync::Mutex<u32>) {
     let mut guard = x.lock().unwrap();
-    //~^ ERROR: this `MutexGuard` is held across an `await` point
+    //~^ ERROR: this `MutexGuard` is held across an await point
     *guard += 1;
     drop(guard);
     baz().await;
diff --git a/src/tools/clippy/tests/ui/await_holding_lock.stderr b/src/tools/clippy/tests/ui/await_holding_lock.stderr
index 0af48a36acca1..af61d8939483f 100644
--- a/src/tools/clippy/tests/ui/await_holding_lock.stderr
+++ b/src/tools/clippy/tests/ui/await_holding_lock.stderr
@@ -1,11 +1,11 @@
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:10:13
    |
 LL |         let guard = x.lock().unwrap();
    |             ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:12:15
    |
 LL |         baz().await
@@ -13,40 +13,40 @@ LL |         baz().await
    = note: `-D clippy::await-holding-lock` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::await_holding_lock)]`
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:26:13
    |
 LL |         let guard = x.read().unwrap();
    |             ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:28:15
    |
 LL |         baz().await
    |               ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:32:13
    |
 LL |         let mut guard = x.write().unwrap();
    |             ^^^^^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:34:15
    |
 LL |         baz().await
    |               ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:54:13
    |
 LL |         let guard = x.lock().unwrap();
    |             ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:57:28
    |
 LL |         let second = baz().await;
@@ -55,79 +55,79 @@ LL |
 LL |         let third = baz().await;
    |                           ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:68:17
    |
 LL |             let guard = x.lock().unwrap();
    |                 ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:70:19
    |
 LL |             baz().await
    |                   ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:81:17
    |
 LL |             let guard = x.lock().unwrap();
    |                 ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:83:19
    |
 LL |             baz().await
    |                   ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:94:13
    |
 LL |         let guard = x.lock();
    |             ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:96:15
    |
 LL |         baz().await
    |               ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:110:13
    |
 LL |         let guard = x.read();
    |             ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:112:15
    |
 LL |         baz().await
    |               ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:116:13
    |
 LL |         let mut guard = x.write();
    |             ^^^^^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:118:15
    |
 LL |         baz().await
    |               ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:138:13
    |
 LL |         let guard = x.lock();
    |             ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:141:28
    |
 LL |         let second = baz().await;
@@ -136,40 +136,40 @@ LL |
 LL |         let third = baz().await;
    |                           ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:152:17
    |
 LL |             let guard = x.lock();
    |                 ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:154:19
    |
 LL |             baz().await
    |                   ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:165:17
    |
 LL |             let guard = x.lock();
    |                 ^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:167:19
    |
 LL |             baz().await
    |                   ^^^^^
 
-error: this `MutexGuard` is held across an `await` point
+error: this `MutexGuard` is held across an await point
   --> tests/ui/await_holding_lock.rs:186:9
    |
 LL |     let mut guard = x.lock().unwrap();
    |         ^^^^^^^^^
    |
-   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling await
-note: these are all the `await` points this lock is held through
+   = help: consider using an async-aware `Mutex` type or ensuring the `MutexGuard` is dropped before calling `await`
+note: these are all the await points this lock is held through
   --> tests/ui/await_holding_lock.rs:190:11
    |
 LL |     baz().await;
diff --git a/src/tools/clippy/tests/ui/await_holding_refcell_ref.rs b/src/tools/clippy/tests/ui/await_holding_refcell_ref.rs
index 5bd26c6283627..b0c92d8c1f6e6 100644
--- a/src/tools/clippy/tests/ui/await_holding_refcell_ref.rs
+++ b/src/tools/clippy/tests/ui/await_holding_refcell_ref.rs
@@ -4,13 +4,13 @@ use std::cell::RefCell;
 
 async fn bad(x: &RefCell<u32>) -> u32 {
     let b = x.borrow();
-    //~^ ERROR: this `RefCell` reference is held across an `await` point
+    //~^ ERROR: this `RefCell` reference is held across an await point
     baz().await
 }
 
 async fn bad_mut(x: &RefCell<u32>) -> u32 {
     let b = x.borrow_mut();
-    //~^ ERROR: this `RefCell` reference is held across an `await` point
+    //~^ ERROR: this `RefCell` reference is held across an await point
     baz().await
 }
 
@@ -32,7 +32,7 @@ async fn also_bad(x: &RefCell<u32>) -> u32 {
     let first = baz().await;
 
     let b = x.borrow_mut();
-    //~^ ERROR: this `RefCell` reference is held across an `await` point
+    //~^ ERROR: this `RefCell` reference is held across an await point
 
     let second = baz().await;
 
@@ -45,7 +45,7 @@ async fn less_bad(x: &RefCell<u32>) -> u32 {
     let first = baz().await;
 
     let b = x.borrow_mut();
-    //~^ ERROR: this `RefCell` reference is held across an `await` point
+    //~^ ERROR: this `RefCell` reference is held across an await point
 
     let second = baz().await;
 
@@ -61,7 +61,7 @@ async fn not_good(x: &RefCell<u32>) -> u32 {
 
     let second = {
         let b = x.borrow_mut();
-        //~^ ERROR: this `RefCell` reference is held across an `await` point
+        //~^ ERROR: this `RefCell` reference is held across an await point
         baz().await
     };
 
@@ -74,7 +74,7 @@ async fn not_good(x: &RefCell<u32>) -> u32 {
 fn block_bad(x: &RefCell<u32>) -> impl std::future::Future<Output = u32> + '_ {
     async move {
         let b = x.borrow_mut();
-        //~^ ERROR: this `RefCell` reference is held across an `await` point
+        //~^ ERROR: this `RefCell` reference is held across an await point
         baz().await
     }
 }
diff --git a/src/tools/clippy/tests/ui/await_holding_refcell_ref.stderr b/src/tools/clippy/tests/ui/await_holding_refcell_ref.stderr
index 6b474c27ddc18..6c7209c9ff9e7 100644
--- a/src/tools/clippy/tests/ui/await_holding_refcell_ref.stderr
+++ b/src/tools/clippy/tests/ui/await_holding_refcell_ref.stderr
@@ -1,11 +1,11 @@
-error: this `RefCell` reference is held across an `await` point
+error: this `RefCell` reference is held across an await point
   --> tests/ui/await_holding_refcell_ref.rs:6:9
    |
 LL |     let b = x.borrow();
    |         ^
    |
    = help: ensure the reference is dropped before calling `await`
-note: these are all the `await` points this reference is held through
+note: these are all the await points this reference is held through
   --> tests/ui/await_holding_refcell_ref.rs:8:11
    |
 LL |     baz().await
@@ -13,27 +13,27 @@ LL |     baz().await
    = note: `-D clippy::await-holding-refcell-ref` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::await_holding_refcell_ref)]`
 
-error: this `RefCell` reference is held across an `await` point
+error: this `RefCell` reference is held across an await point
   --> tests/ui/await_holding_refcell_ref.rs:12:9
    |
 LL |     let b = x.borrow_mut();
    |         ^
    |
    = help: ensure the reference is dropped before calling `await`
-note: these are all the `await` points this reference is held through
+note: these are all the await points this reference is held through
   --> tests/ui/await_holding_refcell_ref.rs:14:11
    |
 LL |     baz().await
    |           ^^^^^
 
-error: this `RefCell` reference is held across an `await` point
+error: this `RefCell` reference is held across an await point
   --> tests/ui/await_holding_refcell_ref.rs:34:9
    |
 LL |     let b = x.borrow_mut();
    |         ^
    |
    = help: ensure the reference is dropped before calling `await`
-note: these are all the `await` points this reference is held through
+note: these are all the await points this reference is held through
   --> tests/ui/await_holding_refcell_ref.rs:37:24
    |
 LL |     let second = baz().await;
@@ -42,40 +42,40 @@ LL |
 LL |     let third = baz().await;
    |                       ^^^^^
 
-error: this `RefCell` reference is held across an `await` point
+error: this `RefCell` reference is held across an await point
   --> tests/ui/await_holding_refcell_ref.rs:47:9
    |
 LL |     let b = x.borrow_mut();
    |         ^
    |
    = help: ensure the reference is dropped before calling `await`
-note: these are all the `await` points this reference is held through
+note: these are all the await points this reference is held through
   --> tests/ui/await_holding_refcell_ref.rs:50:24
    |
 LL |     let second = baz().await;
    |                        ^^^^^
 
-error: this `RefCell` reference is held across an `await` point
+error: this `RefCell` reference is held across an await point
   --> tests/ui/await_holding_refcell_ref.rs:63:13
    |
 LL |         let b = x.borrow_mut();
    |             ^
    |
    = help: ensure the reference is dropped before calling `await`
-note: these are all the `await` points this reference is held through
+note: these are all the await points this reference is held through
   --> tests/ui/await_holding_refcell_ref.rs:65:15
    |
 LL |         baz().await
    |               ^^^^^
 
-error: this `RefCell` reference is held across an `await` point
+error: this `RefCell` reference is held across an await point
   --> tests/ui/await_holding_refcell_ref.rs:76:13
    |
 LL |         let b = x.borrow_mut();
    |             ^
    |
    = help: ensure the reference is dropped before calling `await`
-note: these are all the `await` points this reference is held through
+note: these are all the await points this reference is held through
   --> tests/ui/await_holding_refcell_ref.rs:78:15
    |
 LL |         baz().await
diff --git a/src/tools/clippy/tests/ui/byte_char_slices.fixed b/src/tools/clippy/tests/ui/byte_char_slices.fixed
new file mode 100644
index 0000000000000..d1db58f9363e9
--- /dev/null
+++ b/src/tools/clippy/tests/ui/byte_char_slices.fixed
@@ -0,0 +1,13 @@
+#![allow(unused)]
+#![warn(clippy::byte_char_slices)]
+
+fn main() {
+    let bad = b"abc";
+    let quotes = b"\"Hi";
+    let quotes = b"'Sup";
+    let escapes = b"\x42Esc";
+
+    let good = &[b'a', 0x42];
+    let good = [b'a', b'a'];
+    let good: u8 = [b'a', b'c'].into_iter().sum();
+}
diff --git a/src/tools/clippy/tests/ui/byte_char_slices.rs b/src/tools/clippy/tests/ui/byte_char_slices.rs
new file mode 100644
index 0000000000000..18648fffceb40
--- /dev/null
+++ b/src/tools/clippy/tests/ui/byte_char_slices.rs
@@ -0,0 +1,13 @@
+#![allow(unused)]
+#![warn(clippy::byte_char_slices)]
+
+fn main() {
+    let bad = &[b'a', b'b', b'c'];
+    let quotes = &[b'"', b'H', b'i'];
+    let quotes = &[b'\'', b'S', b'u', b'p'];
+    let escapes = &[b'\x42', b'E', b's', b'c'];
+
+    let good = &[b'a', 0x42];
+    let good = vec![b'a', b'a'];
+    let good: u8 = [b'a', b'c'].into_iter().sum();
+}
diff --git a/src/tools/clippy/tests/ui/byte_char_slices.stderr b/src/tools/clippy/tests/ui/byte_char_slices.stderr
new file mode 100644
index 0000000000000..4e2b5d8a7329a
--- /dev/null
+++ b/src/tools/clippy/tests/ui/byte_char_slices.stderr
@@ -0,0 +1,38 @@
+error: can be more succinctly written as a byte str
+  --> tests/ui/byte_char_slices.rs:5:15
+   |
+LL |     let bad = &[b'a', b'b', b'c'];
+   |               ^^^^^^^^^^^^^^^^^^^ help: try: `b"abc"`
+   |
+   = note: `-D clippy::byte-char-slices` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::byte_char_slices)]`
+
+error: can be more succinctly written as a byte str
+  --> tests/ui/byte_char_slices.rs:6:18
+   |
+LL |     let quotes = &[b'"', b'H', b'i'];
+   |                  ^^^^^^^^^^^^^^^^^^^ help: try: `b"\"Hi"`
+
+error: can be more succinctly written as a byte str
+  --> tests/ui/byte_char_slices.rs:7:18
+   |
+LL |     let quotes = &[b'\'', b'S', b'u', b'p'];
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b"'Sup"`
+
+error: can be more succinctly written as a byte str
+  --> tests/ui/byte_char_slices.rs:8:19
+   |
+LL |     let escapes = &[b'\x42', b'E', b's', b'c'];
+   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b"\x42Esc"`
+
+error: useless use of `vec!`
+  --> tests/ui/byte_char_slices.rs:11:16
+   |
+LL |     let good = vec![b'a', b'a'];
+   |                ^^^^^^^^^^^^^^^^ help: you can use an array directly: `[b'a', b'a']`
+   |
+   = note: `-D clippy::useless-vec` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::useless_vec)]`
+
+error: aborting due to 5 previous errors
+
diff --git a/src/tools/clippy/tests/ui/cfg_not_test.rs b/src/tools/clippy/tests/ui/cfg_not_test.rs
new file mode 100644
index 0000000000000..da3e29d289662
--- /dev/null
+++ b/src/tools/clippy/tests/ui/cfg_not_test.rs
@@ -0,0 +1,32 @@
+#![allow(unused)]
+#![warn(clippy::cfg_not_test)]
+
+fn important_check() {}
+
+fn main() {
+    // Statement
+    #[cfg(not(test))]
+    let answer = 42;
+
+    // Expression
+    #[cfg(not(test))]
+    important_check();
+
+    // Make sure only not(test) are checked, not other attributes
+    #[cfg(not(foo))]
+    important_check();
+}
+
+#[cfg(not(not(test)))]
+struct CfgNotTest;
+
+// Deeply nested `not(test)`
+#[cfg(not(test))]
+fn foo() {}
+#[cfg(all(debug_assertions, not(test)))]
+fn bar() {}
+#[cfg(not(any(not(debug_assertions), test)))]
+fn baz() {}
+
+#[cfg(test)]
+mod tests {}
diff --git a/src/tools/clippy/tests/ui/cfg_not_test.stderr b/src/tools/clippy/tests/ui/cfg_not_test.stderr
new file mode 100644
index 0000000000000..c1bf626887afb
--- /dev/null
+++ b/src/tools/clippy/tests/ui/cfg_not_test.stderr
@@ -0,0 +1,45 @@
+error: code is excluded from test builds
+  --> tests/ui/cfg_not_test.rs:8:5
+   |
+LL |     #[cfg(not(test))]
+   |     ^^^^^^^^^^^^^^^^^
+   |
+   = help: consider not excluding any code from test builds
+   = note: this could increase code coverage despite not actually being tested
+   = note: `-D clippy::cfg-not-test` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::cfg_not_test)]`
+
+error: code is excluded from test builds
+  --> tests/ui/cfg_not_test.rs:12:5
+   |
+LL |     #[cfg(not(test))]
+   |     ^^^^^^^^^^^^^^^^^
+   |
+   = help: consider not excluding any code from test builds
+
+error: code is excluded from test builds
+  --> tests/ui/cfg_not_test.rs:24:1
+   |
+LL | #[cfg(not(test))]
+   | ^^^^^^^^^^^^^^^^^
+   |
+   = help: consider not excluding any code from test builds
+
+error: code is excluded from test builds
+  --> tests/ui/cfg_not_test.rs:26:1
+   |
+LL | #[cfg(all(debug_assertions, not(test)))]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: consider not excluding any code from test builds
+
+error: code is excluded from test builds
+  --> tests/ui/cfg_not_test.rs:28:1
+   |
+LL | #[cfg(not(any(not(debug_assertions), test)))]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: consider not excluding any code from test builds
+
+error: aborting due to 5 previous errors
+
diff --git a/src/tools/clippy/tests/ui/crashes/ice-12616.stderr b/src/tools/clippy/tests/ui/crashes/ice-12616.stderr
index c7cf5cf5483f7..a84a945a429ff 100644
--- a/src/tools/clippy/tests/ui/crashes/ice-12616.stderr
+++ b/src/tools/clippy/tests/ui/crashes/ice-12616.stderr
@@ -1,4 +1,4 @@
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/crashes/ice-12616.rs:6:5
    |
 LL |     s() as *const ();
diff --git a/src/tools/clippy/tests/ui/disallowed_names.rs b/src/tools/clippy/tests/ui/disallowed_names.rs
index 13c883409bf6e..96531bf8d88ca 100644
--- a/src/tools/clippy/tests/ui/disallowed_names.rs
+++ b/src/tools/clippy/tests/ui/disallowed_names.rs
@@ -60,6 +60,7 @@ fn issue_1647_ref_mut() {
     //~^ ERROR: use of a disallowed/placeholder name `quux`
 }
 
+#[cfg(test)]
 mod tests {
     fn issue_7305() {
         // `disallowed_names` lint should not be triggered inside of the test code.
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.fixed b/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.fixed
new file mode 100644
index 0000000000000..1aaa26afe7f26
--- /dev/null
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.fixed
@@ -0,0 +1,47 @@
+// https://github.com/rust-lang/rust-clippy/issues/12917
+#![warn(clippy::doc_lazy_continuation)]
+
+/// This is a constant.
+///
+/// The meaning of which should not be explained.
+pub const A: i32 = 42;
+
+/// This is another constant, no longer used.
+///
+/// This block of documentation has a long
+/// explanation and derivation to explain
+/// why it is what it is, and how it's used.
+///
+/// It is left here for historical reasons, and
+/// for reference.
+///
+/// Reasons it's great:
+///  - First reason
+///  - Second reason
+///
+//pub const B: i32 = 1337;
+
+/// This is yet another constant.
+///
+/// This has a similar fate as `B`.
+///
+/// Reasons it's useful:
+///  1. First reason
+///  2. Second reason
+///
+//pub const C: i32 = 8008;
+
+/// This is still in use.
+pub const D: i32 = 20;
+
+/// > blockquote code path
+///
+
+/// bottom text
+pub const E: i32 = 20;
+
+/// > blockquote code path
+///
+#[repr(C)]
+/// bottom text
+pub struct Foo(i32);
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.rs b/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.rs
new file mode 100644
index 0000000000000..e1ab8fc838926
--- /dev/null
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.rs
@@ -0,0 +1,43 @@
+// https://github.com/rust-lang/rust-clippy/issues/12917
+#![warn(clippy::doc_lazy_continuation)]
+
+/// This is a constant.
+///
+/// The meaning of which should not be explained.
+pub const A: i32 = 42;
+
+/// This is another constant, no longer used.
+///
+/// This block of documentation has a long
+/// explanation and derivation to explain
+/// why it is what it is, and how it's used.
+///
+/// It is left here for historical reasons, and
+/// for reference.
+///
+/// Reasons it's great:
+///  - First reason
+///  - Second reason
+//pub const B: i32 = 1337;
+
+/// This is yet another constant.
+///
+/// This has a similar fate as `B`.
+///
+/// Reasons it's useful:
+///  1. First reason
+///  2. Second reason
+//pub const C: i32 = 8008;
+
+/// This is still in use.
+pub const D: i32 = 20;
+
+/// > blockquote code path
+
+/// bottom text
+pub const E: i32 = 20;
+
+/// > blockquote code path
+#[repr(C)]
+/// bottom text
+pub struct Foo(i32);
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.stderr b/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.stderr
new file mode 100644
index 0000000000000..854906a747418
--- /dev/null
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_blank_line.stderr
@@ -0,0 +1,56 @@
+error: doc list item without indentation
+  --> tests/ui/doc/doc_lazy_blank_line.rs:23:5
+   |
+LL | /// This is yet another constant.
+   |     ^
+   |
+   = help: if this is intended to be part of the list, indent 3 spaces
+   = note: `-D clippy::doc-lazy-continuation` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::doc_lazy_continuation)]`
+help: if this should be its own paragraph, add a blank doc comment line
+   |
+LL ~ ///  - Second reason
+LL + ///
+   |
+
+error: doc list item without indentation
+  --> tests/ui/doc/doc_lazy_blank_line.rs:32:5
+   |
+LL | /// This is still in use.
+   |     ^
+   |
+   = help: if this is intended to be part of the list, indent 4 spaces
+help: if this should be its own paragraph, add a blank doc comment line
+   |
+LL ~ ///  2. Second reason
+LL + ///
+   |
+
+error: doc quote line without `>` marker
+  --> tests/ui/doc/doc_lazy_blank_line.rs:37:5
+   |
+LL | /// bottom text
+   |     ^
+   |
+   = help: if this not intended to be a quote at all, escape it with `\>`
+help: if this should be its own paragraph, add a blank doc comment line
+   |
+LL ~ /// > blockquote code path
+LL + ///
+   |
+
+error: doc quote line without `>` marker
+  --> tests/ui/doc/doc_lazy_blank_line.rs:42:5
+   |
+LL | /// bottom text
+   |     ^
+   |
+   = help: if this not intended to be a quote at all, escape it with `\>`
+help: if this should be its own paragraph, add a blank doc comment line
+   |
+LL ~ /// > blockquote code path
+LL + ///
+   |
+
+error: aborting due to 4 previous errors
+
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.fixed b/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.fixed
index 9877991f183a5..9d6e8637608fb 100644
--- a/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.fixed
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.fixed
@@ -2,7 +2,7 @@
 
 /// > blockquote with
 /// > lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn first() {}
 
 /// > blockquote with no
@@ -18,24 +18,24 @@ fn two_nowarn() {}
 /// >
 /// > > nest here
 /// > > lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn two() {}
 
 /// > nest here
 /// >
 /// > > nest here
 /// > > lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn three() {}
 
 /// >   * > nest here
 /// >     > lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn four() {}
 
 /// > * > nest here
 /// >   > lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn four_point_1() {}
 
 /// * > nest here lazy continuation
@@ -43,5 +43,5 @@ fn five() {}
 
 /// 1. > nest here
 ///    > lazy continuation (this results in strange indentation, but still works)
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn six() {}
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.rs b/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.rs
index 587b2fdd533ce..0323a1b44e7cc 100644
--- a/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.rs
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.rs
@@ -2,7 +2,7 @@
 
 /// > blockquote with
 /// lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn first() {}
 
 /// > blockquote with no
@@ -18,24 +18,24 @@ fn two_nowarn() {}
 /// >
 /// > > nest here
 /// > lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn two() {}
 
 /// > nest here
 /// >
 /// > > nest here
 /// lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn three() {}
 
 /// >   * > nest here
 /// lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn four() {}
 
 /// > * > nest here
 /// lazy continuation
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn four_point_1() {}
 
 /// * > nest here lazy continuation
@@ -43,5 +43,5 @@ fn five() {}
 
 /// 1. > nest here
 ///  lazy continuation (this results in strange indentation, but still works)
-//~^ ERROR: doc quote missing `>` marker
+//~^ ERROR: doc quote line without `>` marker
 fn six() {}
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.stderr b/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.stderr
index 975184a01c3f0..d3390efdff375 100644
--- a/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.stderr
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_blockquote.stderr
@@ -1,4 +1,4 @@
-error: doc quote missing `>` marker
+error: doc quote line without `>` marker
   --> tests/ui/doc/doc_lazy_blockquote.rs:4:5
    |
 LL | /// lazy continuation
@@ -12,7 +12,7 @@ help: add markers to start of line
 LL | /// > lazy continuation
    |     +
 
-error: doc quote missing `>` marker
+error: doc quote line without `>` marker
   --> tests/ui/doc/doc_lazy_blockquote.rs:20:5
    |
 LL | /// > lazy continuation
@@ -24,7 +24,7 @@ help: add markers to start of line
 LL | /// > > lazy continuation
    |       +
 
-error: doc quote missing `>` marker
+error: doc quote line without `>` marker
   --> tests/ui/doc/doc_lazy_blockquote.rs:27:5
    |
 LL | /// lazy continuation
@@ -36,7 +36,7 @@ help: add markers to start of line
 LL | /// > > lazy continuation
    |     +++
 
-error: doc quote missing `>` marker
+error: doc quote line without `>` marker
   --> tests/ui/doc/doc_lazy_blockquote.rs:32:5
    |
 LL | /// lazy continuation
@@ -48,7 +48,7 @@ help: add markers to start of line
 LL | /// >     > lazy continuation
    |     +++++++
 
-error: doc quote missing `>` marker
+error: doc quote line without `>` marker
   --> tests/ui/doc/doc_lazy_blockquote.rs:37:5
    |
 LL | /// lazy continuation
@@ -60,7 +60,7 @@ help: add markers to start of line
 LL | /// >   > lazy continuation
    |     +++++
 
-error: doc quote missing `>` marker
+error: doc quote line without `>` marker
   --> tests/ui/doc/doc_lazy_blockquote.rs:45:5
    |
 LL | ///  lazy continuation (this results in strange indentation, but still works)
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_list.fixed b/src/tools/clippy/tests/ui/doc/doc_lazy_list.fixed
index 409e6b0bc227f..ea59ae4c01c96 100644
--- a/src/tools/clippy/tests/ui/doc/doc_lazy_list.fixed
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_list.fixed
@@ -2,38 +2,41 @@
 
 /// 1. nest here
 ///    lazy continuation
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn one() {}
 
 /// 1. first line
 ///    lazy list continuations don't make warnings with this lint
-//~^ ERROR: doc list item missing indentation
-///    because they don't have the
-//~^ ERROR: doc list item missing indentation
+///
+//~^ ERROR: doc list item without indentation
+/// because they don't have the
+//~^ ERROR: doc list item without indentation
 fn two() {}
 
 ///   - nest here
 ///     lazy continuation
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn three() {}
 
 ///   - first line
 ///     lazy list continuations don't make warnings with this lint
-//~^ ERROR: doc list item missing indentation
-///     because they don't have the
-//~^ ERROR: doc list item missing indentation
+///
+//~^ ERROR: doc list item without indentation
+/// because they don't have the
+//~^ ERROR: doc list item without indentation
 fn four() {}
 
 ///   - nest here
 ///     lazy continuation
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn five() {}
 
 ///   - - first line
 ///       this will warn on the lazy continuation
-//~^ ERROR: doc list item missing indentation
-///       and so should this
-//~^ ERROR: doc list item missing indentation
+///
+//~^ ERROR: doc list item without indentation
+///     and so should this
+//~^ ERROR: doc list item without indentation
 fn six() {}
 
 ///   - - first line
@@ -54,7 +57,7 @@ fn seven() {}
 /// * `protocol_descriptors`: A Json Representation of the ProtocolDescriptors
 ///     to set up. Example:
 ///   'protocol_descriptors': [
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 ///      {
 ///          'protocol': 25,  # u64 Representation of ProtocolIdentifier::AVDTP
 ///          'params': [
@@ -73,5 +76,5 @@ fn seven() {}
 ///          }]
 ///      }
 ///   ]
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn eight() {}
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_list.rs b/src/tools/clippy/tests/ui/doc/doc_lazy_list.rs
index 30ab448a1130c..3cc18e35780a2 100644
--- a/src/tools/clippy/tests/ui/doc/doc_lazy_list.rs
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_list.rs
@@ -2,38 +2,38 @@
 
 /// 1. nest here
 /// lazy continuation
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn one() {}
 
 /// 1. first line
 /// lazy list continuations don't make warnings with this lint
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 /// because they don't have the
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn two() {}
 
 ///   - nest here
 /// lazy continuation
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn three() {}
 
 ///   - first line
 /// lazy list continuations don't make warnings with this lint
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 /// because they don't have the
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn four() {}
 
 ///   - nest here
 /// lazy continuation
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn five() {}
 
 ///   - - first line
 /// this will warn on the lazy continuation
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 ///     and so should this
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn six() {}
 
 ///   - - first line
@@ -54,7 +54,7 @@ fn seven() {}
 /// * `protocol_descriptors`: A Json Representation of the ProtocolDescriptors
 ///     to set up. Example:
 ///  'protocol_descriptors': [
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 ///      {
 ///          'protocol': 25,  # u64 Representation of ProtocolIdentifier::AVDTP
 ///          'params': [
@@ -73,5 +73,5 @@ fn seven() {}
 ///          }]
 ///      }
 ///  ]
-//~^ ERROR: doc list item missing indentation
+//~^ ERROR: doc list item without indentation
 fn eight() {}
diff --git a/src/tools/clippy/tests/ui/doc/doc_lazy_list.stderr b/src/tools/clippy/tests/ui/doc/doc_lazy_list.stderr
index ddfdc49340c45..52aa74df8948c 100644
--- a/src/tools/clippy/tests/ui/doc/doc_lazy_list.stderr
+++ b/src/tools/clippy/tests/ui/doc/doc_lazy_list.stderr
@@ -1,4 +1,4 @@
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:4:5
    |
 LL | /// lazy continuation
@@ -12,7 +12,7 @@ help: indent this line
 LL | ///    lazy continuation
    |     +++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:9:5
    |
 LL | /// lazy list continuations don't make warnings with this lint
@@ -24,19 +24,20 @@ help: indent this line
 LL | ///    lazy list continuations don't make warnings with this lint
    |     +++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:11:5
    |
 LL | /// because they don't have the
    |     ^
    |
-   = help: if this is supposed to be its own paragraph, add a blank line
-help: indent this line
+   = help: if this is intended to be part of the list, indent 3 spaces
+help: if this should be its own paragraph, add a blank doc comment line
+   |
+LL ~ /// lazy list continuations don't make warnings with this lint
+LL + ///
    |
-LL | ///    because they don't have the
-   |     +++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:16:5
    |
 LL | /// lazy continuation
@@ -48,7 +49,7 @@ help: indent this line
 LL | ///     lazy continuation
    |     ++++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:21:5
    |
 LL | /// lazy list continuations don't make warnings with this lint
@@ -60,19 +61,20 @@ help: indent this line
 LL | ///     lazy list continuations don't make warnings with this lint
    |     ++++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:23:5
    |
 LL | /// because they don't have the
    |     ^
    |
-   = help: if this is supposed to be its own paragraph, add a blank line
-help: indent this line
+   = help: if this is intended to be part of the list, indent 4 spaces
+help: if this should be its own paragraph, add a blank doc comment line
+   |
+LL ~ /// lazy list continuations don't make warnings with this lint
+LL + ///
    |
-LL | ///     because they don't have the
-   |     ++++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:28:5
    |
 LL | /// lazy continuation
@@ -84,7 +86,7 @@ help: indent this line
 LL | ///     lazy continuation
    |     ++++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:33:5
    |
 LL | /// this will warn on the lazy continuation
@@ -96,19 +98,20 @@ help: indent this line
 LL | ///       this will warn on the lazy continuation
    |     ++++++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:35:5
    |
 LL | ///     and so should this
    |     ^^^^
    |
-   = help: if this is supposed to be its own paragraph, add a blank line
-help: indent this line
+   = help: if this is intended to be part of the list, indent 2 spaces
+help: if this should be its own paragraph, add a blank doc comment line
+   |
+LL ~ /// this will warn on the lazy continuation
+LL + ///
    |
-LL | ///       and so should this
-   |         ++
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:56:5
    |
 LL | ///  'protocol_descriptors': [
@@ -120,7 +123,7 @@ help: indent this line
 LL | ///   'protocol_descriptors': [
    |      +
 
-error: doc list item missing indentation
+error: doc list item without indentation
   --> tests/ui/doc/doc_lazy_list.rs:75:5
    |
 LL | ///  ]
diff --git a/src/tools/clippy/tests/ui/doc/unbalanced_ticks.rs b/src/tools/clippy/tests/ui/doc/unbalanced_ticks.rs
index 6f7bab72040c8..04446787b6c29 100644
--- a/src/tools/clippy/tests/ui/doc/unbalanced_ticks.rs
+++ b/src/tools/clippy/tests/ui/doc/unbalanced_ticks.rs
@@ -49,3 +49,20 @@ fn other_markdown() {}
 ///   pub struct Struct;
 ///   ```
 fn issue_7421() {}
+
+/// `
+//~^ ERROR: backticks are unbalanced
+fn escape_0() {}
+
+/// Escaped \` backticks don't count.
+fn escape_1() {}
+
+/// Escaped \` \` backticks don't count.
+fn escape_2() {}
+
+/// Escaped \` ` backticks don't count, but unescaped backticks do.
+//~^ ERROR: backticks are unbalanced
+fn escape_3() {}
+
+/// Backslashes ` \` within code blocks don't count.
+fn escape_4() {}
diff --git a/src/tools/clippy/tests/ui/doc/unbalanced_ticks.stderr b/src/tools/clippy/tests/ui/doc/unbalanced_ticks.stderr
index 56ef291362318..50324010e97f7 100644
--- a/src/tools/clippy/tests/ui/doc/unbalanced_ticks.stderr
+++ b/src/tools/clippy/tests/ui/doc/unbalanced_ticks.stderr
@@ -78,5 +78,21 @@ help: try
 LL | /// - This item needs `backticks_here`
    |                       ~~~~~~~~~~~~~~~~
 
-error: aborting due to 8 previous errors
+error: backticks are unbalanced
+  --> tests/ui/doc/unbalanced_ticks.rs:53:5
+   |
+LL | /// `
+   |     ^
+   |
+   = help: a backtick may be missing a pair
+
+error: backticks are unbalanced
+  --> tests/ui/doc/unbalanced_ticks.rs:63:5
+   |
+LL | /// Escaped \` ` backticks don't count, but unescaped backticks do.
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: a backtick may be missing a pair
+
+error: aborting due to 10 previous errors
 
diff --git a/src/tools/clippy/tests/ui/explicit_auto_deref.fixed b/src/tools/clippy/tests/ui/explicit_auto_deref.fixed
index e6ca4bb66ccd3..255b2c5a220d8 100644
--- a/src/tools/clippy/tests/ui/explicit_auto_deref.fixed
+++ b/src/tools/clippy/tests/ui/explicit_auto_deref.fixed
@@ -345,3 +345,39 @@ fn main() {
         let _ = &mut ({ *x.u }).x;
     }
 }
+
+mod issue_12969 {
+    use std::ops::Deref;
+
+    struct Wrapper<T>(T);
+
+    impl<T> Deref for Wrapper<T> {
+        type Target = T;
+
+        fn deref(&self) -> &T {
+            &self.0
+        }
+    }
+
+    fn foo(_bar: &str) {}
+
+    fn bar() {
+        let wrapped_bar = Wrapper("");
+
+        foo(&wrapped_bar);
+    }
+}
+
+mod issue_9841 {
+    fn takes_array_ref<T, const N: usize>(array: &&[T; N]) {
+        takes_slice(*array)
+    }
+
+    fn takes_array_ref_ref<T, const N: usize>(array: &&&[T; N]) {
+        takes_slice(**array)
+    }
+
+    fn takes_slice<T>(slice: &[T]) {
+        todo!()
+    }
+}
diff --git a/src/tools/clippy/tests/ui/explicit_auto_deref.rs b/src/tools/clippy/tests/ui/explicit_auto_deref.rs
index 7531e1f87b71b..99906999f01d9 100644
--- a/src/tools/clippy/tests/ui/explicit_auto_deref.rs
+++ b/src/tools/clippy/tests/ui/explicit_auto_deref.rs
@@ -345,3 +345,39 @@ fn main() {
         let _ = &mut ({ *x.u }).x;
     }
 }
+
+mod issue_12969 {
+    use std::ops::Deref;
+
+    struct Wrapper<T>(T);
+
+    impl<T> Deref for Wrapper<T> {
+        type Target = T;
+
+        fn deref(&self) -> &T {
+            &self.0
+        }
+    }
+
+    fn foo(_bar: &str) {}
+
+    fn bar() {
+        let wrapped_bar = Wrapper("");
+
+        foo(&*wrapped_bar);
+    }
+}
+
+mod issue_9841 {
+    fn takes_array_ref<T, const N: usize>(array: &&[T; N]) {
+        takes_slice(*array)
+    }
+
+    fn takes_array_ref_ref<T, const N: usize>(array: &&&[T; N]) {
+        takes_slice(**array)
+    }
+
+    fn takes_slice<T>(slice: &[T]) {
+        todo!()
+    }
+}
diff --git a/src/tools/clippy/tests/ui/explicit_auto_deref.stderr b/src/tools/clippy/tests/ui/explicit_auto_deref.stderr
index 56a183de3487f..53784934f6386 100644
--- a/src/tools/clippy/tests/ui/explicit_auto_deref.stderr
+++ b/src/tools/clippy/tests/ui/explicit_auto_deref.stderr
@@ -271,5 +271,11 @@ error: deref which would be done by auto-deref
 LL |         let _ = &mut (*{ x.u }).x;
    |                      ^^^^^^^^^^ help: try: `{ x.u }`
 
-error: aborting due to 45 previous errors
+error: deref which would be done by auto-deref
+  --> tests/ui/explicit_auto_deref.rs:367:13
+   |
+LL |         foo(&*wrapped_bar);
+   |             ^^^^^^^^^^^^^ help: try: `&wrapped_bar`
+
+error: aborting due to 46 previous errors
 
diff --git a/src/tools/clippy/tests/ui/float_cmp.rs b/src/tools/clippy/tests/ui/float_cmp.rs
index 1923ad7c677e0..78dd2c6c01c3d 100644
--- a/src/tools/clippy/tests/ui/float_cmp.rs
+++ b/src/tools/clippy/tests/ui/float_cmp.rs
@@ -71,19 +71,16 @@ fn main() {
     twice(ONE) != ONE;
     ONE as f64 != 2.0;
     //~^ ERROR: strict comparison of `f32` or `f64`
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     ONE as f64 != 0.0; // no error, comparison with zero is ok
 
     let x: f64 = 1.0;
 
     x == 1.0;
     //~^ ERROR: strict comparison of `f32` or `f64`
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     x != 0f64; // no error, comparison with zero is ok
 
     twice(x) != twice(ONE as f64);
     //~^ ERROR: strict comparison of `f32` or `f64`
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
     x < 0.0; // no errors, lower or greater comparisons need no fuzzyness
     x > 0.0;
@@ -105,17 +102,14 @@ fn main() {
     ZERO_ARRAY[i] == NON_ZERO_ARRAY[j]; // ok, because lhs is zero regardless of i
     NON_ZERO_ARRAY[i] == NON_ZERO_ARRAY[j];
     //~^ ERROR: strict comparison of `f32` or `f64`
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
     let a1: [f32; 1] = [0.0];
     let a2: [f32; 1] = [1.1];
 
     a1 == a2;
     //~^ ERROR: strict comparison of `f32` or `f64` arrays
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     a1[0] == a2[0];
     //~^ ERROR: strict comparison of `f32` or `f64`
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
     // no errors - comparing signums is ok
     let x32 = 3.21f32;
diff --git a/src/tools/clippy/tests/ui/float_cmp.stderr b/src/tools/clippy/tests/ui/float_cmp.stderr
index c8a0bde6e63a8..d10da8a99a9d8 100644
--- a/src/tools/clippy/tests/ui/float_cmp.stderr
+++ b/src/tools/clippy/tests/ui/float_cmp.stderr
@@ -4,49 +4,38 @@ error: strict comparison of `f32` or `f64`
 LL |     ONE as f64 != 2.0;
    |     ^^^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(ONE as f64 - 2.0).abs() > error_margin`
    |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
    = note: `-D clippy::float-cmp` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::float_cmp)]`
 
 error: strict comparison of `f32` or `f64`
-  --> tests/ui/float_cmp.rs:79:5
+  --> tests/ui/float_cmp.rs:78:5
    |
 LL |     x == 1.0;
    |     ^^^^^^^^ help: consider comparing them within some margin of error: `(x - 1.0).abs() < error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64`
-  --> tests/ui/float_cmp.rs:84:5
+  --> tests/ui/float_cmp.rs:82:5
    |
 LL |     twice(x) != twice(ONE as f64);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(twice(x) - twice(ONE as f64)).abs() > error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64`
-  --> tests/ui/float_cmp.rs:106:5
+  --> tests/ui/float_cmp.rs:103:5
    |
 LL |     NON_ZERO_ARRAY[i] == NON_ZERO_ARRAY[j];
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(NON_ZERO_ARRAY[i] - NON_ZERO_ARRAY[j]).abs() < error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64` arrays
-  --> tests/ui/float_cmp.rs:113:5
+  --> tests/ui/float_cmp.rs:109:5
    |
 LL |     a1 == a2;
    |     ^^^^^^^^
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64`
-  --> tests/ui/float_cmp.rs:116:5
+  --> tests/ui/float_cmp.rs:111:5
    |
 LL |     a1[0] == a2[0];
    |     ^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(a1[0] - a2[0]).abs() < error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: aborting due to 6 previous errors
 
diff --git a/src/tools/clippy/tests/ui/float_cmp_const.rs b/src/tools/clippy/tests/ui/float_cmp_const.rs
index 47ea0e19c68b9..0818055643734 100644
--- a/src/tools/clippy/tests/ui/float_cmp_const.rs
+++ b/src/tools/clippy/tests/ui/float_cmp_const.rs
@@ -15,28 +15,21 @@ fn main() {
     // has errors
     1f32 == ONE;
     //~^ ERROR: strict comparison of `f32` or `f64` constant
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     TWO == ONE;
     //~^ ERROR: strict comparison of `f32` or `f64` constant
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     TWO != ONE;
     //~^ ERROR: strict comparison of `f32` or `f64` constant
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     ONE + ONE == TWO;
     //~^ ERROR: strict comparison of `f32` or `f64` constant
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     let x = 1;
     x as f32 == ONE;
     //~^ ERROR: strict comparison of `f32` or `f64` constant
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
     let v = 0.9;
     v == ONE;
     //~^ ERROR: strict comparison of `f32` or `f64` constant
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
     v != ONE;
     //~^ ERROR: strict comparison of `f32` or `f64` constant
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
     // no errors, lower than or greater than comparisons
     v < ONE;
@@ -70,5 +63,4 @@ fn main() {
     // has errors
     NON_ZERO_ARRAY == NON_ZERO_ARRAY2;
     //~^ ERROR: strict comparison of `f32` or `f64` constant arrays
-    //~| NOTE: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 }
diff --git a/src/tools/clippy/tests/ui/float_cmp_const.stderr b/src/tools/clippy/tests/ui/float_cmp_const.stderr
index bffd2acc2e049..4f88746e958e2 100644
--- a/src/tools/clippy/tests/ui/float_cmp_const.stderr
+++ b/src/tools/clippy/tests/ui/float_cmp_const.stderr
@@ -4,65 +4,50 @@ error: strict comparison of `f32` or `f64` constant
 LL |     1f32 == ONE;
    |     ^^^^^^^^^^^ help: consider comparing them within some margin of error: `(1f32 - ONE).abs() < error_margin`
    |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
    = note: `-D clippy::float-cmp-const` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::float_cmp_const)]`
 
 error: strict comparison of `f32` or `f64` constant
-  --> tests/ui/float_cmp_const.rs:19:5
+  --> tests/ui/float_cmp_const.rs:18:5
    |
 LL |     TWO == ONE;
    |     ^^^^^^^^^^ help: consider comparing them within some margin of error: `(TWO - ONE).abs() < error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64` constant
-  --> tests/ui/float_cmp_const.rs:22:5
+  --> tests/ui/float_cmp_const.rs:20:5
    |
 LL |     TWO != ONE;
    |     ^^^^^^^^^^ help: consider comparing them within some margin of error: `(TWO - ONE).abs() > error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64` constant
-  --> tests/ui/float_cmp_const.rs:25:5
+  --> tests/ui/float_cmp_const.rs:22:5
    |
 LL |     ONE + ONE == TWO;
    |     ^^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(ONE + ONE - TWO).abs() < error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64` constant
-  --> tests/ui/float_cmp_const.rs:29:5
+  --> tests/ui/float_cmp_const.rs:25:5
    |
 LL |     x as f32 == ONE;
    |     ^^^^^^^^^^^^^^^ help: consider comparing them within some margin of error: `(x as f32 - ONE).abs() < error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64` constant
-  --> tests/ui/float_cmp_const.rs:34:5
+  --> tests/ui/float_cmp_const.rs:29:5
    |
 LL |     v == ONE;
    |     ^^^^^^^^ help: consider comparing them within some margin of error: `(v - ONE).abs() < error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64` constant
-  --> tests/ui/float_cmp_const.rs:37:5
+  --> tests/ui/float_cmp_const.rs:31:5
    |
 LL |     v != ONE;
    |     ^^^^^^^^ help: consider comparing them within some margin of error: `(v - ONE).abs() > error_margin`
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: strict comparison of `f32` or `f64` constant arrays
-  --> tests/ui/float_cmp_const.rs:71:5
+  --> tests/ui/float_cmp_const.rs:64:5
    |
 LL |     NON_ZERO_ARRAY == NON_ZERO_ARRAY2;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: `f32::EPSILON` and `f64::EPSILON` are available for the `error_margin`
 
 error: aborting due to 8 previous errors
 
diff --git a/src/tools/clippy/tests/ui/numbered_fields.fixed b/src/tools/clippy/tests/ui/init_numbered_fields.fixed
similarity index 82%
rename from src/tools/clippy/tests/ui/numbered_fields.fixed
rename to src/tools/clippy/tests/ui/init_numbered_fields.fixed
index 108520eed38d5..dca4e8da4d2f7 100644
--- a/src/tools/clippy/tests/ui/numbered_fields.fixed
+++ b/src/tools/clippy/tests/ui/init_numbered_fields.fixed
@@ -39,4 +39,13 @@ fn main() {
     struct TupleStructVec(Vec<usize>);
 
     let _ = TupleStructVec(vec![0, 1, 2, 3]);
+
+    {
+        struct S(i32, i32);
+        let mut iter = [1i32, 1i32].into_iter();
+        let _ = S {
+            1: iter.next().unwrap(),
+            0: iter.next().unwrap(),
+        };
+    }
 }
diff --git a/src/tools/clippy/tests/ui/numbered_fields.rs b/src/tools/clippy/tests/ui/init_numbered_fields.rs
similarity index 84%
rename from src/tools/clippy/tests/ui/numbered_fields.rs
rename to src/tools/clippy/tests/ui/init_numbered_fields.rs
index c718661a68263..8cb34705b4f67 100644
--- a/src/tools/clippy/tests/ui/numbered_fields.rs
+++ b/src/tools/clippy/tests/ui/init_numbered_fields.rs
@@ -47,4 +47,13 @@ fn main() {
     struct TupleStructVec(Vec<usize>);
 
     let _ = TupleStructVec { 0: vec![0, 1, 2, 3] };
+
+    {
+        struct S(i32, i32);
+        let mut iter = [1i32, 1i32].into_iter();
+        let _ = S {
+            1: iter.next().unwrap(),
+            0: iter.next().unwrap(),
+        };
+    }
 }
diff --git a/src/tools/clippy/tests/ui/numbered_fields.stderr b/src/tools/clippy/tests/ui/init_numbered_fields.stderr
similarity index 63%
rename from src/tools/clippy/tests/ui/numbered_fields.stderr
rename to src/tools/clippy/tests/ui/init_numbered_fields.stderr
index 9d3f59cd3769e..f176e0c2ff301 100644
--- a/src/tools/clippy/tests/ui/numbered_fields.stderr
+++ b/src/tools/clippy/tests/ui/init_numbered_fields.stderr
@@ -1,5 +1,5 @@
 error: used a field initializer for a tuple struct
-  --> tests/ui/numbered_fields.rs:17:13
+  --> tests/ui/init_numbered_fields.rs:17:13
    |
 LL |       let _ = TupleStruct {
    |  _____________^
@@ -7,13 +7,13 @@ LL | |         0: 1u32,
 LL | |         1: 42,
 LL | |         2: 23u8,
 LL | |     };
-   | |_____^ help: try: `TupleStruct(1u32, 42, 23u8)`
+   | |_____^ help: use tuple initialization: `TupleStruct(1u32, 42, 23u8)`
    |
    = note: `-D clippy::init-numbered-fields` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::init_numbered_fields)]`
 
 error: used a field initializer for a tuple struct
-  --> tests/ui/numbered_fields.rs:24:13
+  --> tests/ui/init_numbered_fields.rs:24:13
    |
 LL |       let _ = TupleStruct {
    |  _____________^
@@ -21,13 +21,13 @@ LL | |         0: 1u32,
 LL | |         2: 2u8,
 LL | |         1: 3u32,
 LL | |     };
-   | |_____^ help: try: `TupleStruct(1u32, 3u32, 2u8)`
+   | |_____^ help: use tuple initialization: `TupleStruct(1u32, 3u32, 2u8)`
 
 error: used a field initializer for a tuple struct
-  --> tests/ui/numbered_fields.rs:49:13
+  --> tests/ui/init_numbered_fields.rs:49:13
    |
 LL |     let _ = TupleStructVec { 0: vec![0, 1, 2, 3] };
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `TupleStructVec(vec![0, 1, 2, 3])`
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use tuple initialization: `TupleStructVec(vec![0, 1, 2, 3])`
 
 error: aborting due to 3 previous errors
 
diff --git a/src/tools/clippy/tests/ui/into_iter_without_iter.rs b/src/tools/clippy/tests/ui/into_iter_without_iter.rs
index c8b9076041a31..109259d6975c7 100644
--- a/src/tools/clippy/tests/ui/into_iter_without_iter.rs
+++ b/src/tools/clippy/tests/ui/into_iter_without_iter.rs
@@ -185,3 +185,42 @@ pub mod issue11635 {
         }
     }
 }
+
+pub mod issue12964 {
+    pub struct MyIter<'a, T: 'a> {
+        iter: std::slice::Iter<'a, T>,
+    }
+
+    impl<'a, T> Iterator for MyIter<'a, T> {
+        type Item = &'a T;
+
+        fn next(&mut self) -> Option<Self::Item> {
+            self.iter.next()
+        }
+    }
+
+    pub struct MyContainer<T> {
+        inner: Vec<T>,
+    }
+
+    impl<T> MyContainer<T> {}
+
+    impl<T> MyContainer<T> {
+        #[must_use]
+        pub fn iter(&self) -> MyIter<'_, T> {
+            <&Self as IntoIterator>::into_iter(self)
+        }
+    }
+
+    impl<'a, T> IntoIterator for &'a MyContainer<T> {
+        type Item = &'a T;
+
+        type IntoIter = MyIter<'a, T>;
+
+        fn into_iter(self) -> Self::IntoIter {
+            Self::IntoIter {
+                iter: self.inner.as_slice().iter(),
+            }
+        }
+    }
+}
diff --git a/src/tools/clippy/tests/ui/iter_next_loop.rs b/src/tools/clippy/tests/ui/iter_next_loop.rs
index 548b799de44e8..d425f4da0e81d 100644
--- a/src/tools/clippy/tests/ui/iter_next_loop.rs
+++ b/src/tools/clippy/tests/ui/iter_next_loop.rs
@@ -3,7 +3,7 @@
 
 fn main() {
     let x = [1, 2, 3, 4];
-    for _ in vec.iter().next() {}
+    for _ in x.iter().next() {}
 
     struct Unrelated(&'static [u8]);
     impl Unrelated {
diff --git a/src/tools/clippy/tests/ui/iter_next_loop.stderr b/src/tools/clippy/tests/ui/iter_next_loop.stderr
index 85c23f4e70944..acc55031c3b29 100644
--- a/src/tools/clippy/tests/ui/iter_next_loop.stderr
+++ b/src/tools/clippy/tests/ui/iter_next_loop.stderr
@@ -1,9 +1,11 @@
-error[E0423]: expected value, found macro `vec`
+error: you are iterating over `Iterator::next()` which is an Option; this will compile but is probably not what you want
   --> tests/ui/iter_next_loop.rs:6:14
    |
-LL |     for _ in vec.iter().next() {}
-   |              ^^^ not a value
+LL |     for _ in x.iter().next() {}
+   |              ^^^^^^^^^^^^^^^
+   |
+   = note: `-D clippy::iter-next-loop` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::iter_next_loop)]`
 
 error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0423`.
diff --git a/src/tools/clippy/tests/ui/manual_inspect.stderr b/src/tools/clippy/tests/ui/manual_inspect.stderr
index 8548c0cd29424..0559b3bd6611d 100644
--- a/src/tools/clippy/tests/ui/manual_inspect.stderr
+++ b/src/tools/clippy/tests/ui/manual_inspect.stderr
@@ -1,4 +1,4 @@
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:5:21
    |
 LL |     let _ = Some(0).map(|x| {
@@ -12,7 +12,7 @@ LL ~     let _ = Some(0).inspect(|&x| {
 LL ~         println!("{}", x);
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:10:21
    |
 LL |     let _ = Some(0).map(|x| {
@@ -24,7 +24,7 @@ LL ~     let _ = Some(0).inspect(|&x| {
 LL ~         println!("{x}");
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:15:21
    |
 LL |     let _ = Some(0).map(|x| {
@@ -36,7 +36,7 @@ LL ~     let _ = Some(0).inspect(|&x| {
 LL ~         println!("{}", x * 5 + 1);
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:20:21
    |
 LL |     let _ = Some(0).map(|x| {
@@ -50,7 +50,7 @@ LL |             panic!();
 LL ~         }
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:27:21
    |
 LL |     let _ = Some(0).map(|x| {
@@ -65,7 +65,7 @@ LL |             panic!();
 LL ~         }
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:78:41
    |
 LL |     let _ = Some((String::new(), 0u32)).map(|x| {
@@ -80,7 +80,7 @@ LL |             panic!();
 LL ~         }
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:104:33
    |
 LL |     let _ = Some(String::new()).map(|x| {
@@ -98,7 +98,7 @@ LL |         }
 LL ~         println!("test");
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:115:21
    |
 LL |     let _ = Some(0).map(|x| {
@@ -113,7 +113,7 @@ LL |             panic!();
 LL ~         }
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:130:46
    |
 LL |         let _ = Some(Cell2(Cell::new(0u32))).map(|x| {
@@ -125,7 +125,7 @@ LL ~         let _ = Some(Cell2(Cell::new(0u32))).inspect(|x| {
 LL ~             x.0.set(1);
    |
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:146:34
    |
 LL |     let _: Result<_, ()> = Ok(0).map(|x| {
@@ -137,7 +137,7 @@ LL ~     let _: Result<_, ()> = Ok(0).inspect(|&x| {
 LL ~         println!("{}", x);
    |
 
-error: 
+error: using `map_err` over `inspect_err`
   --> tests/ui/manual_inspect.rs:151:35
    |
 LL |     let _: Result<(), _> = Err(0).map_err(|x| {
@@ -166,7 +166,7 @@ LL | |         .count();
    = note: `-D clippy::suspicious-map` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::suspicious_map)]`
 
-error: 
+error: using `map` over `inspect`
   --> tests/ui/manual_inspect.rs:158:10
    |
 LL |         .map(|x| {
diff --git a/src/tools/clippy/tests/ui/manual_rotate.fixed b/src/tools/clippy/tests/ui/manual_rotate.fixed
new file mode 100644
index 0000000000000..5d33838a31877
--- /dev/null
+++ b/src/tools/clippy/tests/ui/manual_rotate.fixed
@@ -0,0 +1,31 @@
+#![warn(clippy::manual_rotate)]
+#![allow(unused)]
+fn main() {
+    let (x_u8, x_u16, x_u32, x_u64) = (1u8, 1u16, 1u32, 1u64);
+    let (x_i8, x_i16, x_i32, x_i64) = (1i8, 1i16, 1i32, 1i64);
+    let a_u32 = 1u32;
+    // True positives
+    let y_u8 = x_u8.rotate_right(3);
+    let y_u16 = x_u16.rotate_right(7);
+    let y_u32 = x_u32.rotate_right(8);
+    let y_u64 = x_u64.rotate_right(9);
+    let y_i8 = x_i8.rotate_right(3);
+    let y_i16 = x_i16.rotate_right(7);
+    let y_i32 = x_i32.rotate_right(8);
+    let y_i64 = x_i64.rotate_right(9);
+    // Plus also works instead of |
+    let y_u32_plus = x_u32.rotate_right(8);
+    // Complex expression
+    let y_u32_complex = (x_u32 | 3256).rotate_right(8);
+    let y_u64_as = (x_u32 as u64).rotate_right(8);
+
+    // False positives - can't be replaced with a rotation
+    let y_u8_false = (x_u8 >> 6) | (x_u8 << 3);
+    let y_u32_false = (x_u32 >> 8) | (x_u32 >> 24);
+    let y_u64_false2 = (x_u64 >> 9) & (x_u64 << 55);
+    // Variable mismatch
+    let y_u32_wrong_vars = (x_u32 >> 8) | (a_u32 << 24);
+    // Has side effects and therefore should not be matched
+    let mut l = vec![12_u8, 34];
+    let y = (l.pop().unwrap() << 3) + (l.pop().unwrap() >> 5);
+}
diff --git a/src/tools/clippy/tests/ui/manual_rotate.rs b/src/tools/clippy/tests/ui/manual_rotate.rs
new file mode 100644
index 0000000000000..5377491fb1a38
--- /dev/null
+++ b/src/tools/clippy/tests/ui/manual_rotate.rs
@@ -0,0 +1,31 @@
+#![warn(clippy::manual_rotate)]
+#![allow(unused)]
+fn main() {
+    let (x_u8, x_u16, x_u32, x_u64) = (1u8, 1u16, 1u32, 1u64);
+    let (x_i8, x_i16, x_i32, x_i64) = (1i8, 1i16, 1i32, 1i64);
+    let a_u32 = 1u32;
+    // True positives
+    let y_u8 = (x_u8 >> 3) | (x_u8 << 5);
+    let y_u16 = (x_u16 >> 7) | (x_u16 << 9);
+    let y_u32 = (x_u32 >> 8) | (x_u32 << 24);
+    let y_u64 = (x_u64 >> 9) | (x_u64 << 55);
+    let y_i8 = (x_i8 >> 3) | (x_i8 << 5);
+    let y_i16 = (x_i16 >> 7) | (x_i16 << 9);
+    let y_i32 = (x_i32 >> 8) | (x_i32 << 24);
+    let y_i64 = (x_i64 >> 9) | (x_i64 << 55);
+    // Plus also works instead of |
+    let y_u32_plus = (x_u32 >> 8) + (x_u32 << 24);
+    // Complex expression
+    let y_u32_complex = ((x_u32 | 3256) >> 8) | ((x_u32 | 3256) << 24);
+    let y_u64_as = (x_u32 as u64 >> 8) | ((x_u32 as u64) << 56);
+
+    // False positives - can't be replaced with a rotation
+    let y_u8_false = (x_u8 >> 6) | (x_u8 << 3);
+    let y_u32_false = (x_u32 >> 8) | (x_u32 >> 24);
+    let y_u64_false2 = (x_u64 >> 9) & (x_u64 << 55);
+    // Variable mismatch
+    let y_u32_wrong_vars = (x_u32 >> 8) | (a_u32 << 24);
+    // Has side effects and therefore should not be matched
+    let mut l = vec![12_u8, 34];
+    let y = (l.pop().unwrap() << 3) + (l.pop().unwrap() >> 5);
+}
diff --git a/src/tools/clippy/tests/ui/manual_rotate.stderr b/src/tools/clippy/tests/ui/manual_rotate.stderr
new file mode 100644
index 0000000000000..52da0861f7003
--- /dev/null
+++ b/src/tools/clippy/tests/ui/manual_rotate.stderr
@@ -0,0 +1,71 @@
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:8:16
+   |
+LL |     let y_u8 = (x_u8 >> 3) | (x_u8 << 5);
+   |                ^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_u8.rotate_right(3)`
+   |
+   = note: `-D clippy::manual-rotate` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::manual_rotate)]`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:9:17
+   |
+LL |     let y_u16 = (x_u16 >> 7) | (x_u16 << 9);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_u16.rotate_right(7)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:10:17
+   |
+LL |     let y_u32 = (x_u32 >> 8) | (x_u32 << 24);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_u32.rotate_right(8)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:11:17
+   |
+LL |     let y_u64 = (x_u64 >> 9) | (x_u64 << 55);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_u64.rotate_right(9)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:12:16
+   |
+LL |     let y_i8 = (x_i8 >> 3) | (x_i8 << 5);
+   |                ^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_i8.rotate_right(3)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:13:17
+   |
+LL |     let y_i16 = (x_i16 >> 7) | (x_i16 << 9);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_i16.rotate_right(7)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:14:17
+   |
+LL |     let y_i32 = (x_i32 >> 8) | (x_i32 << 24);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_i32.rotate_right(8)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:15:17
+   |
+LL |     let y_i64 = (x_i64 >> 9) | (x_i64 << 55);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_i64.rotate_right(9)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:17:22
+   |
+LL |     let y_u32_plus = (x_u32 >> 8) + (x_u32 << 24);
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `x_u32.rotate_right(8)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:19:25
+   |
+LL |     let y_u32_complex = ((x_u32 | 3256) >> 8) | ((x_u32 | 3256) << 24);
+   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `(x_u32 | 3256).rotate_right(8)`
+
+error: there is no need to manually implement bit rotation
+  --> tests/ui/manual_rotate.rs:20:20
+   |
+LL |     let y_u64_as = (x_u32 as u64 >> 8) | ((x_u32 as u64) << 56);
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: this expression can be rewritten as: `(x_u32 as u64).rotate_right(8)`
+
+error: aborting due to 11 previous errors
+
diff --git a/src/tools/clippy/tests/ui/missing_const_for_fn/cant_be_const.rs b/src/tools/clippy/tests/ui/missing_const_for_fn/cant_be_const.rs
index 2750e0cdf3f70..2c6e1e92da025 100644
--- a/src/tools/clippy/tests/ui/missing_const_for_fn/cant_be_const.rs
+++ b/src/tools/clippy/tests/ui/missing_const_for_fn/cant_be_const.rs
@@ -7,6 +7,7 @@
 
 #![warn(clippy::missing_const_for_fn)]
 #![feature(start)]
+#![feature(type_alias_impl_trait)]
 
 extern crate helper;
 extern crate proc_macros;
@@ -180,4 +181,21 @@ mod msrv {
             unsafe { *self.1 as usize }
         }
     }
+
+    #[clippy::msrv = "1.61"]
+    extern "C" fn c() {}
+}
+
+mod with_extern {
+    extern "C-unwind" fn c_unwind() {}
+    extern "system" fn system() {}
+    extern "system-unwind" fn system_unwind() {}
+}
+
+mod with_ty_alias {
+    type Foo = impl std::fmt::Debug;
+
+    fn foo(_: Foo) {
+        let _: Foo = 1;
+    }
 }
diff --git a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.fixed b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.fixed
index f8fc935f3679d..dbd739eee1389 100644
--- a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.fixed
+++ b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.fixed
@@ -143,6 +143,21 @@ mod msrv {
         let bar = Bar { val: 1 };
         let _ = unsafe { bar.val };
     }
+
+    #[clippy::msrv = "1.62"]
+    mod with_extern {
+        const extern "C" fn c() {}
+        //~^ ERROR: this could be a `const fn`
+
+        #[rustfmt::skip]
+        const extern fn implicit_c() {}
+        //~^ ERROR: this could be a `const fn`
+
+        // any item functions in extern block won't trigger this lint
+        extern "C" {
+            fn c_in_block();
+        }
+    }
 }
 
 mod issue12677 {
@@ -174,3 +189,18 @@ mod issue12677 {
         }
     }
 }
+
+mod with_ty_alias {
+    trait FooTrait {
+        type Foo: std::fmt::Debug;
+        fn bar(_: Self::Foo) {}
+    }
+    impl FooTrait for () {
+        type Foo = i32;
+    }
+    // NOTE: When checking the type of a function param, make sure it is not an alias with
+    // `AliasTyKind::Projection` before calling `TyCtxt::type_of` to find out what the actual type
+    // is. Because the associate ty could have no default, therefore would cause ICE, as demostrated
+    // in this test.
+    const fn alias_ty_is_projection(bar: <() as FooTrait>::Foo) {}
+}
diff --git a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.rs b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.rs
index 5e4e2c58e5a4d..4ac56f4c80348 100644
--- a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.rs
+++ b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.rs
@@ -143,6 +143,21 @@ mod msrv {
         let bar = Bar { val: 1 };
         let _ = unsafe { bar.val };
     }
+
+    #[clippy::msrv = "1.62"]
+    mod with_extern {
+        extern "C" fn c() {}
+        //~^ ERROR: this could be a `const fn`
+
+        #[rustfmt::skip]
+        extern fn implicit_c() {}
+        //~^ ERROR: this could be a `const fn`
+
+        // any item functions in extern block won't trigger this lint
+        extern "C" {
+            fn c_in_block();
+        }
+    }
 }
 
 mod issue12677 {
@@ -174,3 +189,18 @@ mod issue12677 {
         }
     }
 }
+
+mod with_ty_alias {
+    trait FooTrait {
+        type Foo: std::fmt::Debug;
+        fn bar(_: Self::Foo) {}
+    }
+    impl FooTrait for () {
+        type Foo = i32;
+    }
+    // NOTE: When checking the type of a function param, make sure it is not an alias with
+    // `AliasTyKind::Projection` before calling `TyCtxt::type_of` to find out what the actual type
+    // is. Because the associate ty could have no default, therefore would cause ICE, as demostrated
+    // in this test.
+    fn alias_ty_is_projection(bar: <() as FooTrait>::Foo) {}
+}
diff --git a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.stderr b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.stderr
index 8302b074127e6..fb4db70310316 100644
--- a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.stderr
+++ b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const.stderr
@@ -211,7 +211,29 @@ LL |     const fn union_access_can_be_const() {
    |     +++++
 
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const.rs:155:9
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:149:9
+   |
+LL |         extern "C" fn c() {}
+   |         ^^^^^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL |         const extern "C" fn c() {}
+   |         +++++
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:153:9
+   |
+LL |         extern fn implicit_c() {}
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL |         const extern fn implicit_c() {}
+   |         +++++
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:170:9
    |
 LL | /         pub fn new(strings: Vec<String>) -> Self {
 LL | |             Self { strings }
@@ -224,7 +246,7 @@ LL |         pub const fn new(strings: Vec<String>) -> Self {
    |             +++++
 
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const.rs:160:9
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:175:9
    |
 LL | /         pub fn empty() -> Self {
 LL | |             Self { strings: Vec::new() }
@@ -237,7 +259,7 @@ LL |         pub const fn empty() -> Self {
    |             +++++
 
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const.rs:171:9
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:186:9
    |
 LL | /         pub fn new(text: String) -> Self {
 LL | |             let vec = Vec::new();
@@ -250,5 +272,16 @@ help: make the function `const`
 LL |         pub const fn new(text: String) -> Self {
    |             +++++
 
-error: aborting due to 18 previous errors
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:205:5
+   |
+LL |     fn alias_ty_is_projection(bar: <() as FooTrait>::Foo) {}
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL |     const fn alias_ty_is_projection(bar: <() as FooTrait>::Foo) {}
+   |     +++++
+
+error: aborting due to 21 previous errors
 
diff --git a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.fixed b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.fixed
new file mode 100644
index 0000000000000..c103db536ab50
--- /dev/null
+++ b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.fixed
@@ -0,0 +1,14 @@
+#![warn(clippy::missing_const_for_fn)]
+#![allow(unsupported_calling_conventions)]
+#![feature(const_extern_fn)]
+
+const extern "C-unwind" fn c_unwind() {}
+//~^ ERROR: this could be a `const fn`
+const extern "system" fn system() {}
+//~^ ERROR: this could be a `const fn`
+const extern "system-unwind" fn system_unwind() {}
+//~^ ERROR: this could be a `const fn`
+pub const extern "stdcall" fn std_call() {}
+//~^ ERROR: this could be a `const fn`
+pub const extern "stdcall-unwind" fn std_call_unwind() {}
+//~^ ERROR: this could be a `const fn`
diff --git a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs
new file mode 100644
index 0000000000000..0f7020ae559a9
--- /dev/null
+++ b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs
@@ -0,0 +1,14 @@
+#![warn(clippy::missing_const_for_fn)]
+#![allow(unsupported_calling_conventions)]
+#![feature(const_extern_fn)]
+
+extern "C-unwind" fn c_unwind() {}
+//~^ ERROR: this could be a `const fn`
+extern "system" fn system() {}
+//~^ ERROR: this could be a `const fn`
+extern "system-unwind" fn system_unwind() {}
+//~^ ERROR: this could be a `const fn`
+pub extern "stdcall" fn std_call() {}
+//~^ ERROR: this could be a `const fn`
+pub extern "stdcall-unwind" fn std_call_unwind() {}
+//~^ ERROR: this could be a `const fn`
diff --git a/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.stderr b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.stderr
new file mode 100644
index 0000000000000..036094a367b22
--- /dev/null
+++ b/src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.stderr
@@ -0,0 +1,59 @@
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:5:1
+   |
+LL | extern "C-unwind" fn c_unwind() {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D clippy::missing-const-for-fn` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::missing_const_for_fn)]`
+help: make the function `const`
+   |
+LL | const extern "C-unwind" fn c_unwind() {}
+   | +++++
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:7:1
+   |
+LL | extern "system" fn system() {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL | const extern "system" fn system() {}
+   | +++++
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:9:1
+   |
+LL | extern "system-unwind" fn system_unwind() {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL | const extern "system-unwind" fn system_unwind() {}
+   | +++++
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:11:1
+   |
+LL | pub extern "stdcall" fn std_call() {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL | pub const extern "stdcall" fn std_call() {}
+   |     +++++
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:13:1
+   |
+LL | pub extern "stdcall-unwind" fn std_call_unwind() {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL | pub const extern "stdcall-unwind" fn std_call_unwind() {}
+   |     +++++
+
+error: aborting due to 5 previous errors
+
diff --git a/src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.fixed b/src/tools/clippy/tests/ui/missing_const_for_thread_local.fixed
similarity index 97%
rename from src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.fixed
rename to src/tools/clippy/tests/ui/missing_const_for_thread_local.fixed
index 4c9bd0bd8634f..90b31b9b5d219 100644
--- a/src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.fixed
+++ b/src/tools/clippy/tests/ui/missing_const_for_thread_local.fixed
@@ -1,4 +1,4 @@
-#![warn(clippy::thread_local_initializer_can_be_made_const)]
+#![warn(clippy::missing_const_for_thread_local)]
 
 use std::cell::{Cell, RefCell};
 
diff --git a/src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.rs b/src/tools/clippy/tests/ui/missing_const_for_thread_local.rs
similarity index 97%
rename from src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.rs
rename to src/tools/clippy/tests/ui/missing_const_for_thread_local.rs
index eb336f0dd1913..f97e4848fd7a6 100644
--- a/src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.rs
+++ b/src/tools/clippy/tests/ui/missing_const_for_thread_local.rs
@@ -1,4 +1,4 @@
-#![warn(clippy::thread_local_initializer_can_be_made_const)]
+#![warn(clippy::missing_const_for_thread_local)]
 
 use std::cell::{Cell, RefCell};
 
diff --git a/src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.stderr b/src/tools/clippy/tests/ui/missing_const_for_thread_local.stderr
similarity index 72%
rename from src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.stderr
rename to src/tools/clippy/tests/ui/missing_const_for_thread_local.stderr
index b4f8bd822b0de..c143a37454f5b 100644
--- a/src/tools/clippy/tests/ui/thread_local_initializer_can_be_made_const.stderr
+++ b/src/tools/clippy/tests/ui/missing_const_for_thread_local.stderr
@@ -1,38 +1,38 @@
 error: initializer for `thread_local` value can be made `const`
-  --> tests/ui/thread_local_initializer_can_be_made_const.rs:8:41
+  --> tests/ui/missing_const_for_thread_local.rs:8:41
    |
 LL |         static BUF_1: RefCell<String> = RefCell::new(String::new());
    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `const { RefCell::new(String::new()) }`
    |
-   = note: `-D clippy::thread-local-initializer-can-be-made-const` implied by `-D warnings`
-   = help: to override `-D warnings` add `#[allow(clippy::thread_local_initializer_can_be_made_const)]`
+   = note: `-D clippy::missing-const-for-thread-local` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::missing_const_for_thread_local)]`
 
 error: initializer for `thread_local` value can be made `const`
-  --> tests/ui/thread_local_initializer_can_be_made_const.rs:18:29
+  --> tests/ui/missing_const_for_thread_local.rs:18:29
    |
 LL |         static SIMPLE:i32 = 1;
    |                             ^ help: replace with: `const { 1 }`
 
 error: initializer for `thread_local` value can be made `const`
-  --> tests/ui/thread_local_initializer_can_be_made_const.rs:24:59
+  --> tests/ui/missing_const_for_thread_local.rs:24:59
    |
 LL |         static BUF_3_CAN_BE_MADE_CONST: RefCell<String> = RefCell::new(String::new());
    |                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `const { RefCell::new(String::new()) }`
 
 error: initializer for `thread_local` value can be made `const`
-  --> tests/ui/thread_local_initializer_can_be_made_const.rs:26:59
+  --> tests/ui/missing_const_for_thread_local.rs:26:59
    |
 LL |         static BUF_4_CAN_BE_MADE_CONST: RefCell<String> = RefCell::new(String::new());
    |                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `const { RefCell::new(String::new()) }`
 
 error: initializer for `thread_local` value can be made `const`
-  --> tests/ui/thread_local_initializer_can_be_made_const.rs:32:31
+  --> tests/ui/missing_const_for_thread_local.rs:32:31
    |
 LL |         static PEEL_ME: i32 = { 1 };
    |                               ^^^^^ help: replace with: `const { 1 }`
 
 error: initializer for `thread_local` value can be made `const`
-  --> tests/ui/thread_local_initializer_can_be_made_const.rs:34:36
+  --> tests/ui/missing_const_for_thread_local.rs:34:36
    |
 LL |         static PEEL_ME_MANY: i32 = { let x = 1; x * x };
    |                                    ^^^^^^^^^^^^^^^^^^^^ help: replace with: `const { { let x = 1; x * x } }`
diff --git a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.rs b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.rs
index eee62122fdfda..162ec82aeded2 100644
--- a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.rs
+++ b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.rs
@@ -232,43 +232,48 @@ async fn async_vec2(b: &mut Vec<bool>) {
 }
 fn non_mut(n: &str) {}
 //Should warn
-pub async fn call_in_closure1(n: &mut str) {
+async fn call_in_closure1(n: &mut str) {
     (|| non_mut(n))()
 }
 fn str_mut(str: &mut String) -> bool {
     str.pop().is_some()
 }
 //Should not warn
-pub async fn call_in_closure2(str: &mut String) {
+async fn call_in_closure2(str: &mut String) {
     (|| str_mut(str))();
 }
 
 // Should not warn.
-pub async fn closure(n: &mut usize) -> impl '_ + FnMut() {
+async fn closure(n: &mut usize) -> impl '_ + FnMut() {
     || {
         *n += 1;
     }
 }
 
 // Should warn.
-pub fn closure2(n: &mut usize) -> impl '_ + FnMut() -> usize {
+fn closure2(n: &mut usize) -> impl '_ + FnMut() -> usize {
     //~^ ERROR: this argument is a mutable reference, but not used mutably
     || *n + 1
 }
 
 // Should not warn.
-pub async fn closure3(n: &mut usize) {
+async fn closure3(n: &mut usize) {
     (|| *n += 1)();
 }
 
 // Should warn.
-pub async fn closure4(n: &mut usize) {
+async fn closure4(n: &mut usize) {
     //~^ ERROR: this argument is a mutable reference, but not used mutably
     (|| {
         let _x = *n + 1;
     })();
 }
 
+// Should not warn: pub
+pub fn pub_foo(s: &mut Vec<u32>, b: &u32, x: &mut u32) {
+    *x += *b + s.len() as u32;
+}
+
 // Should not warn.
 async fn _f(v: &mut Vec<()>) {
     let x = || v.pop();
@@ -365,4 +370,5 @@ fn main() {
     used_as_path;
     let _: fn(&mut u32) = passed_as_local;
     let _ = if v[0] == 0 { ty_unify_1 } else { ty_unify_2 };
+    pub_foo(&mut v, &0, &mut u);
 }
diff --git a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.stderr b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.stderr
index 51e3ba37dede1..f462fa9099ed6 100644
--- a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.stderr
+++ b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut.stderr
@@ -108,109 +108,103 @@ LL | async fn inner_async3(x: &mut i32, y: &mut u32) {
    |                          ^^^^^^^^ help: consider changing to: `&i32`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:235:34
+  --> tests/ui/needless_pass_by_ref_mut.rs:235:30
    |
-LL | pub async fn call_in_closure1(n: &mut str) {
-   |                                  ^^^^^^^^ help: consider changing to: `&str`
-   |
-   = warning: changing this function will impact semver compatibility
+LL | async fn call_in_closure1(n: &mut str) {
+   |                              ^^^^^^^^ help: consider changing to: `&str`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:254:20
-   |
-LL | pub fn closure2(n: &mut usize) -> impl '_ + FnMut() -> usize {
-   |                    ^^^^^^^^^^ help: consider changing to: `&usize`
+  --> tests/ui/needless_pass_by_ref_mut.rs:254:16
    |
-   = warning: changing this function will impact semver compatibility
+LL | fn closure2(n: &mut usize) -> impl '_ + FnMut() -> usize {
+   |                ^^^^^^^^^^ help: consider changing to: `&usize`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:265:26
-   |
-LL | pub async fn closure4(n: &mut usize) {
-   |                          ^^^^^^^^^^ help: consider changing to: `&usize`
+  --> tests/ui/needless_pass_by_ref_mut.rs:265:22
    |
-   = warning: changing this function will impact semver compatibility
+LL | async fn closure4(n: &mut usize) {
+   |                      ^^^^^^^^^^ help: consider changing to: `&usize`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:314:12
+  --> tests/ui/needless_pass_by_ref_mut.rs:319:12
    |
 LL |     fn bar(&mut self) {}
    |            ^^^^^^^^^ help: consider changing to: `&self`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:316:18
+  --> tests/ui/needless_pass_by_ref_mut.rs:321:18
    |
 LL |     async fn foo(&mut self, u: &mut i32, v: &mut u32) {
    |                  ^^^^^^^^^ help: consider changing to: `&self`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:316:45
+  --> tests/ui/needless_pass_by_ref_mut.rs:321:45
    |
 LL |     async fn foo(&mut self, u: &mut i32, v: &mut u32) {
    |                                             ^^^^^^^^ help: consider changing to: `&u32`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:324:46
+  --> tests/ui/needless_pass_by_ref_mut.rs:329:46
    |
 LL |     async fn foo2(&mut self, u: &mut i32, v: &mut u32) {
    |                                              ^^^^^^^^ help: consider changing to: `&u32`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:340:18
+  --> tests/ui/needless_pass_by_ref_mut.rs:345:18
    |
 LL | fn _empty_tup(x: &mut (())) {}
    |                  ^^^^^^^^^ help: consider changing to: `&()`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:341:19
+  --> tests/ui/needless_pass_by_ref_mut.rs:346:19
    |
 LL | fn _single_tup(x: &mut ((i32,))) {}
    |                   ^^^^^^^^^^^^^ help: consider changing to: `&(i32,)`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:342:18
+  --> tests/ui/needless_pass_by_ref_mut.rs:347:18
    |
 LL | fn _multi_tup(x: &mut ((i32, u32))) {}
    |                  ^^^^^^^^^^^^^^^^^ help: consider changing to: `&(i32, u32)`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:343:11
+  --> tests/ui/needless_pass_by_ref_mut.rs:348:11
    |
 LL | fn _fn(x: &mut (fn())) {}
    |           ^^^^^^^^^^^ help: consider changing to: `&fn()`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:345:23
+  --> tests/ui/needless_pass_by_ref_mut.rs:350:23
    |
 LL | fn _extern_rust_fn(x: &mut extern "Rust" fn()) {}
    |                       ^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&extern "Rust" fn()`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:346:20
+  --> tests/ui/needless_pass_by_ref_mut.rs:351:20
    |
 LL | fn _extern_c_fn(x: &mut extern "C" fn()) {}
    |                    ^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&extern "C" fn()`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:347:18
+  --> tests/ui/needless_pass_by_ref_mut.rs:352:18
    |
 LL | fn _unsafe_fn(x: &mut unsafe fn()) {}
    |                  ^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe fn()`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:348:25
+  --> tests/ui/needless_pass_by_ref_mut.rs:353:25
    |
 LL | fn _unsafe_extern_fn(x: &mut unsafe extern "C" fn()) {}
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe extern "C" fn()`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:349:20
+  --> tests/ui/needless_pass_by_ref_mut.rs:354:20
    |
 LL | fn _fn_with_arg(x: &mut unsafe extern "C" fn(i32)) {}
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe extern "C" fn(i32)`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut.rs:350:20
+  --> tests/ui/needless_pass_by_ref_mut.rs:355:20
    |
 LL | fn _fn_with_ret(x: &mut unsafe extern "C" fn() -> (i32)) {}
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe extern "C" fn() -> (i32)`
diff --git a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.fixed b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.fixed
index 3c2576213cd77..f26b39ea6a16b 100644
--- a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.fixed
+++ b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.fixed
@@ -5,7 +5,7 @@
 #![allow(clippy::redundant_closure_call)]
 #![warn(clippy::needless_pass_by_ref_mut)]
 
-pub async fn inner_async3(x: &i32, y: &mut u32) {
+async fn inner_async3(x: &i32, y: &mut u32) {
     //~^ ERROR: this argument is a mutable reference, but not used mutably
     async {
         *y += 1;
@@ -13,7 +13,7 @@ pub async fn inner_async3(x: &i32, y: &mut u32) {
     .await;
 }
 
-pub async fn inner_async4(u: &mut i32, v: &u32) {
+async fn inner_async4(u: &mut i32, v: &u32) {
     //~^ ERROR: this argument is a mutable reference, but not used mutably
     async {
         *u += 1;
diff --git a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.rs b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.rs
index 34b0b564deb8e..4220215b1fe9b 100644
--- a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.rs
+++ b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.rs
@@ -5,7 +5,7 @@
 #![allow(clippy::redundant_closure_call)]
 #![warn(clippy::needless_pass_by_ref_mut)]
 
-pub async fn inner_async3(x: &mut i32, y: &mut u32) {
+async fn inner_async3(x: &mut i32, y: &mut u32) {
     //~^ ERROR: this argument is a mutable reference, but not used mutably
     async {
         *y += 1;
@@ -13,7 +13,7 @@ pub async fn inner_async3(x: &mut i32, y: &mut u32) {
     .await;
 }
 
-pub async fn inner_async4(u: &mut i32, v: &mut u32) {
+async fn inner_async4(u: &mut i32, v: &mut u32) {
     //~^ ERROR: this argument is a mutable reference, but not used mutably
     async {
         *u += 1;
diff --git a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.stderr b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.stderr
index c875360322568..1c0136cf5d594 100644
--- a/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.stderr
+++ b/src/tools/clippy/tests/ui/needless_pass_by_ref_mut2.stderr
@@ -1,20 +1,17 @@
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut2.rs:8:30
+  --> tests/ui/needless_pass_by_ref_mut2.rs:8:26
    |
-LL | pub async fn inner_async3(x: &mut i32, y: &mut u32) {
-   |                              ^^^^^^^^ help: consider changing to: `&i32`
+LL | async fn inner_async3(x: &mut i32, y: &mut u32) {
+   |                          ^^^^^^^^ help: consider changing to: `&i32`
    |
-   = warning: changing this function will impact semver compatibility
    = note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::needless_pass_by_ref_mut)]`
 
 error: this argument is a mutable reference, but not used mutably
-  --> tests/ui/needless_pass_by_ref_mut2.rs:16:43
+  --> tests/ui/needless_pass_by_ref_mut2.rs:16:39
    |
-LL | pub async fn inner_async4(u: &mut i32, v: &mut u32) {
-   |                                           ^^^^^^^^ help: consider changing to: `&u32`
-   |
-   = warning: changing this function will impact semver compatibility
+LL | async fn inner_async4(u: &mut i32, v: &mut u32) {
+   |                                       ^^^^^^^^ help: consider changing to: `&u32`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/tools/clippy/tests/ui/needless_return.fixed b/src/tools/clippy/tests/ui/needless_return.fixed
index 853f685f04c76..fc4129e1db84f 100644
--- a/src/tools/clippy/tests/ui/needless_return.fixed
+++ b/src/tools/clippy/tests/ui/needless_return.fixed
@@ -228,12 +228,41 @@ fn needless_return_macro() -> String {
     format!("Hello {}", "world!")
 }
 
-fn issue_9361() -> i32 {
-    let n = 1;
-    #[allow(clippy::arithmetic_side_effects)]
+fn issue_9361(n: i32) -> i32 {
+    #[expect(clippy::arithmetic_side_effects)]
     return n + n;
 }
 
+mod issue_12998 {
+    fn expect_lint() -> i32 {
+        let x = 1;
+
+        #[expect(clippy::needless_return)]
+        return x;
+    }
+
+    fn expect_group() -> i32 {
+        let x = 1;
+
+        #[expect(clippy::style)]
+        return x;
+    }
+
+    fn expect_all() -> i32 {
+        let x = 1;
+
+        #[expect(clippy::all)]
+        return x;
+    }
+
+    fn expect_warnings() -> i32 {
+        let x = 1;
+
+        #[expect(warnings)]
+        return x;
+    }
+}
+
 fn issue8336(x: i32) -> bool {
     if x > 0 {
         println!("something");
diff --git a/src/tools/clippy/tests/ui/needless_return.rs b/src/tools/clippy/tests/ui/needless_return.rs
index e9c1e0e8ae8ed..61c7a02008f08 100644
--- a/src/tools/clippy/tests/ui/needless_return.rs
+++ b/src/tools/clippy/tests/ui/needless_return.rs
@@ -236,12 +236,41 @@ fn needless_return_macro() -> String {
     return format!("Hello {}", "world!");
 }
 
-fn issue_9361() -> i32 {
-    let n = 1;
-    #[allow(clippy::arithmetic_side_effects)]
+fn issue_9361(n: i32) -> i32 {
+    #[expect(clippy::arithmetic_side_effects)]
     return n + n;
 }
 
+mod issue_12998 {
+    fn expect_lint() -> i32 {
+        let x = 1;
+
+        #[expect(clippy::needless_return)]
+        return x;
+    }
+
+    fn expect_group() -> i32 {
+        let x = 1;
+
+        #[expect(clippy::style)]
+        return x;
+    }
+
+    fn expect_all() -> i32 {
+        let x = 1;
+
+        #[expect(clippy::all)]
+        return x;
+    }
+
+    fn expect_warnings() -> i32 {
+        let x = 1;
+
+        #[expect(warnings)]
+        return x;
+    }
+}
+
 fn issue8336(x: i32) -> bool {
     if x > 0 {
         println!("something");
diff --git a/src/tools/clippy/tests/ui/needless_return.stderr b/src/tools/clippy/tests/ui/needless_return.stderr
index 6c891fe7ad3f8..ea9c230eafd22 100644
--- a/src/tools/clippy/tests/ui/needless_return.stderr
+++ b/src/tools/clippy/tests/ui/needless_return.stderr
@@ -483,7 +483,7 @@ LL +     format!("Hello {}", "world!")
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:248:9
+  --> tests/ui/needless_return.rs:277:9
    |
 LL |         return true;
    |         ^^^^^^^^^^^
@@ -497,7 +497,7 @@ LL ~     }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:250:9
+  --> tests/ui/needless_return.rs:279:9
    |
 LL |         return false;
    |         ^^^^^^^^^^^^
@@ -509,7 +509,7 @@ LL ~     }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:257:13
+  --> tests/ui/needless_return.rs:286:13
    |
 LL |             return 10;
    |             ^^^^^^^^^
@@ -524,7 +524,7 @@ LL ~     }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:260:13
+  --> tests/ui/needless_return.rs:289:13
    |
 LL |             return 100;
    |             ^^^^^^^^^^
@@ -537,7 +537,7 @@ LL ~     }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:268:9
+  --> tests/ui/needless_return.rs:297:9
    |
 LL |         return 0;
    |         ^^^^^^^^
@@ -549,7 +549,7 @@ LL ~     }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:275:13
+  --> tests/ui/needless_return.rs:304:13
    |
 LL |             return *(x as *const isize);
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -564,7 +564,7 @@ LL ~     }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:277:13
+  --> tests/ui/needless_return.rs:306:13
    |
 LL |             return !*(x as *const isize);
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -577,7 +577,7 @@ LL ~     }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:284:20
+  --> tests/ui/needless_return.rs:313:20
    |
 LL |           let _ = 42;
    |  ____________________^
@@ -594,7 +594,7 @@ LL +         let _ = 42;
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:291:20
+  --> tests/ui/needless_return.rs:320:20
    |
 LL |         let _ = 42; return;
    |                    ^^^^^^^
@@ -606,7 +606,7 @@ LL +         let _ = 42;
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:303:9
+  --> tests/ui/needless_return.rs:332:9
    |
 LL |         return Ok(format!("ok!"));
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -618,7 +618,7 @@ LL +         Ok(format!("ok!"))
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:305:9
+  --> tests/ui/needless_return.rs:334:9
    |
 LL |         return Err(format!("err!"));
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -630,7 +630,7 @@ LL +         Err(format!("err!"))
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:311:9
+  --> tests/ui/needless_return.rs:340:9
    |
 LL |         return if true { 1 } else { 2 };
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -642,7 +642,7 @@ LL +         if true { 1 } else { 2 }
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:315:9
+  --> tests/ui/needless_return.rs:344:9
    |
 LL |         return if b1 { 0 } else { 1 } | if b2 { 2 } else { 3 } | if b3 { 4 } else { 5 };
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -654,7 +654,7 @@ LL +         (if b1 { 0 } else { 1 } | if b2 { 2 } else { 3 } | if b3 { 4 } else
    |
 
 error: unneeded `return` statement
-  --> tests/ui/needless_return.rs:336:5
+  --> tests/ui/needless_return.rs:365:5
    |
 LL |     return { "a".to_string() } + "b" + { "c" };
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/tools/clippy/tests/ui/or_fun_call.fixed b/src/tools/clippy/tests/ui/or_fun_call.fixed
index 7657ef470c589..c76f7a81843b2 100644
--- a/src/tools/clippy/tests/ui/or_fun_call.fixed
+++ b/src/tools/clippy/tests/ui/or_fun_call.fixed
@@ -98,7 +98,7 @@ fn or_fun_call() {
 
     let opt = Some(1);
     let hello = "Hello";
-    let _ = opt.ok_or(format!("{} world.", hello));
+    let _ = opt.ok_or_else(|| format!("{} world.", hello));
 
     // index
     let map = HashMap::<u64, u64>::new();
diff --git a/src/tools/clippy/tests/ui/or_fun_call.stderr b/src/tools/clippy/tests/ui/or_fun_call.stderr
index b5a30f2992316..3070db22fc5a6 100644
--- a/src/tools/clippy/tests/ui/or_fun_call.stderr
+++ b/src/tools/clippy/tests/ui/or_fun_call.stderr
@@ -100,6 +100,12 @@ error: use of `unwrap_or` to construct default value
 LL |     let _ = stringy.unwrap_or(String::new());
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `unwrap_or_default()`
 
+error: use of `ok_or` followed by a function call
+  --> tests/ui/or_fun_call.rs:101:17
+   |
+LL |     let _ = opt.ok_or(format!("{} world.", hello));
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ok_or_else(|| format!("{} world.", hello))`
+
 error: use of `unwrap_or` followed by a function call
   --> tests/ui/or_fun_call.rs:105:21
    |
@@ -190,5 +196,5 @@ error: use of `unwrap_or_else` to construct default value
 LL |         let _ = stringy.unwrap_or_else(String::new);
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `unwrap_or_default()`
 
-error: aborting due to 31 previous errors
+error: aborting due to 32 previous errors
 
diff --git a/src/tools/clippy/tests/ui/overflow_check_conditional.rs b/src/tools/clippy/tests/ui/overflow_check_conditional.rs
deleted file mode 100644
index a70bb3bc47bfb..0000000000000
--- a/src/tools/clippy/tests/ui/overflow_check_conditional.rs
+++ /dev/null
@@ -1,36 +0,0 @@
-#![warn(clippy::overflow_check_conditional)]
-#![allow(clippy::needless_if)]
-
-fn test(a: u32, b: u32, c: u32) {
-    if a + b < a {}
-    //~^ ERROR: you are trying to use classic C overflow conditions that will fail in Rust
-    //~| NOTE: `-D clippy::overflow-check-conditional` implied by `-D warnings`
-    if a > a + b {}
-    //~^ ERROR: you are trying to use classic C overflow conditions that will fail in Rust
-    if a + b < b {}
-    //~^ ERROR: you are trying to use classic C overflow conditions that will fail in Rust
-    if b > a + b {}
-    //~^ ERROR: you are trying to use classic C overflow conditions that will fail in Rust
-    if a - b > b {}
-    //~^ ERROR: you are trying to use classic C underflow conditions that will fail in Rus
-    if b < a - b {}
-    //~^ ERROR: you are trying to use classic C underflow conditions that will fail in Rus
-    if a - b > a {}
-    //~^ ERROR: you are trying to use classic C underflow conditions that will fail in Rus
-    if a < a - b {}
-    //~^ ERROR: you are trying to use classic C underflow conditions that will fail in Rus
-    if a + b < c {}
-    if c > a + b {}
-    if a - b < c {}
-    if c > a - b {}
-    let i = 1.1;
-    let j = 2.2;
-    if i + j < i {}
-    if i - j < i {}
-    if i > i + j {}
-    if i - j < i {}
-}
-
-fn main() {
-    test(1, 2, 3)
-}
diff --git a/src/tools/clippy/tests/ui/overflow_check_conditional.stderr b/src/tools/clippy/tests/ui/overflow_check_conditional.stderr
deleted file mode 100644
index c14532bad5ab7..0000000000000
--- a/src/tools/clippy/tests/ui/overflow_check_conditional.stderr
+++ /dev/null
@@ -1,53 +0,0 @@
-error: you are trying to use classic C overflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:5:8
-   |
-LL |     if a + b < a {}
-   |        ^^^^^^^^^
-   |
-   = note: `-D clippy::overflow-check-conditional` implied by `-D warnings`
-   = help: to override `-D warnings` add `#[allow(clippy::overflow_check_conditional)]`
-
-error: you are trying to use classic C overflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:8:8
-   |
-LL |     if a > a + b {}
-   |        ^^^^^^^^^
-
-error: you are trying to use classic C overflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:10:8
-   |
-LL |     if a + b < b {}
-   |        ^^^^^^^^^
-
-error: you are trying to use classic C overflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:12:8
-   |
-LL |     if b > a + b {}
-   |        ^^^^^^^^^
-
-error: you are trying to use classic C underflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:14:8
-   |
-LL |     if a - b > b {}
-   |        ^^^^^^^^^
-
-error: you are trying to use classic C underflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:16:8
-   |
-LL |     if b < a - b {}
-   |        ^^^^^^^^^
-
-error: you are trying to use classic C underflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:18:8
-   |
-LL |     if a - b > a {}
-   |        ^^^^^^^^^
-
-error: you are trying to use classic C underflow conditions that will fail in Rust
-  --> tests/ui/overflow_check_conditional.rs:20:8
-   |
-LL |     if a < a - b {}
-   |        ^^^^^^^^^
-
-error: aborting due to 8 previous errors
-
diff --git a/src/tools/clippy/tests/ui/panicking_overflow_checks.rs b/src/tools/clippy/tests/ui/panicking_overflow_checks.rs
new file mode 100644
index 0000000000000..dc2ddeada1e94
--- /dev/null
+++ b/src/tools/clippy/tests/ui/panicking_overflow_checks.rs
@@ -0,0 +1,27 @@
+#![warn(clippy::panicking_overflow_checks)]
+#![allow(clippy::needless_if)]
+
+fn test(a: u32, b: u32, c: u32) {
+    if a + b < a {} //~ panicking_overflow_checks
+    if a > a + b {} //~ panicking_overflow_checks
+    if a + b < b {} //~ panicking_overflow_checks
+    if b > a + b {} //~ panicking_overflow_checks
+    if a - b > b {}
+    if b < a - b {}
+    if a - b > a {} //~ panicking_overflow_checks
+    if a < a - b {} //~ panicking_overflow_checks
+    if a + b < c {}
+    if c > a + b {}
+    if a - b < c {}
+    if c > a - b {}
+    let i = 1.1;
+    let j = 2.2;
+    if i + j < i {}
+    if i - j < i {}
+    if i > i + j {}
+    if i - j < i {}
+}
+
+fn main() {
+    test(1, 2, 3)
+}
diff --git a/src/tools/clippy/tests/ui/panicking_overflow_checks.stderr b/src/tools/clippy/tests/ui/panicking_overflow_checks.stderr
new file mode 100644
index 0000000000000..1fae045788996
--- /dev/null
+++ b/src/tools/clippy/tests/ui/panicking_overflow_checks.stderr
@@ -0,0 +1,41 @@
+error: you are trying to use classic C overflow conditions that will fail in Rust
+  --> tests/ui/panicking_overflow_checks.rs:5:8
+   |
+LL |     if a + b < a {}
+   |        ^^^^^^^^^
+   |
+   = note: `-D clippy::panicking-overflow-checks` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::panicking_overflow_checks)]`
+
+error: you are trying to use classic C overflow conditions that will fail in Rust
+  --> tests/ui/panicking_overflow_checks.rs:6:8
+   |
+LL |     if a > a + b {}
+   |        ^^^^^^^^^
+
+error: you are trying to use classic C overflow conditions that will fail in Rust
+  --> tests/ui/panicking_overflow_checks.rs:7:8
+   |
+LL |     if a + b < b {}
+   |        ^^^^^^^^^
+
+error: you are trying to use classic C overflow conditions that will fail in Rust
+  --> tests/ui/panicking_overflow_checks.rs:8:8
+   |
+LL |     if b > a + b {}
+   |        ^^^^^^^^^
+
+error: you are trying to use classic C overflow conditions that will fail in Rust
+  --> tests/ui/panicking_overflow_checks.rs:11:8
+   |
+LL |     if a - b > a {}
+   |        ^^^^^^^^^
+
+error: you are trying to use classic C overflow conditions that will fail in Rust
+  --> tests/ui/panicking_overflow_checks.rs:12:8
+   |
+LL |     if a < a - b {}
+   |        ^^^^^^^^^
+
+error: aborting due to 6 previous errors
+
diff --git a/src/tools/clippy/tests/ui/ptr_as_ptr.stderr b/src/tools/clippy/tests/ui/ptr_as_ptr.stderr
index e162f35baf551..18462620b0a30 100644
--- a/src/tools/clippy/tests/ui/ptr_as_ptr.stderr
+++ b/src/tools/clippy/tests/ui/ptr_as_ptr.stderr
@@ -1,4 +1,4 @@
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:18:33
    |
 LL |         *unsafe { Box::from_raw(Box::into_raw(Box::new(o)) as *mut super::issue_11278_a::T<String>) }
@@ -7,37 +7,37 @@ LL |         *unsafe { Box::from_raw(Box::into_raw(Box::new(o)) as *mut super::i
    = note: `-D clippy::ptr-as-ptr` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::ptr_as_ptr)]`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:27:13
    |
 LL |     let _ = ptr as *const i32;
    |             ^^^^^^^^^^^^^^^^^ help: try `pointer::cast`, a safer alternative: `ptr.cast::<i32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:28:13
    |
 LL |     let _ = mut_ptr as *mut i32;
    |             ^^^^^^^^^^^^^^^^^^^ help: try `pointer::cast`, a safer alternative: `mut_ptr.cast::<i32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:33:17
    |
 LL |         let _ = *ptr_ptr as *const i32;
    |                 ^^^^^^^^^^^^^^^^^^^^^^ help: try `pointer::cast`, a safer alternative: `(*ptr_ptr).cast::<i32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:46:25
    |
 LL |     let _: *const i32 = ptr as *const _;
    |                         ^^^^^^^^^^^^^^^ help: try `pointer::cast`, a safer alternative: `ptr.cast()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:47:23
    |
 LL |     let _: *mut i32 = mut_ptr as _;
    |                       ^^^^^^^^^^^^ help: try `pointer::cast`, a safer alternative: `mut_ptr.cast()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:50:21
    |
 LL |     let _ = inline!($ptr as *const i32);
@@ -45,157 +45,157 @@ LL |     let _ = inline!($ptr as *const i32);
    |
    = note: this error originates in the macro `__inline_mac_fn_main` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:71:13
    |
 LL |     let _ = ptr as *const i32;
    |             ^^^^^^^^^^^^^^^^^ help: try `pointer::cast`, a safer alternative: `ptr.cast::<i32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:72:13
    |
 LL |     let _ = mut_ptr as *mut i32;
    |             ^^^^^^^^^^^^^^^^^^^ help: try `pointer::cast`, a safer alternative: `mut_ptr.cast::<i32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:79:9
    |
 LL |         ptr::null_mut() as *mut u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null_mut::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:83:9
    |
 LL |         std::ptr::null_mut() as *mut u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `std::ptr::null_mut::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:88:9
    |
 LL |         ptr::null_mut() as *mut u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null_mut::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:92:9
    |
 LL |         core::ptr::null_mut() as *mut u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `core::ptr::null_mut::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:97:9
    |
 LL |         ptr::null() as *const u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:101:9
    |
 LL |         std::ptr::null() as *const u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `std::ptr::null::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:106:9
    |
 LL |         ptr::null() as *const u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:110:9
    |
 LL |         core::ptr::null() as *const u32
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `core::ptr::null::<u32>()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:117:9
    |
 LL |         ptr::null_mut() as *mut _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:121:9
    |
 LL |         std::ptr::null_mut() as *mut _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `std::ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:126:9
    |
 LL |         ptr::null_mut() as *mut _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:130:9
    |
 LL |         core::ptr::null_mut() as *mut _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `core::ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:135:9
    |
 LL |         ptr::null() as *const _
    |         ^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:139:9
    |
 LL |         std::ptr::null() as *const _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `std::ptr::null()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:144:9
    |
 LL |         ptr::null() as *const _
    |         ^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:148:9
    |
 LL |         core::ptr::null() as *const _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `core::ptr::null()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:155:9
    |
 LL |         ptr::null_mut() as _
    |         ^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:159:9
    |
 LL |         std::ptr::null_mut() as _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `std::ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:164:9
    |
 LL |         ptr::null_mut() as _
    |         ^^^^^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:168:9
    |
 LL |         core::ptr::null_mut() as _
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `core::ptr::null_mut()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:173:9
    |
 LL |         ptr::null() as _
    |         ^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:177:9
    |
 LL |         std::ptr::null() as _
    |         ^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `std::ptr::null()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:182:9
    |
 LL |         ptr::null() as _
    |         ^^^^^^^^^^^^^^^^ help: try call directly: `ptr::null()`
 
-error: `as` casting between raw pointers without changing its mutability
+error: `as` casting between raw pointers without changing their constness
   --> tests/ui/ptr_as_ptr.rs:186:9
    |
 LL |         core::ptr::null() as _
diff --git a/src/tools/clippy/tests/ui/rename.fixed b/src/tools/clippy/tests/ui/rename.fixed
index 24d0f79754289..d70c9f8d06c07 100644
--- a/src/tools/clippy/tests/ui/rename.fixed
+++ b/src/tools/clippy/tests/ui/rename.fixed
@@ -24,9 +24,11 @@
 #![allow(clippy::expect_used)]
 #![allow(clippy::map_unwrap_or)]
 #![allow(clippy::unwrap_used)]
+#![allow(clippy::panicking_overflow_checks)]
 #![allow(clippy::needless_borrow)]
 #![allow(clippy::single_char_add_str)]
 #![allow(clippy::module_name_repetitions)]
+#![allow(clippy::missing_const_for_thread_local)]
 #![allow(clippy::recursive_format_impl)]
 #![allow(clippy::unwrap_or_default)]
 #![allow(clippy::invisible_characters)]
@@ -77,12 +79,14 @@
 #![warn(clippy::map_unwrap_or)]
 #![warn(clippy::map_unwrap_or)]
 #![warn(clippy::unwrap_used)]
+#![warn(clippy::panicking_overflow_checks)]
 #![warn(clippy::needless_borrow)]
 #![warn(clippy::expect_used)]
 #![warn(clippy::map_unwrap_or)]
 #![warn(clippy::unwrap_used)]
 #![warn(clippy::single_char_add_str)]
 #![warn(clippy::module_name_repetitions)]
+#![warn(clippy::missing_const_for_thread_local)]
 #![warn(clippy::recursive_format_impl)]
 #![warn(clippy::unwrap_or_default)]
 #![warn(clippy::invisible_characters)]
diff --git a/src/tools/clippy/tests/ui/rename.rs b/src/tools/clippy/tests/ui/rename.rs
index be8da2fa1a38e..8d0ac3c8f9555 100644
--- a/src/tools/clippy/tests/ui/rename.rs
+++ b/src/tools/clippy/tests/ui/rename.rs
@@ -24,9 +24,11 @@
 #![allow(clippy::expect_used)]
 #![allow(clippy::map_unwrap_or)]
 #![allow(clippy::unwrap_used)]
+#![allow(clippy::panicking_overflow_checks)]
 #![allow(clippy::needless_borrow)]
 #![allow(clippy::single_char_add_str)]
 #![allow(clippy::module_name_repetitions)]
+#![allow(clippy::missing_const_for_thread_local)]
 #![allow(clippy::recursive_format_impl)]
 #![allow(clippy::unwrap_or_default)]
 #![allow(clippy::invisible_characters)]
@@ -77,12 +79,14 @@
 #![warn(clippy::option_map_unwrap_or)]
 #![warn(clippy::option_map_unwrap_or_else)]
 #![warn(clippy::option_unwrap_used)]
+#![warn(clippy::overflow_check_conditional)]
 #![warn(clippy::ref_in_deref)]
 #![warn(clippy::result_expect_used)]
 #![warn(clippy::result_map_unwrap_or_else)]
 #![warn(clippy::result_unwrap_used)]
 #![warn(clippy::single_char_push_str)]
 #![warn(clippy::stutter)]
+#![warn(clippy::thread_local_initializer_can_be_made_const)]
 #![warn(clippy::to_string_in_display)]
 #![warn(clippy::unwrap_or_else_default)]
 #![warn(clippy::zero_width_space)]
diff --git a/src/tools/clippy/tests/ui/rename.stderr b/src/tools/clippy/tests/ui/rename.stderr
index 777ac20153da3..d6637324a030b 100644
--- a/src/tools/clippy/tests/ui/rename.stderr
+++ b/src/tools/clippy/tests/ui/rename.stderr
@@ -1,5 +1,5 @@
 error: lint `clippy::almost_complete_letter_range` has been renamed to `clippy::almost_complete_range`
-  --> tests/ui/rename.rs:56:9
+  --> tests/ui/rename.rs:58:9
    |
 LL | #![warn(clippy::almost_complete_letter_range)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::almost_complete_range`
@@ -8,346 +8,358 @@ LL | #![warn(clippy::almost_complete_letter_range)]
    = help: to override `-D warnings` add `#[allow(renamed_and_removed_lints)]`
 
 error: lint `clippy::blacklisted_name` has been renamed to `clippy::disallowed_names`
-  --> tests/ui/rename.rs:57:9
+  --> tests/ui/rename.rs:59:9
    |
 LL | #![warn(clippy::blacklisted_name)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_names`
 
 error: lint `clippy::block_in_if_condition_expr` has been renamed to `clippy::blocks_in_conditions`
-  --> tests/ui/rename.rs:58:9
+  --> tests/ui/rename.rs:60:9
    |
 LL | #![warn(clippy::block_in_if_condition_expr)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_conditions`
 
 error: lint `clippy::block_in_if_condition_stmt` has been renamed to `clippy::blocks_in_conditions`
-  --> tests/ui/rename.rs:59:9
+  --> tests/ui/rename.rs:61:9
    |
 LL | #![warn(clippy::block_in_if_condition_stmt)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_conditions`
 
 error: lint `clippy::blocks_in_if_conditions` has been renamed to `clippy::blocks_in_conditions`
-  --> tests/ui/rename.rs:60:9
+  --> tests/ui/rename.rs:62:9
    |
 LL | #![warn(clippy::blocks_in_if_conditions)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_conditions`
 
 error: lint `clippy::box_vec` has been renamed to `clippy::box_collection`
-  --> tests/ui/rename.rs:61:9
+  --> tests/ui/rename.rs:63:9
    |
 LL | #![warn(clippy::box_vec)]
    |         ^^^^^^^^^^^^^^^ help: use the new name: `clippy::box_collection`
 
 error: lint `clippy::const_static_lifetime` has been renamed to `clippy::redundant_static_lifetimes`
-  --> tests/ui/rename.rs:62:9
+  --> tests/ui/rename.rs:64:9
    |
 LL | #![warn(clippy::const_static_lifetime)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::redundant_static_lifetimes`
 
 error: lint `clippy::cyclomatic_complexity` has been renamed to `clippy::cognitive_complexity`
-  --> tests/ui/rename.rs:63:9
+  --> tests/ui/rename.rs:65:9
    |
 LL | #![warn(clippy::cyclomatic_complexity)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::cognitive_complexity`
 
 error: lint `clippy::derive_hash_xor_eq` has been renamed to `clippy::derived_hash_with_manual_eq`
-  --> tests/ui/rename.rs:64:9
+  --> tests/ui/rename.rs:66:9
    |
 LL | #![warn(clippy::derive_hash_xor_eq)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::derived_hash_with_manual_eq`
 
 error: lint `clippy::disallowed_method` has been renamed to `clippy::disallowed_methods`
-  --> tests/ui/rename.rs:65:9
+  --> tests/ui/rename.rs:67:9
    |
 LL | #![warn(clippy::disallowed_method)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_methods`
 
 error: lint `clippy::disallowed_type` has been renamed to `clippy::disallowed_types`
-  --> tests/ui/rename.rs:66:9
+  --> tests/ui/rename.rs:68:9
    |
 LL | #![warn(clippy::disallowed_type)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_types`
 
 error: lint `clippy::eval_order_dependence` has been renamed to `clippy::mixed_read_write_in_expression`
-  --> tests/ui/rename.rs:67:9
+  --> tests/ui/rename.rs:69:9
    |
 LL | #![warn(clippy::eval_order_dependence)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::mixed_read_write_in_expression`
 
 error: lint `clippy::identity_conversion` has been renamed to `clippy::useless_conversion`
-  --> tests/ui/rename.rs:68:9
+  --> tests/ui/rename.rs:70:9
    |
 LL | #![warn(clippy::identity_conversion)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::useless_conversion`
 
 error: lint `clippy::if_let_some_result` has been renamed to `clippy::match_result_ok`
-  --> tests/ui/rename.rs:69:9
+  --> tests/ui/rename.rs:71:9
    |
 LL | #![warn(clippy::if_let_some_result)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::match_result_ok`
 
 error: lint `clippy::incorrect_clone_impl_on_copy_type` has been renamed to `clippy::non_canonical_clone_impl`
-  --> tests/ui/rename.rs:70:9
+  --> tests/ui/rename.rs:72:9
    |
 LL | #![warn(clippy::incorrect_clone_impl_on_copy_type)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::non_canonical_clone_impl`
 
 error: lint `clippy::incorrect_partial_ord_impl_on_ord_type` has been renamed to `clippy::non_canonical_partial_ord_impl`
-  --> tests/ui/rename.rs:71:9
+  --> tests/ui/rename.rs:73:9
    |
 LL | #![warn(clippy::incorrect_partial_ord_impl_on_ord_type)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::non_canonical_partial_ord_impl`
 
 error: lint `clippy::integer_arithmetic` has been renamed to `clippy::arithmetic_side_effects`
-  --> tests/ui/rename.rs:72:9
+  --> tests/ui/rename.rs:74:9
    |
 LL | #![warn(clippy::integer_arithmetic)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::arithmetic_side_effects`
 
 error: lint `clippy::logic_bug` has been renamed to `clippy::overly_complex_bool_expr`
-  --> tests/ui/rename.rs:73:9
+  --> tests/ui/rename.rs:75:9
    |
 LL | #![warn(clippy::logic_bug)]
    |         ^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::overly_complex_bool_expr`
 
 error: lint `clippy::new_without_default_derive` has been renamed to `clippy::new_without_default`
-  --> tests/ui/rename.rs:74:9
+  --> tests/ui/rename.rs:76:9
    |
 LL | #![warn(clippy::new_without_default_derive)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::new_without_default`
 
 error: lint `clippy::option_and_then_some` has been renamed to `clippy::bind_instead_of_map`
-  --> tests/ui/rename.rs:75:9
+  --> tests/ui/rename.rs:77:9
    |
 LL | #![warn(clippy::option_and_then_some)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::bind_instead_of_map`
 
 error: lint `clippy::option_expect_used` has been renamed to `clippy::expect_used`
-  --> tests/ui/rename.rs:76:9
+  --> tests/ui/rename.rs:78:9
    |
 LL | #![warn(clippy::option_expect_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
 
 error: lint `clippy::option_map_unwrap_or` has been renamed to `clippy::map_unwrap_or`
-  --> tests/ui/rename.rs:77:9
+  --> tests/ui/rename.rs:79:9
    |
 LL | #![warn(clippy::option_map_unwrap_or)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
 
 error: lint `clippy::option_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
-  --> tests/ui/rename.rs:78:9
+  --> tests/ui/rename.rs:80:9
    |
 LL | #![warn(clippy::option_map_unwrap_or_else)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
 
 error: lint `clippy::option_unwrap_used` has been renamed to `clippy::unwrap_used`
-  --> tests/ui/rename.rs:79:9
+  --> tests/ui/rename.rs:81:9
    |
 LL | #![warn(clippy::option_unwrap_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
 
+error: lint `clippy::overflow_check_conditional` has been renamed to `clippy::panicking_overflow_checks`
+  --> tests/ui/rename.rs:82:9
+   |
+LL | #![warn(clippy::overflow_check_conditional)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::panicking_overflow_checks`
+
 error: lint `clippy::ref_in_deref` has been renamed to `clippy::needless_borrow`
-  --> tests/ui/rename.rs:80:9
+  --> tests/ui/rename.rs:83:9
    |
 LL | #![warn(clippy::ref_in_deref)]
    |         ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::needless_borrow`
 
 error: lint `clippy::result_expect_used` has been renamed to `clippy::expect_used`
-  --> tests/ui/rename.rs:81:9
+  --> tests/ui/rename.rs:84:9
    |
 LL | #![warn(clippy::result_expect_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
 
 error: lint `clippy::result_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
-  --> tests/ui/rename.rs:82:9
+  --> tests/ui/rename.rs:85:9
    |
 LL | #![warn(clippy::result_map_unwrap_or_else)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
 
 error: lint `clippy::result_unwrap_used` has been renamed to `clippy::unwrap_used`
-  --> tests/ui/rename.rs:83:9
+  --> tests/ui/rename.rs:86:9
    |
 LL | #![warn(clippy::result_unwrap_used)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
 
 error: lint `clippy::single_char_push_str` has been renamed to `clippy::single_char_add_str`
-  --> tests/ui/rename.rs:84:9
+  --> tests/ui/rename.rs:87:9
    |
 LL | #![warn(clippy::single_char_push_str)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::single_char_add_str`
 
 error: lint `clippy::stutter` has been renamed to `clippy::module_name_repetitions`
-  --> tests/ui/rename.rs:85:9
+  --> tests/ui/rename.rs:88:9
    |
 LL | #![warn(clippy::stutter)]
    |         ^^^^^^^^^^^^^^^ help: use the new name: `clippy::module_name_repetitions`
 
+error: lint `clippy::thread_local_initializer_can_be_made_const` has been renamed to `clippy::missing_const_for_thread_local`
+  --> tests/ui/rename.rs:89:9
+   |
+LL | #![warn(clippy::thread_local_initializer_can_be_made_const)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::missing_const_for_thread_local`
+
 error: lint `clippy::to_string_in_display` has been renamed to `clippy::recursive_format_impl`
-  --> tests/ui/rename.rs:86:9
+  --> tests/ui/rename.rs:90:9
    |
 LL | #![warn(clippy::to_string_in_display)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::recursive_format_impl`
 
 error: lint `clippy::unwrap_or_else_default` has been renamed to `clippy::unwrap_or_default`
-  --> tests/ui/rename.rs:87:9
+  --> tests/ui/rename.rs:91:9
    |
 LL | #![warn(clippy::unwrap_or_else_default)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_or_default`
 
 error: lint `clippy::zero_width_space` has been renamed to `clippy::invisible_characters`
-  --> tests/ui/rename.rs:88:9
+  --> tests/ui/rename.rs:92:9
    |
 LL | #![warn(clippy::zero_width_space)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::invisible_characters`
 
 error: lint `clippy::cast_ref_to_mut` has been renamed to `invalid_reference_casting`
-  --> tests/ui/rename.rs:89:9
+  --> tests/ui/rename.rs:93:9
    |
 LL | #![warn(clippy::cast_ref_to_mut)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_reference_casting`
 
 error: lint `clippy::clone_double_ref` has been renamed to `suspicious_double_ref_op`
-  --> tests/ui/rename.rs:90:9
+  --> tests/ui/rename.rs:94:9
    |
 LL | #![warn(clippy::clone_double_ref)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `suspicious_double_ref_op`
 
 error: lint `clippy::cmp_nan` has been renamed to `invalid_nan_comparisons`
-  --> tests/ui/rename.rs:91:9
+  --> tests/ui/rename.rs:95:9
    |
 LL | #![warn(clippy::cmp_nan)]
    |         ^^^^^^^^^^^^^^^ help: use the new name: `invalid_nan_comparisons`
 
 error: lint `clippy::drop_bounds` has been renamed to `drop_bounds`
-  --> tests/ui/rename.rs:92:9
+  --> tests/ui/rename.rs:96:9
    |
 LL | #![warn(clippy::drop_bounds)]
    |         ^^^^^^^^^^^^^^^^^^^ help: use the new name: `drop_bounds`
 
 error: lint `clippy::drop_copy` has been renamed to `dropping_copy_types`
-  --> tests/ui/rename.rs:93:9
+  --> tests/ui/rename.rs:97:9
    |
 LL | #![warn(clippy::drop_copy)]
    |         ^^^^^^^^^^^^^^^^^ help: use the new name: `dropping_copy_types`
 
 error: lint `clippy::drop_ref` has been renamed to `dropping_references`
-  --> tests/ui/rename.rs:94:9
+  --> tests/ui/rename.rs:98:9
    |
 LL | #![warn(clippy::drop_ref)]
    |         ^^^^^^^^^^^^^^^^ help: use the new name: `dropping_references`
 
 error: lint `clippy::fn_null_check` has been renamed to `useless_ptr_null_checks`
-  --> tests/ui/rename.rs:95:9
+  --> tests/ui/rename.rs:99:9
    |
 LL | #![warn(clippy::fn_null_check)]
    |         ^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `useless_ptr_null_checks`
 
 error: lint `clippy::for_loop_over_option` has been renamed to `for_loops_over_fallibles`
-  --> tests/ui/rename.rs:96:9
+  --> tests/ui/rename.rs:100:9
    |
 LL | #![warn(clippy::for_loop_over_option)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
 
 error: lint `clippy::for_loop_over_result` has been renamed to `for_loops_over_fallibles`
-  --> tests/ui/rename.rs:97:9
+  --> tests/ui/rename.rs:101:9
    |
 LL | #![warn(clippy::for_loop_over_result)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
 
 error: lint `clippy::for_loops_over_fallibles` has been renamed to `for_loops_over_fallibles`
-  --> tests/ui/rename.rs:98:9
+  --> tests/ui/rename.rs:102:9
    |
 LL | #![warn(clippy::for_loops_over_fallibles)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
 
 error: lint `clippy::forget_copy` has been renamed to `forgetting_copy_types`
-  --> tests/ui/rename.rs:99:9
+  --> tests/ui/rename.rs:103:9
    |
 LL | #![warn(clippy::forget_copy)]
    |         ^^^^^^^^^^^^^^^^^^^ help: use the new name: `forgetting_copy_types`
 
 error: lint `clippy::forget_ref` has been renamed to `forgetting_references`
-  --> tests/ui/rename.rs:100:9
+  --> tests/ui/rename.rs:104:9
    |
 LL | #![warn(clippy::forget_ref)]
    |         ^^^^^^^^^^^^^^^^^^ help: use the new name: `forgetting_references`
 
 error: lint `clippy::into_iter_on_array` has been renamed to `array_into_iter`
-  --> tests/ui/rename.rs:101:9
+  --> tests/ui/rename.rs:105:9
    |
 LL | #![warn(clippy::into_iter_on_array)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `array_into_iter`
 
 error: lint `clippy::invalid_atomic_ordering` has been renamed to `invalid_atomic_ordering`
-  --> tests/ui/rename.rs:102:9
+  --> tests/ui/rename.rs:106:9
    |
 LL | #![warn(clippy::invalid_atomic_ordering)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_atomic_ordering`
 
 error: lint `clippy::invalid_ref` has been renamed to `invalid_value`
-  --> tests/ui/rename.rs:103:9
+  --> tests/ui/rename.rs:107:9
    |
 LL | #![warn(clippy::invalid_ref)]
    |         ^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_value`
 
 error: lint `clippy::invalid_utf8_in_unchecked` has been renamed to `invalid_from_utf8_unchecked`
-  --> tests/ui/rename.rs:104:9
+  --> tests/ui/rename.rs:108:9
    |
 LL | #![warn(clippy::invalid_utf8_in_unchecked)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_from_utf8_unchecked`
 
 error: lint `clippy::let_underscore_drop` has been renamed to `let_underscore_drop`
-  --> tests/ui/rename.rs:105:9
+  --> tests/ui/rename.rs:109:9
    |
 LL | #![warn(clippy::let_underscore_drop)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `let_underscore_drop`
 
 error: lint `clippy::mem_discriminant_non_enum` has been renamed to `enum_intrinsics_non_enums`
-  --> tests/ui/rename.rs:106:9
+  --> tests/ui/rename.rs:110:9
    |
 LL | #![warn(clippy::mem_discriminant_non_enum)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `enum_intrinsics_non_enums`
 
 error: lint `clippy::panic_params` has been renamed to `non_fmt_panics`
-  --> tests/ui/rename.rs:107:9
+  --> tests/ui/rename.rs:111:9
    |
 LL | #![warn(clippy::panic_params)]
    |         ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panics`
 
 error: lint `clippy::positional_named_format_parameters` has been renamed to `named_arguments_used_positionally`
-  --> tests/ui/rename.rs:108:9
+  --> tests/ui/rename.rs:112:9
    |
 LL | #![warn(clippy::positional_named_format_parameters)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `named_arguments_used_positionally`
 
 error: lint `clippy::temporary_cstring_as_ptr` has been renamed to `temporary_cstring_as_ptr`
-  --> tests/ui/rename.rs:109:9
+  --> tests/ui/rename.rs:113:9
    |
 LL | #![warn(clippy::temporary_cstring_as_ptr)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `temporary_cstring_as_ptr`
 
 error: lint `clippy::undropped_manually_drops` has been renamed to `undropped_manually_drops`
-  --> tests/ui/rename.rs:110:9
+  --> tests/ui/rename.rs:114:9
    |
 LL | #![warn(clippy::undropped_manually_drops)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `undropped_manually_drops`
 
 error: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
-  --> tests/ui/rename.rs:111:9
+  --> tests/ui/rename.rs:115:9
    |
 LL | #![warn(clippy::unknown_clippy_lints)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unknown_lints`
 
 error: lint `clippy::unused_label` has been renamed to `unused_labels`
-  --> tests/ui/rename.rs:112:9
+  --> tests/ui/rename.rs:116:9
    |
 LL | #![warn(clippy::unused_label)]
    |         ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_labels`
 
 error: lint `clippy::vtable_address_comparisons` has been renamed to `ambiguous_wide_pointer_comparisons`
-  --> tests/ui/rename.rs:113:9
+  --> tests/ui/rename.rs:117:9
    |
 LL | #![warn(clippy::vtable_address_comparisons)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `ambiguous_wide_pointer_comparisons`
 
-error: aborting due to 58 previous errors
+error: aborting due to 60 previous errors
 
diff --git a/src/tools/clippy/tests/ui/set_contains_or_insert.rs b/src/tools/clippy/tests/ui/set_contains_or_insert.rs
new file mode 100644
index 0000000000000..8465007402ab0
--- /dev/null
+++ b/src/tools/clippy/tests/ui/set_contains_or_insert.rs
@@ -0,0 +1,83 @@
+#![allow(unused)]
+#![allow(clippy::nonminimal_bool)]
+#![allow(clippy::needless_borrow)]
+#![warn(clippy::set_contains_or_insert)]
+
+use std::collections::HashSet;
+
+fn main() {
+    should_warn_cases();
+
+    should_not_warn_cases();
+}
+
+fn should_warn_cases() {
+    let mut set = HashSet::new();
+    let value = 5;
+
+    if !set.contains(&value) {
+        set.insert(value);
+        println!("Just a comment");
+    }
+
+    if set.contains(&value) {
+        set.insert(value);
+        println!("Just a comment");
+    }
+
+    if !set.contains(&value) {
+        set.insert(value);
+    }
+
+    if !!set.contains(&value) {
+        set.insert(value);
+        println!("Just a comment");
+    }
+
+    if (&set).contains(&value) {
+        set.insert(value);
+    }
+
+    let borrow_value = &6;
+    if !set.contains(borrow_value) {
+        set.insert(*borrow_value);
+    }
+
+    let borrow_set = &mut set;
+    if !borrow_set.contains(&value) {
+        borrow_set.insert(value);
+    }
+}
+
+fn should_not_warn_cases() {
+    let mut set = HashSet::new();
+    let value = 5;
+    let another_value = 6;
+
+    if !set.contains(&value) {
+        set.insert(another_value);
+    }
+
+    if !set.contains(&value) {
+        println!("Just a comment");
+    }
+
+    if simply_true() {
+        set.insert(value);
+    }
+
+    if !set.contains(&value) {
+        set.replace(value); //it is not insert
+        println!("Just a comment");
+    }
+
+    if set.contains(&value) {
+        println!("value is already in set");
+    } else {
+        set.insert(value);
+    }
+}
+
+fn simply_true() -> bool {
+    true
+}
diff --git a/src/tools/clippy/tests/ui/set_contains_or_insert.stderr b/src/tools/clippy/tests/ui/set_contains_or_insert.stderr
new file mode 100644
index 0000000000000..507e20964fc20
--- /dev/null
+++ b/src/tools/clippy/tests/ui/set_contains_or_insert.stderr
@@ -0,0 +1,61 @@
+error: usage of `HashSet::insert` after `HashSet::contains`
+  --> tests/ui/set_contains_or_insert.rs:18:13
+   |
+LL |     if !set.contains(&value) {
+   |             ^^^^^^^^^^^^^^^^
+LL |         set.insert(value);
+   |             ^^^^^^^^^^^^^
+   |
+   = note: `-D clippy::set-contains-or-insert` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::set_contains_or_insert)]`
+
+error: usage of `HashSet::insert` after `HashSet::contains`
+  --> tests/ui/set_contains_or_insert.rs:23:12
+   |
+LL |     if set.contains(&value) {
+   |            ^^^^^^^^^^^^^^^^
+LL |         set.insert(value);
+   |             ^^^^^^^^^^^^^
+
+error: usage of `HashSet::insert` after `HashSet::contains`
+  --> tests/ui/set_contains_or_insert.rs:28:13
+   |
+LL |     if !set.contains(&value) {
+   |             ^^^^^^^^^^^^^^^^
+LL |         set.insert(value);
+   |             ^^^^^^^^^^^^^
+
+error: usage of `HashSet::insert` after `HashSet::contains`
+  --> tests/ui/set_contains_or_insert.rs:32:14
+   |
+LL |     if !!set.contains(&value) {
+   |              ^^^^^^^^^^^^^^^^
+LL |         set.insert(value);
+   |             ^^^^^^^^^^^^^
+
+error: usage of `HashSet::insert` after `HashSet::contains`
+  --> tests/ui/set_contains_or_insert.rs:37:15
+   |
+LL |     if (&set).contains(&value) {
+   |               ^^^^^^^^^^^^^^^^
+LL |         set.insert(value);
+   |             ^^^^^^^^^^^^^
+
+error: usage of `HashSet::insert` after `HashSet::contains`
+  --> tests/ui/set_contains_or_insert.rs:42:13
+   |
+LL |     if !set.contains(borrow_value) {
+   |             ^^^^^^^^^^^^^^^^^^^^^^
+LL |         set.insert(*borrow_value);
+   |             ^^^^^^^^^^^^^^^^^^^^^
+
+error: usage of `HashSet::insert` after `HashSet::contains`
+  --> tests/ui/set_contains_or_insert.rs:47:20
+   |
+LL |     if !borrow_set.contains(&value) {
+   |                    ^^^^^^^^^^^^^^^^
+LL |         borrow_set.insert(value);
+   |                    ^^^^^^^^^^^^^
+
+error: aborting due to 7 previous errors
+
diff --git a/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.rs b/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.rs
index 8ee15440ccf01..0db6fbfb7be9b 100644
--- a/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.rs
+++ b/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.rs
@@ -801,4 +801,30 @@ fn should_not_trigger_lint_with_explicit_drop() {
     }
 }
 
+fn should_trigger_lint_in_if_let() {
+    let mutex = Mutex::new(vec![1]);
+
+    if let Some(val) = mutex.lock().unwrap().first().copied() {
+        //~^ ERROR: temporary with significant `Drop` in `if let` scrutinee will live until the
+        //~| NOTE: this might lead to deadlocks or other unexpected behavior
+        println!("{}", val);
+    }
+
+    // Should not trigger lint without the final `copied()`, because we actually hold a reference
+    // (i.e., the `val`) to the locked data.
+    if let Some(val) = mutex.lock().unwrap().first() {
+        println!("{}", val);
+    };
+}
+
+fn should_trigger_lint_in_while_let() {
+    let mutex = Mutex::new(vec![1]);
+
+    while let Some(val) = mutex.lock().unwrap().pop() {
+        //~^ ERROR: temporary with significant `Drop` in `while let` scrutinee will live until the
+        //~| NOTE: this might lead to deadlocks or other unexpected behavior
+        println!("{}", val);
+    }
+}
+
 fn main() {}
diff --git a/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.stderr b/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.stderr
index 4a483e79d8add..c0c93cd10c027 100644
--- a/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.stderr
+++ b/src/tools/clippy/tests/ui/significant_drop_in_scrutinee.stderr
@@ -541,5 +541,32 @@ LL ~     let value = mutex.lock().unwrap()[0];
 LL ~     for val in [value, 2] {
    |
 
-error: aborting due to 27 previous errors
+error: temporary with significant `Drop` in `if let` scrutinee will live until the end of the `if let` expression
+  --> tests/ui/significant_drop_in_scrutinee.rs:807:24
+   |
+LL |     if let Some(val) = mutex.lock().unwrap().first().copied() {
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL |     }
+   |      - temporary lives until here
+   |
+   = note: this might lead to deadlocks or other unexpected behavior
+help: try moving the temporary above the match
+   |
+LL ~     let value = mutex.lock().unwrap().first().copied();
+LL ~     if let Some(val) = value {
+   |
+
+error: temporary with significant `Drop` in `while let` scrutinee will live until the end of the `while let` expression
+  --> tests/ui/significant_drop_in_scrutinee.rs:823:27
+   |
+LL |     while let Some(val) = mutex.lock().unwrap().pop() {
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL |     }
+   |      - temporary lives until here
+   |
+   = note: this might lead to deadlocks or other unexpected behavior
+
+error: aborting due to 29 previous errors
 
diff --git a/src/tools/clippy/tests/ui/unnecessary_operation.fixed b/src/tools/clippy/tests/ui/unnecessary_operation.fixed
index 11761c6c90e36..006f123cbcdfc 100644
--- a/src/tools/clippy/tests/ui/unnecessary_operation.fixed
+++ b/src/tools/clippy/tests/ui/unnecessary_operation.fixed
@@ -43,7 +43,7 @@ fn get_number() -> i32 {
     0
 }
 
-fn get_usize() -> usize {
+const fn get_usize() -> usize {
     0
 }
 fn get_struct() -> Struct {
@@ -113,4 +113,16 @@ fn main() {
     'label: {
         break 'label
     };
+    let () = const {
+        [42, 55][get_usize()];
+    };
+}
+
+const _: () = {
+    [42, 55][get_usize()];
+};
+
+const fn foo() {
+    assert!([42, 55].len() > get_usize());
+    //~^ ERROR: unnecessary operation
 }
diff --git a/src/tools/clippy/tests/ui/unnecessary_operation.rs b/src/tools/clippy/tests/ui/unnecessary_operation.rs
index de0081289ac3d..b4067c7407415 100644
--- a/src/tools/clippy/tests/ui/unnecessary_operation.rs
+++ b/src/tools/clippy/tests/ui/unnecessary_operation.rs
@@ -43,7 +43,7 @@ fn get_number() -> i32 {
     0
 }
 
-fn get_usize() -> usize {
+const fn get_usize() -> usize {
     0
 }
 fn get_struct() -> Struct {
@@ -117,4 +117,16 @@ fn main() {
     'label: {
         break 'label
     };
+    let () = const {
+        [42, 55][get_usize()];
+    };
+}
+
+const _: () = {
+    [42, 55][get_usize()];
+};
+
+const fn foo() {
+    [42, 55][get_usize()];
+    //~^ ERROR: unnecessary operation
 }
diff --git a/src/tools/clippy/tests/ui/unnecessary_operation.stderr b/src/tools/clippy/tests/ui/unnecessary_operation.stderr
index 27be5e6f4b922..036a9a44bbad0 100644
--- a/src/tools/clippy/tests/ui/unnecessary_operation.stderr
+++ b/src/tools/clippy/tests/ui/unnecessary_operation.stderr
@@ -119,5 +119,11 @@ LL | |         s: String::from("blah"),
 LL | |     };
    | |______^ help: statement can be reduced to: `String::from("blah");`
 
-error: aborting due to 19 previous errors
+error: unnecessary operation
+  --> tests/ui/unnecessary_operation.rs:130:5
+   |
+LL |     [42, 55][get_usize()];
+   |     ^^^^^^^^^^^^^^^^^^^^^^ help: statement can be written as: `assert!([42, 55].len() > get_usize());`
+
+error: aborting due to 20 previous errors
 
diff --git a/src/tools/clippy/tests/ui/unnecessary_to_owned.fixed b/src/tools/clippy/tests/ui/unnecessary_to_owned.fixed
index 1afa5ab54c461..fdcac8fb08dcf 100644
--- a/src/tools/clippy/tests/ui/unnecessary_to_owned.fixed
+++ b/src/tools/clippy/tests/ui/unnecessary_to_owned.fixed
@@ -157,6 +157,25 @@ fn main() {
     require_path(&std::path::PathBuf::from("x"));
     require_str(&String::from("x"));
     require_slice(&[String::from("x")]);
+
+    let slice = [0u8; 1024];
+    let _ref_str: &str = core::str::from_utf8(&slice).expect("not UTF-8");
+    let _ref_str: &str = core::str::from_utf8(b"foo").unwrap();
+    let _ref_str: &str = core::str::from_utf8(b"foo".as_slice()).unwrap();
+    // Expression is of type `&String`, can't suggest `str::from_utf8` here
+    let _ref_string = &String::from_utf8(b"foo".to_vec()).unwrap();
+    macro_rules! arg_from_macro {
+        () => {
+            b"foo".to_vec()
+        };
+    }
+    macro_rules! string_from_utf8_from_macro {
+        () => {
+            &String::from_utf8(b"foo".to_vec()).unwrap()
+        };
+    }
+    let _ref_str: &str = &String::from_utf8(arg_from_macro!()).unwrap();
+    let _ref_str: &str = string_from_utf8_from_macro!();
 }
 
 fn require_c_str(_: &CStr) {}
diff --git a/src/tools/clippy/tests/ui/unnecessary_to_owned.rs b/src/tools/clippy/tests/ui/unnecessary_to_owned.rs
index aa88dde43bf66..10a9727a9a798 100644
--- a/src/tools/clippy/tests/ui/unnecessary_to_owned.rs
+++ b/src/tools/clippy/tests/ui/unnecessary_to_owned.rs
@@ -157,6 +157,25 @@ fn main() {
     require_path(&std::path::PathBuf::from("x").to_path_buf());
     require_str(&String::from("x").to_string());
     require_slice(&[String::from("x")].to_owned());
+
+    let slice = [0u8; 1024];
+    let _ref_str: &str = &String::from_utf8(slice.to_vec()).expect("not UTF-8");
+    let _ref_str: &str = &String::from_utf8(b"foo".to_vec()).unwrap();
+    let _ref_str: &str = &String::from_utf8(b"foo".as_slice().to_owned()).unwrap();
+    // Expression is of type `&String`, can't suggest `str::from_utf8` here
+    let _ref_string = &String::from_utf8(b"foo".to_vec()).unwrap();
+    macro_rules! arg_from_macro {
+        () => {
+            b"foo".to_vec()
+        };
+    }
+    macro_rules! string_from_utf8_from_macro {
+        () => {
+            &String::from_utf8(b"foo".to_vec()).unwrap()
+        };
+    }
+    let _ref_str: &str = &String::from_utf8(arg_from_macro!()).unwrap();
+    let _ref_str: &str = string_from_utf8_from_macro!();
 }
 
 fn require_c_str(_: &CStr) {}
diff --git a/src/tools/clippy/tests/ui/unnecessary_to_owned.stderr b/src/tools/clippy/tests/ui/unnecessary_to_owned.stderr
index 2829f3cd6e980..511b4ae119f8a 100644
--- a/src/tools/clippy/tests/ui/unnecessary_to_owned.stderr
+++ b/src/tools/clippy/tests/ui/unnecessary_to_owned.stderr
@@ -477,8 +477,44 @@ error: unnecessary use of `to_owned`
 LL |     let _ = IntoIterator::into_iter([std::path::PathBuf::new()][..].to_owned());
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `[std::path::PathBuf::new()][..].iter().cloned()`
 
+error: allocating a new `String` only to create a temporary `&str` from it
+  --> tests/ui/unnecessary_to_owned.rs:162:26
+   |
+LL |     let _ref_str: &str = &String::from_utf8(slice.to_vec()).expect("not UTF-8");
+   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: convert from `&[u8]` to `&str` directly
+   |
+LL -     let _ref_str: &str = &String::from_utf8(slice.to_vec()).expect("not UTF-8");
+LL +     let _ref_str: &str = core::str::from_utf8(&slice).expect("not UTF-8");
+   |
+
+error: allocating a new `String` only to create a temporary `&str` from it
+  --> tests/ui/unnecessary_to_owned.rs:163:26
+   |
+LL |     let _ref_str: &str = &String::from_utf8(b"foo".to_vec()).unwrap();
+   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: convert from `&[u8]` to `&str` directly
+   |
+LL -     let _ref_str: &str = &String::from_utf8(b"foo".to_vec()).unwrap();
+LL +     let _ref_str: &str = core::str::from_utf8(b"foo").unwrap();
+   |
+
+error: allocating a new `String` only to create a temporary `&str` from it
+  --> tests/ui/unnecessary_to_owned.rs:164:26
+   |
+LL |     let _ref_str: &str = &String::from_utf8(b"foo".as_slice().to_owned()).unwrap();
+   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: convert from `&[u8]` to `&str` directly
+   |
+LL -     let _ref_str: &str = &String::from_utf8(b"foo".as_slice().to_owned()).unwrap();
+LL +     let _ref_str: &str = core::str::from_utf8(b"foo".as_slice()).unwrap();
+   |
+
 error: unnecessary use of `to_vec`
-  --> tests/ui/unnecessary_to_owned.rs:202:14
+  --> tests/ui/unnecessary_to_owned.rs:221:14
    |
 LL |     for t in file_types.to_vec() {
    |              ^^^^^^^^^^^^^^^^^^^
@@ -494,64 +530,64 @@ LL +         let path = match get_file_path(t) {
    |
 
 error: unnecessary use of `to_vec`
-  --> tests/ui/unnecessary_to_owned.rs:225:14
+  --> tests/ui/unnecessary_to_owned.rs:244:14
    |
 LL |     let _ = &["x"][..].to_vec().into_iter();
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().cloned()`
 
 error: unnecessary use of `to_vec`
-  --> tests/ui/unnecessary_to_owned.rs:230:14
+  --> tests/ui/unnecessary_to_owned.rs:249:14
    |
 LL |     let _ = &["x"][..].to_vec().into_iter();
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().copied()`
 
 error: unnecessary use of `to_string`
-  --> tests/ui/unnecessary_to_owned.rs:278:24
+  --> tests/ui/unnecessary_to_owned.rs:297:24
    |
 LL |         Box::new(build(y.to_string()))
    |                        ^^^^^^^^^^^^^ help: use: `y`
 
 error: unnecessary use of `to_string`
-  --> tests/ui/unnecessary_to_owned.rs:387:12
+  --> tests/ui/unnecessary_to_owned.rs:406:12
    |
 LL |         id("abc".to_string())
    |            ^^^^^^^^^^^^^^^^^ help: use: `"abc"`
 
 error: unnecessary use of `to_vec`
-  --> tests/ui/unnecessary_to_owned.rs:530:37
+  --> tests/ui/unnecessary_to_owned.rs:549:37
    |
 LL |         IntoFuture::into_future(foo([].to_vec(), &0));
    |                                     ^^^^^^^^^^^ help: use: `[]`
 
 error: unnecessary use of `to_vec`
-  --> tests/ui/unnecessary_to_owned.rs:540:18
+  --> tests/ui/unnecessary_to_owned.rs:559:18
    |
 LL |         s.remove(&a.to_vec());
    |                  ^^^^^^^^^^^ help: replace it with: `a`
 
 error: unnecessary use of `to_owned`
-  --> tests/ui/unnecessary_to_owned.rs:544:14
+  --> tests/ui/unnecessary_to_owned.rs:563:14
    |
 LL |     s.remove(&"b".to_owned());
    |              ^^^^^^^^^^^^^^^ help: replace it with: `"b"`
 
 error: unnecessary use of `to_string`
-  --> tests/ui/unnecessary_to_owned.rs:545:14
+  --> tests/ui/unnecessary_to_owned.rs:564:14
    |
 LL |     s.remove(&"b".to_string());
    |              ^^^^^^^^^^^^^^^^ help: replace it with: `"b"`
 
 error: unnecessary use of `to_vec`
-  --> tests/ui/unnecessary_to_owned.rs:550:14
+  --> tests/ui/unnecessary_to_owned.rs:569:14
    |
 LL |     s.remove(&["b"].to_vec());
    |              ^^^^^^^^^^^^^^^ help: replace it with: `["b"].as_slice()`
 
 error: unnecessary use of `to_vec`
-  --> tests/ui/unnecessary_to_owned.rs:551:14
+  --> tests/ui/unnecessary_to_owned.rs:570:14
    |
 LL |     s.remove(&(&["b"]).to_vec());
    |              ^^^^^^^^^^^^^^^^^^ help: replace it with: `(&["b"]).as_slice()`
 
-error: aborting due to 85 previous errors
+error: aborting due to 88 previous errors
 
diff --git a/src/tools/clippy/tests/ui/wildcard_imports.fixed b/src/tools/clippy/tests/ui/wildcard_imports.fixed
index 6fdd728b9b72e..46890ee9213f1 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports.fixed
+++ b/src/tools/clippy/tests/ui/wildcard_imports.fixed
@@ -204,6 +204,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass {
         use super::*;
 
@@ -212,6 +213,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_inside_function {
         fn with_super_inside_function() {
             use super::*;
@@ -219,6 +221,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_further_inside {
         fn insidefoo() {}
         mod inner {
diff --git a/src/tools/clippy/tests/ui/wildcard_imports.rs b/src/tools/clippy/tests/ui/wildcard_imports.rs
index 20e06d4b36641..1a5586cbb88d9 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports.rs
+++ b/src/tools/clippy/tests/ui/wildcard_imports.rs
@@ -205,6 +205,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass {
         use super::*;
 
@@ -213,6 +214,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_inside_function {
         fn with_super_inside_function() {
             use super::*;
@@ -220,6 +222,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_further_inside {
         fn insidefoo() {}
         mod inner {
diff --git a/src/tools/clippy/tests/ui/wildcard_imports.stderr b/src/tools/clippy/tests/ui/wildcard_imports.stderr
index 0c69d5262c26f..8e88f216394d2 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports.stderr
+++ b/src/tools/clippy/tests/ui/wildcard_imports.stderr
@@ -106,31 +106,31 @@ LL |         use super::*;
    |             ^^^^^^^^ help: try: `super::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports.rs:236:17
+  --> tests/ui/wildcard_imports.rs:239:17
    |
 LL |             use super::*;
    |                 ^^^^^^^^ help: try: `super::insidefoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports.rs:244:13
+  --> tests/ui/wildcard_imports.rs:247:13
    |
 LL |         use crate::super_imports::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `crate::super_imports::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports.rs:253:17
+  --> tests/ui/wildcard_imports.rs:256:17
    |
 LL |             use super::super::*;
    |                 ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports.rs:262:13
+  --> tests/ui/wildcard_imports.rs:265:13
    |
 LL |         use super::super::super_imports::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::super_imports::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports.rs:270:13
+  --> tests/ui/wildcard_imports.rs:273:13
    |
 LL |         use super::*;
    |             ^^^^^^^^ help: try: `super::foofoo`
diff --git a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.fixed b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.fixed
index 6a9fe007d654d..197dd3b94df09 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.fixed
+++ b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.fixed
@@ -198,6 +198,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass {
         use super::*;
 
@@ -206,6 +207,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_inside_function {
         fn with_super_inside_function() {
             use super::*;
@@ -213,6 +215,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_further_inside {
         fn insidefoo() {}
         mod inner {
diff --git a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.stderr b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.stderr
index 11e0bd377692d..66adacd95dcc1 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.stderr
+++ b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2018.stderr
@@ -106,31 +106,31 @@ LL |         use super::*;
    |             ^^^^^^^^ help: try: `super::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:230:17
+  --> tests/ui/wildcard_imports_2021.rs:233:17
    |
 LL |             use super::*;
    |                 ^^^^^^^^ help: try: `super::insidefoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:238:13
+  --> tests/ui/wildcard_imports_2021.rs:241:13
    |
 LL |         use crate::super_imports::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `crate::super_imports::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:247:17
+  --> tests/ui/wildcard_imports_2021.rs:250:17
    |
 LL |             use super::super::*;
    |                 ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:256:13
+  --> tests/ui/wildcard_imports_2021.rs:259:13
    |
 LL |         use super::super::super_imports::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::super_imports::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:264:13
+  --> tests/ui/wildcard_imports_2021.rs:267:13
    |
 LL |         use super::*;
    |             ^^^^^^^^ help: try: `super::foofoo`
diff --git a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.fixed b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.fixed
index 6a9fe007d654d..197dd3b94df09 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.fixed
+++ b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.fixed
@@ -198,6 +198,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass {
         use super::*;
 
@@ -206,6 +207,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_inside_function {
         fn with_super_inside_function() {
             use super::*;
@@ -213,6 +215,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_further_inside {
         fn insidefoo() {}
         mod inner {
diff --git a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.stderr b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.stderr
index 11e0bd377692d..66adacd95dcc1 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.stderr
+++ b/src/tools/clippy/tests/ui/wildcard_imports_2021.edition2021.stderr
@@ -106,31 +106,31 @@ LL |         use super::*;
    |             ^^^^^^^^ help: try: `super::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:230:17
+  --> tests/ui/wildcard_imports_2021.rs:233:17
    |
 LL |             use super::*;
    |                 ^^^^^^^^ help: try: `super::insidefoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:238:13
+  --> tests/ui/wildcard_imports_2021.rs:241:13
    |
 LL |         use crate::super_imports::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `crate::super_imports::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:247:17
+  --> tests/ui/wildcard_imports_2021.rs:250:17
    |
 LL |             use super::super::*;
    |                 ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:256:13
+  --> tests/ui/wildcard_imports_2021.rs:259:13
    |
 LL |         use super::super::super_imports::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::super_imports::foofoo`
 
 error: usage of wildcard import
-  --> tests/ui/wildcard_imports_2021.rs:264:13
+  --> tests/ui/wildcard_imports_2021.rs:267:13
    |
 LL |         use super::*;
    |             ^^^^^^^^ help: try: `super::foofoo`
diff --git a/src/tools/clippy/tests/ui/wildcard_imports_2021.rs b/src/tools/clippy/tests/ui/wildcard_imports_2021.rs
index 18ebc0f512741..606ff080e774b 100644
--- a/src/tools/clippy/tests/ui/wildcard_imports_2021.rs
+++ b/src/tools/clippy/tests/ui/wildcard_imports_2021.rs
@@ -199,6 +199,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass {
         use super::*;
 
@@ -207,6 +208,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_inside_function {
         fn with_super_inside_function() {
             use super::*;
@@ -214,6 +216,7 @@ mod super_imports {
         }
     }
 
+    #[cfg(test)]
     mod test_should_pass_further_inside {
         fn insidefoo() {}
         mod inner {
diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs
index 63d1efd42fae1..7f5d4f4b41690 100644
--- a/src/tools/compiletest/src/header.rs
+++ b/src/tools/compiletest/src/header.rs
@@ -991,13 +991,19 @@ impl Config {
     }
 
     fn parse_custom_normalization(&self, line: &str, prefix: &str) -> Option<(String, String)> {
-        if parse_cfg_name_directive(self, line, prefix).outcome == MatchOutcome::Match {
-            let (regex, replacement) = parse_normalize_rule(line)
-                .unwrap_or_else(|| panic!("couldn't parse custom normalization rule: `{line}`"));
-            Some((regex, replacement))
-        } else {
-            None
+        let parsed = parse_cfg_name_directive(self, line, prefix);
+        if parsed.outcome != MatchOutcome::Match {
+            return None;
         }
+        let name = parsed.name.expect("successful match always has a name");
+
+        let Some((regex, replacement)) = parse_normalize_rule(line) else {
+            panic!(
+                "couldn't parse custom normalization rule: `{line}`\n\
+                help: expected syntax is: `{prefix}-{name}: \"REGEX\" -> \"REPLACEMENT\"`"
+            );
+        };
+        Some((regex, replacement))
     }
 
     fn parse_name_directive(&self, line: &str, directive: &str) -> bool {
@@ -1121,13 +1127,11 @@ fn expand_variables(mut value: String, config: &Config) -> String {
 /// normalize-*: "REGEX" -> "REPLACEMENT"
 /// ```
 fn parse_normalize_rule(header: &str) -> Option<(String, String)> {
-    // FIXME(#126370): A colon after the header name should be mandatory, but
-    // currently is not, and there are many tests that lack the colon.
     // FIXME: Support escaped double-quotes in strings.
     let captures = static_regex!(
         r#"(?x) # (verbose mode regex)
         ^
-        [^:\s]+:?\s*            # (header name followed by optional colon)
+        [^:\s]+:\s*             # (header name followed by colon)
         "(?<regex>[^"]*)"       # "REGEX"
         \s+->\s+                # ->
         "(?<replacement>[^"]*)" # "REPLACEMENT"
diff --git a/src/tools/compiletest/src/header/tests.rs b/src/tools/compiletest/src/header/tests.rs
index 61a85b84ad64c..c790eb18d67c4 100644
--- a/src/tools/compiletest/src/header/tests.rs
+++ b/src/tools/compiletest/src/header/tests.rs
@@ -33,20 +33,11 @@ fn make_test_description<R: Read>(
 
 #[test]
 fn test_parse_normalize_rule() {
-    let good_data = &[
-        (
-            r#"normalize-stderr-32bit: "something (32 bits)" -> "something ($WORD bits)""#,
-            "something (32 bits)",
-            "something ($WORD bits)",
-        ),
-        // FIXME(#126370): A colon after the header name should be mandatory,
-        // but currently is not, and there are many tests that lack the colon.
-        (
-            r#"normalize-stderr-32bit "something (32 bits)" -> "something ($WORD bits)""#,
-            "something (32 bits)",
-            "something ($WORD bits)",
-        ),
-    ];
+    let good_data = &[(
+        r#"normalize-stderr-32bit: "something (32 bits)" -> "something ($WORD bits)""#,
+        "something (32 bits)",
+        "something ($WORD bits)",
+    )];
 
     for &(input, expected_regex, expected_replacement) in good_data {
         let parsed = parse_normalize_rule(input);
@@ -56,6 +47,7 @@ fn test_parse_normalize_rule() {
     }
 
     let bad_data = &[
+        r#"normalize-stderr-32bit "something (32 bits)" -> "something ($WORD bits)""#,
         r#"normalize-stderr-16bit: something (16 bits) -> something ($WORD bits)"#,
         r#"normalize-stderr-32bit: something (32 bits) -> something ($WORD bits)"#,
         r#"normalize-stderr-32bit: "something (32 bits) -> something ($WORD bits)"#,
diff --git a/src/tools/miri/tests/pass/intptrcast.rs b/src/tools/miri/tests/pass/intptrcast.rs
index 4e9fa12c18142..fb1a1dfae5d14 100644
--- a/src/tools/miri/tests/pass/intptrcast.rs
+++ b/src/tools/miri/tests/pass/intptrcast.rs
@@ -35,7 +35,7 @@ fn cast_dangling() {
 fn format() {
     // Pointer string formatting! We can't check the output as it changes when libstd changes,
     // but we can make sure Miri does not error.
-    format!("{:?}", &mut 13 as *mut _);
+    let _ = format!("{:?}", &mut 13 as *mut _);
 }
 
 fn transmute() {
@@ -52,7 +52,7 @@ fn ptr_bitops1() {
     let one = bytes.as_ptr().wrapping_offset(1);
     let three = bytes.as_ptr().wrapping_offset(3);
     let res = (one as usize) | (three as usize);
-    format!("{}", res);
+    let _ = format!("{}", res);
 }
 
 fn ptr_bitops2() {
diff --git a/src/tools/miri/tests/pass/packed_struct.rs b/src/tools/miri/tests/pass/packed_struct.rs
index b86235e0c67f3..039eb5adef09f 100644
--- a/src/tools/miri/tests/pass/packed_struct.rs
+++ b/src/tools/miri/tests/pass/packed_struct.rs
@@ -138,7 +138,7 @@ fn test_derive() {
     assert_eq!(x.partial_cmp(&y).unwrap(), x.cmp(&y));
     x.hash(&mut DefaultHasher::new());
     P::default();
-    format!("{:?}", x);
+    let _ = format!("{:?}", x);
 }
 
 fn main() {
diff --git a/src/tools/miri/tests/pass/shims/fs.rs b/src/tools/miri/tests/pass/shims/fs.rs
index 35980fad15dd0..16d3e8cab30ab 100644
--- a/src/tools/miri/tests/pass/shims/fs.rs
+++ b/src/tools/miri/tests/pass/shims/fs.rs
@@ -202,7 +202,7 @@ fn test_errors() {
     // Opening a non-existing file should fail with a "not found" error.
     assert_eq!(ErrorKind::NotFound, File::open(&path).unwrap_err().kind());
     // Make sure we can also format this.
-    format!("{0}: {0:?}", File::open(&path).unwrap_err());
+    let _ = format!("{0}: {0:?}", File::open(&path).unwrap_err());
     // Removing a non-existing file should fail with a "not found" error.
     assert_eq!(ErrorKind::NotFound, remove_file(&path).unwrap_err().kind());
     // Reading the metadata of a non-existing file should fail with a "not found" error.
@@ -301,5 +301,5 @@ fn test_from_raw_os_error() {
     let error = Error::from_raw_os_error(code);
     assert!(matches!(error.kind(), ErrorKind::Uncategorized));
     // Make sure we can also format this.
-    format!("{error:?}");
+    let _ = format!("{error:?}");
 }
diff --git a/src/tools/miri/tests/pass/shims/io.rs b/src/tools/miri/tests/pass/shims/io.rs
index d20fc75b79355..420ef95a0cbf4 100644
--- a/src/tools/miri/tests/pass/shims/io.rs
+++ b/src/tools/miri/tests/pass/shims/io.rs
@@ -15,5 +15,5 @@ fn main() {
         panic!("unsupported OS")
     };
     let err = io::Error::from_raw_os_error(raw_os_error);
-    format!("{err}: {err:?}");
+    let _ = format!("{err}: {err:?}");
 }
diff --git a/src/tools/miri/tests/pass/vecdeque.rs b/src/tools/miri/tests/pass/vecdeque.rs
index 77c4ca5a04e6a..9153c428e184d 100644
--- a/src/tools/miri/tests/pass/vecdeque.rs
+++ b/src/tools/miri/tests/pass/vecdeque.rs
@@ -31,8 +31,8 @@ fn main() {
     }
 
     // Regression test for Debug impl's
-    format!("{:?} {:?}", dst, dst.iter());
-    format!("{:?}", VecDeque::<u32>::new().iter());
+    let _ = format!("{:?} {:?}", dst, dst.iter());
+    let _ = format!("{:?}", VecDeque::<u32>::new().iter());
 
     for a in dst {
         assert_eq!(*a, 2);
diff --git a/src/tools/run-make-support/src/fs_wrapper.rs b/src/tools/run-make-support/src/fs_wrapper.rs
index 8a2bfce8b4a72..0f0d6f6618ced 100644
--- a/src/tools/run-make-support/src/fs_wrapper.rs
+++ b/src/tools/run-make-support/src/fs_wrapper.rs
@@ -1,7 +1,7 @@
 use std::fs;
 use std::path::Path;
 
-/// A wrapper around [`std::fs::remove_file`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::remove_file`] which includes the file path in the panic message.
 #[track_caller]
 pub fn remove_file<P: AsRef<Path>>(path: P) {
     fs::remove_file(path.as_ref())
@@ -18,21 +18,21 @@ pub fn copy<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) {
     ));
 }
 
-/// A wrapper around [`std::fs::File::create`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::File::create`] which includes the file path in the panic message.
 #[track_caller]
 pub fn create_file<P: AsRef<Path>>(path: P) {
     fs::File::create(path.as_ref())
         .expect(&format!("the file in path \"{}\" could not be created", path.as_ref().display()));
 }
 
-/// A wrapper around [`std::fs::read`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::read`] which includes the file path in the panic message.
 #[track_caller]
 pub fn read<P: AsRef<Path>>(path: P) -> Vec<u8> {
     fs::read(path.as_ref())
         .expect(&format!("the file in path \"{}\" could not be read", path.as_ref().display()))
 }
 
-/// A wrapper around [`std::fs::read_to_string`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::read_to_string`] which includes the file path in the panic message.
 #[track_caller]
 pub fn read_to_string<P: AsRef<Path>>(path: P) -> String {
     fs::read_to_string(path.as_ref()).expect(&format!(
@@ -41,14 +41,14 @@ pub fn read_to_string<P: AsRef<Path>>(path: P) -> String {
     ))
 }
 
-/// A wrapper around [`std::fs::read_dir`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::read_dir`] which includes the file path in the panic message.
 #[track_caller]
 pub fn read_dir<P: AsRef<Path>>(path: P) -> fs::ReadDir {
     fs::read_dir(path.as_ref())
         .expect(&format!("the directory in path \"{}\" could not be read", path.as_ref().display()))
 }
 
-/// A wrapper around [`std::fs::write`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::write`] which includes the file path in the panic message.
 #[track_caller]
 pub fn write<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) {
     fs::write(path.as_ref(), contents.as_ref()).expect(&format!(
@@ -57,7 +57,7 @@ pub fn write<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) {
     ));
 }
 
-/// A wrapper around [`std::fs::remove_dir_all`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::remove_dir_all`] which includes the file path in the panic message.
 #[track_caller]
 pub fn remove_dir_all<P: AsRef<Path>>(path: P) {
     fs::remove_dir_all(path.as_ref()).expect(&format!(
@@ -66,7 +66,7 @@ pub fn remove_dir_all<P: AsRef<Path>>(path: P) {
     ));
 }
 
-/// A wrapper around [`std::fs::create_dir`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::create_dir`] which includes the file path in the panic message.
 #[track_caller]
 pub fn create_dir<P: AsRef<Path>>(path: P) {
     fs::create_dir(path.as_ref()).expect(&format!(
@@ -75,7 +75,7 @@ pub fn create_dir<P: AsRef<Path>>(path: P) {
     ));
 }
 
-/// A wrapper around [`std::fs::create_dir_all`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::create_dir_all`] which includes the file path in the panic message.
 #[track_caller]
 pub fn create_dir_all<P: AsRef<Path>>(path: P) {
     fs::create_dir_all(path.as_ref()).expect(&format!(
@@ -84,7 +84,7 @@ pub fn create_dir_all<P: AsRef<Path>>(path: P) {
     ));
 }
 
-/// A wrapper around [`std::fs::metadata`] which includes the file path in the panic message..
+/// A wrapper around [`std::fs::metadata`] which includes the file path in the panic message.
 #[track_caller]
 pub fn metadata<P: AsRef<Path>>(path: P) -> fs::Metadata {
     fs::metadata(path.as_ref()).expect(&format!(
diff --git a/src/tools/run-make-support/src/lib.rs b/src/tools/run-make-support/src/lib.rs
index f464a109e7711..04b6fd2d6c18d 100644
--- a/src/tools/run-make-support/src/lib.rs
+++ b/src/tools/run-make-support/src/lib.rs
@@ -35,7 +35,7 @@ pub use llvm::{
     LlvmProfdata, LlvmReadobj,
 };
 pub use run::{cmd, run, run_fail, run_with_args};
-pub use rustc::{aux_build, rustc, Rustc};
+pub use rustc::{aux_build, bare_rustc, rustc, Rustc};
 pub use rustdoc::{bare_rustdoc, rustdoc, Rustdoc};
 
 #[track_caller]
@@ -303,6 +303,25 @@ pub fn filename_not_in_denylist<P: AsRef<Path>, V: AsRef<[String]>>(path: P, exp
         .is_some_and(|name| !expected.contains(&name.to_str().unwrap().to_owned()))
 }
 
+/// Returns true if the filename at `path` ends with `suffix`.
+pub fn has_suffix<P: AsRef<Path>>(path: P, suffix: &str) -> bool {
+    path.as_ref().file_name().is_some_and(|name| name.to_str().unwrap().ends_with(suffix))
+}
+
+/// Gathers all files in the current working directory that have the extension `ext`, and counts
+/// the number of lines within that contain a match with the regex pattern `re`.
+pub fn count_regex_matches_in_files_with_extension(re: &regex::Regex, ext: &str) -> usize {
+    let fetched_files = shallow_find_files(cwd(), |path| has_extension(path, ext));
+
+    let mut count = 0;
+    for file in fetched_files {
+        let content = fs_wrapper::read_to_string(file);
+        count += content.lines().filter(|line| re.is_match(&line)).count();
+    }
+
+    count
+}
+
 /// Use `cygpath -w` on a path to get a Windows path string back. This assumes that `cygpath` is
 /// available on the platform!
 #[track_caller]
diff --git a/src/tools/run-make-support/src/rustc.rs b/src/tools/run-make-support/src/rustc.rs
index 885b361f72a3f..a2a7c8064dca1 100644
--- a/src/tools/run-make-support/src/rustc.rs
+++ b/src/tools/run-make-support/src/rustc.rs
@@ -10,6 +10,12 @@ pub fn rustc() -> Rustc {
     Rustc::new()
 }
 
+/// Construct a plain `rustc` invocation with no flags set.
+#[track_caller]
+pub fn bare_rustc() -> Rustc {
+    Rustc::bare()
+}
+
 /// Construct a new `rustc` aux-build invocation.
 #[track_caller]
 pub fn aux_build() -> Rustc {
@@ -30,7 +36,6 @@ fn setup_common() -> Command {
     let rustc = env_var("RUSTC");
     let mut cmd = Command::new(rustc);
     set_host_rpath(&mut cmd);
-    cmd.arg("-L").arg(cwd());
     cmd
 }
 
@@ -40,6 +45,14 @@ impl Rustc {
     /// Construct a new `rustc` invocation.
     #[track_caller]
     pub fn new() -> Self {
+        let mut cmd = setup_common();
+        cmd.arg("-L").arg(cwd());
+        Self { cmd }
+    }
+
+    /// Construct a bare `rustc` invocation with no flags set.
+    #[track_caller]
+    pub fn bare() -> Self {
         let cmd = setup_common();
         Self { cmd }
     }
diff --git a/src/tools/rust-analyzer/crates/stdx/src/anymap.rs b/src/tools/rust-analyzer/crates/stdx/src/anymap.rs
index d189b56a468fc..4eafcfb060f22 100644
--- a/src/tools/rust-analyzer/crates/stdx/src/anymap.rs
+++ b/src/tools/rust-analyzer/crates/stdx/src/anymap.rs
@@ -68,8 +68,6 @@ pub type RawMap<A> = hash_map::HashMap<TypeId, Box<A>, BuildHasherDefault<TypeId
 /// The type parameter `A` allows you to use a different value type; normally you will want
 /// it to be `core::any::Any` (also known as `std::any::Any`), but there are other choices:
 ///
-/// - If you want the entire map to be cloneable, use `CloneAny` instead of `Any`; with
-///   that, you can only add types that implement `Clone` to the map.
 /// - You can add on `+ Send` or `+ Send + Sync` (e.g. `Map<dyn Any + Send>`) to add those
 ///   auto traits.
 ///
@@ -79,9 +77,6 @@ pub type RawMap<A> = hash_map::HashMap<TypeId, Box<A>, BuildHasherDefault<TypeId
 ///   also spelled [`AnyMap`] for convenience.
 /// - <code>[Map]&lt;dyn [core::any::Any] + Send&gt;</code>
 /// - <code>[Map]&lt;dyn [core::any::Any] + Send + Sync&gt;</code>
-/// - <code>[Map]&lt;dyn [CloneAny]&gt;</code>
-/// - <code>[Map]&lt;dyn [CloneAny] + Send&gt;</code>
-/// - <code>[Map]&lt;dyn [CloneAny] + Send + Sync&gt;</code>
 ///
 /// ## Example
 ///
@@ -205,12 +200,6 @@ mod tests {
         assert_debug::<Map<dyn Any>>();
         assert_debug::<Map<dyn Any + Send>>();
         assert_debug::<Map<dyn Any + Send + Sync>>();
-        assert_send::<Map<dyn CloneAny + Send>>();
-        assert_send::<Map<dyn CloneAny + Send + Sync>>();
-        assert_sync::<Map<dyn CloneAny + Send + Sync>>();
-        assert_debug::<Map<dyn CloneAny>>();
-        assert_debug::<Map<dyn CloneAny + Send>>();
-        assert_debug::<Map<dyn CloneAny + Send + Sync>>();
     }
 
     #[test]
@@ -232,53 +221,6 @@ mod tests {
     }
 }
 
-// impl some traits for dyn Any
-use core::fmt;
-
-#[doc(hidden)]
-pub trait CloneToAny {
-    /// Clone `self` into a new `Box<dyn CloneAny>` object.
-    fn clone_to_any(&self) -> Box<dyn CloneAny>;
-}
-
-impl<T: Any + Clone> CloneToAny for T {
-    #[inline]
-    fn clone_to_any(&self) -> Box<dyn CloneAny> {
-        Box::new(self.clone())
-    }
-}
-
-macro_rules! impl_clone {
-    ($t:ty) => {
-        impl Clone for Box<$t> {
-            #[inline]
-            fn clone(&self) -> Box<$t> {
-                // SAFETY: this dance is to reapply any Send/Sync marker. I’m not happy about this
-                // approach, given that I used to do it in safe code, but then came a dodgy
-                // future-compatibility warning where_clauses_object_safety, which is spurious for
-                // auto traits but still super annoying (future-compatibility lints seem to mean
-                // your bin crate needs a corresponding allow!). Although I explained my plight¹
-                // and it was all explained and agreed upon, no action has been taken. So I finally
-                // caved and worked around it by doing it this way, which matches what’s done for
-                // core::any², so it’s probably not *too* bad.
-                //
-                // ¹ https://github.com/rust-lang/rust/issues/51443#issuecomment-421988013
-                // ² https://github.com/rust-lang/rust/blob/e7825f2b690c9a0d21b6f6d84c404bb53b151b38/library/alloc/src/boxed.rs#L1613-L1616
-                let clone: Box<dyn CloneAny> = (**self).clone_to_any();
-                let raw: *mut dyn CloneAny = Box::into_raw(clone);
-                unsafe { Box::from_raw(raw as *mut $t) }
-            }
-        }
-
-        impl fmt::Debug for $t {
-            #[inline]
-            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-                f.pad(stringify!($t))
-            }
-        }
-    };
-}
-
 /// Methods for downcasting from an `Any`-like trait object.
 ///
 /// This should only be implemented on trait objects for subtraits of `Any`, though you can
@@ -350,16 +292,3 @@ macro_rules! implement {
 implement!(Any);
 implement!(Any + Send);
 implement!(Any + Send + Sync);
-
-/// [`Any`], but with cloning.
-///
-/// Every type with no non-`'static` references that implements `Clone` implements `CloneAny`.
-/// See [`core::any`] for more details on `Any` in general.
-pub trait CloneAny: Any + CloneToAny {}
-impl<T: Any + Clone> CloneAny for T {}
-implement!(CloneAny);
-implement!(CloneAny + Send);
-implement!(CloneAny + Send + Sync);
-impl_clone!(dyn CloneAny);
-impl_clone!(dyn CloneAny + Send);
-impl_clone!(dyn CloneAny + Send + Sync);
diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt
index 31cb32d349ace..07d047a481514 100644
--- a/src/tools/tidy/src/allowed_run_make_makefiles.txt
+++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt
@@ -9,7 +9,6 @@ run-make/c-unwind-abi-catch-lib-panic/Makefile
 run-make/c-unwind-abi-catch-panic/Makefile
 run-make/cat-and-grep-sanity-check/Makefile
 run-make/cdylib-dylib-linkage/Makefile
-run-make/cdylib-fewer-symbols/Makefile
 run-make/compiler-lookup-paths-2/Makefile
 run-make/compiler-lookup-paths/Makefile
 run-make/compiler-rt-works-on-mingw/Makefile
@@ -28,7 +27,6 @@ run-make/env-dep-info/Makefile
 run-make/export-executable-symbols/Makefile
 run-make/extern-diff-internal-name/Makefile
 run-make/extern-flag-disambiguates/Makefile
-run-make/extern-flag-pathless/Makefile
 run-make/extern-fn-explicit-align/Makefile
 run-make/extern-fn-generic/Makefile
 run-make/extern-fn-mangle/Makefile
@@ -39,7 +37,6 @@ run-make/extern-fn-with-packed-struct/Makefile
 run-make/extern-fn-with-union/Makefile
 run-make/extern-multiple-copies/Makefile
 run-make/extern-multiple-copies2/Makefile
-run-make/extra-filename-with-temp-outputs/Makefile
 run-make/fmt-write-bloat/Makefile
 run-make/foreign-double-unwind/Makefile
 run-make/foreign-exceptions/Makefile
@@ -47,9 +44,7 @@ run-make/foreign-rust-exceptions/Makefile
 run-make/incr-add-rust-src-component/Makefile
 run-make/incr-foreign-head-span/Makefile
 run-make/interdependent-c-libraries/Makefile
-run-make/intrinsic-unreachable/Makefile
 run-make/issue-107094/Makefile
-run-make/issue-109934-lto-debuginfo/Makefile
 run-make/issue-14698/Makefile
 run-make/issue-15460/Makefile
 run-make/issue-18943/Makefile
@@ -60,13 +55,10 @@ run-make/issue-28595/Makefile
 run-make/issue-33329/Makefile
 run-make/issue-35164/Makefile
 run-make/issue-36710/Makefile
-run-make/issue-37839/Makefile
 run-make/issue-47551/Makefile
 run-make/issue-69368/Makefile
 run-make/issue-83045/Makefile
-run-make/issue-83112-incr-test-moved-file/Makefile
 run-make/issue-84395-lto-embed-bitcode/Makefile
-run-make/issue-85019-moved-src-dir/Makefile
 run-make/issue-85401-static-mir/Makefile
 run-make/issue-88756-default-output/Makefile
 run-make/issue-97463-abi-param-passing/Makefile
@@ -88,7 +80,6 @@ run-make/lto-smoke-c/Makefile
 run-make/macos-deployment-target/Makefile
 run-make/macos-fat-archive/Makefile
 run-make/manual-link/Makefile
-run-make/metadata-dep-info/Makefile
 run-make/min-global-align/Makefile
 run-make/missing-crate-dependency/Makefile
 run-make/mixing-libs/Makefile
@@ -99,9 +90,6 @@ run-make/no-builtins-attribute/Makefile
 run-make/no-duplicate-libs/Makefile
 run-make/obey-crate-type-flag/Makefile
 run-make/panic-abort-eh_frame/Makefile
-run-make/pass-linker-flags-flavor/Makefile
-run-make/pass-linker-flags-from-dep/Makefile
-run-make/pass-linker-flags/Makefile
 run-make/pass-non-c-like-enum-to-c/Makefile
 run-make/pdb-buildinfo-cl-cmd/Makefile
 run-make/pgo-gen-lto/Makefile
@@ -130,11 +118,7 @@ run-make/rustc-macro-dep-files/Makefile
 run-make/sanitizer-cdylib-link/Makefile
 run-make/sanitizer-dylib-link/Makefile
 run-make/sanitizer-staticlib-link/Makefile
-run-make/sepcomp-cci-copies/Makefile
-run-make/sepcomp-inlining/Makefile
-run-make/sepcomp-separate/Makefile
 run-make/share-generics-dylib/Makefile
-run-make/silly-file-names/Makefile
 run-make/simd-ffi/Makefile
 run-make/split-debuginfo/Makefile
 run-make/stable-symbol-names/Makefile
@@ -145,17 +129,10 @@ run-make/staticlib-dylib-linkage/Makefile
 run-make/std-core-cycle/Makefile
 run-make/symbol-mangling-hashed/Makefile
 run-make/symbol-visibility/Makefile
-run-make/symbols-include-type-name/Makefile
 run-make/sysroot-crates-are-unstable/Makefile
-run-make/target-cpu-native/Makefile
-run-make/target-specs/Makefile
-run-make/target-without-atomic-cas/Makefile
 run-make/test-benches/Makefile
 run-make/thumb-none-cortex-m/Makefile
 run-make/thumb-none-qemu/Makefile
-run-make/track-path-dep-info/Makefile
-run-make/track-pgo-dep-info/Makefile
 run-make/translation/Makefile
-run-make/type-mismatch-same-crate-name/Makefile
 run-make/unstable-flag-required/Makefile
 run-make/x86_64-fortanix-unknown-sgx-lvi/Makefile
diff --git a/tests/coverage-run-rustdoc/doctest.coverage b/tests/coverage-run-rustdoc/doctest.coverage
index 1bbf364759ba1..396811c5487c1 100644
--- a/tests/coverage-run-rustdoc/doctest.coverage
+++ b/tests/coverage-run-rustdoc/doctest.coverage
@@ -34,10 +34,10 @@ $DIR/doctest.rs:
    LL|       |//!
    LL|       |//! doctest returning a result:
    LL|      1|//! ```
-   LL|      1|//! #[derive(Debug, PartialEq)]
-   LL|      1|//! struct SomeError {
-   LL|      1|//!     msg: String,
-   LL|      1|//! }
+   LL|       |//! #[derive(Debug, PartialEq)]
+   LL|       |//! struct SomeError {
+   LL|       |//!     msg: String,
+   LL|       |//! }
    LL|      1|//! let mut res = Err(SomeError { msg: String::from("a message") });
    LL|      1|//! if res.is_ok() {
    LL|      0|//!     res?;
diff --git a/tests/coverage/async.cov-map b/tests/coverage/async.cov-map
index 7d16372375a7b..9e5a4bdc60fdd 100644
--- a/tests/coverage/async.cov-map
+++ b/tests/coverage/async.cov-map
@@ -167,15 +167,16 @@ Number of file 0 mappings: 14
     = ((c6 + c7) + c8)
 
 Function name: async::j
-Raw bytes (53): 0x[01, 01, 02, 07, 0d, 05, 09, 09, 01, 35, 01, 13, 0c, 05, 14, 09, 00, 0a, 01, 00, 0e, 00, 1b, 05, 00, 1f, 00, 27, 09, 01, 09, 00, 0a, 11, 00, 0e, 00, 1a, 09, 00, 1e, 00, 20, 0d, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
+Raw bytes (58): 0x[01, 01, 02, 07, 0d, 05, 09, 0a, 01, 35, 01, 00, 0d, 01, 0b, 0b, 00, 0c, 05, 01, 09, 00, 0a, 01, 00, 0e, 00, 1b, 05, 00, 1f, 00, 27, 09, 01, 09, 00, 0a, 11, 00, 0e, 00, 1a, 09, 00, 1e, 00, 20, 0d, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 2
 - expression 0 operands: lhs = Expression(1, Add), rhs = Counter(3)
 - expression 1 operands: lhs = Counter(1), rhs = Counter(2)
-Number of file 0 mappings: 9
-- Code(Counter(0)) at (prev + 53, 1) to (start + 19, 12)
-- Code(Counter(1)) at (prev + 20, 9) to (start + 0, 10)
+Number of file 0 mappings: 10
+- Code(Counter(0)) at (prev + 53, 1) to (start + 0, 13)
+- Code(Counter(0)) at (prev + 11, 11) to (start + 0, 12)
+- Code(Counter(1)) at (prev + 1, 9) to (start + 0, 10)
 - Code(Counter(0)) at (prev + 0, 14) to (start + 0, 27)
 - Code(Counter(1)) at (prev + 0, 31) to (start + 0, 39)
 - Code(Counter(2)) at (prev + 1, 9) to (start + 0, 10)
@@ -186,7 +187,7 @@ Number of file 0 mappings: 9
     = ((c1 + c2) + c3)
 
 Function name: async::j::c
-Raw bytes (26): 0x[01, 01, 01, 01, 05, 04, 01, 37, 05, 01, 12, 05, 02, 0d, 00, 0e, 02, 0a, 0d, 00, 0e, 01, 02, 05, 00, 06]
+Raw bytes (26): 0x[01, 01, 01, 01, 05, 04, 01, 37, 05, 01, 12, 05, 02, 0d, 00, 0e, 02, 02, 0d, 00, 0e, 01, 02, 05, 00, 06]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 1
@@ -194,40 +195,40 @@ Number of expressions: 1
 Number of file 0 mappings: 4
 - Code(Counter(0)) at (prev + 55, 5) to (start + 1, 18)
 - Code(Counter(1)) at (prev + 2, 13) to (start + 0, 14)
-- Code(Expression(0, Sub)) at (prev + 10, 13) to (start + 0, 14)
+- Code(Expression(0, Sub)) at (prev + 2, 13) to (start + 0, 14)
     = (c0 - c1)
 - Code(Counter(0)) at (prev + 2, 5) to (start + 0, 6)
 
 Function name: async::j::d
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 46, 05, 00, 17]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 3e, 05, 00, 17]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 70, 5) to (start + 0, 23)
+- Code(Counter(0)) at (prev + 62, 5) to (start + 0, 23)
 
 Function name: async::j::f
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 47, 05, 00, 17]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 3f, 05, 00, 17]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 71, 5) to (start + 0, 23)
+- Code(Counter(0)) at (prev + 63, 5) to (start + 0, 23)
 
 Function name: async::k (unused)
-Raw bytes (29): 0x[01, 01, 00, 05, 00, 4f, 01, 01, 0c, 00, 02, 0e, 00, 10, 00, 01, 0e, 00, 10, 00, 01, 0e, 00, 10, 00, 02, 01, 00, 02]
+Raw bytes (29): 0x[01, 01, 00, 05, 00, 47, 01, 01, 0c, 00, 02, 0e, 00, 10, 00, 01, 0e, 00, 10, 00, 01, 0e, 00, 10, 00, 02, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 5
-- Code(Zero) at (prev + 79, 1) to (start + 1, 12)
+- Code(Zero) at (prev + 71, 1) to (start + 1, 12)
 - Code(Zero) at (prev + 2, 14) to (start + 0, 16)
 - Code(Zero) at (prev + 1, 14) to (start + 0, 16)
 - Code(Zero) at (prev + 1, 14) to (start + 0, 16)
 - Code(Zero) at (prev + 2, 1) to (start + 0, 2)
 
 Function name: async::l
-Raw bytes (37): 0x[01, 01, 04, 01, 07, 05, 09, 0f, 02, 09, 05, 05, 01, 57, 01, 01, 0c, 02, 02, 0e, 00, 10, 05, 01, 0e, 00, 10, 09, 01, 0e, 00, 10, 0b, 02, 01, 00, 02]
+Raw bytes (37): 0x[01, 01, 04, 01, 07, 05, 09, 0f, 02, 09, 05, 05, 01, 4f, 01, 01, 0c, 02, 02, 0e, 00, 10, 05, 01, 0e, 00, 10, 09, 01, 0e, 00, 10, 0b, 02, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 4
@@ -236,7 +237,7 @@ Number of expressions: 4
 - expression 2 operands: lhs = Expression(3, Add), rhs = Expression(0, Sub)
 - expression 3 operands: lhs = Counter(2), rhs = Counter(1)
 Number of file 0 mappings: 5
-- Code(Counter(0)) at (prev + 87, 1) to (start + 1, 12)
+- Code(Counter(0)) at (prev + 79, 1) to (start + 1, 12)
 - Code(Expression(0, Sub)) at (prev + 2, 14) to (start + 0, 16)
     = (c0 - (c1 + c2))
 - Code(Counter(1)) at (prev + 1, 14) to (start + 0, 16)
@@ -245,26 +246,26 @@ Number of file 0 mappings: 5
     = ((c2 + c1) + (c0 - (c1 + c2)))
 
 Function name: async::m
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 5f, 01, 00, 19]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 57, 01, 00, 19]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 95, 1) to (start + 0, 25)
+- Code(Counter(0)) at (prev + 87, 1) to (start + 0, 25)
 
 Function name: async::m::{closure#0} (unused)
-Raw bytes (9): 0x[01, 01, 00, 01, 00, 5f, 19, 00, 22]
+Raw bytes (9): 0x[01, 01, 00, 01, 00, 57, 19, 00, 22]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 1
-- Code(Zero) at (prev + 95, 25) to (start + 0, 34)
+- Code(Zero) at (prev + 87, 25) to (start + 0, 34)
 
 Function name: async::main
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 61, 01, 08, 02]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 59, 01, 08, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 97, 1) to (start + 8, 2)
+- Code(Counter(0)) at (prev + 89, 1) to (start + 8, 2)
 
diff --git a/tests/coverage/async.coverage b/tests/coverage/async.coverage
index e943911d31040..f5473829b028e 100644
--- a/tests/coverage/async.coverage
+++ b/tests/coverage/async.coverage
@@ -53,25 +53,15 @@
    LL|      1|}
    LL|       |
    LL|      1|fn j(x: u8) {
-   LL|      1|    // non-async versions of `c()`, `d()`, and `f()` to make it similar to async `i()`.
+   LL|       |    // non-async versions of `c()`, `d()`, and `f()` to make it similar to async `i()`.
    LL|      1|    fn c(x: u8) -> u8 {
    LL|      1|        if x == 8 {
-   LL|      1|            1 // This line appears covered, but the 1-character expression span covering the `1`
-                          ^0
-   LL|      1|              // is not executed. (`llvm-cov show` displays a `^0` below the `1` ). This is because
-   LL|      1|              // `fn j()` executes the open brace for the function body, followed by the function's
-   LL|      1|              // first executable statement, `match x`. Inner function declarations are not
-   LL|      1|              // "visible" to the MIR for `j()`, so the code region counts all lines between the
-   LL|      1|              // open brace and the first statement as executed, which is, in a sense, true.
-   LL|      1|              // `llvm-cov show` overcomes this kind of situation by showing the actual counts
-   LL|      1|              // of the enclosed coverages, (that is, the `1` expression was not executed, and
-   LL|      1|              // accurately displays a `0`).
-   LL|      1|        } else {
+   LL|      0|            1
+   LL|       |        } else {
    LL|      1|            0
-   LL|      1|        }
+   LL|       |        }
    LL|      1|    }
-   LL|      1|    fn d() -> u8 { 1 } // inner function is defined in-line, but the function is not executed
-                  ^0
+   LL|      0|    fn d() -> u8 { 1 } // inner function is defined in-line, but the function is not executed
    LL|      1|    fn f() -> u8 { 1 }
    LL|      1|    match x {
    LL|      1|        y if c(x) == y + 1 => { d(); }
diff --git a/tests/coverage/async.rs b/tests/coverage/async.rs
index 5018ade0125f3..7e6ad761ecd34 100644
--- a/tests/coverage/async.rs
+++ b/tests/coverage/async.rs
@@ -54,15 +54,7 @@ fn j(x: u8) {
     // non-async versions of `c()`, `d()`, and `f()` to make it similar to async `i()`.
     fn c(x: u8) -> u8 {
         if x == 8 {
-            1 // This line appears covered, but the 1-character expression span covering the `1`
-              // is not executed. (`llvm-cov show` displays a `^0` below the `1` ). This is because
-              // `fn j()` executes the open brace for the function body, followed by the function's
-              // first executable statement, `match x`. Inner function declarations are not
-              // "visible" to the MIR for `j()`, so the code region counts all lines between the
-              // open brace and the first statement as executed, which is, in a sense, true.
-              // `llvm-cov show` overcomes this kind of situation by showing the actual counts
-              // of the enclosed coverages, (that is, the `1` expression was not executed, and
-              // accurately displays a `0`).
+            1
         } else {
             0
         }
diff --git a/tests/coverage/attr/nested.cov-map b/tests/coverage/attr/nested.cov-map
index 0f2d5542f753a..466aec8956e0e 100644
--- a/tests/coverage/attr/nested.cov-map
+++ b/tests/coverage/attr/nested.cov-map
@@ -1,18 +1,18 @@
 Function name: nested::closure_expr
-Raw bytes (14): 0x[01, 01, 00, 02, 01, 44, 01, 01, 0f, 01, 0b, 05, 01, 02]
+Raw bytes (14): 0x[01, 01, 00, 02, 01, 3f, 01, 01, 0f, 01, 0b, 05, 01, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 2
-- Code(Counter(0)) at (prev + 68, 1) to (start + 1, 15)
+- Code(Counter(0)) at (prev + 63, 1) to (start + 1, 15)
 - Code(Counter(0)) at (prev + 11, 5) to (start + 1, 2)
 
 Function name: nested::closure_tail
-Raw bytes (14): 0x[01, 01, 00, 02, 01, 53, 01, 01, 0f, 01, 11, 05, 01, 02]
+Raw bytes (14): 0x[01, 01, 00, 02, 01, 4e, 01, 01, 0f, 01, 11, 05, 01, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 2
-- Code(Counter(0)) at (prev + 83, 1) to (start + 1, 15)
+- Code(Counter(0)) at (prev + 78, 1) to (start + 1, 15)
 - Code(Counter(0)) at (prev + 17, 5) to (start + 1, 2)
 
diff --git a/tests/coverage/attr/nested.coverage b/tests/coverage/attr/nested.coverage
index bdd117b7dfaf5..2d64fe698ead9 100644
--- a/tests/coverage/attr/nested.coverage
+++ b/tests/coverage/attr/nested.coverage
@@ -4,11 +4,6 @@
    LL|       |// Demonstrates the interaction between #[coverage(off)] and various kinds of
    LL|       |// nested function.
    LL|       |
-   LL|       |// FIXME(#126625): Coverage attributes should apply recursively to nested functions.
-   LL|       |// FIXME(#126626): When an inner (non-closure) function has `#[coverage(off)]`,
-   LL|       |// its lines can still be marked with misleading execution counts from its enclosing
-   LL|       |// function.
-   LL|       |
    LL|       |#[coverage(off)]
    LL|       |fn do_stuff() {}
    LL|       |
diff --git a/tests/coverage/attr/nested.rs b/tests/coverage/attr/nested.rs
index c7ff835f44f32..8213e29b6fcd9 100644
--- a/tests/coverage/attr/nested.rs
+++ b/tests/coverage/attr/nested.rs
@@ -4,11 +4,6 @@
 // Demonstrates the interaction between #[coverage(off)] and various kinds of
 // nested function.
 
-// FIXME(#126625): Coverage attributes should apply recursively to nested functions.
-// FIXME(#126626): When an inner (non-closure) function has `#[coverage(off)]`,
-// its lines can still be marked with misleading execution counts from its enclosing
-// function.
-
 #[coverage(off)]
 fn do_stuff() {}
 
diff --git a/tests/coverage/attr/off-on-sandwich.cov-map b/tests/coverage/attr/off-on-sandwich.cov-map
index ed77d7d17e6a7..d5fbac6ebf74b 100644
--- a/tests/coverage/attr/off-on-sandwich.cov-map
+++ b/tests/coverage/attr/off-on-sandwich.cov-map
@@ -1,24 +1,27 @@
 Function name: off_on_sandwich::dense_a::dense_b
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 14, 05, 07, 06]
+Raw bytes (14): 0x[01, 01, 00, 02, 01, 0f, 05, 02, 12, 01, 07, 05, 00, 06]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
-Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 20, 5) to (start + 7, 6)
+Number of file 0 mappings: 2
+- Code(Counter(0)) at (prev + 15, 5) to (start + 2, 18)
+- Code(Counter(0)) at (prev + 7, 5) to (start + 0, 6)
 
 Function name: off_on_sandwich::sparse_a::sparse_b::sparse_c
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 26, 09, 0b, 0a]
+Raw bytes (14): 0x[01, 01, 00, 02, 01, 21, 09, 02, 17, 01, 0b, 09, 00, 0a]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
-Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 38, 9) to (start + 11, 10)
+Number of file 0 mappings: 2
+- Code(Counter(0)) at (prev + 33, 9) to (start + 2, 23)
+- Code(Counter(0)) at (prev + 11, 9) to (start + 0, 10)
 
 Function name: off_on_sandwich::sparse_a::sparse_b::sparse_c::sparse_d
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 29, 0d, 07, 0e]
+Raw bytes (14): 0x[01, 01, 00, 02, 01, 24, 0d, 02, 1b, 01, 07, 0d, 00, 0e]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
-Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 41, 13) to (start + 7, 14)
+Number of file 0 mappings: 2
+- Code(Counter(0)) at (prev + 36, 13) to (start + 2, 27)
+- Code(Counter(0)) at (prev + 7, 13) to (start + 0, 14)
 
diff --git a/tests/coverage/attr/off-on-sandwich.coverage b/tests/coverage/attr/off-on-sandwich.coverage
index 58c128b834241..675697906ee76 100644
--- a/tests/coverage/attr/off-on-sandwich.coverage
+++ b/tests/coverage/attr/off-on-sandwich.coverage
@@ -4,11 +4,6 @@
    LL|       |// Demonstrates the interaction of `#[coverage(off)]` and `#[coverage(on)]`
    LL|       |// in nested functions.
    LL|       |
-   LL|       |// FIXME(#126625): Coverage attributes should apply recursively to nested functions.
-   LL|       |// FIXME(#126626): When an inner (non-closure) function has `#[coverage(off)]`,
-   LL|       |// its lines can still be marked with misleading execution counts from its enclosing
-   LL|       |// function.
-   LL|       |
    LL|       |#[coverage(off)]
    LL|       |fn do_stuff() {}
    LL|       |
@@ -20,10 +15,10 @@
    LL|      2|    fn dense_b() {
    LL|      2|        dense_c();
    LL|      2|        dense_c();
-   LL|      2|        #[coverage(off)]
-   LL|      2|        fn dense_c() {
-   LL|      2|            do_stuff();
-   LL|      2|        }
+   LL|       |        #[coverage(off)]
+   LL|       |        fn dense_c() {
+   LL|       |            do_stuff();
+   LL|       |        }
    LL|      2|    }
    LL|       |}
    LL|       |
@@ -41,10 +36,10 @@
    LL|      8|            fn sparse_d() {
    LL|      8|                sparse_e();
    LL|      8|                sparse_e();
-   LL|      8|                #[coverage(off)]
-   LL|      8|                fn sparse_e() {
-   LL|      8|                    do_stuff();
-   LL|      8|                }
+   LL|       |                #[coverage(off)]
+   LL|       |                fn sparse_e() {
+   LL|       |                    do_stuff();
+   LL|       |                }
    LL|      8|            }
    LL|      4|        }
    LL|       |    }
diff --git a/tests/coverage/attr/off-on-sandwich.rs b/tests/coverage/attr/off-on-sandwich.rs
index 6b21b180223eb..261634e00296a 100644
--- a/tests/coverage/attr/off-on-sandwich.rs
+++ b/tests/coverage/attr/off-on-sandwich.rs
@@ -4,11 +4,6 @@
 // Demonstrates the interaction of `#[coverage(off)]` and `#[coverage(on)]`
 // in nested functions.
 
-// FIXME(#126625): Coverage attributes should apply recursively to nested functions.
-// FIXME(#126626): When an inner (non-closure) function has `#[coverage(off)]`,
-// its lines can still be marked with misleading execution counts from its enclosing
-// function.
-
 #[coverage(off)]
 fn do_stuff() {}
 
diff --git a/tests/coverage/closure_macro.cov-map b/tests/coverage/closure_macro.cov-map
index 156947f4e21c1..eb5f94d108068 100644
--- a/tests/coverage/closure_macro.cov-map
+++ b/tests/coverage/closure_macro.cov-map
@@ -7,15 +7,16 @@ Number of file 0 mappings: 1
 - Code(Counter(0)) at (prev + 29, 1) to (start + 2, 2)
 
 Function name: closure_macro::main
-Raw bytes (31): 0x[01, 01, 01, 01, 05, 05, 01, 21, 01, 01, 21, 02, 02, 09, 00, 0f, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 01, 03, 01, 00, 02]
+Raw bytes (36): 0x[01, 01, 01, 01, 05, 06, 01, 21, 01, 01, 21, 02, 02, 09, 00, 0f, 01, 00, 12, 00, 54, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 01, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 1
 - expression 0 operands: lhs = Counter(0), rhs = Counter(1)
-Number of file 0 mappings: 5
+Number of file 0 mappings: 6
 - Code(Counter(0)) at (prev + 33, 1) to (start + 1, 33)
 - Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 0, 15)
     = (c0 - c1)
+- Code(Counter(0)) at (prev + 0, 18) to (start + 0, 84)
 - Code(Counter(1)) at (prev + 0, 84) to (start + 0, 85)
 - Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 2, 11)
     = (c0 - c1)
diff --git a/tests/coverage/closure_macro_async.cov-map b/tests/coverage/closure_macro_async.cov-map
index 0f2b4e0174836..1286d663bd4de 100644
--- a/tests/coverage/closure_macro_async.cov-map
+++ b/tests/coverage/closure_macro_async.cov-map
@@ -15,15 +15,16 @@ Number of file 0 mappings: 1
 - Code(Counter(0)) at (prev + 35, 1) to (start + 0, 43)
 
 Function name: closure_macro_async::test::{closure#0}
-Raw bytes (31): 0x[01, 01, 01, 01, 05, 05, 01, 23, 2b, 01, 21, 02, 02, 09, 00, 0f, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 01, 03, 01, 00, 02]
+Raw bytes (36): 0x[01, 01, 01, 01, 05, 06, 01, 23, 2b, 01, 21, 02, 02, 09, 00, 0f, 01, 00, 12, 00, 54, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 01, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 1
 - expression 0 operands: lhs = Counter(0), rhs = Counter(1)
-Number of file 0 mappings: 5
+Number of file 0 mappings: 6
 - Code(Counter(0)) at (prev + 35, 43) to (start + 1, 33)
 - Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 0, 15)
     = (c0 - c1)
+- Code(Counter(0)) at (prev + 0, 18) to (start + 0, 84)
 - Code(Counter(1)) at (prev + 0, 84) to (start + 0, 85)
 - Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 2, 11)
     = (c0 - c1)
diff --git a/tests/coverage/holes.cov-map b/tests/coverage/holes.cov-map
new file mode 100644
index 0000000000000..9350bd9a405cc
--- /dev/null
+++ b/tests/coverage/holes.cov-map
@@ -0,0 +1,47 @@
+Function name: <holes::main::MyStruct>::_method (unused)
+Raw bytes (9): 0x[01, 01, 00, 01, 00, 25, 09, 00, 1d]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 1
+- Code(Zero) at (prev + 37, 9) to (start + 0, 29)
+
+Function name: holes::main
+Raw bytes (44): 0x[01, 01, 00, 08, 01, 08, 01, 06, 11, 01, 0f, 05, 00, 12, 01, 04, 05, 00, 12, 01, 07, 05, 00, 12, 01, 06, 05, 00, 12, 01, 06, 05, 03, 0f, 01, 0a, 05, 03, 0f, 01, 0a, 05, 01, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 8
+- Code(Counter(0)) at (prev + 8, 1) to (start + 6, 17)
+- Code(Counter(0)) at (prev + 15, 5) to (start + 0, 18)
+- Code(Counter(0)) at (prev + 4, 5) to (start + 0, 18)
+- Code(Counter(0)) at (prev + 7, 5) to (start + 0, 18)
+- Code(Counter(0)) at (prev + 6, 5) to (start + 0, 18)
+- Code(Counter(0)) at (prev + 6, 5) to (start + 3, 15)
+- Code(Counter(0)) at (prev + 10, 5) to (start + 3, 15)
+- Code(Counter(0)) at (prev + 10, 5) to (start + 1, 2)
+
+Function name: holes::main::_unused_fn (unused)
+Raw bytes (9): 0x[01, 01, 00, 01, 00, 19, 05, 00, 17]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 1
+- Code(Zero) at (prev + 25, 5) to (start + 0, 23)
+
+Function name: holes::main::{closure#0} (unused)
+Raw bytes (9): 0x[01, 01, 00, 01, 00, 12, 09, 02, 0a]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 1
+- Code(Zero) at (prev + 18, 9) to (start + 2, 10)
+
+Function name: holes::main::{closure#1} (unused)
+Raw bytes (9): 0x[01, 01, 00, 01, 00, 3d, 09, 02, 0a]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 1
+- Code(Zero) at (prev + 61, 9) to (start + 2, 10)
+
diff --git a/tests/coverage/holes.coverage b/tests/coverage/holes.coverage
new file mode 100644
index 0000000000000..6e65435f7e3fd
--- /dev/null
+++ b/tests/coverage/holes.coverage
@@ -0,0 +1,68 @@
+   LL|       |//@ edition: 2021
+   LL|       |
+   LL|       |// Nested items/closures should be treated as "holes", so that their spans are
+   LL|       |// not displayed as executable code in the enclosing function.
+   LL|       |
+   LL|       |use core::hint::black_box;
+   LL|       |
+   LL|      1|fn main() {
+   LL|      1|    black_box(());
+   LL|      1|
+   LL|      1|    // Splitting this across multiple lines makes it easier to see where the
+   LL|      1|    // coverage mapping regions begin and end.
+   LL|      1|    #[rustfmt::skip]
+   LL|      1|    let _closure =
+   LL|       |        |
+   LL|       |            _arg: (),
+   LL|       |        |
+   LL|      0|        {
+   LL|      0|            black_box(());
+   LL|      0|        }
+   LL|       |        ;
+   LL|       |
+   LL|      1|    black_box(());
+   LL|       |
+   LL|      0|    fn _unused_fn() {}
+   LL|       |
+   LL|      1|    black_box(());
+   LL|       |
+   LL|       |    struct MyStruct {
+   LL|       |        _x: u32,
+   LL|       |        _y: u32,
+   LL|       |    }
+   LL|       |
+   LL|      1|    black_box(());
+   LL|       |
+   LL|       |    impl MyStruct {
+   LL|      0|        fn _method(&self) {}
+   LL|       |    }
+   LL|       |
+   LL|      1|    black_box(());
+   LL|       |
+   LL|       |    macro_rules! _my_macro {
+   LL|       |        () => {};
+   LL|       |    }
+   LL|       |
+   LL|      1|    black_box(());
+   LL|      1|
+   LL|      1|    #[rustfmt::skip]
+   LL|      1|    let _const =
+   LL|       |        const
+   LL|       |        {
+   LL|       |            7 + 4
+   LL|       |        }
+   LL|       |        ;
+   LL|       |
+   LL|      1|    black_box(());
+   LL|      1|
+   LL|      1|    #[rustfmt::skip]
+   LL|      1|    let _async =
+   LL|       |        async
+   LL|      0|        {
+   LL|      0|            7 + 4
+   LL|      0|        }
+   LL|       |        ;
+   LL|       |
+   LL|      1|    black_box(());
+   LL|      1|}
+
diff --git a/tests/coverage/holes.rs b/tests/coverage/holes.rs
new file mode 100644
index 0000000000000..b3a71e759c830
--- /dev/null
+++ b/tests/coverage/holes.rs
@@ -0,0 +1,67 @@
+//@ edition: 2021
+
+// Nested items/closures should be treated as "holes", so that their spans are
+// not displayed as executable code in the enclosing function.
+
+use core::hint::black_box;
+
+fn main() {
+    black_box(());
+
+    // Splitting this across multiple lines makes it easier to see where the
+    // coverage mapping regions begin and end.
+    #[rustfmt::skip]
+    let _closure =
+        |
+            _arg: (),
+        |
+        {
+            black_box(());
+        }
+        ;
+
+    black_box(());
+
+    fn _unused_fn() {}
+
+    black_box(());
+
+    struct MyStruct {
+        _x: u32,
+        _y: u32,
+    }
+
+    black_box(());
+
+    impl MyStruct {
+        fn _method(&self) {}
+    }
+
+    black_box(());
+
+    macro_rules! _my_macro {
+        () => {};
+    }
+
+    black_box(());
+
+    #[rustfmt::skip]
+    let _const =
+        const
+        {
+            7 + 4
+        }
+        ;
+
+    black_box(());
+
+    #[rustfmt::skip]
+    let _async =
+        async
+        {
+            7 + 4
+        }
+        ;
+
+    black_box(());
+}
diff --git a/tests/coverage/mcdc_if.cov-map b/tests/coverage/mcdc/if.cov-map
similarity index 97%
rename from tests/coverage/mcdc_if.cov-map
rename to tests/coverage/mcdc/if.cov-map
index 35a265684d2f6..9a7d15f700df0 100644
--- a/tests/coverage/mcdc_if.cov-map
+++ b/tests/coverage/mcdc/if.cov-map
@@ -1,4 +1,4 @@
-Function name: mcdc_if::mcdc_check_a
+Function name: if::mcdc_check_a
 Raw bytes (64): 0x[01, 01, 04, 01, 05, 09, 02, 0d, 0f, 09, 02, 08, 01, 0f, 01, 01, 09, 28, 00, 02, 01, 08, 00, 0e, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 05, 00, 0d, 00, 0e, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 0e, 0d, 00, 0f, 02, 06, 0f, 02, 0c, 02, 06, 0b, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -23,7 +23,7 @@ Number of file 0 mappings: 8
 - Code(Expression(2, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c3 + (c2 + (c0 - c1)))
 
-Function name: mcdc_if::mcdc_check_b
+Function name: if::mcdc_check_b
 Raw bytes (64): 0x[01, 01, 04, 01, 05, 09, 02, 0d, 0f, 09, 02, 08, 01, 17, 01, 01, 09, 28, 00, 02, 01, 08, 00, 0e, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 05, 00, 0d, 00, 0e, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 0e, 0d, 00, 0f, 02, 06, 0f, 02, 0c, 02, 06, 0b, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -48,7 +48,7 @@ Number of file 0 mappings: 8
 - Code(Expression(2, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c3 + (c2 + (c0 - c1)))
 
-Function name: mcdc_if::mcdc_check_both
+Function name: if::mcdc_check_both
 Raw bytes (64): 0x[01, 01, 04, 01, 05, 09, 02, 0d, 0f, 09, 02, 08, 01, 1f, 01, 01, 09, 28, 00, 02, 01, 08, 00, 0e, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 05, 00, 0d, 00, 0e, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 0e, 0d, 00, 0f, 02, 06, 0f, 02, 0c, 02, 06, 0b, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -73,7 +73,7 @@ Number of file 0 mappings: 8
 - Code(Expression(2, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c3 + (c2 + (c0 - c1)))
 
-Function name: mcdc_if::mcdc_check_neither
+Function name: if::mcdc_check_neither
 Raw bytes (64): 0x[01, 01, 04, 01, 05, 09, 02, 0d, 0f, 09, 02, 08, 01, 07, 01, 01, 09, 28, 00, 02, 01, 08, 00, 0e, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 05, 00, 0d, 00, 0e, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 0e, 0d, 00, 0f, 02, 06, 0f, 02, 0c, 02, 06, 0b, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -98,7 +98,7 @@ Number of file 0 mappings: 8
 - Code(Expression(2, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c3 + (c2 + (c0 - c1)))
 
-Function name: mcdc_if::mcdc_check_not_tree_decision
+Function name: if::mcdc_check_not_tree_decision
 Raw bytes (87): 0x[01, 01, 08, 01, 05, 02, 09, 05, 09, 0d, 1e, 02, 09, 11, 1b, 0d, 1e, 02, 09, 0a, 01, 31, 01, 03, 0a, 28, 00, 03, 03, 08, 00, 15, 30, 05, 02, 01, 02, 03, 00, 09, 00, 0a, 02, 00, 0e, 00, 0f, 30, 09, 1e, 03, 02, 00, 00, 0e, 00, 0f, 0b, 00, 14, 00, 15, 30, 11, 0d, 02, 00, 00, 00, 14, 00, 15, 11, 00, 16, 02, 06, 1b, 02, 0c, 02, 06, 17, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -133,7 +133,7 @@ Number of file 0 mappings: 10
 - Code(Expression(5, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c4 + (c3 + ((c0 - c1) - c2)))
 
-Function name: mcdc_if::mcdc_check_tree_decision
+Function name: if::mcdc_check_tree_decision
 Raw bytes (87): 0x[01, 01, 08, 01, 05, 05, 0d, 05, 0d, 0d, 11, 09, 02, 1b, 1f, 0d, 11, 09, 02, 0a, 01, 27, 01, 03, 09, 28, 00, 03, 03, 08, 00, 15, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 05, 00, 0e, 00, 0f, 30, 0d, 0a, 02, 00, 03, 00, 0e, 00, 0f, 0a, 00, 13, 00, 14, 30, 11, 09, 03, 00, 00, 00, 13, 00, 14, 1b, 00, 16, 02, 06, 1f, 02, 0c, 02, 06, 17, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -168,7 +168,7 @@ Number of file 0 mappings: 10
 - Code(Expression(5, Add)) at (prev + 3, 1) to (start + 0, 2)
     = ((c3 + c4) + (c2 + (c0 - c1)))
 
-Function name: mcdc_if::mcdc_nested_if
+Function name: if::mcdc_nested_if
 Raw bytes (124): 0x[01, 01, 0d, 01, 05, 02, 09, 05, 09, 1b, 15, 05, 09, 1b, 15, 05, 09, 11, 15, 02, 09, 2b, 32, 0d, 2f, 11, 15, 02, 09, 0e, 01, 3b, 01, 01, 09, 28, 00, 02, 01, 08, 00, 0e, 30, 05, 02, 01, 00, 02, 00, 08, 00, 09, 02, 00, 0d, 00, 0e, 30, 09, 32, 02, 00, 00, 00, 0d, 00, 0e, 1b, 01, 09, 01, 0d, 28, 01, 02, 01, 0c, 00, 12, 30, 16, 15, 01, 02, 00, 00, 0c, 00, 0d, 16, 00, 11, 00, 12, 30, 0d, 11, 02, 00, 00, 00, 11, 00, 12, 0d, 00, 13, 02, 0a, 2f, 02, 0a, 00, 0b, 32, 01, 0c, 02, 06, 27, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
diff --git a/tests/coverage/mcdc_if.coverage b/tests/coverage/mcdc/if.coverage
similarity index 88%
rename from tests/coverage/mcdc_if.coverage
rename to tests/coverage/mcdc/if.coverage
index c2ed311a5bc2c..91fff073d0cff 100644
--- a/tests/coverage/mcdc_if.coverage
+++ b/tests/coverage/mcdc/if.coverage
@@ -2,12 +2,15 @@
    LL|       |//@ edition: 2021
    LL|       |//@ min-llvm-version: 18
    LL|       |//@ compile-flags: -Zcoverage-options=mcdc
-   LL|       |//@ llvm-cov-flags: --show-mcdc
+   LL|       |//@ llvm-cov-flags: --show-branches=count --show-mcdc
    LL|       |
    LL|      2|fn mcdc_check_neither(a: bool, b: bool) {
    LL|      2|    if a && b {
                           ^0
   ------------------
+  |  Branch (LL:8): [True: 0, False: 2]
+  |  Branch (LL:13): [True: 0, False: 0]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:14)
   |
   |  Number of Conditions: 2
@@ -34,6 +37,9 @@
    LL|      2|    if a && b {
                           ^1
   ------------------
+  |  Branch (LL:8): [True: 1, False: 1]
+  |  Branch (LL:13): [True: 1, False: 0]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:14)
   |
   |  Number of Conditions: 2
@@ -60,6 +66,9 @@
    LL|      2|fn mcdc_check_b(a: bool, b: bool) {
    LL|      2|    if a && b {
   ------------------
+  |  Branch (LL:8): [True: 2, False: 0]
+  |  Branch (LL:13): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:14)
   |
   |  Number of Conditions: 2
@@ -87,6 +96,9 @@
    LL|      3|    if a && b {
                           ^2
   ------------------
+  |  Branch (LL:8): [True: 2, False: 1]
+  |  Branch (LL:13): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:14)
   |
   |  Number of Conditions: 2
@@ -117,6 +129,10 @@
    LL|      4|    if a && (b || c) {
                            ^3   ^2
   ------------------
+  |  Branch (LL:8): [True: 3, False: 1]
+  |  Branch (LL:14): [True: 1, False: 2]
+  |  Branch (LL:19): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:21)
   |
   |  Number of Conditions: 3
@@ -150,6 +166,10 @@
    LL|      4|    if (a || b) && c {
                            ^1
   ------------------
+  |  Branch (LL:9): [True: 3, False: 1]
+  |  Branch (LL:14): [True: 1, False: 0]
+  |  Branch (LL:20): [True: 2, False: 2]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:21)
   |
   |  Number of Conditions: 3
@@ -180,6 +200,9 @@
    LL|      3|    if a || b {
                           ^0
   ------------------
+  |  Branch (LL:8): [True: 3, False: 0]
+  |  Branch (LL:13): [True: 0, False: 0]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:14)
   |
   |  Number of Conditions: 2
@@ -200,6 +223,9 @@
    LL|      3|        if b && c {
                               ^2
   ------------------
+  |  Branch (LL:12): [True: 2, False: 1]
+  |  Branch (LL:17): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:12) to (LL:18)
   |
   |  Number of Conditions: 2
diff --git a/tests/coverage/mcdc_if.rs b/tests/coverage/mcdc/if.rs
similarity index 97%
rename from tests/coverage/mcdc_if.rs
rename to tests/coverage/mcdc/if.rs
index a85843721c6ce..d8e6b61a9d59d 100644
--- a/tests/coverage/mcdc_if.rs
+++ b/tests/coverage/mcdc/if.rs
@@ -2,7 +2,7 @@
 //@ edition: 2021
 //@ min-llvm-version: 18
 //@ compile-flags: -Zcoverage-options=mcdc
-//@ llvm-cov-flags: --show-mcdc
+//@ llvm-cov-flags: --show-branches=count --show-mcdc
 
 fn mcdc_check_neither(a: bool, b: bool) {
     if a && b {
diff --git a/tests/coverage/mcdc/inlined_expressions.cov-map b/tests/coverage/mcdc/inlined_expressions.cov-map
new file mode 100644
index 0000000000000..09b7291c96493
--- /dev/null
+++ b/tests/coverage/mcdc/inlined_expressions.cov-map
@@ -0,0 +1,21 @@
+Function name: inlined_expressions::inlined_instance
+Raw bytes (52): 0x[01, 01, 03, 01, 05, 0b, 02, 09, 0d, 06, 01, 08, 01, 01, 06, 28, 00, 02, 01, 05, 00, 0b, 30, 05, 02, 01, 02, 00, 00, 05, 00, 06, 05, 00, 0a, 00, 0b, 30, 09, 0d, 02, 00, 00, 00, 0a, 00, 0b, 07, 01, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 3
+- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
+- expression 1 operands: lhs = Expression(2, Add), rhs = Expression(0, Sub)
+- expression 2 operands: lhs = Counter(2), rhs = Counter(3)
+Number of file 0 mappings: 6
+- Code(Counter(0)) at (prev + 8, 1) to (start + 1, 6)
+- MCDCDecision { bitmap_idx: 0, conditions_num: 2 } at (prev + 1, 5) to (start + 0, 11)
+- MCDCBranch { true: Counter(1), false: Expression(0, Sub), condition_id: 1, true_next_id: 2, false_next_id: 0 } at (prev + 0, 5) to (start + 0, 6)
+    true  = c1
+    false = (c0 - c1)
+- Code(Counter(1)) at (prev + 0, 10) to (start + 0, 11)
+- MCDCBranch { true: Counter(2), false: Counter(3), condition_id: 2, true_next_id: 0, false_next_id: 0 } at (prev + 0, 10) to (start + 0, 11)
+    true  = c2
+    false = c3
+- Code(Expression(1, Add)) at (prev + 1, 1) to (start + 0, 2)
+    = ((c2 + c3) + (c0 - c1))
+
diff --git a/tests/coverage/mcdc/inlined_expressions.coverage b/tests/coverage/mcdc/inlined_expressions.coverage
new file mode 100644
index 0000000000000..5b083d6218680
--- /dev/null
+++ b/tests/coverage/mcdc/inlined_expressions.coverage
@@ -0,0 +1,41 @@
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2021
+   LL|       |//@ min-llvm-version: 18
+   LL|       |//@ compile-flags: -Zcoverage-options=mcdc -Copt-level=z -Cllvm-args=--inline-threshold=0
+   LL|       |//@ llvm-cov-flags: --show-branches=count --show-mcdc
+   LL|       |
+   LL|       |#[inline(always)]
+   LL|      3|fn inlined_instance(a: bool, b: bool) -> bool {
+   LL|      3|    a && b
+                       ^2
+  ------------------
+  |  Branch (LL:5): [True: 2, False: 1]
+  |  Branch (LL:10): [True: 1, False: 1]
+  ------------------
+  |---> MC/DC Decision Region (LL:5) to (LL:11)
+  |
+  |  Number of Conditions: 2
+  |     Condition C1 --> (LL:5)
+  |     Condition C2 --> (LL:10)
+  |
+  |  Executed MC/DC Test Vectors:
+  |
+  |     C1, C2    Result
+  |  1 { F,  -  = F      }
+  |  2 { T,  F  = F      }
+  |  3 { T,  T  = T      }
+  |
+  |  C1-Pair: covered: (1,3)
+  |  C2-Pair: covered: (2,3)
+  |  MC/DC Coverage for Decision: 100.00%
+  |
+  ------------------
+   LL|      3|}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    let _ = inlined_instance(true, false);
+   LL|       |    let _ = inlined_instance(false, true);
+   LL|       |    let _ = inlined_instance(true, true);
+   LL|       |}
+
diff --git a/tests/coverage/mcdc/inlined_expressions.rs b/tests/coverage/mcdc/inlined_expressions.rs
new file mode 100644
index 0000000000000..65f7ee66f3994
--- /dev/null
+++ b/tests/coverage/mcdc/inlined_expressions.rs
@@ -0,0 +1,17 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+//@ min-llvm-version: 18
+//@ compile-flags: -Zcoverage-options=mcdc -Copt-level=z -Cllvm-args=--inline-threshold=0
+//@ llvm-cov-flags: --show-branches=count --show-mcdc
+
+#[inline(always)]
+fn inlined_instance(a: bool, b: bool) -> bool {
+    a && b
+}
+
+#[coverage(off)]
+fn main() {
+    let _ = inlined_instance(true, false);
+    let _ = inlined_instance(false, true);
+    let _ = inlined_instance(true, true);
+}
diff --git a/tests/coverage/mcdc_nested_if.cov-map b/tests/coverage/mcdc/nested_if.cov-map
similarity index 98%
rename from tests/coverage/mcdc_nested_if.cov-map
rename to tests/coverage/mcdc/nested_if.cov-map
index 2f35ffad8a98e..adeb6cbc1fb89 100644
--- a/tests/coverage/mcdc_nested_if.cov-map
+++ b/tests/coverage/mcdc/nested_if.cov-map
@@ -1,4 +1,4 @@
-Function name: mcdc_nested_if::doubly_nested_if_in_condition
+Function name: nested_if::doubly_nested_if_in_condition
 Raw bytes (168): 0x[01, 01, 0e, 01, 05, 05, 11, 05, 11, 26, 19, 05, 11, 19, 1d, 19, 1d, 1d, 22, 26, 19, 05, 11, 11, 15, 09, 02, 0d, 37, 09, 02, 14, 01, 0f, 01, 01, 09, 28, 02, 02, 01, 08, 00, 4e, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 4e, 05, 00, 10, 00, 11, 28, 01, 02, 00, 10, 00, 36, 30, 11, 26, 01, 00, 02, 00, 10, 00, 11, 30, 15, 21, 02, 00, 00, 00, 15, 00, 36, 26, 00, 18, 00, 19, 28, 00, 02, 00, 18, 00, 1e, 30, 19, 22, 01, 02, 00, 00, 18, 00, 19, 19, 00, 1d, 00, 1e, 30, 1a, 1d, 02, 00, 00, 00, 1d, 00, 1e, 1a, 00, 21, 00, 25, 1f, 00, 2f, 00, 34, 2b, 00, 39, 00, 3e, 21, 00, 48, 00, 4c, 0d, 00, 4f, 02, 06, 37, 02, 0c, 02, 06, 33, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -57,7 +57,7 @@ Number of file 0 mappings: 20
 - Code(Expression(12, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c3 + (c2 + (c0 - c1)))
 
-Function name: mcdc_nested_if::nested_if_in_condition
+Function name: nested_if::nested_if_in_condition
 Raw bytes (120): 0x[01, 01, 0b, 01, 05, 05, 11, 05, 11, 1e, 15, 05, 11, 11, 15, 1e, 15, 05, 11, 09, 02, 0d, 2b, 09, 02, 0e, 01, 07, 01, 01, 09, 28, 01, 02, 01, 08, 00, 2e, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 2e, 05, 00, 10, 00, 11, 28, 00, 02, 00, 10, 00, 16, 30, 11, 1e, 01, 00, 02, 00, 10, 00, 11, 1e, 00, 15, 00, 16, 30, 15, 1a, 02, 00, 00, 00, 15, 00, 16, 17, 00, 19, 00, 1d, 1a, 00, 27, 00, 2c, 0d, 00, 2f, 02, 06, 2b, 02, 0c, 02, 06, 27, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -102,7 +102,7 @@ Number of file 0 mappings: 14
 - Code(Expression(9, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c3 + (c2 + (c0 - c1)))
 
-Function name: mcdc_nested_if::nested_in_then_block_in_condition
+Function name: nested_if::nested_in_then_block_in_condition
 Raw bytes (176): 0x[01, 01, 12, 01, 05, 05, 11, 05, 11, 3a, 15, 05, 11, 11, 15, 33, 19, 11, 15, 19, 1d, 19, 1d, 1d, 2e, 33, 19, 11, 15, 3a, 15, 05, 11, 09, 02, 0d, 47, 09, 02, 14, 01, 22, 01, 01, 09, 28, 02, 02, 01, 08, 00, 4b, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 4b, 05, 00, 10, 00, 11, 28, 00, 02, 00, 10, 00, 16, 30, 11, 3a, 01, 00, 02, 00, 10, 00, 11, 3a, 00, 15, 00, 16, 30, 15, 36, 02, 00, 00, 00, 15, 00, 16, 33, 00, 1c, 00, 1d, 28, 01, 02, 00, 1c, 00, 22, 30, 19, 2e, 01, 02, 00, 00, 1c, 00, 1d, 19, 00, 21, 00, 22, 30, 26, 1d, 02, 00, 00, 00, 21, 00, 22, 26, 00, 25, 00, 29, 2b, 00, 33, 00, 38, 36, 00, 44, 00, 49, 0d, 00, 4c, 02, 06, 47, 02, 0c, 02, 06, 43, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -166,7 +166,7 @@ Number of file 0 mappings: 20
 - Code(Expression(16, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c3 + (c2 + (c0 - c1)))
 
-Function name: mcdc_nested_if::nested_single_condition_decision
+Function name: nested_if::nested_single_condition_decision
 Raw bytes (85): 0x[01, 01, 06, 01, 05, 05, 11, 05, 11, 09, 02, 0d, 17, 09, 02, 0b, 01, 17, 01, 04, 09, 28, 00, 02, 04, 08, 00, 29, 30, 05, 02, 01, 02, 00, 00, 08, 00, 09, 30, 0d, 09, 02, 00, 00, 00, 0d, 00, 29, 05, 00, 10, 00, 11, 20, 11, 0a, 00, 10, 00, 11, 11, 00, 14, 00, 19, 0a, 00, 23, 00, 27, 0d, 00, 2a, 02, 06, 17, 02, 0c, 02, 06, 13, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
diff --git a/tests/coverage/mcdc_nested_if.coverage b/tests/coverage/mcdc/nested_if.coverage
similarity index 88%
rename from tests/coverage/mcdc_nested_if.coverage
rename to tests/coverage/mcdc/nested_if.coverage
index 19529cd6aa432..a273a713a8ab8 100644
--- a/tests/coverage/mcdc_nested_if.coverage
+++ b/tests/coverage/mcdc/nested_if.coverage
@@ -2,12 +2,17 @@
    LL|       |//@ edition: 2021
    LL|       |//@ min-llvm-version: 18
    LL|       |//@ compile-flags: -Zcoverage-options=mcdc
-   LL|       |//@ llvm-cov-flags: --show-mcdc
+   LL|       |//@ llvm-cov-flags: --show-branches=count --show-mcdc
    LL|       |
    LL|      4|fn nested_if_in_condition(a: bool, b: bool, c: bool) {
    LL|      4|    if a && if b || c { true } else { false } {
                              ^3   ^2  ^2            ^1
   ------------------
+  |  Branch (LL:8): [True: 3, False: 1]
+  |  Branch (LL:13): [True: 2, False: 1]
+  |  Branch (LL:16): [True: 1, False: 2]
+  |  Branch (LL:21): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:46)
   |
   |  Number of Conditions: 2
@@ -53,6 +58,13 @@
    LL|      4|    if a && if b || if c && d { true } else { false } { false } else { true } {
                              ^3      ^2   ^1  ^1            ^1        ^2             ^1
   ------------------
+  |  Branch (LL:8): [True: 3, False: 1]
+  |  Branch (LL:13): [True: 1, False: 2]
+  |  Branch (LL:16): [True: 1, False: 2]
+  |  Branch (LL:21): [True: 1, False: 1]
+  |  Branch (LL:24): [True: 1, False: 1]
+  |  Branch (LL:29): [True: 1, False: 0]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:78)
   |
   |  Number of Conditions: 2
@@ -117,6 +129,10 @@
    LL|      3|    if a && if b { false } else { true } {
                              ^2  ^1             ^1
   ------------------
+  |  Branch (LL:8): [True: 2, False: 1]
+  |  Branch (LL:13): [True: 1, False: 1]
+  |  Branch (LL:16): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:41)
   |
   |  Number of Conditions: 2
@@ -145,6 +161,13 @@
    LL|      7|    if a && if b || c { if d && e { true } else { false } } else { false } {
                              ^6   ^5     ^5   ^2  ^1            ^4               ^1
   ------------------
+  |  Branch (LL:8): [True: 6, False: 1]
+  |  Branch (LL:13): [True: 1, False: 5]
+  |  Branch (LL:16): [True: 1, False: 5]
+  |  Branch (LL:21): [True: 4, False: 1]
+  |  Branch (LL:28): [True: 2, False: 3]
+  |  Branch (LL:33): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:8) to (LL:75)
   |
   |  Number of Conditions: 2
diff --git a/tests/coverage/mcdc_nested_if.rs b/tests/coverage/mcdc/nested_if.rs
similarity index 97%
rename from tests/coverage/mcdc_nested_if.rs
rename to tests/coverage/mcdc/nested_if.rs
index 3d869771f75b5..f5068b5dcc23f 100644
--- a/tests/coverage/mcdc_nested_if.rs
+++ b/tests/coverage/mcdc/nested_if.rs
@@ -2,7 +2,7 @@
 //@ edition: 2021
 //@ min-llvm-version: 18
 //@ compile-flags: -Zcoverage-options=mcdc
-//@ llvm-cov-flags: --show-mcdc
+//@ llvm-cov-flags: --show-branches=count --show-mcdc
 
 fn nested_if_in_condition(a: bool, b: bool, c: bool) {
     if a && if b || c { true } else { false } {
diff --git a/tests/coverage/mcdc_non_control_flow.cov-map b/tests/coverage/mcdc/non_control_flow.cov-map
similarity index 97%
rename from tests/coverage/mcdc_non_control_flow.cov-map
rename to tests/coverage/mcdc/non_control_flow.cov-map
index 937c36e1f16c4..f8576831e75f1 100644
--- a/tests/coverage/mcdc_non_control_flow.cov-map
+++ b/tests/coverage/mcdc/non_control_flow.cov-map
@@ -1,4 +1,4 @@
-Function name: mcdc_non_control_flow::assign_3
+Function name: non_control_flow::assign_3
 Raw bytes (89): 0x[01, 01, 09, 05, 07, 0b, 11, 09, 0d, 01, 05, 01, 05, 22, 11, 01, 05, 22, 11, 01, 05, 0a, 01, 16, 01, 00, 28, 03, 01, 09, 00, 0a, 01, 00, 0d, 00, 0e, 28, 00, 03, 00, 0d, 00, 18, 30, 05, 22, 01, 00, 02, 00, 0d, 00, 0e, 22, 00, 12, 00, 13, 30, 1e, 11, 02, 03, 00, 00, 12, 00, 13, 1e, 00, 17, 00, 18, 30, 09, 0d, 03, 00, 00, 00, 17, 00, 18, 03, 01, 05, 01, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -34,7 +34,7 @@ Number of file 0 mappings: 10
 - Code(Expression(0, Add)) at (prev + 1, 5) to (start + 1, 2)
     = (c1 + ((c2 + c3) + c4))
 
-Function name: mcdc_non_control_flow::assign_3_bis
+Function name: non_control_flow::assign_3_bis
 Raw bytes (85): 0x[01, 01, 07, 07, 11, 09, 0d, 01, 05, 05, 09, 16, 1a, 05, 09, 01, 05, 0a, 01, 1b, 01, 00, 2c, 03, 01, 09, 00, 0a, 01, 00, 0d, 00, 0e, 28, 00, 03, 00, 0d, 00, 18, 30, 05, 1a, 01, 03, 02, 00, 0d, 00, 0e, 05, 00, 12, 00, 13, 30, 09, 16, 03, 00, 02, 00, 12, 00, 13, 13, 00, 17, 00, 18, 30, 0d, 11, 02, 00, 00, 00, 17, 00, 18, 03, 01, 05, 01, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -67,7 +67,7 @@ Number of file 0 mappings: 10
 - Code(Expression(0, Add)) at (prev + 1, 5) to (start + 1, 2)
     = ((c2 + c3) + c4)
 
-Function name: mcdc_non_control_flow::assign_and
+Function name: non_control_flow::assign_and
 Raw bytes (64): 0x[01, 01, 04, 07, 0e, 09, 0d, 01, 05, 01, 05, 08, 01, 0c, 01, 00, 21, 03, 01, 09, 00, 0a, 01, 00, 0d, 00, 0e, 28, 00, 02, 00, 0d, 00, 13, 30, 05, 0e, 01, 02, 00, 00, 0d, 00, 0e, 05, 00, 12, 00, 13, 30, 09, 0d, 02, 00, 00, 00, 12, 00, 13, 03, 01, 05, 01, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -92,7 +92,7 @@ Number of file 0 mappings: 8
 - Code(Expression(0, Add)) at (prev + 1, 5) to (start + 1, 2)
     = ((c2 + c3) + (c0 - c1))
 
-Function name: mcdc_non_control_flow::assign_or
+Function name: non_control_flow::assign_or
 Raw bytes (64): 0x[01, 01, 04, 07, 0d, 05, 09, 01, 05, 01, 05, 08, 01, 11, 01, 00, 20, 03, 01, 09, 00, 0a, 01, 00, 0d, 00, 0e, 28, 00, 02, 00, 0d, 00, 13, 30, 05, 0e, 01, 00, 02, 00, 0d, 00, 0e, 0e, 00, 12, 00, 13, 30, 09, 0d, 02, 00, 00, 00, 12, 00, 13, 03, 01, 05, 01, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -118,7 +118,7 @@ Number of file 0 mappings: 8
 - Code(Expression(0, Add)) at (prev + 1, 5) to (start + 1, 2)
     = ((c1 + c2) + c3)
 
-Function name: mcdc_non_control_flow::foo
+Function name: non_control_flow::foo
 Raw bytes (9): 0x[01, 01, 00, 01, 01, 25, 01, 02, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -126,7 +126,7 @@ Number of expressions: 0
 Number of file 0 mappings: 1
 - Code(Counter(0)) at (prev + 37, 1) to (start + 2, 2)
 
-Function name: mcdc_non_control_flow::func_call
+Function name: non_control_flow::func_call
 Raw bytes (52): 0x[01, 01, 03, 01, 05, 0b, 02, 09, 0d, 06, 01, 29, 01, 01, 0a, 28, 00, 02, 01, 09, 00, 0f, 30, 05, 02, 01, 02, 00, 00, 09, 00, 0a, 05, 00, 0e, 00, 0f, 30, 09, 0d, 02, 00, 00, 00, 0e, 00, 0f, 07, 01, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
@@ -147,7 +147,7 @@ Number of file 0 mappings: 6
 - Code(Expression(1, Add)) at (prev + 1, 1) to (start + 0, 2)
     = ((c2 + c3) + (c0 - c1))
 
-Function name: mcdc_non_control_flow::right_comb_tree
+Function name: non_control_flow::right_comb_tree
 Raw bytes (139): 0x[01, 01, 13, 07, 1a, 0b, 19, 0f, 15, 13, 11, 09, 0d, 01, 05, 01, 05, 05, 19, 05, 19, 4a, 15, 05, 19, 4a, 15, 05, 19, 46, 11, 4a, 15, 05, 19, 46, 11, 4a, 15, 05, 19, 0e, 01, 20, 01, 00, 41, 03, 01, 09, 00, 0a, 01, 00, 0d, 00, 0e, 28, 00, 05, 00, 0d, 00, 2a, 30, 05, 1a, 01, 02, 00, 00, 0d, 00, 0e, 05, 00, 13, 00, 14, 30, 4a, 19, 02, 03, 00, 00, 13, 00, 14, 4a, 00, 19, 00, 1a, 30, 46, 15, 03, 04, 00, 00, 19, 00, 1a, 46, 00, 1f, 00, 20, 30, 42, 11, 04, 05, 00, 00, 1f, 00, 20, 42, 00, 24, 00, 27, 30, 09, 0d, 05, 00, 00, 00, 24, 00, 27, 03, 01, 05, 01, 02]
 Number of files: 1
 - file 0 => global file 1
diff --git a/tests/coverage/mcdc_non_control_flow.coverage b/tests/coverage/mcdc/non_control_flow.coverage
similarity index 86%
rename from tests/coverage/mcdc_non_control_flow.coverage
rename to tests/coverage/mcdc/non_control_flow.coverage
index cd733885a98b6..6ae796e8ed203 100644
--- a/tests/coverage/mcdc_non_control_flow.coverage
+++ b/tests/coverage/mcdc/non_control_flow.coverage
@@ -2,7 +2,7 @@
    LL|       |//@ edition: 2021
    LL|       |//@ min-llvm-version: 18
    LL|       |//@ compile-flags: -Zcoverage-options=mcdc
-   LL|       |//@ llvm-cov-flags: --show-mcdc
+   LL|       |//@ llvm-cov-flags: --show-branches=count --show-mcdc
    LL|       |
    LL|       |// This test ensures that boolean expressions that are not inside control flow
    LL|       |// decisions are correctly instrumented.
@@ -13,6 +13,9 @@
    LL|      3|    let x = a && b;
                                ^2
   ------------------
+  |  Branch (LL:13): [True: 2, False: 1]
+  |  Branch (LL:18): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:13) to (LL:19)
   |
   |  Number of Conditions: 2
@@ -38,6 +41,9 @@
    LL|      3|    let x = a || b;
                                ^1
   ------------------
+  |  Branch (LL:13): [True: 2, False: 1]
+  |  Branch (LL:18): [True: 0, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:13) to (LL:19)
   |
   |  Number of Conditions: 2
@@ -62,6 +68,10 @@
    LL|      4|    let x = a || b && c;
                                ^2   ^1
   ------------------
+  |  Branch (LL:13): [True: 2, False: 2]
+  |  Branch (LL:18): [True: 1, False: 1]
+  |  Branch (LL:23): [True: 1, False: 0]
+  ------------------
   |---> MC/DC Decision Region (LL:13) to (LL:24)
   |
   |  Number of Conditions: 3
@@ -89,6 +99,10 @@
    LL|      4|    let x = a && b || c;
                                ^2   ^3
   ------------------
+  |  Branch (LL:13): [True: 2, False: 2]
+  |  Branch (LL:18): [True: 1, False: 1]
+  |  Branch (LL:23): [True: 2, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:13) to (LL:24)
   |
   |  Number of Conditions: 3
@@ -116,6 +130,12 @@
    LL|      3|    let x = a && (b && (c && (d && (e))));
                                 ^2    ^1    ^1   ^1
   ------------------
+  |  Branch (LL:13): [True: 2, False: 1]
+  |  Branch (LL:19): [True: 1, False: 1]
+  |  Branch (LL:25): [True: 1, False: 0]
+  |  Branch (LL:31): [True: 1, False: 0]
+  |  Branch (LL:36): [True: 1, False: 0]
+  ------------------
   |---> MC/DC Decision Region (LL:13) to (LL:42)
   |
   |  Number of Conditions: 5
@@ -151,6 +171,9 @@
    LL|      3|    foo(a && b);
                            ^2
   ------------------
+  |  Branch (LL:9): [True: 2, False: 1]
+  |  Branch (LL:14): [True: 1, False: 1]
+  ------------------
   |---> MC/DC Decision Region (LL:9) to (LL:15)
   |
   |  Number of Conditions: 2
diff --git a/tests/coverage/mcdc_non_control_flow.rs b/tests/coverage/mcdc/non_control_flow.rs
similarity index 96%
rename from tests/coverage/mcdc_non_control_flow.rs
rename to tests/coverage/mcdc/non_control_flow.rs
index 85c0a6c6ae58a..77e64e6625b2c 100644
--- a/tests/coverage/mcdc_non_control_flow.rs
+++ b/tests/coverage/mcdc/non_control_flow.rs
@@ -2,7 +2,7 @@
 //@ edition: 2021
 //@ min-llvm-version: 18
 //@ compile-flags: -Zcoverage-options=mcdc
-//@ llvm-cov-flags: --show-mcdc
+//@ llvm-cov-flags: --show-branches=count --show-mcdc
 
 // This test ensures that boolean expressions that are not inside control flow
 // decisions are correctly instrumented.
diff --git a/tests/coverage/no_cov_crate.cov-map b/tests/coverage/no_cov_crate.cov-map
index 281efb6d00d9c..75234f6c3b7ba 100644
--- a/tests/coverage/no_cov_crate.cov-map
+++ b/tests/coverage/no_cov_crate.cov-map
@@ -31,20 +31,22 @@ Number of file 0 mappings: 1
 - Code(Counter(0)) at (prev + 77, 1) to (start + 11, 2)
 
 Function name: no_cov_crate::nested_fns::outer
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 31, 05, 0c, 06]
+Raw bytes (14): 0x[01, 01, 00, 02, 01, 31, 05, 02, 23, 01, 0c, 05, 00, 06]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
-Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 49, 5) to (start + 12, 6)
+Number of file 0 mappings: 2
+- Code(Counter(0)) at (prev + 49, 5) to (start + 2, 35)
+- Code(Counter(0)) at (prev + 12, 5) to (start + 0, 6)
 
 Function name: no_cov_crate::nested_fns::outer_both_covered
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 3f, 05, 0b, 06]
+Raw bytes (14): 0x[01, 01, 00, 02, 01, 3f, 05, 02, 17, 01, 0b, 05, 00, 06]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
-Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 63, 5) to (start + 11, 6)
+Number of file 0 mappings: 2
+- Code(Counter(0)) at (prev + 63, 5) to (start + 2, 23)
+- Code(Counter(0)) at (prev + 11, 5) to (start + 0, 6)
 
 Function name: no_cov_crate::nested_fns::outer_both_covered::inner
 Raw bytes (26): 0x[01, 01, 01, 01, 05, 04, 01, 43, 09, 01, 17, 05, 01, 18, 02, 0e, 02, 02, 14, 02, 0e, 01, 03, 09, 00, 0a]
diff --git a/tests/coverage/no_cov_crate.coverage b/tests/coverage/no_cov_crate.coverage
index 29ad1f979cf80..6a43e52652e00 100644
--- a/tests/coverage/no_cov_crate.coverage
+++ b/tests/coverage/no_cov_crate.coverage
@@ -49,21 +49,21 @@
    LL|      1|    pub fn outer(is_true: bool) {
    LL|      1|        println!("called and covered");
    LL|      1|        inner_not_covered(is_true);
-   LL|      1|
-   LL|      1|        #[coverage(off)]
-   LL|      1|        fn inner_not_covered(is_true: bool) {
-   LL|      1|            if is_true {
-   LL|      1|                println!("called but not covered");
-   LL|      1|            } else {
-   LL|      1|                println!("absolutely not covered");
-   LL|      1|            }
-   LL|      1|        }
+   LL|       |
+   LL|       |        #[coverage(off)]
+   LL|       |        fn inner_not_covered(is_true: bool) {
+   LL|       |            if is_true {
+   LL|       |                println!("called but not covered");
+   LL|       |            } else {
+   LL|       |                println!("absolutely not covered");
+   LL|       |            }
+   LL|       |        }
    LL|      1|    }
    LL|       |
    LL|      1|    pub fn outer_both_covered(is_true: bool) {
    LL|      1|        println!("called and covered");
    LL|      1|        inner(is_true);
-   LL|      1|
+   LL|       |
    LL|      1|        fn inner(is_true: bool) {
    LL|      1|            if is_true {
    LL|      1|                println!("called and covered");
diff --git a/tests/crashes/124083.rs b/tests/crashes/124083.rs
deleted file mode 100644
index e9cbf3f708614..0000000000000
--- a/tests/crashes/124083.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-//@ known-bug: #124083
-
-struct Outest(&'a ());
-
-fn make() -> Outest {}
-
-fn main() {
-    if let Outest("foo") = make() {}
-}
diff --git a/tests/crashes/124262.rs b/tests/crashes/124262.rs
deleted file mode 100644
index b9dac5eca2276..0000000000000
--- a/tests/crashes/124262.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-//@ known-bug: #124262
-//@ edition:2021
-
-struct Foo(<&[fn()] as ::core::ops::Deref>::Target);
-const _: *const Foo = 0 as _;
diff --git a/tests/crashes/125155.rs b/tests/crashes/125155.rs
deleted file mode 100644
index 165061d4b5296..0000000000000
--- a/tests/crashes/125155.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-//@ known-bug: rust-lang/rust#125155
-
-enum NestedEnum {
-    First,
-    Second,
-    Third
-}
-enum Enum {
-    Variant2(Option<*mut &'a &'b ()>)
-}
-
-
-fn foo(x: Enum) -> isize {
-    match x {
-      Enum::Variant2(NestedEnum::Third) => 4,
-    }
-}
diff --git a/tests/crashes/125888.rs b/tests/crashes/125888.rs
deleted file mode 100644
index ae8f2d6576b74..0000000000000
--- a/tests/crashes/125888.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-//@ known-bug: rust-lang/rust#125888
-enum NestedEnum {
-    First,
-    Second,
-}
-
-enum Enum {
-    Variant(*const &'a ()),
-}
-
-fn foo(x: Enum) {
-    match x {
-        Enum::Variant(NestedEnum::Second) => {}
-    }
-}
-
-fn main() {}
diff --git a/tests/crashes/125992.rs b/tests/crashes/125992.rs
deleted file mode 100644
index d78f28ce6de41..0000000000000
--- a/tests/crashes/125992.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-//@ known-bug: rust-lang/rust#125992
-//@ compile-flags:  -Zpolonius=next
-
-#![feature(inherent_associated_types)]
-
-type Function = for<'a> fn(&'a i32) -> S<'a>::P;
-
-struct S<'a>(&'a ());
-
-impl<'a> S {
-    type P = &'a i32;
-}
-
-fn ret_ref_local<'e>() -> &'e i32 {
-    let f: Function = |x| x;
-
-    let local = 0;
-    f(&local)
-}
diff --git a/tests/crashes/126648.rs b/tests/crashes/126648.rs
deleted file mode 100644
index 1cf3e44bba9bc..0000000000000
--- a/tests/crashes/126648.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-//@ known-bug: rust-lang/rust#126648
-struct Outest(*const &'a ());
-
-fn make() -> Outest {}
-
-fn main() {
-    if let Outest("foo") = make() {}
-}
diff --git a/tests/crashes/126666.rs b/tests/crashes/126666.rs
deleted file mode 100644
index 58526707c9ab4..0000000000000
--- a/tests/crashes/126666.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-//@ known-bug: rust-lang/rust#126666
-#![feature(const_mut_refs)]
-#![feature(const_refs_to_static)]
-#![feature(object_safe_for_dispatch)]
-
-struct Meh {
-    x: &'static dyn UnsafeCell,
-}
-
-const MUH: Meh = Meh {
-    x: &mut *(&READONLY as *const _ as *mut _),
-};
-
-static READONLY: i32 = 0;
-
-trait UnsafeCell<'a> {}
-
-pub fn main() {}
diff --git a/tests/crashes/127266.rs b/tests/crashes/127266.rs
deleted file mode 100644
index 2bdbe03e373a9..0000000000000
--- a/tests/crashes/127266.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-//@ known-bug: rust-lang/rust#127266
-#![feature(const_mut_refs)]
-#![feature(const_refs_to_static)]
-
-struct Meh {
-    x: &'static dyn UnsafeCell,
-}
-
-const MUH: Meh = Meh {
-    x: &mut *(READONLY as *mut _),
-};
-
-static READONLY: i32 = 0;
-
-trait UnsafeCell<'a> {}
-
-pub fn main() {}
diff --git a/tests/crashes/127304.rs b/tests/crashes/127304.rs
deleted file mode 100644
index 2975fc27f6766..0000000000000
--- a/tests/crashes/127304.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-//@ known-bug: rust-lang/rust #127304
-#![feature(adt_const_params)]
-
-trait Trait<T> {}
-impl Trait<u16> for () {}
-
-struct MyStr(str);
-impl std::marker::ConstParamTy for MyStr {}
-
-fn function_with_my_str<const S: &'static MyStr>() -> &'static MyStr {
-    S
-}
-
-impl MyStr {
-    const fn new(s: &Trait str) -> &'static MyStr {}
-}
-
-pub fn main() {
-    let f = function_with_my_str::<{ MyStr::new("hello") }>();
-}
diff --git a/tests/debuginfo/basic-types-globals-metadata.rs b/tests/debuginfo/basic-types-globals-metadata.rs
index 124be655c3523..d346b405555bc 100644
--- a/tests/debuginfo/basic-types-globals-metadata.rs
+++ b/tests/debuginfo/basic-types-globals-metadata.rs
@@ -39,6 +39,9 @@
 // gdbg-command:whatis 'basic_types_globals_metadata::U64'
 // gdbr-command:whatis basic_types_globals_metadata::U64
 // gdb-check:type = u64
+// gdbg-command:whatis 'basic_types_globals_metadata::F16'
+// gdbr-command:whatis basic_types_globals_metadata::F16
+// gdb-check:type = f16
 // gdbg-command:whatis 'basic_types_globals_metadata::F32'
 // gdbr-command:whatis basic_types_globals_metadata::F32
 // gdb-check:type = f32
@@ -51,6 +54,7 @@
 #![allow(dead_code)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 // N.B. These are `mut` only so they don't constant fold away.
 static mut B: bool = false;
@@ -65,13 +69,14 @@ static mut U8: u8 = 100;
 static mut U16: u16 = 16;
 static mut U32: u32 = 32;
 static mut U64: u64 = 64;
+static mut F16: f16 = 1.5;
 static mut F32: f32 = 2.5;
 static mut F64: f64 = 3.5;
 
 fn main() {
     _zzz(); // #break
 
-    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
+    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F16, F32, F64) };
 }
 
 fn _zzz() {()}
diff --git a/tests/debuginfo/basic-types-globals.rs b/tests/debuginfo/basic-types-globals.rs
index 319e86ad46015..0425d14fa5a34 100644
--- a/tests/debuginfo/basic-types-globals.rs
+++ b/tests/debuginfo/basic-types-globals.rs
@@ -49,17 +49,21 @@
 // gdbg-command:print 'basic_types_globals::U64'
 // gdbr-command:print U64
 // gdb-check:$12 = 64
+// gdbg-command:print 'basic_types_globals::F16'
+// gdbr-command:print F16
+// gdb-check:$13 = 1.5
 // gdbg-command:print 'basic_types_globals::F32'
 // gdbr-command:print F32
-// gdb-check:$13 = 2.5
+// gdb-check:$14 = 2.5
 // gdbg-command:print 'basic_types_globals::F64'
 // gdbr-command:print F64
-// gdb-check:$14 = 3.5
+// gdb-check:$15 = 3.5
 // gdb-command:continue
 
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 // N.B. These are `mut` only so they don't constant fold away.
 static mut B: bool = false;
@@ -74,13 +78,14 @@ static mut U8: u8 = 100;
 static mut U16: u16 = 16;
 static mut U32: u32 = 32;
 static mut U64: u64 = 64;
+static mut F16: f16 = 1.5;
 static mut F32: f32 = 2.5;
 static mut F64: f64 = 3.5;
 
 fn main() {
     _zzz(); // #break
 
-    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
+    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F16, F32, F64) };
 }
 
 fn _zzz() {()}
diff --git a/tests/debuginfo/basic-types-metadata.rs b/tests/debuginfo/basic-types-metadata.rs
index 8a25c0c452413..5f953c81a138d 100644
--- a/tests/debuginfo/basic-types-metadata.rs
+++ b/tests/debuginfo/basic-types-metadata.rs
@@ -29,6 +29,8 @@
 // gdb-check:type = u32
 // gdb-command:whatis u64
 // gdb-check:type = u64
+// gdb-command:whatis f16
+// gdb-check:type = f16
 // gdb-command:whatis f32
 // gdb-check:type = f32
 // gdb-command:whatis f64
@@ -66,6 +68,7 @@
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 fn main() {
     let unit: () = ();
@@ -81,6 +84,7 @@ fn main() {
     let u16: u16 = 16;
     let u32: u32 = 32;
     let u64: u64 = 64;
+    let f16: f16 = 1.5;
     let f32: f32 = 2.5;
     let f64: f64 = 3.5;
     let fnptr : fn() = _zzz;
diff --git a/tests/debuginfo/basic-types-mut-globals.rs b/tests/debuginfo/basic-types-mut-globals.rs
index c3e5f2534d314..c676fd737714d 100644
--- a/tests/debuginfo/basic-types-mut-globals.rs
+++ b/tests/debuginfo/basic-types-mut-globals.rs
@@ -5,7 +5,6 @@
 // its numerical value.
 
 //@ min-lldb-version: 310
-//@ ignore-gdb // Test temporarily ignored due to debuginfo tests being disabled, see PR 47155
 
 //@ compile-flags:-g
 
@@ -49,62 +48,69 @@
 // gdbg-command:print 'basic_types_mut_globals::U64'
 // gdbr-command:print U64
 // gdb-check:$12 = 64
+// gdbg-command:print 'basic_types_mut_globals::F16'
+// gdbr-command:print F16
+// gdb-check:$13 = 1.5
 // gdbg-command:print 'basic_types_mut_globals::F32'
 // gdbr-command:print F32
-// gdb-check:$13 = 2.5
+// gdb-check:$14 = 2.5
 // gdbg-command:print 'basic_types_mut_globals::F64'
 // gdbr-command:print F64
-// gdb-check:$14 = 3.5
+// gdb-check:$15 = 3.5
 // gdb-command:continue
 
 // Check new values
 // gdbg-command:print 'basic_types_mut_globals'::B
 // gdbr-command:print B
-// gdb-check:$15 = true
+// gdb-check:$16 = true
 // gdbg-command:print 'basic_types_mut_globals'::I
 // gdbr-command:print I
-// gdb-check:$16 = 2
+// gdb-check:$17 = 2
 // gdbg-command:print/d 'basic_types_mut_globals'::C
 // gdbr-command:print C
-// gdbg-check:$17 = 102
-// gdbr-check:$17 = 102 'f'
+// gdbg-check:$18 = 102
+// gdbr-check:$18 = 102 'f'
 // gdbg-command:print/d 'basic_types_mut_globals'::I8
 // gdbr-command:print/d I8
-// gdb-check:$18 = 78
+// gdb-check:$19 = 78
 // gdbg-command:print 'basic_types_mut_globals'::I16
 // gdbr-command:print I16
-// gdb-check:$19 = -26
+// gdb-check:$20 = -26
 // gdbg-command:print 'basic_types_mut_globals'::I32
 // gdbr-command:print I32
-// gdb-check:$20 = -12
+// gdb-check:$21 = -12
 // gdbg-command:print 'basic_types_mut_globals'::I64
 // gdbr-command:print I64
-// gdb-check:$21 = -54
+// gdb-check:$22 = -54
 // gdbg-command:print 'basic_types_mut_globals'::U
 // gdbr-command:print U
-// gdb-check:$22 = 5
+// gdb-check:$23 = 5
 // gdbg-command:print/d 'basic_types_mut_globals'::U8
 // gdbr-command:print/d U8
-// gdb-check:$23 = 20
+// gdb-check:$24 = 20
 // gdbg-command:print 'basic_types_mut_globals'::U16
 // gdbr-command:print U16
-// gdb-check:$24 = 32
+// gdb-check:$25 = 32
 // gdbg-command:print 'basic_types_mut_globals'::U32
 // gdbr-command:print U32
-// gdb-check:$25 = 16
+// gdb-check:$26 = 16
 // gdbg-command:print 'basic_types_mut_globals'::U64
 // gdbr-command:print U64
-// gdb-check:$26 = 128
+// gdb-check:$27 = 128
+// gdbg-command:print 'basic_types_mut_globals'::F16
+// gdbr-command:print F16
+// gdb-check:$28 = 2.25
 // gdbg-command:print 'basic_types_mut_globals'::F32
 // gdbr-command:print F32
-// gdb-check:$27 = 5.75
+// gdb-check:$29 = 5.75
 // gdbg-command:print 'basic_types_mut_globals'::F64
 // gdbr-command:print F64
-// gdb-check:$28 = 9.25
+// gdb-check:$30 = 9.25
 
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 static mut B: bool = false;
 static mut I: isize = -1;
@@ -118,6 +124,7 @@ static mut U8: u8 = 100;
 static mut U16: u16 = 16;
 static mut U32: u32 = 32;
 static mut U64: u64 = 64;
+static mut F16: f16 = 1.5;
 static mut F32: f32 = 2.5;
 static mut F64: f64 = 3.5;
 
@@ -137,6 +144,7 @@ fn main() {
         U16 = 32;
         U32 = 16;
         U64 = 128;
+        F16 = 2.25;
         F32 = 5.75;
         F64 = 9.25;
     }
diff --git a/tests/debuginfo/basic-types.rs b/tests/debuginfo/basic-types.rs
index 13d85d326ee3d..10ffd74d3e909 100644
--- a/tests/debuginfo/basic-types.rs
+++ b/tests/debuginfo/basic-types.rs
@@ -39,13 +39,15 @@
 // gdb-check:$11 = 32
 // gdb-command:print u64
 // gdb-check:$12 = 64
+// gdb-command:print f16
+// gdb-check:$13 = 1.5
 // gdb-command:print f32
-// gdb-check:$13 = 2.5
+// gdb-check:$14 = 2.5
 // gdb-command:print f64
-// gdb-check:$14 = 3.5
+// gdb-check:$15 = 3.5
 // gdb-command:print s
-// gdbg-check:$15 = {data_ptr = [...] "Hello, World!", length = 13}
-// gdbr-check:$15 = "Hello, World!"
+// gdbg-check:$16 = {data_ptr = [...] "Hello, World!", length = 13}
+// gdbr-check:$16 = "Hello, World!"
 
 // === LLDB TESTS ==================================================================================
 
@@ -122,6 +124,8 @@
 // cdb-check:u32              : 0x20 [Type: unsigned int]
 // cdb-command:dx u64
 // cdb-check:u64              : 0x40 [Type: unsigned __int64]
+// cdb-command:dx f16
+// cdb-check:f16              : 1.500000 [Type: f16]
 // cdb-command:dx f32
 // cdb-check:f32              : 2.500000 [Type: float]
 // cdb-command:dx f64
@@ -134,6 +138,7 @@
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 fn main() {
     let b: bool = false;
@@ -148,6 +153,7 @@ fn main() {
     let u16: u16 = 16;
     let u32: u32 = 32;
     let u64: u64 = 64;
+    let f16: f16 = 1.5;
     let f32: f32 = 2.5;
     let f64: f64 = 3.5;
     let s: &str = "Hello, World!";
diff --git a/tests/debuginfo/borrowed-basic.rs b/tests/debuginfo/borrowed-basic.rs
index e48e3dd055e43..e3cf74dab1e75 100644
--- a/tests/debuginfo/borrowed-basic.rs
+++ b/tests/debuginfo/borrowed-basic.rs
@@ -42,11 +42,14 @@
 // gdb-command:print *u64_ref
 // gdb-check:$12 = 64
 
+// gdb-command:print *f16_ref
+// gdb-check:$13 = 1.5
+
 // gdb-command:print *f32_ref
-// gdb-check:$13 = 2.5
+// gdb-check:$14 = 2.5
 
 // gdb-command:print *f64_ref
-// gdb-check:$14 = 3.5
+// gdb-check:$15 = 3.5
 
 
 // === LLDB TESTS ==================================================================================
@@ -100,6 +103,10 @@
 // lldbg-check:[...] 64
 // lldbr-check:(u64) *u64_ref = 64
 
+// lldb-command:v *f16_ref
+// lldbg-check:[...] 1.5
+// lldbr-check:(f16) *f16_ref = 1.5
+
 // lldb-command:v *f32_ref
 // lldbg-check:[...] 2.5
 // lldbr-check:(f32) *f32_ref = 2.5
@@ -111,6 +118,7 @@
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 fn main() {
     let bool_val: bool = true;
@@ -149,6 +157,9 @@ fn main() {
     let u64_val: u64 = 64;
     let u64_ref: &u64 = &u64_val;
 
+    let f16_val: f16 = 1.5;
+    let f16_ref: &f16 = &f16_val;
+
     let f32_val: f32 = 2.5;
     let f32_ref: &f32 = &f32_val;
 
diff --git a/tests/debuginfo/borrowed-unique-basic.rs b/tests/debuginfo/borrowed-unique-basic.rs
index d6948a12851a5..e952ec8cebb52 100644
--- a/tests/debuginfo/borrowed-unique-basic.rs
+++ b/tests/debuginfo/borrowed-unique-basic.rs
@@ -42,11 +42,14 @@
 // gdb-command:print *u64_ref
 // gdb-check:$12 = 64
 
+// gdb-command:print *f16_ref
+// gdb-check:$13 = 1.5
+
 // gdb-command:print *f32_ref
-// gdb-check:$13 = 2.5
+// gdb-check:$14 = 2.5
 
 // gdb-command:print *f64_ref
-// gdb-check:$14 = 3.5
+// gdb-check:$15 = 3.5
 
 
 // === LLDB TESTS ==================================================================================
@@ -103,6 +106,10 @@
 // lldbg-check:[...] 64
 // lldbr-check:(u64) *u64_ref = 64
 
+// lldb-command:v *f16_ref
+// lldbg-check:[...] 1.5
+// lldbr-check:(f16) *f16_ref = 1.5
+
 // lldb-command:v *f32_ref
 // lldbg-check:[...] 2.5
 // lldbr-check:(f32) *f32_ref = 2.5
@@ -114,6 +121,7 @@
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 fn main() {
     let bool_box: Box<bool> = Box::new(true);
@@ -152,6 +160,9 @@ fn main() {
     let u64_box: Box<u64> = Box::new(64);
     let u64_ref: &u64 = &*u64_box;
 
+    let f16_box: Box<f16> = Box::new(1.5);
+    let f16_ref: &f16 = &*f16_box;
+
     let f32_box: Box<f32> = Box::new(2.5);
     let f32_ref: &f32 = &*f32_box;
 
diff --git a/tests/debuginfo/f16-natvis.rs b/tests/debuginfo/f16-natvis.rs
new file mode 100644
index 0000000000000..9b9749f2bad46
--- /dev/null
+++ b/tests/debuginfo/f16-natvis.rs
@@ -0,0 +1,58 @@
+//@ compile-flags: -g
+//@ only-msvc
+
+// This tests the `f16` Natvis visualiser.
+// cdb-command:g
+// cdb-command:dx v0_0
+// cdb-check:v0_0             : 0.000000 [Type: f16]
+// cdb-command:dx neg_0_0
+// cdb-check:neg_0_0          : -0.000000 [Type: f16]
+// cdb-command:dx v1_0
+// cdb-check:v1_0             : 1.000000 [Type: f16]
+// cdb-command:dx v1_5
+// cdb-check:v1_5             : 1.500000 [Type: f16]
+// cdb-command:dx v72_3
+// cdb-check:v72_3            : 72.312500 [Type: f16]
+// cdb-command:dx neg_0_126
+// cdb-check:neg_0_126        : -0.125977 [Type: f16]
+// cdb-command:dx v0_00003
+// cdb-check:v0_00003         : 0.000030 [Type: f16]
+// cdb-command:dx neg_0_00004
+// cdb-check:neg_0_00004      : -0.000040 [Type: f16]
+// cdb-command:dx max
+// cdb-check:max              : 65504.000000 [Type: f16]
+// cdb-command:dx min
+// cdb-check:min              : -65504.000000 [Type: f16]
+// cdb-command:dx inf
+// cdb-check:inf              : inf [Type: f16]
+// cdb-command:dx neg_inf
+// cdb-check:neg_inf          : -inf [Type: f16]
+// cdb-command:dx nan
+// cdb-check:nan              : NaN [Type: f16]
+// cdb-command:dx other_nan
+// cdb-check:other_nan        : NaN [Type: f16]
+
+#![feature(f16)]
+
+fn main() {
+    let v0_0 = 0.0_f16;
+    let neg_0_0 = -0.0_f16;
+    let v1_0 = 1.0_f16;
+    let v1_5 = 1.5_f16;
+    let v72_3 = 72.3_f16;
+    let neg_0_126 = -0.126_f16;
+    let v0_00003 = 0.00003_f16;
+    let neg_0_00004 = -0.00004_f16;
+    let max = f16::MAX;
+    let min = f16::MIN;
+    let inf = f16::INFINITY;
+    let neg_inf = f16::NEG_INFINITY;
+    let nan = f16::NAN;
+    let other_nan = f16::from_bits(0xfc02);
+
+    _zzz(); // #break
+}
+
+fn _zzz() {
+    ()
+}
diff --git a/tests/debuginfo/reference-debuginfo.rs b/tests/debuginfo/reference-debuginfo.rs
index 339839f07cca9..e2fb964ace521 100644
--- a/tests/debuginfo/reference-debuginfo.rs
+++ b/tests/debuginfo/reference-debuginfo.rs
@@ -46,14 +46,17 @@
 // gdb-command:print *u64_ref
 // gdb-check:$12 = 64
 
+// gdb-command:print *f16_ref
+// gdb-check:$13 = 1.5
+
 // gdb-command:print *f32_ref
-// gdb-check:$13 = 2.5
+// gdb-check:$14 = 2.5
 
 // gdb-command:print *f64_ref
-// gdb-check:$14 = 3.5
+// gdb-check:$15 = 3.5
 
 // gdb-command:print *f64_double_ref
-// gdb-check:$15 = 3.5
+// gdb-check:$16 = 3.5
 
 
 // === LLDB TESTS ==================================================================================
@@ -107,6 +110,10 @@
 // lldbg-check:[...] 64
 // lldbr-check:(u64) *u64_ref = 64
 
+// lldb-command:v *f16_ref
+// lldbg-check:[...] 1.5
+// lldbr-check:(f16) *f16_ref = 1.5
+
 // lldb-command:v *f32_ref
 // lldbg-check:[...] 2.5
 // lldbr-check:(f32) *f32_ref = 2.5
@@ -122,6 +129,7 @@
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
+#![feature(f16)]
 
 fn main() {
     let bool_val: bool = true;
@@ -160,6 +168,9 @@ fn main() {
     let u64_val: u64 = 64;
     let u64_ref: &u64 = &u64_val;
 
+    let f16_val: f16 = 1.5;
+    let f16_ref: &f16 = &f16_val;
+
     let f32_val: f32 = 2.5;
     let f32_ref: &f32 = &f32_val;
 
diff --git a/tests/mir-opt/building/match/match_false_edges.full_tested_match.built.after.mir b/tests/mir-opt/building/match/match_false_edges.full_tested_match.built.after.mir
index bade0fa4b45c8..9ebfff18f4830 100644
--- a/tests/mir-opt/building/match/match_false_edges.full_tested_match.built.after.mir
+++ b/tests/mir-opt/building/match/match_false_edges.full_tested_match.built.after.mir
@@ -62,7 +62,7 @@ fn full_tested_match() -> () {
         _6 = &((_2 as Some).0: i32);
         _3 = &fake shallow _2;
         StorageLive(_7);
-        _7 = guard() -> [return: bb8, unwind: bb16];
+        _7 = guard() -> [return: bb8, unwind: bb15];
     }
 
     bb8: {
@@ -118,11 +118,7 @@ fn full_tested_match() -> () {
         unreachable;
     }
 
-    bb15: {
-        goto -> bb14;
-    }
-
-    bb16 (cleanup): {
+    bb15 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/building/match/match_false_edges.full_tested_match2.built.after.mir b/tests/mir-opt/building/match/match_false_edges.full_tested_match2.built.after.mir
index 0d78bb8b23587..4d2989ea93ece 100644
--- a/tests/mir-opt/building/match/match_false_edges.full_tested_match2.built.after.mir
+++ b/tests/mir-opt/building/match/match_false_edges.full_tested_match2.built.after.mir
@@ -68,7 +68,7 @@ fn full_tested_match2() -> () {
         _6 = &((_2 as Some).0: i32);
         _3 = &fake shallow _2;
         StorageLive(_7);
-        _7 = guard() -> [return: bb8, unwind: bb16];
+        _7 = guard() -> [return: bb8, unwind: bb15];
     }
 
     bb8: {
@@ -118,11 +118,7 @@ fn full_tested_match2() -> () {
         unreachable;
     }
 
-    bb15: {
-        goto -> bb14;
-    }
-
-    bb16 (cleanup): {
+    bb15 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/building/match/match_false_edges.main.built.after.mir b/tests/mir-opt/building/match/match_false_edges.main.built.after.mir
index ebb75ae141a33..4ed9361070662 100644
--- a/tests/mir-opt/building/match/match_false_edges.main.built.after.mir
+++ b/tests/mir-opt/building/match/match_false_edges.main.built.after.mir
@@ -38,65 +38,61 @@ fn main() -> () {
         StorageLive(_2);
         _2 = Option::<i32>::Some(const 1_i32);
         PlaceMention(_2);
-        _5 = discriminant(_2);
-        switchInt(move _5) -> [1: bb8, otherwise: bb2];
+        _4 = discriminant(_2);
+        switchInt(move _4) -> [1: bb2, otherwise: bb1];
     }
 
     bb1: {
-        FakeRead(ForMatchedPlace(None), _2);
-        unreachable;
+        falseEdge -> [real: bb14, imaginary: bb4];
     }
 
     bb2: {
-        falseEdge -> [real: bb15, imaginary: bb3];
+        falseEdge -> [real: bb9, imaginary: bb1];
     }
 
     bb3: {
-        _4 = discriminant(_2);
-        switchInt(move _4) -> [1: bb6, otherwise: bb4];
+        goto -> bb1;
     }
 
     bb4: {
+        _5 = discriminant(_2);
+        switchInt(move _5) -> [1: bb6, otherwise: bb5];
+    }
+
+    bb5: {
         StorageLive(_14);
         _14 = _2;
         _1 = const 4_i32;
         StorageDead(_14);
-        goto -> bb21;
-    }
-
-    bb5: {
-        goto -> bb1;
+        goto -> bb20;
     }
 
     bb6: {
-        falseEdge -> [real: bb16, imaginary: bb4];
+        falseEdge -> [real: bb15, imaginary: bb5];
     }
 
     bb7: {
-        goto -> bb4;
+        goto -> bb5;
     }
 
     bb8: {
-        falseEdge -> [real: bb10, imaginary: bb2];
+        FakeRead(ForMatchedPlace(None), _2);
+        unreachable;
     }
 
     bb9: {
-        goto -> bb2;
-    }
-
-    bb10: {
         StorageLive(_7);
         _7 = &((_2 as Some).0: i32);
         _3 = &fake shallow _2;
         StorageLive(_8);
-        _8 = guard() -> [return: bb11, unwind: bb24];
+        _8 = guard() -> [return: bb10, unwind: bb22];
     }
 
-    bb11: {
-        switchInt(move _8) -> [0: bb13, otherwise: bb12];
+    bb10: {
+        switchInt(move _8) -> [0: bb12, otherwise: bb11];
     }
 
-    bb12: {
+    bb11: {
         StorageDead(_8);
         FakeRead(ForMatchGuard, _3);
         FakeRead(ForGuardBinding, _7);
@@ -105,42 +101,42 @@ fn main() -> () {
         _1 = const 1_i32;
         StorageDead(_6);
         StorageDead(_7);
-        goto -> bb21;
+        goto -> bb20;
     }
 
-    bb13: {
-        goto -> bb14;
+    bb12: {
+        goto -> bb13;
     }
 
-    bb14: {
+    bb13: {
         StorageDead(_8);
         StorageDead(_7);
-        falseEdge -> [real: bb9, imaginary: bb2];
+        falseEdge -> [real: bb3, imaginary: bb1];
     }
 
-    bb15: {
+    bb14: {
         StorageLive(_9);
         _9 = _2;
         _1 = const 2_i32;
         StorageDead(_9);
-        goto -> bb21;
+        goto -> bb20;
     }
 
-    bb16: {
+    bb15: {
         StorageLive(_11);
         _11 = &((_2 as Some).0: i32);
         _3 = &fake shallow _2;
         StorageLive(_12);
         StorageLive(_13);
         _13 = (*_11);
-        _12 = guard2(move _13) -> [return: bb17, unwind: bb24];
+        _12 = guard2(move _13) -> [return: bb16, unwind: bb22];
     }
 
-    bb17: {
-        switchInt(move _12) -> [0: bb19, otherwise: bb18];
+    bb16: {
+        switchInt(move _12) -> [0: bb18, otherwise: bb17];
     }
 
-    bb18: {
+    bb17: {
         StorageDead(_13);
         StorageDead(_12);
         FakeRead(ForMatchGuard, _3);
@@ -150,21 +146,21 @@ fn main() -> () {
         _1 = const 3_i32;
         StorageDead(_10);
         StorageDead(_11);
-        goto -> bb21;
+        goto -> bb20;
     }
 
-    bb19: {
-        goto -> bb20;
+    bb18: {
+        goto -> bb19;
     }
 
-    bb20: {
+    bb19: {
         StorageDead(_13);
         StorageDead(_12);
         StorageDead(_11);
-        falseEdge -> [real: bb7, imaginary: bb4];
+        falseEdge -> [real: bb7, imaginary: bb5];
     }
 
-    bb21: {
+    bb20: {
         PlaceMention(_1);
         StorageDead(_2);
         StorageDead(_1);
@@ -172,16 +168,12 @@ fn main() -> () {
         return;
     }
 
-    bb22: {
+    bb21: {
         FakeRead(ForMatchedPlace(None), _1);
         unreachable;
     }
 
-    bb23: {
-        goto -> bb22;
-    }
-
-    bb24 (cleanup): {
+    bb22 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/building/match/simple_match.match_bool.built.after.mir b/tests/mir-opt/building/match/simple_match.match_bool.built.after.mir
index faa2456fd1007..b0ebdc37b067d 100644
--- a/tests/mir-opt/building/match/simple_match.match_bool.built.after.mir
+++ b/tests/mir-opt/building/match/simple_match.match_bool.built.after.mir
@@ -6,17 +6,16 @@ fn match_bool(_1: bool) -> usize {
 
     bb0: {
         PlaceMention(_1);
-        switchInt(_1) -> [0: bb2, otherwise: bb4];
+        switchInt(_1) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
-        FakeRead(ForMatchedPlace(None), _1);
-        unreachable;
+        _0 = const 20_usize;
+        goto -> bb6;
     }
 
     bb2: {
-        _0 = const 20_usize;
-        goto -> bb7;
+        falseEdge -> [real: bb5, imaginary: bb1];
     }
 
     bb3: {
@@ -24,19 +23,16 @@ fn match_bool(_1: bool) -> usize {
     }
 
     bb4: {
-        falseEdge -> [real: bb6, imaginary: bb2];
+        FakeRead(ForMatchedPlace(None), _1);
+        unreachable;
     }
 
     bb5: {
-        goto -> bb2;
-    }
-
-    bb6: {
         _0 = const 10_usize;
-        goto -> bb7;
+        goto -> bb6;
     }
 
-    bb7: {
+    bb6: {
         return;
     }
 }
diff --git a/tests/mir-opt/building/match/simple_match.match_enum.built.after.mir b/tests/mir-opt/building/match/simple_match.match_enum.built.after.mir
new file mode 100644
index 0000000000000..5e685f43cd612
--- /dev/null
+++ b/tests/mir-opt/building/match/simple_match.match_enum.built.after.mir
@@ -0,0 +1,56 @@
+// MIR for `match_enum` after built
+
+fn match_enum(_1: E1) -> bool {
+    debug x => _1;
+    let mut _0: bool;
+    let mut _2: isize;
+
+    bb0: {
+        PlaceMention(_1);
+        _2 = discriminant(_1);
+        switchInt(move _2) -> [0: bb2, 1: bb4, 2: bb6, otherwise: bb1];
+    }
+
+    bb1: {
+        FakeRead(ForMatchedPlace(None), _1);
+        unreachable;
+    }
+
+    bb2: {
+        goto -> bb8;
+    }
+
+    bb3: {
+        goto -> bb1;
+    }
+
+    bb4: {
+        goto -> bb8;
+    }
+
+    bb5: {
+        goto -> bb1;
+    }
+
+    bb6: {
+        _0 = const false;
+        goto -> bb10;
+    }
+
+    bb7: {
+        goto -> bb1;
+    }
+
+    bb8: {
+        falseEdge -> [real: bb9, imaginary: bb6];
+    }
+
+    bb9: {
+        _0 = const true;
+        goto -> bb10;
+    }
+
+    bb10: {
+        return;
+    }
+}
diff --git a/tests/mir-opt/building/match/simple_match.rs b/tests/mir-opt/building/match/simple_match.rs
index 61c337822c859..c8b3d90748afb 100644
--- a/tests/mir-opt/building/match/simple_match.rs
+++ b/tests/mir-opt/building/match/simple_match.rs
@@ -9,4 +9,18 @@ fn match_bool(x: bool) -> usize {
     }
 }
 
+pub enum E1 {
+    V1,
+    V2,
+    V3,
+}
+
+// EMIT_MIR simple_match.match_enum.built.after.mir
+pub fn match_enum(x: E1) -> bool {
+    match x {
+        E1::V1 | E1::V2 => true,
+        E1::V3 => false,
+    }
+}
+
 fn main() {}
diff --git a/tests/mir-opt/building/match/sort_candidates.constant_eq.SimplifyCfg-initial.after.mir b/tests/mir-opt/building/match/sort_candidates.constant_eq.SimplifyCfg-initial.after.mir
index 060cd6132e3a0..2b5dbacc2d928 100644
--- a/tests/mir-opt/building/match/sort_candidates.constant_eq.SimplifyCfg-initial.after.mir
+++ b/tests/mir-opt/building/match/sort_candidates.constant_eq.SimplifyCfg-initial.after.mir
@@ -23,52 +23,52 @@ fn constant_eq(_1: &str, _2: bool) -> u32 {
         StorageDead(_5);
         StorageDead(_4);
         PlaceMention(_3);
-        _9 = <str as PartialEq>::eq((_3.0: &str), const "a") -> [return: bb11, unwind: bb19];
+        _9 = <str as PartialEq>::eq((_3.0: &str), const "a") -> [return: bb9, unwind: bb19];
     }
 
     bb1: {
-        switchInt((_3.1: bool)) -> [0: bb2, otherwise: bb3];
+        switchInt((_3.1: bool)) -> [0: bb10, otherwise: bb11];
     }
 
     bb2: {
-        _0 = const 5_u32;
-        goto -> bb18;
+        falseEdge -> [real: bb12, imaginary: bb5];
     }
 
     bb3: {
-        falseEdge -> [real: bb17, imaginary: bb2];
+        switchInt((_3.1: bool)) -> [0: bb1, otherwise: bb4];
     }
 
     bb4: {
-        falseEdge -> [real: bb12, imaginary: bb7];
+        falseEdge -> [real: bb16, imaginary: bb1];
     }
 
     bb5: {
-        switchInt((_3.1: bool)) -> [0: bb1, otherwise: bb6];
+        _8 = <str as PartialEq>::eq((_3.0: &str), const "b") -> [return: bb8, unwind: bb19];
     }
 
     bb6: {
-        falseEdge -> [real: bb16, imaginary: bb1];
+        switchInt((_3.1: bool)) -> [0: bb1, otherwise: bb7];
     }
 
     bb7: {
-        _8 = <str as PartialEq>::eq((_3.0: &str), const "b") -> [return: bb10, unwind: bb19];
+        falseEdge -> [real: bb15, imaginary: bb3];
     }
 
     bb8: {
-        switchInt((_3.1: bool)) -> [0: bb1, otherwise: bb9];
+        switchInt(move _8) -> [0: bb1, otherwise: bb6];
     }
 
     bb9: {
-        falseEdge -> [real: bb15, imaginary: bb5];
+        switchInt(move _9) -> [0: bb5, otherwise: bb2];
     }
 
     bb10: {
-        switchInt(move _8) -> [0: bb1, otherwise: bb8];
+        _0 = const 5_u32;
+        goto -> bb18;
     }
 
     bb11: {
-        switchInt(move _9) -> [0: bb7, otherwise: bb4];
+        falseEdge -> [real: bb17, imaginary: bb10];
     }
 
     bb12: {
@@ -89,7 +89,7 @@ fn constant_eq(_1: &str, _2: bool) -> u32 {
 
     bb14: {
         StorageDead(_10);
-        falseEdge -> [real: bb5, imaginary: bb7];
+        falseEdge -> [real: bb3, imaginary: bb5];
     }
 
     bb15: {
diff --git a/tests/mir-opt/building/uniform_array_move_out.move_out_by_subslice.built.after.mir b/tests/mir-opt/building/uniform_array_move_out.move_out_by_subslice.built.after.mir
index db758368a1388..6d3b2cf291038 100644
--- a/tests/mir-opt/building/uniform_array_move_out.move_out_by_subslice.built.after.mir
+++ b/tests/mir-opt/building/uniform_array_move_out.move_out_by_subslice.built.after.mir
@@ -26,7 +26,7 @@ fn move_out_by_subslice() -> () {
         StorageLive(_2);
         _3 = SizeOf(i32);
         _4 = AlignOf(i32);
-        _5 = alloc::alloc::exchange_malloc(move _3, move _4) -> [return: bb1, unwind: bb14];
+        _5 = alloc::alloc::exchange_malloc(move _3, move _4) -> [return: bb1, unwind: bb13];
     }
 
     bb1: {
@@ -34,7 +34,7 @@ fn move_out_by_subslice() -> () {
         _6 = ShallowInitBox(move _5, i32);
         (*_6) = const 1_i32;
         _2 = move _6;
-        drop(_6) -> [return: bb2, unwind: bb13];
+        drop(_6) -> [return: bb2, unwind: bb12];
     }
 
     bb2: {
@@ -42,7 +42,7 @@ fn move_out_by_subslice() -> () {
         StorageLive(_7);
         _8 = SizeOf(i32);
         _9 = AlignOf(i32);
-        _10 = alloc::alloc::exchange_malloc(move _8, move _9) -> [return: bb3, unwind: bb13];
+        _10 = alloc::alloc::exchange_malloc(move _8, move _9) -> [return: bb3, unwind: bb12];
     }
 
     bb3: {
@@ -50,18 +50,18 @@ fn move_out_by_subslice() -> () {
         _11 = ShallowInitBox(move _10, i32);
         (*_11) = const 2_i32;
         _7 = move _11;
-        drop(_11) -> [return: bb4, unwind: bb12];
+        drop(_11) -> [return: bb4, unwind: bb11];
     }
 
     bb4: {
         StorageDead(_11);
         _1 = [move _2, move _7];
-        drop(_7) -> [return: bb5, unwind: bb13];
+        drop(_7) -> [return: bb5, unwind: bb12];
     }
 
     bb5: {
         StorageDead(_7);
-        drop(_2) -> [return: bb6, unwind: bb14];
+        drop(_2) -> [return: bb6, unwind: bb13];
     }
 
     bb6: {
@@ -71,7 +71,7 @@ fn move_out_by_subslice() -> () {
         StorageLive(_12);
         _12 = move _1[0..2];
         _0 = const ();
-        drop(_12) -> [return: bb9, unwind: bb11];
+        drop(_12) -> [return: bb8, unwind: bb10];
     }
 
     bb7: {
@@ -80,32 +80,28 @@ fn move_out_by_subslice() -> () {
     }
 
     bb8: {
-        goto -> bb7;
-    }
-
-    bb9: {
         StorageDead(_12);
-        drop(_1) -> [return: bb10, unwind: bb14];
+        drop(_1) -> [return: bb9, unwind: bb13];
     }
 
-    bb10: {
+    bb9: {
         StorageDead(_1);
         return;
     }
 
+    bb10 (cleanup): {
+        drop(_1) -> [return: bb13, unwind terminate(cleanup)];
+    }
+
     bb11 (cleanup): {
-        drop(_1) -> [return: bb14, unwind terminate(cleanup)];
+        drop(_7) -> [return: bb12, unwind terminate(cleanup)];
     }
 
     bb12 (cleanup): {
-        drop(_7) -> [return: bb13, unwind terminate(cleanup)];
+        drop(_2) -> [return: bb13, unwind terminate(cleanup)];
     }
 
     bb13 (cleanup): {
-        drop(_2) -> [return: bb14, unwind terminate(cleanup)];
-    }
-
-    bb14 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/building/uniform_array_move_out.move_out_from_end.built.after.mir b/tests/mir-opt/building/uniform_array_move_out.move_out_from_end.built.after.mir
index 84cd557715c2a..003b90a912d25 100644
--- a/tests/mir-opt/building/uniform_array_move_out.move_out_from_end.built.after.mir
+++ b/tests/mir-opt/building/uniform_array_move_out.move_out_from_end.built.after.mir
@@ -26,7 +26,7 @@ fn move_out_from_end() -> () {
         StorageLive(_2);
         _3 = SizeOf(i32);
         _4 = AlignOf(i32);
-        _5 = alloc::alloc::exchange_malloc(move _3, move _4) -> [return: bb1, unwind: bb14];
+        _5 = alloc::alloc::exchange_malloc(move _3, move _4) -> [return: bb1, unwind: bb13];
     }
 
     bb1: {
@@ -34,7 +34,7 @@ fn move_out_from_end() -> () {
         _6 = ShallowInitBox(move _5, i32);
         (*_6) = const 1_i32;
         _2 = move _6;
-        drop(_6) -> [return: bb2, unwind: bb13];
+        drop(_6) -> [return: bb2, unwind: bb12];
     }
 
     bb2: {
@@ -42,7 +42,7 @@ fn move_out_from_end() -> () {
         StorageLive(_7);
         _8 = SizeOf(i32);
         _9 = AlignOf(i32);
-        _10 = alloc::alloc::exchange_malloc(move _8, move _9) -> [return: bb3, unwind: bb13];
+        _10 = alloc::alloc::exchange_malloc(move _8, move _9) -> [return: bb3, unwind: bb12];
     }
 
     bb3: {
@@ -50,18 +50,18 @@ fn move_out_from_end() -> () {
         _11 = ShallowInitBox(move _10, i32);
         (*_11) = const 2_i32;
         _7 = move _11;
-        drop(_11) -> [return: bb4, unwind: bb12];
+        drop(_11) -> [return: bb4, unwind: bb11];
     }
 
     bb4: {
         StorageDead(_11);
         _1 = [move _2, move _7];
-        drop(_7) -> [return: bb5, unwind: bb13];
+        drop(_7) -> [return: bb5, unwind: bb12];
     }
 
     bb5: {
         StorageDead(_7);
-        drop(_2) -> [return: bb6, unwind: bb14];
+        drop(_2) -> [return: bb6, unwind: bb13];
     }
 
     bb6: {
@@ -71,7 +71,7 @@ fn move_out_from_end() -> () {
         StorageLive(_12);
         _12 = move _1[1 of 2];
         _0 = const ();
-        drop(_12) -> [return: bb9, unwind: bb11];
+        drop(_12) -> [return: bb8, unwind: bb10];
     }
 
     bb7: {
@@ -80,32 +80,28 @@ fn move_out_from_end() -> () {
     }
 
     bb8: {
-        goto -> bb7;
-    }
-
-    bb9: {
         StorageDead(_12);
-        drop(_1) -> [return: bb10, unwind: bb14];
+        drop(_1) -> [return: bb9, unwind: bb13];
     }
 
-    bb10: {
+    bb9: {
         StorageDead(_1);
         return;
     }
 
+    bb10 (cleanup): {
+        drop(_1) -> [return: bb13, unwind terminate(cleanup)];
+    }
+
     bb11 (cleanup): {
-        drop(_1) -> [return: bb14, unwind terminate(cleanup)];
+        drop(_7) -> [return: bb12, unwind terminate(cleanup)];
     }
 
     bb12 (cleanup): {
-        drop(_7) -> [return: bb13, unwind terminate(cleanup)];
+        drop(_2) -> [return: bb13, unwind terminate(cleanup)];
     }
 
     bb13 (cleanup): {
-        drop(_2) -> [return: bb14, unwind terminate(cleanup)];
-    }
-
-    bb14 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-abort.diff b/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-abort.diff
index 938b9bb14ade2..3a5762e4f3d1e 100644
--- a/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-abort.diff
+++ b/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-abort.diff
@@ -22,59 +22,55 @@
   
       bb1: {
           StorageDead(_3);
-          _7 = Len((*_2));
-          _8 = const 4_usize;
-          _9 = Ge(move _7, move _8);
--         switchInt(move _9) -> [0: bb2, otherwise: bb7];
-+         switchInt(move _9) -> [0: bb2, otherwise: bb6];
+          _4 = Len((*_2));
+          _5 = const 4_usize;
+          _6 = Ge(move _4, move _5);
+          switchInt(move _6) -> [0: bb2, otherwise: bb3];
       }
   
       bb2: {
-          _4 = Len((*_2));
-          _5 = const 3_usize;
-          _6 = Ge(move _4, move _5);
--         switchInt(move _6) -> [0: bb3, otherwise: bb4];
-+         switchInt(move _6) -> [0: bb10, otherwise: bb3];
+          _7 = Len((*_2));
+          _8 = const 3_usize;
+          _9 = Ge(move _7, move _8);
+-         switchInt(move _9) -> [0: bb7, otherwise: bb8];
++         switchInt(move _9) -> [0: bb10, otherwise: bb7];
       }
   
       bb3: {
--         _0 = const false;
--         goto -> bb14;
-+         switchInt((*_2)[0 of 3]) -> [47: bb4, otherwise: bb10];
+          switchInt((*_2)[0 of 4]) -> [47: bb4, otherwise: bb2];
       }
   
       bb4: {
--         switchInt((*_2)[0 of 3]) -> [47: bb5, otherwise: bb3];
-+         switchInt((*_2)[1 of 3]) -> [47: bb5, otherwise: bb10];
+          switchInt((*_2)[1 of 4]) -> [47: bb5, otherwise: bb2];
       }
   
       bb5: {
--         switchInt((*_2)[1 of 3]) -> [47: bb6, otherwise: bb3];
-+         switchInt((*_2)[2 of 3]) -> [47: bb11, 33: bb11, otherwise: bb10];
+          switchInt((*_2)[2 of 4]) -> [47: bb6, otherwise: bb2];
       }
   
       bb6: {
--         switchInt((*_2)[2 of 3]) -> [47: bb12, 33: bb13, otherwise: bb3];
-+         switchInt((*_2)[0 of 4]) -> [47: bb7, otherwise: bb2];
+-         switchInt((*_2)[3 of 4]) -> [47: bb11, otherwise: bb2];
++         switchInt((*_2)[3 of 4]) -> [47: bb10, otherwise: bb2];
       }
   
       bb7: {
--         switchInt((*_2)[0 of 4]) -> [47: bb8, otherwise: bb2];
-+         switchInt((*_2)[1 of 4]) -> [47: bb8, otherwise: bb2];
+-         _0 = const false;
+-         goto -> bb14;
++         switchInt((*_2)[0 of 3]) -> [47: bb8, otherwise: bb10];
       }
   
       bb8: {
--         switchInt((*_2)[1 of 4]) -> [47: bb9, otherwise: bb2];
-+         switchInt((*_2)[2 of 4]) -> [47: bb9, otherwise: bb2];
+-         switchInt((*_2)[0 of 3]) -> [47: bb9, otherwise: bb7];
++         switchInt((*_2)[1 of 3]) -> [47: bb9, otherwise: bb10];
       }
   
       bb9: {
--         switchInt((*_2)[2 of 4]) -> [47: bb10, otherwise: bb2];
-+         switchInt((*_2)[3 of 4]) -> [47: bb10, otherwise: bb2];
+-         switchInt((*_2)[1 of 3]) -> [47: bb10, otherwise: bb7];
++         switchInt((*_2)[2 of 3]) -> [47: bb11, 33: bb11, otherwise: bb10];
       }
   
       bb10: {
--         switchInt((*_2)[3 of 4]) -> [47: bb11, otherwise: bb2];
+-         switchInt((*_2)[2 of 3]) -> [47: bb12, 33: bb13, otherwise: bb7];
 -     }
 - 
 -     bb11: {
diff --git a/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-unwind.diff b/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-unwind.diff
index ce89694076b04..21b197d2f270c 100644
--- a/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-unwind.diff
+++ b/tests/mir-opt/deduplicate_blocks.is_line_doc_comment_2.DeduplicateBlocks.panic-unwind.diff
@@ -22,59 +22,55 @@
   
       bb1: {
           StorageDead(_3);
-          _7 = Len((*_2));
-          _8 = const 4_usize;
-          _9 = Ge(move _7, move _8);
--         switchInt(move _9) -> [0: bb2, otherwise: bb7];
-+         switchInt(move _9) -> [0: bb2, otherwise: bb6];
+          _4 = Len((*_2));
+          _5 = const 4_usize;
+          _6 = Ge(move _4, move _5);
+          switchInt(move _6) -> [0: bb2, otherwise: bb3];
       }
   
       bb2: {
-          _4 = Len((*_2));
-          _5 = const 3_usize;
-          _6 = Ge(move _4, move _5);
--         switchInt(move _6) -> [0: bb3, otherwise: bb4];
-+         switchInt(move _6) -> [0: bb10, otherwise: bb3];
+          _7 = Len((*_2));
+          _8 = const 3_usize;
+          _9 = Ge(move _7, move _8);
+-         switchInt(move _9) -> [0: bb7, otherwise: bb8];
++         switchInt(move _9) -> [0: bb10, otherwise: bb7];
       }
   
       bb3: {
--         _0 = const false;
--         goto -> bb14;
-+         switchInt((*_2)[0 of 3]) -> [47: bb4, otherwise: bb10];
+          switchInt((*_2)[0 of 4]) -> [47: bb4, otherwise: bb2];
       }
   
       bb4: {
--         switchInt((*_2)[0 of 3]) -> [47: bb5, otherwise: bb3];
-+         switchInt((*_2)[1 of 3]) -> [47: bb5, otherwise: bb10];
+          switchInt((*_2)[1 of 4]) -> [47: bb5, otherwise: bb2];
       }
   
       bb5: {
--         switchInt((*_2)[1 of 3]) -> [47: bb6, otherwise: bb3];
-+         switchInt((*_2)[2 of 3]) -> [47: bb11, 33: bb11, otherwise: bb10];
+          switchInt((*_2)[2 of 4]) -> [47: bb6, otherwise: bb2];
       }
   
       bb6: {
--         switchInt((*_2)[2 of 3]) -> [47: bb12, 33: bb13, otherwise: bb3];
-+         switchInt((*_2)[0 of 4]) -> [47: bb7, otherwise: bb2];
+-         switchInt((*_2)[3 of 4]) -> [47: bb11, otherwise: bb2];
++         switchInt((*_2)[3 of 4]) -> [47: bb10, otherwise: bb2];
       }
   
       bb7: {
--         switchInt((*_2)[0 of 4]) -> [47: bb8, otherwise: bb2];
-+         switchInt((*_2)[1 of 4]) -> [47: bb8, otherwise: bb2];
+-         _0 = const false;
+-         goto -> bb14;
++         switchInt((*_2)[0 of 3]) -> [47: bb8, otherwise: bb10];
       }
   
       bb8: {
--         switchInt((*_2)[1 of 4]) -> [47: bb9, otherwise: bb2];
-+         switchInt((*_2)[2 of 4]) -> [47: bb9, otherwise: bb2];
+-         switchInt((*_2)[0 of 3]) -> [47: bb9, otherwise: bb7];
++         switchInt((*_2)[1 of 3]) -> [47: bb9, otherwise: bb10];
       }
   
       bb9: {
--         switchInt((*_2)[2 of 4]) -> [47: bb10, otherwise: bb2];
-+         switchInt((*_2)[3 of 4]) -> [47: bb10, otherwise: bb2];
+-         switchInt((*_2)[1 of 3]) -> [47: bb10, otherwise: bb7];
++         switchInt((*_2)[2 of 3]) -> [47: bb11, 33: bb11, otherwise: bb10];
       }
   
       bb10: {
--         switchInt((*_2)[3 of 4]) -> [47: bb11, otherwise: bb2];
+-         switchInt((*_2)[2 of 3]) -> [47: bb12, 33: bb13, otherwise: bb7];
 -     }
 - 
 -     bb11: {
diff --git a/tests/mir-opt/issue_72181.bar.built.after.mir b/tests/mir-opt/issue_72181.bar.built.after.mir
index 3ab9152f8bb6b..b6cc7d2219569 100644
--- a/tests/mir-opt/issue_72181.bar.built.after.mir
+++ b/tests/mir-opt/issue_72181.bar.built.after.mir
@@ -19,8 +19,4 @@ fn bar(_1: [(Never, u32); 1]) -> u32 {
         FakeRead(ForMatchedPlace(None), _1);
         unreachable;
     }
-
-    bb2: {
-        goto -> bb1;
-    }
 }
diff --git a/tests/mir-opt/issue_72181.main.built.after.mir b/tests/mir-opt/issue_72181.main.built.after.mir
index fa101512d729f..89d351d5172ce 100644
--- a/tests/mir-opt/issue_72181.main.built.after.mir
+++ b/tests/mir-opt/issue_72181.main.built.after.mir
@@ -20,7 +20,7 @@ fn main() -> () {
 
     bb0: {
         StorageLive(_1);
-        _1 = std::mem::size_of::<Foo>() -> [return: bb1, unwind: bb7];
+        _1 = std::mem::size_of::<Foo>() -> [return: bb1, unwind: bb5];
     }
 
     bb1: {
@@ -40,7 +40,7 @@ fn main() -> () {
         _6 = const 0_usize;
         _7 = Len(_2);
         _8 = Lt(_6, _7);
-        assert(move _8, "index out of bounds: the length is {} but the index is {}", move _7, _6) -> [success: bb4, unwind: bb7];
+        assert(move _8, "index out of bounds: the length is {} but the index is {}", move _7, _6) -> [success: bb3, unwind: bb5];
     }
 
     bb2: {
@@ -49,10 +49,6 @@ fn main() -> () {
     }
 
     bb3: {
-        goto -> bb2;
-    }
-
-    bb4: {
         _5 = (_2[_6].0: u64);
         PlaceMention(_5);
         StorageDead(_6);
@@ -62,16 +58,12 @@ fn main() -> () {
         return;
     }
 
-    bb5: {
+    bb4: {
         FakeRead(ForMatchedPlace(None), _5);
         unreachable;
     }
 
-    bb6: {
-        goto -> bb5;
-    }
-
-    bb7 (cleanup): {
+    bb5 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/issue_72181_1.f.built.after.mir b/tests/mir-opt/issue_72181_1.f.built.after.mir
index 674a4013fe773..89da9a8011361 100644
--- a/tests/mir-opt/issue_72181_1.f.built.after.mir
+++ b/tests/mir-opt/issue_72181_1.f.built.after.mir
@@ -6,15 +6,11 @@ fn f(_1: Void) -> ! {
 
     bb0: {
         PlaceMention(_1);
-        goto -> bb1;
-    }
-
-    bb1: {
         FakeRead(ForMatchedPlace(None), _1);
         unreachable;
     }
 
-    bb2: {
+    bb1: {
         return;
     }
 }
diff --git a/tests/mir-opt/issue_91633.bar.built.after.mir b/tests/mir-opt/issue_91633.bar.built.after.mir
index 3dcdcab9dea3d..53829588a1b36 100644
--- a/tests/mir-opt/issue_91633.bar.built.after.mir
+++ b/tests/mir-opt/issue_91633.bar.built.after.mir
@@ -12,7 +12,7 @@ fn bar(_1: Box<[T]>) -> () {
         StorageLive(_2);
         StorageLive(_3);
         _3 = &(*_1);
-        _2 = <[T] as Index<usize>>::index(move _3, const 0_usize) -> [return: bb1, unwind: bb5];
+        _2 = <[T] as Index<usize>>::index(move _3, const 0_usize) -> [return: bb1, unwind: bb4];
     }
 
     bb1: {
@@ -20,7 +20,7 @@ fn bar(_1: Box<[T]>) -> () {
         PlaceMention((*_2));
         StorageDead(_2);
         _0 = const ();
-        drop(_1) -> [return: bb4, unwind: bb6];
+        drop(_1) -> [return: bb3, unwind: bb5];
     }
 
     bb2: {
@@ -29,18 +29,14 @@ fn bar(_1: Box<[T]>) -> () {
     }
 
     bb3: {
-        goto -> bb2;
-    }
-
-    bb4: {
         return;
     }
 
-    bb5 (cleanup): {
-        drop(_1) -> [return: bb6, unwind terminate(cleanup)];
+    bb4 (cleanup): {
+        drop(_1) -> [return: bb5, unwind terminate(cleanup)];
     }
 
-    bb6 (cleanup): {
+    bb5 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/issue_91633.hey.built.after.mir b/tests/mir-opt/issue_91633.hey.built.after.mir
index e782f4d1a23fa..a537e509996d7 100644
--- a/tests/mir-opt/issue_91633.hey.built.after.mir
+++ b/tests/mir-opt/issue_91633.hey.built.after.mir
@@ -14,7 +14,7 @@ fn hey(_1: &[T]) -> () {
         StorageLive(_3);
         StorageLive(_4);
         _4 = &(*_1);
-        _3 = <[T] as Index<usize>>::index(move _4, const 0_usize) -> [return: bb1, unwind: bb4];
+        _3 = <[T] as Index<usize>>::index(move _4, const 0_usize) -> [return: bb1, unwind: bb3];
     }
 
     bb1: {
@@ -32,11 +32,7 @@ fn hey(_1: &[T]) -> () {
         unreachable;
     }
 
-    bb3: {
-        goto -> bb2;
-    }
-
-    bb4 (cleanup): {
+    bb3 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/issue_99325.main.built.after.32bit.mir b/tests/mir-opt/issue_99325.main.built.after.32bit.mir
index b7a054b5d5409..72e7f4794f980 100644
--- a/tests/mir-opt/issue_99325.main.built.after.32bit.mir
+++ b/tests/mir-opt/issue_99325.main.built.after.32bit.mir
@@ -67,7 +67,7 @@ fn main() -> () {
         StorageLive(_2);
         StorageLive(_3);
         StorageLive(_4);
-        _4 = function_with_bytes::<&*b"AAAA">() -> [return: bb1, unwind: bb25];
+        _4 = function_with_bytes::<&*b"AAAA">() -> [return: bb1, unwind: bb23];
     }
 
     bb1: {
@@ -91,7 +91,7 @@ fn main() -> () {
         _11 = &(*_8);
         StorageLive(_12);
         _12 = &(*_9);
-        _10 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _11, move _12) -> [return: bb4, unwind: bb25];
+        _10 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _11, move _12) -> [return: bb3, unwind: bb23];
     }
 
     bb2: {
@@ -100,24 +100,20 @@ fn main() -> () {
     }
 
     bb3: {
-        goto -> bb2;
+        switchInt(move _10) -> [0: bb5, otherwise: bb4];
     }
 
     bb4: {
-        switchInt(move _10) -> [0: bb6, otherwise: bb5];
-    }
-
-    bb5: {
         StorageDead(_12);
         StorageDead(_11);
-        goto -> bb10;
+        goto -> bb9;
     }
 
-    bb6: {
-        goto -> bb7;
+    bb5: {
+        goto -> bb6;
     }
 
-    bb7: {
+    bb6: {
         StorageDead(_12);
         StorageDead(_11);
         StorageLive(_14);
@@ -136,10 +132,10 @@ fn main() -> () {
         _19 = &(*_20);
         StorageLive(_21);
         _21 = Option::<Arguments<'_>>::None;
-        _15 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _16, move _17, move _19, move _21) -> bb25;
+        _15 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _16, move _17, move _19, move _21) -> bb23;
     }
 
-    bb8: {
+    bb7: {
         StorageDead(_21);
         StorageDead(_19);
         StorageDead(_17);
@@ -151,23 +147,23 @@ fn main() -> () {
         unreachable;
     }
 
-    bb9: {
-        goto -> bb11;
+    bb8: {
+        goto -> bb10;
     }
 
-    bb10: {
+    bb9: {
         _1 = const ();
-        goto -> bb11;
+        goto -> bb10;
     }
 
-    bb11: {
+    bb10: {
         StorageDead(_10);
         StorageDead(_9);
         StorageDead(_8);
-        goto -> bb12;
+        goto -> bb11;
     }
 
-    bb12: {
+    bb11: {
         StorageDead(_7);
         StorageDead(_6);
         StorageDead(_4);
@@ -177,10 +173,10 @@ fn main() -> () {
         StorageLive(_23);
         StorageLive(_24);
         StorageLive(_25);
-        _25 = function_with_bytes::<&*b"AAAA">() -> [return: bb13, unwind: bb25];
+        _25 = function_with_bytes::<&*b"AAAA">() -> [return: bb12, unwind: bb23];
     }
 
-    bb13: {
+    bb12: {
         _24 = &_25;
         StorageLive(_26);
         StorageLive(_27);
@@ -199,33 +195,29 @@ fn main() -> () {
         _31 = &(*_28);
         StorageLive(_32);
         _32 = &(*_29);
-        _30 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _31, move _32) -> [return: bb16, unwind: bb25];
+        _30 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _31, move _32) -> [return: bb14, unwind: bb23];
     }
 
-    bb14: {
+    bb13: {
         FakeRead(ForMatchedPlace(None), _23);
         unreachable;
     }
 
-    bb15: {
-        goto -> bb14;
-    }
-
-    bb16: {
-        switchInt(move _30) -> [0: bb18, otherwise: bb17];
+    bb14: {
+        switchInt(move _30) -> [0: bb16, otherwise: bb15];
     }
 
-    bb17: {
+    bb15: {
         StorageDead(_32);
         StorageDead(_31);
-        goto -> bb22;
+        goto -> bb20;
     }
 
-    bb18: {
-        goto -> bb19;
+    bb16: {
+        goto -> bb17;
     }
 
-    bb19: {
+    bb17: {
         StorageDead(_32);
         StorageDead(_31);
         StorageLive(_34);
@@ -244,10 +236,10 @@ fn main() -> () {
         _39 = &(*_40);
         StorageLive(_41);
         _41 = Option::<Arguments<'_>>::None;
-        _35 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _36, move _37, move _39, move _41) -> bb25;
+        _35 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _36, move _37, move _39, move _41) -> bb23;
     }
 
-    bb20: {
+    bb18: {
         StorageDead(_41);
         StorageDead(_39);
         StorageDead(_37);
@@ -259,23 +251,23 @@ fn main() -> () {
         unreachable;
     }
 
-    bb21: {
-        goto -> bb23;
+    bb19: {
+        goto -> bb21;
     }
 
-    bb22: {
+    bb20: {
         _22 = const ();
-        goto -> bb23;
+        goto -> bb21;
     }
 
-    bb23: {
+    bb21: {
         StorageDead(_30);
         StorageDead(_29);
         StorageDead(_28);
-        goto -> bb24;
+        goto -> bb22;
     }
 
-    bb24: {
+    bb22: {
         StorageDead(_27);
         StorageDead(_25);
         StorageDead(_23);
@@ -284,7 +276,7 @@ fn main() -> () {
         return;
     }
 
-    bb25 (cleanup): {
+    bb23 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/issue_99325.main.built.after.64bit.mir b/tests/mir-opt/issue_99325.main.built.after.64bit.mir
index b7a054b5d5409..72e7f4794f980 100644
--- a/tests/mir-opt/issue_99325.main.built.after.64bit.mir
+++ b/tests/mir-opt/issue_99325.main.built.after.64bit.mir
@@ -67,7 +67,7 @@ fn main() -> () {
         StorageLive(_2);
         StorageLive(_3);
         StorageLive(_4);
-        _4 = function_with_bytes::<&*b"AAAA">() -> [return: bb1, unwind: bb25];
+        _4 = function_with_bytes::<&*b"AAAA">() -> [return: bb1, unwind: bb23];
     }
 
     bb1: {
@@ -91,7 +91,7 @@ fn main() -> () {
         _11 = &(*_8);
         StorageLive(_12);
         _12 = &(*_9);
-        _10 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _11, move _12) -> [return: bb4, unwind: bb25];
+        _10 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _11, move _12) -> [return: bb3, unwind: bb23];
     }
 
     bb2: {
@@ -100,24 +100,20 @@ fn main() -> () {
     }
 
     bb3: {
-        goto -> bb2;
+        switchInt(move _10) -> [0: bb5, otherwise: bb4];
     }
 
     bb4: {
-        switchInt(move _10) -> [0: bb6, otherwise: bb5];
-    }
-
-    bb5: {
         StorageDead(_12);
         StorageDead(_11);
-        goto -> bb10;
+        goto -> bb9;
     }
 
-    bb6: {
-        goto -> bb7;
+    bb5: {
+        goto -> bb6;
     }
 
-    bb7: {
+    bb6: {
         StorageDead(_12);
         StorageDead(_11);
         StorageLive(_14);
@@ -136,10 +132,10 @@ fn main() -> () {
         _19 = &(*_20);
         StorageLive(_21);
         _21 = Option::<Arguments<'_>>::None;
-        _15 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _16, move _17, move _19, move _21) -> bb25;
+        _15 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _16, move _17, move _19, move _21) -> bb23;
     }
 
-    bb8: {
+    bb7: {
         StorageDead(_21);
         StorageDead(_19);
         StorageDead(_17);
@@ -151,23 +147,23 @@ fn main() -> () {
         unreachable;
     }
 
-    bb9: {
-        goto -> bb11;
+    bb8: {
+        goto -> bb10;
     }
 
-    bb10: {
+    bb9: {
         _1 = const ();
-        goto -> bb11;
+        goto -> bb10;
     }
 
-    bb11: {
+    bb10: {
         StorageDead(_10);
         StorageDead(_9);
         StorageDead(_8);
-        goto -> bb12;
+        goto -> bb11;
     }
 
-    bb12: {
+    bb11: {
         StorageDead(_7);
         StorageDead(_6);
         StorageDead(_4);
@@ -177,10 +173,10 @@ fn main() -> () {
         StorageLive(_23);
         StorageLive(_24);
         StorageLive(_25);
-        _25 = function_with_bytes::<&*b"AAAA">() -> [return: bb13, unwind: bb25];
+        _25 = function_with_bytes::<&*b"AAAA">() -> [return: bb12, unwind: bb23];
     }
 
-    bb13: {
+    bb12: {
         _24 = &_25;
         StorageLive(_26);
         StorageLive(_27);
@@ -199,33 +195,29 @@ fn main() -> () {
         _31 = &(*_28);
         StorageLive(_32);
         _32 = &(*_29);
-        _30 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _31, move _32) -> [return: bb16, unwind: bb25];
+        _30 = <&[u8] as PartialEq<&[u8; 4]>>::eq(move _31, move _32) -> [return: bb14, unwind: bb23];
     }
 
-    bb14: {
+    bb13: {
         FakeRead(ForMatchedPlace(None), _23);
         unreachable;
     }
 
-    bb15: {
-        goto -> bb14;
-    }
-
-    bb16: {
-        switchInt(move _30) -> [0: bb18, otherwise: bb17];
+    bb14: {
+        switchInt(move _30) -> [0: bb16, otherwise: bb15];
     }
 
-    bb17: {
+    bb15: {
         StorageDead(_32);
         StorageDead(_31);
-        goto -> bb22;
+        goto -> bb20;
     }
 
-    bb18: {
-        goto -> bb19;
+    bb16: {
+        goto -> bb17;
     }
 
-    bb19: {
+    bb17: {
         StorageDead(_32);
         StorageDead(_31);
         StorageLive(_34);
@@ -244,10 +236,10 @@ fn main() -> () {
         _39 = &(*_40);
         StorageLive(_41);
         _41 = Option::<Arguments<'_>>::None;
-        _35 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _36, move _37, move _39, move _41) -> bb25;
+        _35 = core::panicking::assert_failed::<&[u8], &[u8; 4]>(move _36, move _37, move _39, move _41) -> bb23;
     }
 
-    bb20: {
+    bb18: {
         StorageDead(_41);
         StorageDead(_39);
         StorageDead(_37);
@@ -259,23 +251,23 @@ fn main() -> () {
         unreachable;
     }
 
-    bb21: {
-        goto -> bb23;
+    bb19: {
+        goto -> bb21;
     }
 
-    bb22: {
+    bb20: {
         _22 = const ();
-        goto -> bb23;
+        goto -> bb21;
     }
 
-    bb23: {
+    bb21: {
         StorageDead(_30);
         StorageDead(_29);
         StorageDead(_28);
-        goto -> bb24;
+        goto -> bb22;
     }
 
-    bb24: {
+    bb22: {
         StorageDead(_27);
         StorageDead(_25);
         StorageDead(_23);
@@ -284,7 +276,7 @@ fn main() -> () {
         return;
     }
 
-    bb25 (cleanup): {
+    bb23 (cleanup): {
         resume;
     }
 }
diff --git a/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff b/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff
index 209f0d09c2943..4f29e5244d7c2 100644
--- a/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff
+++ b/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff
@@ -32,25 +32,33 @@
   
       bb0: {
           PlaceMention(_2);
--         switchInt((_2.0: bool)) -> [0: bb6, otherwise: bb1];
+-         switchInt((_2.0: bool)) -> [0: bb2, otherwise: bb1];
 +         switchInt((_2.0: bool)) -> [0: bb5, otherwise: bb1];
       }
   
       bb1: {
--         switchInt((_2.1: bool)) -> [0: bb5, otherwise: bb2];
+-         switchInt((_2.1: bool)) -> [0: bb4, otherwise: bb3];
 +         switchInt((_2.1: bool)) -> [0: bb10, otherwise: bb2];
       }
   
       bb2: {
--         switchInt((_2.0: bool)) -> [0: bb4, otherwise: bb3];
+-         falseEdge -> [real: bb8, imaginary: bb1];
 +         switchInt((_2.0: bool)) -> [0: bb3, otherwise: bb17];
       }
   
       bb3: {
--         falseEdge -> [real: bb20, imaginary: bb4];
+-         switchInt((_2.0: bool)) -> [0: bb6, otherwise: bb5];
 -     }
 - 
 -     bb4: {
+-         falseEdge -> [real: bb13, imaginary: bb3];
+-     }
+- 
+-     bb5: {
+-         falseEdge -> [real: bb20, imaginary: bb6];
+-     }
+- 
+-     bb6: {
           StorageLive(_15);
           _15 = (_2.1: bool);
           StorageLive(_16);
@@ -59,14 +67,6 @@
 +         goto -> bb16;
       }
   
--     bb5: {
--         falseEdge -> [real: bb13, imaginary: bb2];
--     }
-- 
--     bb6: {
--         falseEdge -> [real: bb8, imaginary: bb1];
--     }
-- 
 -     bb7: {
 +     bb4: {
           _0 = const 1_i32;
@@ -184,7 +184,7 @@
           StorageDead(_12);
           StorageDead(_8);
           StorageDead(_6);
--         falseEdge -> [real: bb2, imaginary: bb2];
+-         falseEdge -> [real: bb3, imaginary: bb3];
 +         goto -> bb2;
       }
   
diff --git a/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff b/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff
index 209f0d09c2943..4f29e5244d7c2 100644
--- a/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff
+++ b/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff
@@ -32,25 +32,33 @@
   
       bb0: {
           PlaceMention(_2);
--         switchInt((_2.0: bool)) -> [0: bb6, otherwise: bb1];
+-         switchInt((_2.0: bool)) -> [0: bb2, otherwise: bb1];
 +         switchInt((_2.0: bool)) -> [0: bb5, otherwise: bb1];
       }
   
       bb1: {
--         switchInt((_2.1: bool)) -> [0: bb5, otherwise: bb2];
+-         switchInt((_2.1: bool)) -> [0: bb4, otherwise: bb3];
 +         switchInt((_2.1: bool)) -> [0: bb10, otherwise: bb2];
       }
   
       bb2: {
--         switchInt((_2.0: bool)) -> [0: bb4, otherwise: bb3];
+-         falseEdge -> [real: bb8, imaginary: bb1];
 +         switchInt((_2.0: bool)) -> [0: bb3, otherwise: bb17];
       }
   
       bb3: {
--         falseEdge -> [real: bb20, imaginary: bb4];
+-         switchInt((_2.0: bool)) -> [0: bb6, otherwise: bb5];
 -     }
 - 
 -     bb4: {
+-         falseEdge -> [real: bb13, imaginary: bb3];
+-     }
+- 
+-     bb5: {
+-         falseEdge -> [real: bb20, imaginary: bb6];
+-     }
+- 
+-     bb6: {
           StorageLive(_15);
           _15 = (_2.1: bool);
           StorageLive(_16);
@@ -59,14 +67,6 @@
 +         goto -> bb16;
       }
   
--     bb5: {
--         falseEdge -> [real: bb13, imaginary: bb2];
--     }
-- 
--     bb6: {
--         falseEdge -> [real: bb8, imaginary: bb1];
--     }
-- 
 -     bb7: {
 +     bb4: {
           _0 = const 1_i32;
@@ -184,7 +184,7 @@
           StorageDead(_12);
           StorageDead(_8);
           StorageDead(_6);
--         falseEdge -> [real: bb2, imaginary: bb2];
+-         falseEdge -> [real: bb3, imaginary: bb3];
 +         goto -> bb2;
       }
   
diff --git a/tests/mir-opt/or_pattern.shortcut_second_or.SimplifyCfg-initial.after.mir b/tests/mir-opt/or_pattern.shortcut_second_or.SimplifyCfg-initial.after.mir
index 56edd38a6da4c..e357e785e33ee 100644
--- a/tests/mir-opt/or_pattern.shortcut_second_or.SimplifyCfg-initial.after.mir
+++ b/tests/mir-opt/or_pattern.shortcut_second_or.SimplifyCfg-initial.after.mir
@@ -18,24 +18,24 @@ fn shortcut_second_or() -> () {
         _1 = (move _2, const 0_i32);
         StorageDead(_2);
         PlaceMention(_1);
-        switchInt(((_1.0: (i32, i32)).0: i32)) -> [0: bb4, otherwise: bb2];
+        switchInt(((_1.0: (i32, i32)).0: i32)) -> [0: bb2, otherwise: bb1];
     }
 
     bb1: {
-        _0 = const ();
-        goto -> bb14;
+        switchInt(((_1.0: (i32, i32)).1: i32)) -> [1: bb4, otherwise: bb3];
     }
 
     bb2: {
-        switchInt(((_1.0: (i32, i32)).1: i32)) -> [1: bb3, otherwise: bb1];
+        switchInt((_1.1: i32)) -> [2: bb5, 3: bb6, otherwise: bb3];
     }
 
     bb3: {
-        switchInt((_1.1: i32)) -> [2: bb7, 3: bb8, otherwise: bb1];
+        _0 = const ();
+        goto -> bb14;
     }
 
     bb4: {
-        switchInt((_1.1: i32)) -> [2: bb5, 3: bb6, otherwise: bb1];
+        switchInt((_1.1: i32)) -> [2: bb7, 3: bb8, otherwise: bb3];
     }
 
     bb5: {
@@ -43,7 +43,7 @@ fn shortcut_second_or() -> () {
     }
 
     bb6: {
-        falseEdge -> [real: bb11, imaginary: bb2];
+        falseEdge -> [real: bb11, imaginary: bb1];
     }
 
     bb7: {
@@ -51,7 +51,7 @@ fn shortcut_second_or() -> () {
     }
 
     bb8: {
-        falseEdge -> [real: bb13, imaginary: bb1];
+        falseEdge -> [real: bb13, imaginary: bb3];
     }
 
     bb9: {
diff --git a/tests/pretty/issue-4264.pp b/tests/pretty/issue-4264.pp
index 018ccf82daebf..fa958d9f1e8f8 100644
--- a/tests/pretty/issue-4264.pp
+++ b/tests/pretty/issue-4264.pp
@@ -29,16 +29,17 @@
 
 
 
-    ({
-        let res =
-            ((::alloc::fmt::format as
-                    for<'a> fn(Arguments<'a>) -> String {format})(((format_arguments::new_const
-                        as
-                        fn(&[&'static str; 1]) -> Arguments<'_> {Arguments::<'_>::new_const::<1>})((&([("test"
-                                    as &str)] as [&str; 1]) as &[&str; 1])) as Arguments<'_>))
-                as String);
-        (res as String)
-    } as String);
+    ((::alloc::__export::must_use as
+            fn(String) -> String {must_use::<String>})(({
+            let res =
+                ((::alloc::fmt::format as
+                        for<'a> fn(Arguments<'a>) -> String {format})(((format_arguments::new_const
+                            as
+                            fn(&[&'static str; 1]) -> Arguments<'_> {Arguments::<'_>::new_const::<1>})((&([("test"
+                                        as &str)] as [&str; 1]) as &[&str; 1])) as Arguments<'_>))
+                    as String);
+            (res as String)
+        } as String)) as String);
 } as ())
 type Foo = [i32; (3 as usize)];
 struct Bar {
diff --git a/tests/run-make/cdylib-fewer-symbols/Makefile b/tests/run-make/cdylib-fewer-symbols/Makefile
deleted file mode 100644
index d587cece5bec0..0000000000000
--- a/tests/run-make/cdylib-fewer-symbols/Makefile
+++ /dev/null
@@ -1,15 +0,0 @@
-# ignore-cross-compile
-
-# Test that allocator-related symbols don't show up as exported from a cdylib as
-# they're internal to Rust and not part of the public ABI.
-# See https://github.com/rust-lang/rust/commit/fbf98697021173a30b84d9145df0966a23a2f9d2
-
-include ../tools.mk
-
-# ignore-windows
-# FIXME: The __rdl_ and __rust_ symbol still remains, no matter using MSVC or GNU
-# See https://github.com/rust-lang/rust/pull/46207#issuecomment-347561753
-
-all:
-	$(RUSTC) foo.rs
-	nm -g "$(call DYLIB,foo)" | $(CGREP) -v __rdl_ __rde_ __rg_ __rust_
diff --git a/tests/run-make/cdylib-fewer-symbols/rmake.rs b/tests/run-make/cdylib-fewer-symbols/rmake.rs
new file mode 100644
index 0000000000000..da11f036f7ca4
--- /dev/null
+++ b/tests/run-make/cdylib-fewer-symbols/rmake.rs
@@ -0,0 +1,21 @@
+// Symbols related to the allocator should be hidden and not exported from a cdylib,
+// for they are internal to Rust
+// and not part of the public ABI (application binary interface). This test checks that
+// four such symbols are successfully hidden.
+// See https://github.com/rust-lang/rust/pull/45710
+
+//@ ignore-cross-compile
+// Reason: The __rust_ symbol appears during cross-compilation.
+
+use run_make_support::{dynamic_lib_name, llvm_readobj, rustc};
+
+fn main() {
+    // Compile a cdylib
+    rustc().input("foo.rs").run();
+    let out =
+        llvm_readobj().arg("--dyn-symbols").input(dynamic_lib_name("foo")).run().stdout_utf8();
+    assert!(!&out.contains("__rdl_"), "{out}");
+    assert!(!&out.contains("__rde_"), "{out}");
+    assert!(!&out.contains("__rg_"), "{out}");
+    assert!(!&out.contains("__rust_"), "{out}");
+}
diff --git a/tests/run-make/extern-flag-pathless/Makefile b/tests/run-make/extern-flag-pathless/Makefile
deleted file mode 100644
index 36b374e0d2e1d..0000000000000
--- a/tests/run-make/extern-flag-pathless/Makefile
+++ /dev/null
@@ -1,34 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-# Test mixing pathless --extern with paths.
-
-# Test for static linking by checking that the binary runs if the dylib
-# is removed and test for dynamic linking by checking that the binary
-# fails to run if the dylib is removed.
-
-all:
-	$(RUSTC) bar.rs --crate-type=rlib --crate-type=dylib -Cprefer-dynamic
-
-	# rlib preferred over dylib
-	$(RUSTC) foo.rs --extern bar
-	mv $(call DYLIB,bar) $(TMPDIR)/bar.tmp
-	$(call RUN,foo)
-	mv $(TMPDIR)/bar.tmp $(call DYLIB,bar)
-
-	$(RUSTC) foo.rs --extern bar=$(TMPDIR)/libbar.rlib --extern bar
-	mv $(call DYLIB,bar) $(TMPDIR)/bar.tmp
-	$(call RUN,foo)
-	mv $(TMPDIR)/bar.tmp $(call DYLIB,bar)
-
-	# explicit --extern overrides pathless
-	$(RUSTC) foo.rs --extern bar=$(call DYLIB,bar) --extern bar
-	mv $(call DYLIB,bar) $(TMPDIR)/bar.tmp
-	$(call FAIL,foo)
-	mv $(TMPDIR)/bar.tmp $(call DYLIB,bar)
-
-	# prefer-dynamic does what it says
-	$(RUSTC) foo.rs --extern bar -C prefer-dynamic
-	mv $(call DYLIB,bar) $(TMPDIR)/bar.tmp
-	$(call FAIL,foo)
-	mv $(TMPDIR)/bar.tmp $(call DYLIB,bar)
diff --git a/tests/run-make/extern-flag-pathless/rmake.rs b/tests/run-make/extern-flag-pathless/rmake.rs
new file mode 100644
index 0000000000000..9cf828abcb8b4
--- /dev/null
+++ b/tests/run-make/extern-flag-pathless/rmake.rs
@@ -0,0 +1,43 @@
+// It is possible, since #64882, to use the --extern flag without an explicit
+// path. In the event of two --extern flags, the explicit one with a path will take
+// priority, but otherwise, it is a more concise way of fetching specific libraries.
+// This test checks that the default priority of explicit extern flags and rlibs is
+// respected.
+// See https://github.com/rust-lang/rust/pull/64882
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+
+use run_make_support::{dynamic_lib_name, fs_wrapper, run, run_fail, rust_lib_name, rustc};
+
+fn main() {
+    rustc().input("bar.rs").crate_type("rlib").crate_type("dylib").arg("-Cprefer-dynamic").run();
+
+    // By default, the rlib has priority over the dylib.
+    rustc().input("foo.rs").arg("--extern").arg("bar").run();
+    fs_wrapper::rename(dynamic_lib_name("bar"), "bar.tmp");
+    run("foo");
+    fs_wrapper::rename("bar.tmp", dynamic_lib_name("bar"));
+
+    rustc().input("foo.rs").extern_("bar", rust_lib_name("bar")).arg("--extern").arg("bar").run();
+    fs_wrapper::rename(dynamic_lib_name("bar"), "bar.tmp");
+    run("foo");
+    fs_wrapper::rename("bar.tmp", dynamic_lib_name("bar"));
+
+    // The first explicit usage of extern overrides the second pathless --extern bar.
+    rustc()
+        .input("foo.rs")
+        .extern_("bar", dynamic_lib_name("bar"))
+        .arg("--extern")
+        .arg("bar")
+        .run();
+    fs_wrapper::rename(dynamic_lib_name("bar"), "bar.tmp");
+    run_fail("foo");
+    fs_wrapper::rename("bar.tmp", dynamic_lib_name("bar"));
+
+    // With prefer-dynamic, execution fails as it refuses to use the rlib.
+    rustc().input("foo.rs").arg("--extern").arg("bar").arg("-Cprefer-dynamic").run();
+    fs_wrapper::rename(dynamic_lib_name("bar"), "bar.tmp");
+    run_fail("foo");
+    fs_wrapper::rename("bar.tmp", dynamic_lib_name("bar"));
+}
diff --git a/tests/run-make/extra-filename-with-temp-outputs/Makefile b/tests/run-make/extra-filename-with-temp-outputs/Makefile
deleted file mode 100644
index 64745bef5b869..0000000000000
--- a/tests/run-make/extra-filename-with-temp-outputs/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	$(RUSTC) -C extra-filename=bar foo.rs -C save-temps
-	rm $(TMPDIR)/foobar.foo*0.rcgu.o
-	rm $(TMPDIR)/$(call BIN,foobar)
diff --git a/tests/run-make/extra-filename-with-temp-outputs/rmake.rs b/tests/run-make/extra-filename-with-temp-outputs/rmake.rs
new file mode 100644
index 0000000000000..c39e397a7cb35
--- /dev/null
+++ b/tests/run-make/extra-filename-with-temp-outputs/rmake.rs
@@ -0,0 +1,21 @@
+// In order to prevent temporary files from overwriting each other in parallel
+// compilation, rustc was changed to mix an extra filename with temporary
+// outputs. However, as this is a similar behavior with the codegen flag
+// -C extra-filename, this test checks that the manually passed flag
+// is not overwritten by this feature, and that the output files
+// are named as expected.
+// See https://github.com/rust-lang/rust/pull/15686
+
+use run_make_support::{
+    bin_name, cwd, fs_wrapper, has_prefix, has_suffix, rustc, shallow_find_files,
+};
+
+fn main() {
+    rustc().extra_filename("bar").input("foo.rs").arg("-Csave-temps").run();
+    let object_files = shallow_find_files(cwd(), |path| {
+        has_prefix(path, "foobar.foo") && has_suffix(path, "0.rcgu.o")
+    });
+    let object_file = object_files.get(0).unwrap();
+    fs_wrapper::remove_file(object_file);
+    fs_wrapper::remove_file(bin_name("foobar"));
+}
diff --git a/tests/run-make/issue-83112-incr-test-moved-file/main.rs b/tests/run-make/incr-test-moved-file/main.rs
similarity index 100%
rename from tests/run-make/issue-83112-incr-test-moved-file/main.rs
rename to tests/run-make/incr-test-moved-file/main.rs
diff --git a/tests/run-make/incr-test-moved-file/rmake.rs b/tests/run-make/incr-test-moved-file/rmake.rs
new file mode 100644
index 0000000000000..ae142a0d22e86
--- /dev/null
+++ b/tests/run-make/incr-test-moved-file/rmake.rs
@@ -0,0 +1,27 @@
+// The generated test harness code contains spans with a dummy location,
+// but a non-dummy SyntaxContext. Previously, the incremental cache was encoding
+// these spans as a full span (with a source file index), instead of skipping
+// the encoding of the location information. If the file gest moved, the hash
+// of the span will be unchanged (since it has a dummy location), so the incr
+// cache would end up try to load a non-existent file using the previously
+// enccoded source file id.
+// This test reproduces the steps that used to trigger this bug, and checks
+// for successful compilation.
+// See https://github.com/rust-lang/rust/issues/83112
+
+//@ ignore-none
+// Reason: no-std is not supported
+//@ ignore-nvptx64-nvidia-cuda
+// FIXME: can't find crate for 'std'
+
+use run_make_support::{fs_wrapper, rust_lib_name, rustc};
+
+fn main() {
+    fs_wrapper::create_dir("incr");
+    fs_wrapper::create_dir("src");
+    fs_wrapper::create_dir("src/mydir");
+    fs_wrapper::copy("main.rs", "src/main.rs");
+    rustc().input("src/main.rs").incremental("incr").arg("--test").run();
+    fs_wrapper::rename("src/main.rs", "src/mydir/main.rs");
+    rustc().input("src/mydir/main.rs").incremental("incr").arg("--test").run();
+}
diff --git a/tests/run-make/intrinsic-unreachable/Makefile b/tests/run-make/intrinsic-unreachable/Makefile
deleted file mode 100644
index ff9cc57098c6b..0000000000000
--- a/tests/run-make/intrinsic-unreachable/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-include ../tools.mk
-
-# needs-asm-support
-# ignore-windows-msvc
-#
-# Because of Windows exception handling, the code is not necessarily any shorter.
-# https://github.com/llvm-mirror/llvm/commit/64b2297786f7fd6f5fa24cdd4db0298fbf211466
-
-all:
-	$(RUSTC) -O --emit asm exit-ret.rs
-	$(RUSTC) -O --emit asm exit-unreachable.rs
-	test `wc -l < $(TMPDIR)/exit-unreachable.s` -lt `wc -l < $(TMPDIR)/exit-ret.s`
diff --git a/tests/run-make/intrinsic-unreachable/rmake.rs b/tests/run-make/intrinsic-unreachable/rmake.rs
new file mode 100644
index 0000000000000..7e78c8288b821
--- /dev/null
+++ b/tests/run-make/intrinsic-unreachable/rmake.rs
@@ -0,0 +1,20 @@
+// intrinsics::unreachable tells the compiler that a certain point in the code
+// is not reachable by any means, which enables some useful optimizations.
+// In this test, exit-unreachable contains this instruction and exit-ret does not,
+// which means the emitted artifacts should be shorter in length.
+// See https://github.com/rust-lang/rust/pull/16970
+
+//@ needs-asm-support
+//@ ignore-windows
+// Reason: Because of Windows exception handling, the code is not necessarily any shorter.
+
+use run_make_support::{fs_wrapper, rustc};
+
+fn main() {
+    rustc().opt().emit("asm").input("exit-ret.rs").run();
+    rustc().opt().emit("asm").input("exit-unreachable.rs").run();
+    assert!(
+        fs_wrapper::read_to_string("exit-unreachable.s").lines().count()
+            < fs_wrapper::read_to_string("exit-ret.s").lines().count()
+    );
+}
diff --git a/tests/run-make/issue-109934-lto-debuginfo/Makefile b/tests/run-make/issue-109934-lto-debuginfo/Makefile
deleted file mode 100644
index 3b7a99d3dbc62..0000000000000
--- a/tests/run-make/issue-109934-lto-debuginfo/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-# With the upgrade to LLVM 16, this was getting:
-#
-#   error: Cannot represent a difference across sections
-#
-# The error stemmed from DI function definitions under type scopes, fixed by
-# only declaring in type scope and defining the subprogram elsewhere.
-
-all:
-	$(RUSTC) lib.rs --test -C lto=fat -C debuginfo=2 -C incremental=$(TMPDIR)/inc-fat
diff --git a/tests/run-make/issue-109934-lto-debuginfo/lib.rs b/tests/run-make/issue-109934-lto-debuginfo/lib.rs
deleted file mode 100644
index c405928bd1824..0000000000000
--- a/tests/run-make/issue-109934-lto-debuginfo/lib.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-extern crate alloc;
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn something_alloc() {
-        assert_eq!(Vec::<u32>::new(), Vec::<u32>::new());
-    }
-}
diff --git a/tests/run-make/issue-37839/Makefile b/tests/run-make/issue-37839/Makefile
deleted file mode 100644
index 6bad27b7bdcd2..0000000000000
--- a/tests/run-make/issue-37839/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	$(RUSTC) a.rs && $(RUSTC) b.rs
-	$(BARE_RUSTC) c.rs -L dependency=$(TMPDIR) --extern b=$(TMPDIR)/libb.rlib \
-		--out-dir=$(TMPDIR)
diff --git a/tests/run-make/issue-83112-incr-test-moved-file/Makefile b/tests/run-make/issue-83112-incr-test-moved-file/Makefile
deleted file mode 100644
index a00088cd9d61b..0000000000000
--- a/tests/run-make/issue-83112-incr-test-moved-file/Makefile
+++ /dev/null
@@ -1,25 +0,0 @@
-include ../tools.mk
-
-# ignore-none no-std is not supported
-# ignore-nvptx64-nvidia-cuda FIXME: can't find crate for 'std'
-
-# Regression test for issue #83112
-# The generated test harness code contains spans with a dummy location,
-# but a non-dummy SyntaxContext. Previously, the incremental cache was encoding
-# these spans as a full span (with a source file index), instead of skipping
-# the encoding of the location information. If the file gest moved, the hash
-# of the span will be unchanged (since it has a dummy location), so the incr
-# cache would end up try to load a non-existent file using the previously
-# enccoded source file id.
-
-SRC=$(TMPDIR)/src
-INCR=$(TMPDIR)/incr
-
-all:
-	mkdir $(SRC)
-	mkdir $(SRC)/mydir
-	mkdir $(INCR)
-	cp main.rs $(SRC)/main.rs
-	$(RUSTC) --test -C incremental=$(INCR) $(SRC)/main.rs --target $(TARGET)
-	mv $(SRC)/main.rs $(SRC)/mydir/main.rs
-	$(RUSTC) --test -C incremental=$(INCR) $(SRC)/mydir/main.rs --target $(TARGET)
diff --git a/tests/run-make/issue-85019-moved-src-dir/Makefile b/tests/run-make/issue-85019-moved-src-dir/Makefile
deleted file mode 100644
index dec289058f936..0000000000000
--- a/tests/run-make/issue-85019-moved-src-dir/Makefile
+++ /dev/null
@@ -1,28 +0,0 @@
-include ../tools.mk
-
-INCR=$(TMPDIR)/incr
-FIRST_SRC=$(TMPDIR)/first_src
-SECOND_SRC=$(TMPDIR)/second_src
-
-# ignore-none no-std is not supported
-# ignore-nvptx64-nvidia-cuda FIXME: can't find crate for 'std'
-
-# Tests that we don't get an ICE when the working directory
-# (but not the build directory!) changes between compilation
-# sessions
-
-all:
-	mkdir $(INCR)
-	# Build from 'FIRST_SRC'
-	mkdir $(FIRST_SRC)
-	cp my_lib.rs $(FIRST_SRC)/my_lib.rs
-	cp main.rs $(FIRST_SRC)/main.rs
-	cd $(FIRST_SRC) && \
-		$(RUSTC) -C incremental=$(INCR) --crate-type lib my_lib.rs --target $(TARGET) && \
-		$(RUSTC) -C incremental=$(INCR) --extern my_lib=$(TMPDIR)/libmy_lib.rlib main.rs --target $(TARGET)
-	# Build from 'SECOND_SRC', keeping the output directory and incremental directory
-	# the same
-	mv $(FIRST_SRC) $(SECOND_SRC)
-	cd $(SECOND_SRC) && \
-		$(RUSTC) -C incremental=$(INCR) --crate-type lib my_lib.rs --target $(TARGET) && \
-		$(RUSTC) -C incremental=$(INCR) --extern my_lib=$(TMPDIR)/libmy_lib.rlib main.rs --target $(TARGET)
diff --git a/tests/run-make/llvm-ident/rmake.rs b/tests/run-make/llvm-ident/rmake.rs
index 6934a4b36d013..9699d0579f6ef 100644
--- a/tests/run-make/llvm-ident/rmake.rs
+++ b/tests/run-make/llvm-ident/rmake.rs
@@ -2,9 +2,9 @@
 //@ ignore-cross-compile
 
 use run_make_support::llvm::llvm_bin_dir;
-use run_make_support::{cmd, env_var, llvm_filecheck, read_dir, rustc, source_root};
-
-use std::ffi::OsStr;
+use run_make_support::{
+    cmd, env_var, has_extension, llvm_filecheck, rustc, shallow_find_files, source_root,
+};
 
 fn main() {
     // `-Ccodegen-units=16 -Copt-level=2` is used here to trigger thin LTO
@@ -22,20 +22,14 @@ fn main() {
 
     // `llvm-dis` is used here since `--emit=llvm-ir` does not emit LLVM IR
     // for temporary outputs.
-    let mut files = Vec::new();
-    read_dir(".", |path| {
-        if path.is_file() && path.extension().is_some_and(|ext| ext == OsStr::new("bc")) {
-            files.push(path.to_path_buf());
-        }
-    });
+    let files = shallow_find_files(".", |path| has_extension(path, "bc"));
     cmd(llvm_bin_dir().join("llvm-dis")).args(files).run();
 
     // Check LLVM IR files (including temporary outputs) have `!llvm.ident`
     // named metadata, reusing the related codegen test.
     let llvm_ident_path = source_root().join("tests/codegen/llvm-ident.rs");
-    read_dir(".", |path| {
-        if path.is_file() && path.extension().is_some_and(|ext| ext == OsStr::new("ll")) {
-            llvm_filecheck().input_file(path).arg(&llvm_ident_path).run();
-        }
-    });
+    let files = shallow_find_files(".", |path| has_extension(path, "ll"));
+    for file in files {
+        llvm_filecheck().input_file(file).arg(&llvm_ident_path).run();
+    }
 }
diff --git a/tests/run-make/metadata-dep-info/Makefile b/tests/run-make/metadata-dep-info/Makefile
deleted file mode 100644
index d48cbe0f29505..0000000000000
--- a/tests/run-make/metadata-dep-info/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-include ../tools.mk
-
-all:
-	$(RUSTC) --emit=metadata,dep-info --crate-type lib dash-separated.rs -C extra-filename=_something-extra
-	# Strip TMPDIR since it is a machine specific absolute path
-	sed "s%.*[/\\]%%" "$(TMPDIR)"/dash-separated_something-extra.d > "$(TMPDIR)"/dash-separated_something-extra.normalized.d
-	$(RUSTC_TEST_OP) "$(TMPDIR)"/dash-separated_something-extra.normalized.d dash-separated_something-extra.normalized.d
diff --git a/tests/run-make/metadata-dep-info/dash-separated_something-extra.normalized.d b/tests/run-make/metadata-dep-info/dash-separated_something-extra.expected.d
similarity index 100%
rename from tests/run-make/metadata-dep-info/dash-separated_something-extra.normalized.d
rename to tests/run-make/metadata-dep-info/dash-separated_something-extra.expected.d
diff --git a/tests/run-make/metadata-dep-info/rmake.rs b/tests/run-make/metadata-dep-info/rmake.rs
new file mode 100644
index 0000000000000..f4bb3ea63fb16
--- /dev/null
+++ b/tests/run-make/metadata-dep-info/rmake.rs
@@ -0,0 +1,20 @@
+// Emitting dep-info alongside metadata would present subtle discrepancies
+// in the output file, such as the filename transforming underscores_ into hyphens-.
+// After the fix in #114750, this test checks that the emitted files are identical
+// to the expected output.
+// See https://github.com/rust-lang/rust/issues/68839
+
+use run_make_support::{diff, rustc};
+
+fn main() {
+    rustc()
+        .emit("metadata,dep-info")
+        .crate_type("lib")
+        .input("dash-separated.rs")
+        .extra_filename("_something-extra")
+        .run();
+    diff()
+        .expected_file("dash-separated_something-extra.expected.d")
+        .actual_file("dash-separated_something-extra.d")
+        .run();
+}
diff --git a/tests/run-make/issue-85019-moved-src-dir/main.rs b/tests/run-make/moved-src-dir-fingerprint-ice/main.rs
similarity index 100%
rename from tests/run-make/issue-85019-moved-src-dir/main.rs
rename to tests/run-make/moved-src-dir-fingerprint-ice/main.rs
diff --git a/tests/run-make/issue-85019-moved-src-dir/my_lib.rs b/tests/run-make/moved-src-dir-fingerprint-ice/my_lib.rs
similarity index 100%
rename from tests/run-make/issue-85019-moved-src-dir/my_lib.rs
rename to tests/run-make/moved-src-dir-fingerprint-ice/my_lib.rs
diff --git a/tests/run-make/moved-src-dir-fingerprint-ice/rmake.rs b/tests/run-make/moved-src-dir-fingerprint-ice/rmake.rs
new file mode 100644
index 0000000000000..c642602998922
--- /dev/null
+++ b/tests/run-make/moved-src-dir-fingerprint-ice/rmake.rs
@@ -0,0 +1,38 @@
+// A SourceFile created during compilation may have a relative
+// path (e.g. if rustc itself is invoked with a relative path).
+// When we write out crate metadata, we convert all relative paths
+// to absolute paths using the current working directory.
+// However, the working directory was previously not included in the crate hash.
+// This meant that the crate metadata could change while the crate
+// hash remained the same. Among other problems, this could cause a
+// fingerprint mismatch ICE, since incremental compilation uses
+// the crate metadata hash to determine if a foreign query is green.
+// This test checks that we don't get an ICE when the working directory
+// (but not the build directory!) changes between compilation
+// sessions.
+// See https://github.com/rust-lang/rust/issues/85019
+
+//@ ignore-none
+// Reason: no-std is not supported
+//@ ignore-nvptx64-nvidia-cuda
+// FIXME: can't find crate for 'std'
+
+use run_make_support::{fs_wrapper, rust_lib_name, rustc};
+
+fn main() {
+    fs_wrapper::create_dir("incr");
+    fs_wrapper::create_dir("first_src");
+    fs_wrapper::create_dir("output");
+    fs_wrapper::rename("my_lib.rs", "first_src/my_lib.rs");
+    fs_wrapper::rename("main.rs", "first_src/main.rs");
+    // Build from "first_src"
+    std::env::set_current_dir("first_src").unwrap();
+    rustc().input("my_lib.rs").incremental("incr").crate_type("lib").run();
+    rustc().input("main.rs").incremental("incr").extern_("my_lib", rust_lib_name("my_lib")).run();
+    std::env::set_current_dir("..").unwrap();
+    fs_wrapper::rename("first_src", "second_src");
+    std::env::set_current_dir("second_src").unwrap();
+    // Build from "second_src" - the output and incremental directory remain identical
+    rustc().input("my_lib.rs").incremental("incr").crate_type("lib").run();
+    rustc().input("main.rs").incremental("incr").extern_("my_lib", rust_lib_name("my_lib")).run();
+}
diff --git a/tests/run-make/pass-linker-flags-flavor/Makefile b/tests/run-make/pass-linker-flags-flavor/Makefile
deleted file mode 100644
index 1bb05d0f97478..0000000000000
--- a/tests/run-make/pass-linker-flags-flavor/Makefile
+++ /dev/null
@@ -1,11 +0,0 @@
-# only-linux
-
-include ../tools.mk
-
-all:
-	$(RUSTC) empty.rs -Z unstable-options -C linker-flavor=gnu-cc -l static=l1 -l link-arg=a1 -l static=l2 -l link-arg=a2 -l dylib=d1 -l link-arg=a3 --print link-args | $(CGREP) -e 'l1.*-Wl,a1.*l2.*-Wl,a2.*d1.*-Wl,a3'
-	$(RUSTC) empty.rs -Z unstable-options -C linker-flavor=gnu-cc -l static=l1 -l link-arg:+verbatim=a1 -l static=l2 -l link-arg=a2 -l dylib=d1 -l link-arg=a3 --print link-args | $(CGREP) -e 'l1.*"a1".*l2.*-Wl,a2.*d1.*-Wl,a3'
-	$(RUSTC) empty.rs -Z unstable-options -C linker-flavor=ld -l static=l1 -l link-arg=a1 -l static=l2 -l link-arg=a2 -l dylib=d1 -l link-arg=a3 --print link-args | $(CGREP) -e 'l1.*"a1".*l2.*"a2".*d1.*"a3"'
-	$(RUSTC) attribute.rs -Z unstable-options -C linker-flavor=gnu-cc --print link-args | $(CGREP) -e 'l1.*-Wl,a1.*l2.*-Wl,a2.*d1.*-Wl,a3'
-	$(RUSTC) --cfg 'feature="verbatim"' attribute.rs -Z unstable-options -C linker-flavor=gnu-cc --print link-args | $(CGREP) -e 'l1.*"a1".*l2.*-Wl,a2.*d1.*-Wl,a3'
-	$(RUSTC) attribute.rs -C linker-flavor=ld --print link-args | $(CGREP) -e 'l1.*"a1".*l2.*"a2".*d1.*"a3"'
diff --git a/tests/run-make/pass-linker-flags-flavor/rmake.rs b/tests/run-make/pass-linker-flags-flavor/rmake.rs
new file mode 100644
index 0000000000000..e36d68cc88432
--- /dev/null
+++ b/tests/run-make/pass-linker-flags-flavor/rmake.rs
@@ -0,0 +1,84 @@
+// Setting the linker flavor as a C compiler should cause the output of the -l flags to be
+// prefixed by -Wl, except when a flag is requested to be verbatim. A bare linker (ld) should
+// never cause prefixes to appear in the output. This test checks this ruleset twice, once with
+// explicit flags and then with those flags passed inside the rust source code.
+// See https://github.com/rust-lang/rust/pull/118202
+
+//@ only-linux
+// Reason: the `gnu-cc` linker is only available on linux
+
+use run_make_support::{regex, rustc};
+
+fn main() {
+    let out_gnu = rustc()
+        .input("empty.rs")
+        .linker_flavor("gnu-cc")
+        .arg("-Zunstable-options")
+        .arg("-lstatic=l1")
+        .arg("-llink-arg=a1")
+        .arg("-lstatic=l2")
+        .arg("-llink-arg=a2")
+        .arg("-ldylib=d1")
+        .arg("-llink-arg=a3")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+    let out_gnu_verbatim = rustc()
+        .input("empty.rs")
+        .linker_flavor("gnu-cc")
+        .arg("-Zunstable-options")
+        .arg("-lstatic=l1")
+        .arg("-llink-arg:+verbatim=a1")
+        .arg("-lstatic=l2")
+        .arg("-llink-arg=a2")
+        .arg("-ldylib=d1")
+        .arg("-llink-arg=a3")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+    let out_ld = rustc()
+        .input("empty.rs")
+        .linker_flavor("ld")
+        .arg("-Zunstable-options")
+        .arg("-lstatic=l1")
+        .arg("-llink-arg=a1")
+        .arg("-lstatic=l2")
+        .arg("-llink-arg=a2")
+        .arg("-ldylib=d1")
+        .arg("-llink-arg=a3")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+    let out_att_gnu = rustc()
+        .arg("-Zunstable-options")
+        .linker_flavor("gnu-cc")
+        .input("attribute.rs")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+    let out_att_gnu_verbatim = rustc()
+        .cfg(r#"feature="verbatim""#)
+        .arg("-Zunstable-options")
+        .linker_flavor("gnu-cc")
+        .input("attribute.rs")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+    let out_att_ld = rustc()
+        .linker_flavor("ld")
+        .input("attribute.rs")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+
+    let no_verbatim = regex::Regex::new("l1.*-Wl,a1.*l2.*-Wl,a2.*d1.*-Wl,a3").unwrap();
+    let one_verbatim = regex::Regex::new(r#"l1.*"a1".*l2.*-Wl,a2.*d1.*-Wl,a3"#).unwrap();
+    let ld = regex::Regex::new(r#"l1.*"a1".*l2.*"a2".*d1.*"a3""#).unwrap();
+
+    assert!(no_verbatim.is_match(&out_gnu));
+    assert!(no_verbatim.is_match(&out_att_gnu));
+    assert!(one_verbatim.is_match(&out_gnu_verbatim));
+    assert!(one_verbatim.is_match(&out_att_gnu_verbatim));
+    assert!(ld.is_match(&out_ld));
+    assert!(ld.is_match(&out_att_ld));
+}
diff --git a/tests/run-make/pass-linker-flags-from-dep/Makefile b/tests/run-make/pass-linker-flags-from-dep/Makefile
deleted file mode 100644
index 48b3b26ce81e6..0000000000000
--- a/tests/run-make/pass-linker-flags-from-dep/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-include ../tools.mk
-
-all:
-	# Build deps
-	$(RUSTC) native_dep_1.rs --crate-type=staticlib
-	$(RUSTC) native_dep_2.rs --crate-type=staticlib
-	$(RUSTC) rust_dep_flag.rs -l static:-bundle=native_dep_1 -l link-arg=some_flag -l static:-bundle=native_dep_2 --crate-type=lib -Z unstable-options
-	$(RUSTC) rust_dep_attr.rs --crate-type=lib
-
-	# Check sequence of linker args
-	$(RUSTC) main.rs --extern lib=$(TMPDIR)/librust_dep_flag.rlib --crate-type=bin --print link-args | $(CGREP) -e 'native_dep_1.*some_flag.*native_dep_2'
-	$(RUSTC) main.rs --extern lib=$(TMPDIR)/librust_dep_attr.rlib --crate-type=bin --print link-args | $(CGREP) -e 'native_dep_1.*some_flag.*native_dep_2'
diff --git a/tests/run-make/pass-linker-flags-from-dep/rmake.rs b/tests/run-make/pass-linker-flags-from-dep/rmake.rs
new file mode 100644
index 0000000000000..4b8e0486e1427
--- /dev/null
+++ b/tests/run-make/pass-linker-flags-from-dep/rmake.rs
@@ -0,0 +1,43 @@
+// A similar test to pass-linker-flags, testing that the `-l link-arg` flag
+// respects the order relative to other `-l` flags, but this time, the flags
+// are passed on the compilation of a dependency. This test checks that the
+// downstream compiled binary contains the linker arguments of the dependency,
+// and in the correct order.
+// See https://github.com/rust-lang/rust/issues/99427
+
+use run_make_support::{regex, rust_lib_name, rustc};
+
+fn main() {
+    // Build dependencies
+    rustc().input("native_dep_1.rs").crate_type("staticlib").run();
+    rustc().input("native_dep_2.rs").crate_type("staticlib").run();
+    rustc()
+        .input("rust_dep_flag.rs")
+        .arg("-lstatic:-bundle=native_dep_1")
+        .arg("-llink-arg=some_flag")
+        .arg("-lstatic:-bundle=native_dep_2")
+        .crate_type("lib")
+        .arg("-Zunstable-options")
+        .run();
+    rustc().input("rust_dep_attr.rs").crate_type("lib").run();
+
+    // Check sequence of linker arguments
+    let out_flag = rustc()
+        .input("main.rs")
+        .extern_("lib", rust_lib_name("rust_dep_flag"))
+        .crate_type("bin")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+    let out_attr = rustc()
+        .input("main.rs")
+        .extern_("lib", rust_lib_name("rust_dep_attr"))
+        .crate_type("bin")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+
+    let re = regex::Regex::new("native_dep_1.*some_flag.*native_dep_2").unwrap();
+    assert!(re.is_match(&out_flag));
+    assert!(re.is_match(&out_attr));
+}
diff --git a/tests/run-make/pass-linker-flags/Makefile b/tests/run-make/pass-linker-flags/Makefile
deleted file mode 100644
index 226943e93bdc0..0000000000000
--- a/tests/run-make/pass-linker-flags/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-include ../tools.mk
-
-all:
-	$(RUSTC) empty.rs -Z unstable-options -l static=l1 -l link-arg=a1 -l static=l2 -l link-arg=a2 -l dylib=d1 -l link-arg=a3 --print link-args | $(CGREP) -e 'l1.*a1.*l2.*a2.*d1.*a3'
-	$(RUSTC) attribute.rs --print link-args | $(CGREP) -e 'l1.*a1.*l2.*a2.*d1.*a3'
diff --git a/tests/run-make/pass-linker-flags/rmake.rs b/tests/run-make/pass-linker-flags/rmake.rs
new file mode 100644
index 0000000000000..de69567a6e60c
--- /dev/null
+++ b/tests/run-make/pass-linker-flags/rmake.rs
@@ -0,0 +1,28 @@
+// This test checks the proper function of `-l link-arg=NAME`, which, unlike
+// -C link-arg, is supposed to guarantee that the order relative to other -l
+// options will be respected. In this test, compilation fails (because none of the
+// link arguments like `a1` exist), but it is still checked if the output contains the
+// link arguments in the exact order they were passed in. `attribute.rs` is a variant
+// of the test where the flags are defined in the rust file itself.
+// See https://github.com/rust-lang/rust/issues/99427
+
+use run_make_support::{regex, rustc};
+
+fn main() {
+    let out = rustc()
+        .input("empty.rs")
+        .arg("-Zunstable-options")
+        .arg("-lstatic=l1")
+        .arg("-llink-arg=a1")
+        .arg("-lstatic=l2")
+        .arg("-llink-arg=a2")
+        .arg("-ldylib=d1")
+        .arg("-llink-arg=a3")
+        .print("link-args")
+        .run_unchecked()
+        .stdout_utf8();
+    let out2 = rustc().input("attribute.rs").print("link-args").run_unchecked().stdout_utf8();
+    let re = regex::Regex::new("l1.*a1.*l2.*a2.*d1.*a3").unwrap();
+    assert!(re.is_match(&out));
+    assert!(re.is_match(&out2));
+}
diff --git a/tests/run-make/issue-37839/a.rs b/tests/run-make/proc-macro-three-crates/a.rs
similarity index 100%
rename from tests/run-make/issue-37839/a.rs
rename to tests/run-make/proc-macro-three-crates/a.rs
diff --git a/tests/run-make/issue-37839/b.rs b/tests/run-make/proc-macro-three-crates/b.rs
similarity index 100%
rename from tests/run-make/issue-37839/b.rs
rename to tests/run-make/proc-macro-three-crates/b.rs
diff --git a/tests/run-make/issue-37839/c.rs b/tests/run-make/proc-macro-three-crates/c.rs
similarity index 100%
rename from tests/run-make/issue-37839/c.rs
rename to tests/run-make/proc-macro-three-crates/c.rs
diff --git a/tests/run-make/proc-macro-three-crates/rmake.rs b/tests/run-make/proc-macro-three-crates/rmake.rs
new file mode 100644
index 0000000000000..d3735540fdd47
--- /dev/null
+++ b/tests/run-make/proc-macro-three-crates/rmake.rs
@@ -0,0 +1,20 @@
+// A compiler bug caused the following issue:
+// If a crate A depends on crate B, and crate B
+// depends on crate C, and crate C contains a procedural
+// macro, compiling crate A would fail.
+// This was fixed in #37846, and this test checks
+// that this bug does not make a resurgence.
+
+use run_make_support::{bare_rustc, cwd, rust_lib_name, rustc};
+
+fn main() {
+    rustc().input("a.rs").run();
+    rustc().input("b.rs").run();
+    let curr_dir = cwd().display().to_string();
+    bare_rustc()
+        .input("c.rs")
+        .arg(format!("-Ldependency={curr_dir}"))
+        .extern_("b", cwd().join(rust_lib_name("b")))
+        .out_dir(cwd())
+        .run();
+}
diff --git a/tests/run-make/sepcomp-cci-copies/Makefile b/tests/run-make/sepcomp-cci-copies/Makefile
deleted file mode 100644
index df289d0b0b1a2..0000000000000
--- a/tests/run-make/sepcomp-cci-copies/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-include ../tools.mk
-
-# Check that cross-crate inlined items are inlined in all compilation units
-# that refer to them, and not in any other compilation units.
-# Note that we have to pass `-C codegen-units=6` because up to two CGUs may be
-# created for each source module (see `rustc_const_eval::monomorphize::partitioning`).
-
-all:
-	$(RUSTC) cci_lib.rs
-	$(RUSTC) foo.rs --emit=llvm-ir -C codegen-units=6 \
-		-Z inline-in-all-cgus
-	[ "$$(cat "$(TMPDIR)"/foo.*.ll | grep -c define\ .*cci_fn)" -eq "2" ]
diff --git a/tests/run-make/sepcomp-cci-copies/rmake.rs b/tests/run-make/sepcomp-cci-copies/rmake.rs
new file mode 100644
index 0000000000000..612a73977feea
--- /dev/null
+++ b/tests/run-make/sepcomp-cci-copies/rmake.rs
@@ -0,0 +1,17 @@
+// Check that cross-crate inlined items are inlined in all compilation units
+// that refer to them, and not in any other compilation units.
+// Note that we have to pass `-C codegen-units=6` because up to two CGUs may be
+// created for each source module (see `rustc_const_eval::monomorphize::partitioning`).
+// See https://github.com/rust-lang/rust/pull/16367
+
+use run_make_support::{
+    count_regex_matches_in_files_with_extension, cwd, fs_wrapper, has_extension, regex, rustc,
+    shallow_find_files,
+};
+
+fn main() {
+    rustc().input("cci_lib.rs").run();
+    rustc().input("foo.rs").emit("llvm-ir").codegen_units(6).arg("-Zinline-in-all-cgus").run();
+    let re = regex::Regex::new(r#"define\ .*cci_fn"#).unwrap();
+    assert_eq!(count_regex_matches_in_files_with_extension(&re, "ll"), 2);
+}
diff --git a/tests/run-make/sepcomp-inlining/Makefile b/tests/run-make/sepcomp-inlining/Makefile
deleted file mode 100644
index 327aeb75e5eda..0000000000000
--- a/tests/run-make/sepcomp-inlining/Makefile
+++ /dev/null
@@ -1,15 +0,0 @@
-include ../tools.mk
-
-# Test that #[inline] functions still get inlined across compilation unit
-# boundaries. Compilation should produce three IR files, but only the two
-# compilation units that have a usage of the #[inline] function should
-# contain a definition. Also, the non-#[inline] function should be defined
-# in only one compilation unit.
-
-all:
-	$(RUSTC) foo.rs --emit=llvm-ir -C codegen-units=3 \
-		-Z inline-in-all-cgus
-	[ "$$(cat "$(TMPDIR)"/foo.*.ll | grep -c define\ i32\ .*inlined)" -eq "0" ]
-	[ "$$(cat "$(TMPDIR)"/foo.*.ll | grep -c define\ internal\ i32\ .*inlined)" -eq "2" ]
-	[ "$$(cat "$(TMPDIR)"/foo.*.ll | grep -c define\ hidden\ i32\ .*normal)" -eq "1" ]
-	[ "$$(cat "$(TMPDIR)"/foo.*.ll | grep -c declare\ hidden\ i32\ .*normal)" -eq "2" ]
diff --git a/tests/run-make/sepcomp-inlining/rmake.rs b/tests/run-make/sepcomp-inlining/rmake.rs
new file mode 100644
index 0000000000000..de7551b9a512d
--- /dev/null
+++ b/tests/run-make/sepcomp-inlining/rmake.rs
@@ -0,0 +1,23 @@
+// Test that #[inline] functions still get inlined across compilation unit
+// boundaries. Compilation should produce three IR files, but only the two
+// compilation units that have a usage of the #[inline] function should
+// contain a definition. Also, the non-#[inline] function should be defined
+// in only one compilation unit.
+// See https://github.com/rust-lang/rust/pull/16367
+
+use run_make_support::{
+    count_regex_matches_in_files_with_extension, cwd, fs_wrapper, has_extension, regex, rustc,
+    shallow_find_files,
+};
+
+fn main() {
+    rustc().input("foo.rs").emit("llvm-ir").codegen_units(3).arg("-Zinline-in-all-cgus").run();
+    let re = regex::Regex::new(r#"define\ i32\ .*inlined"#).unwrap();
+    assert_eq!(count_regex_matches_in_files_with_extension(&re, "ll"), 0);
+    let re = regex::Regex::new(r#"define\ internal\ .*inlined"#).unwrap();
+    assert_eq!(count_regex_matches_in_files_with_extension(&re, "ll"), 2);
+    let re = regex::Regex::new(r#"define\ hidden\ i32\ .*normal"#).unwrap();
+    assert_eq!(count_regex_matches_in_files_with_extension(&re, "ll"), 1);
+    let re = regex::Regex::new(r#"declare\ hidden\ i32\ .*normal"#).unwrap();
+    assert_eq!(count_regex_matches_in_files_with_extension(&re, "ll"), 2);
+}
diff --git a/tests/run-make/sepcomp-separate/Makefile b/tests/run-make/sepcomp-separate/Makefile
deleted file mode 100644
index 62cf54a88fbe9..0000000000000
--- a/tests/run-make/sepcomp-separate/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-include ../tools.mk
-
-# Test that separate compilation actually puts code into separate compilation
-# units.  `foo.rs` defines `magic_fn` in three different modules, which should
-# wind up in three different compilation units.
-
-all:
-	$(RUSTC) foo.rs --emit=llvm-ir -C codegen-units=3
-	[ "$$(cat "$(TMPDIR)"/foo.*.ll | grep -c define\ .*magic_fn)" -eq "3" ]
diff --git a/tests/run-make/sepcomp-separate/rmake.rs b/tests/run-make/sepcomp-separate/rmake.rs
new file mode 100644
index 0000000000000..6f1d22424b5b9
--- /dev/null
+++ b/tests/run-make/sepcomp-separate/rmake.rs
@@ -0,0 +1,15 @@
+// Test that separate compilation actually puts code into separate compilation
+// units.  `foo.rs` defines `magic_fn` in three different modules, which should
+// wind up in three different compilation units.
+// See https://github.com/rust-lang/rust/pull/16367
+
+use run_make_support::{
+    count_regex_matches_in_files_with_extension, cwd, fs_wrapper, has_extension, regex, rustc,
+    shallow_find_files,
+};
+
+fn main() {
+    rustc().input("foo.rs").emit("llvm-ir").codegen_units(3).run();
+    let re = regex::Regex::new(r#"define\ .*magic_fn"#).unwrap();
+    assert_eq!(count_regex_matches_in_files_with_extension(&re, "ll"), 3);
+}
diff --git a/tests/run-make/silly-file-names/Makefile b/tests/run-make/silly-file-names/Makefile
deleted file mode 100644
index e51266c0880b0..0000000000000
--- a/tests/run-make/silly-file-names/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-# ignore-cross-compile we need to execute the binary
-# ignore-windows we create files with < and > in their names
-
-include ../tools.mk
-
-all:
-	echo '"comes from a file with a name that begins with <"' > "$(TMPDIR)/<leading-lt"
-	echo '"comes from a file with a name that ends with >"' > "$(TMPDIR)/trailing-gt>"
-	cp silly-file-names.rs "$(TMPDIR)/silly-file-names.rs"
-	$(RUSTC) "$(TMPDIR)/silly-file-names.rs" -o "$(TMPDIR)/silly-file-names"
-	"$(TMPDIR)/silly-file-names" > "$(TMPDIR)/silly-file-names.run.stdout"
-	$(RUSTC_TEST_OP) "$(TMPDIR)/silly-file-names.run.stdout" silly-file-names.run.stdout
diff --git a/tests/run-make/silly-file-names/rmake.rs b/tests/run-make/silly-file-names/rmake.rs
new file mode 100644
index 0000000000000..9df116146fec3
--- /dev/null
+++ b/tests/run-make/silly-file-names/rmake.rs
@@ -0,0 +1,24 @@
+// There used to be assert! checks in the compiler to error on encountering
+// files starting or ending with < or > respectively, as a preventive measure
+// against "fake" files like <anon>. However, this was not truly required,
+// as rustc has other checks to verify the veracity of a file. This test includes
+// some files with < and > in their names and prints out their output to stdout,
+// expecting no errors.
+// See https://github.com/rust-lang/rust/issues/73419
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+//@ ignore-windows
+// Reason: Windows refuses files with < and > in their names
+
+use run_make_support::{diff, fs_wrapper, run, rustc};
+
+fn main() {
+    fs_wrapper::create_file("<leading-lt");
+    fs_wrapper::write("<leading-lt", r#""comes from a file with a name that begins with <""#);
+    fs_wrapper::create_file("trailing-gt>");
+    fs_wrapper::write("trailing-gt>", r#""comes from a file with a name that ends with >""#);
+    rustc().input("silly-file-names.rs").output("silly-file-names").run();
+    let out = run("silly-file-names").stdout_utf8();
+    diff().expected_file("silly-file-names.run.stdout").actual_text("actual-stdout", out).run();
+}
diff --git a/tests/run-make/symbols-include-type-name/Makefile b/tests/run-make/symbols-include-type-name/Makefile
deleted file mode 100644
index ac26a852e36c1..0000000000000
--- a/tests/run-make/symbols-include-type-name/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-include ../tools.mk
-
-# Check that symbol names for methods include type names, instead of <impl>.
-
-OUT=$(TMPDIR)/lib.s
-
-all:
-	$(RUSTC) --crate-type staticlib --emit asm lib.rs
-	$(CGREP) Def < $(OUT)
diff --git a/tests/run-make/symbols-include-type-name/rmake.rs b/tests/run-make/symbols-include-type-name/rmake.rs
new file mode 100644
index 0000000000000..746c7486bf0c0
--- /dev/null
+++ b/tests/run-make/symbols-include-type-name/rmake.rs
@@ -0,0 +1,12 @@
+// Method names used to be obfuscated when exported into symbols,
+// leaving only an obscure `<impl>`. After the fix in #30328,
+// this test checks that method names are successfully saved in the symbol list.
+// See https://github.com/rust-lang/rust/issues/30260
+
+use run_make_support::{invalid_utf8_contains, rustc};
+
+fn main() {
+    rustc().crate_type("staticlib").emit("asm").input("lib.rs").run();
+    // Check that symbol names for methods include type names, instead of <impl>.
+    invalid_utf8_contains("lib.s", "Def");
+}
diff --git a/tests/run-make/target-cpu-native/Makefile b/tests/run-make/target-cpu-native/Makefile
deleted file mode 100644
index eb3ca1e13aa62..0000000000000
--- a/tests/run-make/target-cpu-native/Makefile
+++ /dev/null
@@ -1,20 +0,0 @@
-include ../tools.mk
-
-# only-linux
-# only-x86_64
-#
-# I *really* don't want to deal with a cross-platform way to compare file sizes,
-# tests in `make` sort of are awful
-
-all: $(TMPDIR)/out.log
-	# Make sure no warnings about "unknown CPU `native`" were emitted
-	if [ "$$(wc -c $(TMPDIR)/out.log | cut -d' ' -f 1)" = "0" ]; then \
-	  echo no warnings generated; \
-	else \
-	  exit 1; \
-	fi
-
-
-$(TMPDIR)/out.log:
-	$(RUSTC) foo.rs -C target-cpu=native 2>&1 | tee $(TMPDIR)/out.log
-	$(call RUN,foo)
diff --git a/tests/run-make/target-cpu-native/rmake.rs b/tests/run-make/target-cpu-native/rmake.rs
new file mode 100644
index 0000000000000..fd5fb6193fe06
--- /dev/null
+++ b/tests/run-make/target-cpu-native/rmake.rs
@@ -0,0 +1,14 @@
+// target-cpu is a codegen flag that generates code for the processor of the host machine
+// running the compilation. This test is a sanity test that this flag does not cause any
+// warnings when used, and that binaries produced by it can also be successfully executed.
+// See https://github.com/rust-lang/rust/pull/23238
+
+use run_make_support::{run, rustc};
+
+fn main() {
+    let out = rustc().input("foo.rs").arg("-Ctarget-cpu=native").run().stderr_utf8();
+    run("foo");
+    // There should be zero warnings emitted - the bug would cause "unknown CPU `native`"
+    // to be printed out.
+    assert!(out.is_empty());
+}
diff --git a/tests/run-make/target-specs/Makefile b/tests/run-make/target-specs/Makefile
deleted file mode 100644
index 161b66021857b..0000000000000
--- a/tests/run-make/target-specs/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-include ../tools.mk
-all:
-	$(RUSTC) foo.rs --target=my-awesome-platform.json --crate-type=lib --emit=asm
-	$(CGREP) -v morestack < $(TMPDIR)/foo.s
-	$(RUSTC) foo.rs --target=my-invalid-platform.json 2>&1 | $(CGREP) "Error loading target specification"
-	$(RUSTC) foo.rs --target=my-incomplete-platform.json 2>&1 | $(CGREP) 'Field llvm-target'
-	RUST_TARGET_PATH=. $(RUSTC) foo.rs --target=my-awesome-platform --crate-type=lib --emit=asm
-	RUST_TARGET_PATH=. $(RUSTC) foo.rs --target=my-x86_64-unknown-linux-gnu-platform --crate-type=lib --emit=asm
-	$(RUSTC) -Z unstable-options --target=my-awesome-platform.json --print target-spec-json > $(TMPDIR)/test-platform.json && $(RUSTC) -Z unstable-options --target=$(TMPDIR)/test-platform.json --print target-spec-json | diff -q $(TMPDIR)/test-platform.json -
-	$(RUSTC) foo.rs --target=definitely-not-builtin-target 2>&1 | $(CGREP) 'may not set is_builtin'
-	$(RUSTC) foo.rs --target=endianness-mismatch 2>&1 | $(CGREP) '"data-layout" claims architecture is little-endian'
-	$(RUSTC) foo.rs --target=mismatching-data-layout --crate-type=lib 2>&1 | $(CGREP) 'data-layout for target'
diff --git a/tests/run-make/target-specs/rmake.rs b/tests/run-make/target-specs/rmake.rs
new file mode 100644
index 0000000000000..d2b5f65083808
--- /dev/null
+++ b/tests/run-make/target-specs/rmake.rs
@@ -0,0 +1,71 @@
+// Target-specific compilation in rustc used to have case-by-case peculiarities in 2014,
+// with the compiler having redundant target types and unspecific names. An overarching rework
+// in #16156 changed the way the target flag functions, and this test attempts compilation
+// with the target flag's bundle of new features to check that compilation either succeeds while
+// using them correctly, or fails with the right error message when using them improperly.
+// See https://github.com/rust-lang/rust/pull/16156
+
+use run_make_support::{diff, fs_wrapper, rustc};
+
+fn main() {
+    rustc().input("foo.rs").target("my-awesome-platform.json").crate_type("lib").emit("asm").run();
+    assert!(!fs_wrapper::read_to_string("foo.s").contains("morestack"));
+    rustc()
+        .input("foo.rs")
+        .target("my-invalid-platform.json")
+        .run_fail()
+        .assert_stderr_contains("Error loading target specification");
+    rustc()
+        .input("foo.rs")
+        .target("my-incomplete-platform.json")
+        .run_fail()
+        .assert_stderr_contains("Field llvm-target");
+    rustc()
+        .env("RUST_TARGET_PATH", ".")
+        .input("foo.rs")
+        .target("my-awesome-platform")
+        .crate_type("lib")
+        .emit("asm")
+        .run();
+    rustc()
+        .env("RUST_TARGET_PATH", ".")
+        .input("foo.rs")
+        .target("my-x86_64-unknown-linux-gnu-platform")
+        .crate_type("lib")
+        .emit("asm")
+        .run();
+    let test_platform = rustc()
+        .arg("-Zunstable-options")
+        .target("my-awesome-platform.json")
+        .print("target-spec-json")
+        .run()
+        .stdout_utf8();
+    fs_wrapper::create_file("test-platform.json");
+    fs_wrapper::write("test-platform.json", test_platform.as_bytes());
+    let test_platform_2 = rustc()
+        .arg("-Zunstable-options")
+        .target("test-platform.json")
+        .print("target-spec-json")
+        .run()
+        .stdout_utf8();
+    diff()
+        .expected_file("test-platform.json")
+        .actual_text("test-platform-2", test_platform_2)
+        .run();
+    rustc()
+        .input("foo.rs")
+        .target("definitely-not-builtin-target")
+        .run_fail()
+        .assert_stderr_contains("may not set is_builtin");
+    rustc()
+        .input("foo.rs")
+        .target("endianness-mismatch")
+        .run_fail()
+        .assert_stderr_contains(r#""data-layout" claims architecture is little-endian"#);
+    rustc()
+        .input("foo.rs")
+        .target("mismatching-data-layout")
+        .crate_type("lib")
+        .run_fail()
+        .assert_stderr_contains("data-layout for target");
+}
diff --git a/tests/run-make/target-without-atomic-cas/Makefile b/tests/run-make/target-without-atomic-cas/Makefile
deleted file mode 100644
index 451f03d66cd23..0000000000000
--- a/tests/run-make/target-without-atomic-cas/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-include ../tools.mk
-
-# The target used below doesn't support atomic CAS operations. Verify that's the case
-all:
-	$(RUSTC) --print cfg --target thumbv6m-none-eabi | $(CGREP) -v 'target_has_atomic="ptr"'
diff --git a/tests/run-make/target-without-atomic-cas/rmake.rs b/tests/run-make/target-without-atomic-cas/rmake.rs
new file mode 100644
index 0000000000000..c8782b6d1a566
--- /dev/null
+++ b/tests/run-make/target-without-atomic-cas/rmake.rs
@@ -0,0 +1,16 @@
+// ARM Cortex-M are a class of processors supported by the rust compiler. However,
+// they cannot support any atomic features, such as Arc. This test simply prints
+// the configuration details of one Cortex target, and checks that the compiler
+// does not falsely list atomic support.
+// See https://github.com/rust-lang/rust/pull/36874
+
+use run_make_support::rustc;
+
+// The target used below doesn't support atomic CAS operations. Verify that's the case
+fn main() {
+    rustc()
+        .print("cfg")
+        .target("thumbv6m-none-eabi")
+        .run()
+        .assert_stdout_not_contains(r#"target_has_atomic="ptr""#);
+}
diff --git a/tests/run-make/track-path-dep-info/Makefile b/tests/run-make/track-path-dep-info/Makefile
deleted file mode 100644
index 0d6c9b1d2f01d..0000000000000
--- a/tests/run-make/track-path-dep-info/Makefile
+++ /dev/null
@@ -1,13 +0,0 @@
-include ../tools.mk
-
-# FIXME(eddyb) provide `HOST_RUSTC` and `TARGET_RUSTC`
-# instead of hardcoding them everywhere they're needed.
-ifeq ($(IS_MUSL_HOST),1)
-ADDITIONAL_ARGS := $(RUSTFLAGS)
-endif
-
-all:
-	# Proc macro
-	$(BARE_RUSTC) $(ADDITIONAL_ARGS) --out-dir $(TMPDIR) macro_def.rs
-	EXISTING_PROC_MACRO_ENV=1 $(RUSTC) --emit dep-info macro_use.rs
-	$(CGREP) "emojis.txt:" < $(TMPDIR)/macro_use.d
diff --git a/tests/run-make/track-path-dep-info/rmake.rs b/tests/run-make/track-path-dep-info/rmake.rs
new file mode 100644
index 0000000000000..f108dc6605129
--- /dev/null
+++ b/tests/run-make/track-path-dep-info/rmake.rs
@@ -0,0 +1,13 @@
+// This test checks the functionality of `tracked_path::path`, a procedural macro
+// feature that adds a dependency to another file inside the procmacro. In this case,
+// the text file is added through this method, and the test checks that the compilation
+// output successfully added the file as a dependency.
+// See https://github.com/rust-lang/rust/pull/84029
+
+use run_make_support::{fs_wrapper, rustc};
+
+fn main() {
+    rustc().input("macro_def.rs").run();
+    rustc().env("EXISTING_PROC_MACRO_ENV", "1").emit("dep-info").input("macro_use.rs").run();
+    assert!(fs_wrapper::read_to_string("macro_use.d").contains("emojis.txt:"));
+}
diff --git a/tests/run-make/track-pgo-dep-info/Makefile b/tests/run-make/track-pgo-dep-info/Makefile
deleted file mode 100644
index 3afe3662fa753..0000000000000
--- a/tests/run-make/track-pgo-dep-info/Makefile
+++ /dev/null
@@ -1,25 +0,0 @@
-# needs-profiler-support
-
-include ../tools.mk
-
-# FIXME(eddyb) provide `HOST_RUSTC` and `TARGET_RUSTC`
-# instead of hardcoding them everywhere they're needed.
-ifeq ($(IS_MUSL_HOST),1)
-ADDITIONAL_ARGS := $(RUSTFLAGS)
-endif
-
-all:
-	# Generate PGO profiles
-	$(BARE_RUSTC) $(ADDITIONAL_ARGS) -Cprofile-generate=$(TMPDIR)/profiles --out-dir $(TMPDIR) main.rs
-	$(TMPDIR)/main
-
-	# Merge profiles
-	"$(LLVM_BIN_DIR)/llvm-profdata" merge \
-		-o "$(TMPDIR)/merged.profdata" \
-		"$(TMPDIR)/profiles" || exit 1
-
-	# Use the profile
-	$(RUSTC) -Cprofile-use=$(TMPDIR)/merged.profdata --emit dep-info main.rs
-
-	# Check that profile file is in depinfo
-	$(CGREP) "merged.profdata" < $(TMPDIR)/main.d
diff --git a/tests/run-make/track-pgo-dep-info/rmake.rs b/tests/run-make/track-pgo-dep-info/rmake.rs
new file mode 100644
index 0000000000000..acfe05cf8ea3d
--- /dev/null
+++ b/tests/run-make/track-pgo-dep-info/rmake.rs
@@ -0,0 +1,23 @@
+// Emitting dep-info files used to not have any mention of PGO profiles used
+// in compilation, which meant these profiles could be changed without consequence.
+// After changing this in #100801, this test checks that the profile data is successfully
+// included in dep-info emit files.
+// See https://github.com/rust-lang/rust/pull/100801
+
+//@ ignore-cross-compile
+// Reason: the binary is executed
+//@ needs-profiler-support
+
+use run_make_support::{fs_wrapper, llvm_profdata, run, rustc};
+
+fn main() {
+    // Generate the profile-guided-optimization (PGO) profiles
+    rustc().profile_generate("profiles").input("main.rs").run();
+    // Merge the profiles
+    run("main");
+    llvm_profdata().merge().output("merged.profdata").input("profiles").run();
+    // Use the profiles in compilation
+    rustc().profile_use("merged.profdata").emit("dep-info").input("main.rs").run();
+    // Check that the profile file is in the dep-info emit file
+    assert!(fs_wrapper::read_to_string("main.d").contains("merged.profdata"));
+}
diff --git a/tests/run-make/type-mismatch-same-crate-name/Makefile b/tests/run-make/type-mismatch-same-crate-name/Makefile
deleted file mode 100644
index a2a2a41c7a5a1..0000000000000
--- a/tests/run-make/type-mismatch-same-crate-name/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-include ../tools.mk
-
-all:
-	# compile two different versions of crateA
-	$(RUSTC) --crate-type=rlib crateA.rs -C metadata=-1 -C extra-filename=-1
-	$(RUSTC) --crate-type=rlib crateA.rs -C metadata=-2 -C extra-filename=-2
-	# make crateB depend on version 1 of crateA
-	$(RUSTC) --crate-type=rlib crateB.rs --extern crateA=$(TMPDIR)/libcrateA-1.rlib
-	# make crateC depend on version 2 of crateA
-	$(RUSTC) crateC.rs --extern crateA=$(TMPDIR)/libcrateA-2.rlib 2>&1 | \
-		tr -d '\r\n' | $(CGREP) -e \
-	"mismatched types.*\
-	crateB::try_foo\(foo2\);.*\
-	expected \`crateA::foo::Foo\`, found \`Foo\`.*\
-	different versions of crate \`crateA\`.*\
-	mismatched types.*\
-	crateB::try_bar\(bar2\);.*\
-	expected trait \`crateA::bar::Bar\`, found trait \`Bar\`.*\
-	different versions of crate \`crateA\`"
diff --git a/tests/run-make/type-mismatch-same-crate-name/rmake.rs b/tests/run-make/type-mismatch-same-crate-name/rmake.rs
new file mode 100644
index 0000000000000..ecf80d88d51c1
--- /dev/null
+++ b/tests/run-make/type-mismatch-same-crate-name/rmake.rs
@@ -0,0 +1,29 @@
+// When a compilation failure deals with seemingly identical types, some helpful
+// errors should be printed.
+// The main use case of this error is when there are two crates
+// (generally different versions of the same crate) with the same name
+// causing a type mismatch. In this test, one of the crates
+// is only introduced as an indirect dependency and the type is accessed via a reexport.
+// See https://github.com/rust-lang/rust/pull/42826
+
+use run_make_support::{rust_lib_name, rustc};
+
+fn main() {
+    rustc().crate_type("rlib").input("crateA.rs").metadata("-1").extra_filename("-1").run();
+    rustc().crate_type("rlib").input("crateA.rs").metadata("-2").extra_filename("-2").run();
+    rustc()
+        .crate_type("rlib")
+        .input("crateB.rs")
+        .extern_("crateA", rust_lib_name("crateA-1"))
+        .run();
+    rustc()
+        .input("crateC.rs")
+        .extern_("crateA", rust_lib_name("crateA-2"))
+        .run_fail()
+        .assert_stderr_contains("mismatched types")
+        .assert_stderr_contains("crateB::try_foo(foo2);")
+        .assert_stderr_contains("different versions of crate `crateA`")
+        .assert_stderr_contains("crateB::try_bar(bar2);")
+        .assert_stderr_contains("expected trait `crateA::bar::Bar`, found trait `Bar`")
+        .assert_stderr_contains("different versions of crate `crateA`");
+}
diff --git a/tests/run-make/wasm-abi/foo.rs b/tests/run-make/wasm-abi/foo.rs
deleted file mode 100644
index 0678eb3ff51ae..0000000000000
--- a/tests/run-make/wasm-abi/foo.rs
+++ /dev/null
@@ -1,87 +0,0 @@
-#![crate_type = "cdylib"]
-#![deny(warnings)]
-#![feature(wasm_abi)]
-
-#[repr(C)]
-#[derive(PartialEq, Debug)]
-pub struct TwoI32 {
-    pub a: i32,
-    pub b: i32,
-}
-
-#[no_mangle]
-pub extern "wasm" fn return_two_i32() -> TwoI32 {
-    TwoI32 { a: 1, b: 2 }
-}
-
-#[repr(C)]
-#[derive(PartialEq, Debug)]
-pub struct TwoI64 {
-    pub a: i64,
-    pub b: i64,
-}
-
-#[no_mangle]
-pub extern "wasm" fn return_two_i64() -> TwoI64 {
-    TwoI64 { a: 3, b: 4 }
-}
-
-#[repr(C)]
-#[derive(PartialEq, Debug)]
-pub struct TwoF32 {
-    pub a: f32,
-    pub b: f32,
-}
-
-#[no_mangle]
-pub extern "wasm" fn return_two_f32() -> TwoF32 {
-    TwoF32 { a: 5., b: 6. }
-}
-
-#[repr(C)]
-#[derive(PartialEq, Debug)]
-pub struct TwoF64 {
-    pub a: f64,
-    pub b: f64,
-}
-
-#[no_mangle]
-pub extern "wasm" fn return_two_f64() -> TwoF64 {
-    TwoF64 { a: 7., b: 8. }
-}
-
-#[repr(C)]
-#[derive(PartialEq, Debug)]
-pub struct Mishmash {
-    pub a: f64,
-    pub b: f32,
-    pub c: i32,
-    pub d: i64,
-    pub e: TwoI32,
-}
-
-#[no_mangle]
-pub extern "wasm" fn return_mishmash() -> Mishmash {
-    Mishmash { a: 9., b: 10., c: 11, d: 12, e: TwoI32 { a: 13, b: 14 } }
-}
-
-#[link(wasm_import_module = "host")]
-extern "wasm" {
-    fn two_i32() -> TwoI32;
-    fn two_i64() -> TwoI64;
-    fn two_f32() -> TwoF32;
-    fn two_f64() -> TwoF64;
-    fn mishmash() -> Mishmash;
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn call_imports() {
-    assert_eq!(two_i32(), TwoI32 { a: 100, b: 101 });
-    assert_eq!(two_i64(), TwoI64 { a: 102, b: 103 });
-    assert_eq!(two_f32(), TwoF32 { a: 104., b: 105. });
-    assert_eq!(two_f64(), TwoF64 { a: 106., b: 107. });
-    assert_eq!(
-        mishmash(),
-        Mishmash { a: 108., b: 109., c: 110, d: 111, e: TwoI32 { a: 112, b: 113 } }
-    );
-}
diff --git a/tests/run-make/wasm-abi/host.wat b/tests/run-make/wasm-abi/host.wat
deleted file mode 100644
index e87097ac8a14b..0000000000000
--- a/tests/run-make/wasm-abi/host.wat
+++ /dev/null
@@ -1,22 +0,0 @@
-(module
-  (func (export "two_i32") (result i32 i32)
-      i32.const 100
-      i32.const 101)
-  (func (export "two_i64") (result i64 i64)
-      i64.const 102
-      i64.const 103)
-  (func (export "two_f32") (result f32 f32)
-      f32.const 104
-      f32.const 105)
-  (func (export "two_f64") (result f64 f64)
-      f64.const 106
-      f64.const 107)
-
-  (func (export "mishmash") (result f64 f32 i32 i64 i32 i32)
-      f64.const 108
-      f32.const 109
-      i32.const 110
-      i64.const 111
-      i32.const 112
-      i32.const 113)
-)
diff --git a/tests/run-make/wasm-abi/rmake.rs b/tests/run-make/wasm-abi/rmake.rs
deleted file mode 100644
index ff12bcd536e7f..0000000000000
--- a/tests/run-make/wasm-abi/rmake.rs
+++ /dev/null
@@ -1,29 +0,0 @@
-//@ only-wasm32-wasip1
-//@ needs-wasmtime
-
-use run_make_support::{cmd, rustc};
-use std::path::Path;
-
-fn main() {
-    rustc().input("foo.rs").target("wasm32-wasip1").run();
-
-    let file = Path::new("foo.wasm");
-
-    run(&file, "return_two_i32", "1\n2\n");
-    run(&file, "return_two_i64", "3\n4\n");
-    run(&file, "return_two_f32", "5\n6\n");
-    run(&file, "return_two_f64", "7\n8\n");
-    run(&file, "return_mishmash", "9\n10\n11\n12\n13\n14\n");
-    run(&file, "call_imports", "");
-}
-
-fn run(file: &Path, method: &str, expected_output: &str) {
-    cmd("wasmtime")
-        .arg("run")
-        .arg("--preload=host=host.wat")
-        .arg("--invoke")
-        .arg(method)
-        .arg(file)
-        .run()
-        .assert_stdout_equals(expected_output);
-}
diff --git a/tests/rustdoc-ui/doctest/block-doc-comment.rs b/tests/rustdoc-ui/doctest/block-doc-comment.rs
index fdb500a8bdfac..df953dc49bee4 100644
--- a/tests/rustdoc-ui/doctest/block-doc-comment.rs
+++ b/tests/rustdoc-ui/doctest/block-doc-comment.rs
@@ -1,6 +1,6 @@
 //@ check-pass
 //@ compile-flags:--test
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 // This test ensures that no code block is detected in the doc comments.
 
diff --git a/tests/rustdoc-ui/doctest/cfg-test.rs b/tests/rustdoc-ui/doctest/cfg-test.rs
index 3b01f8bd0d0ac..573172349acbc 100644
--- a/tests/rustdoc-ui/doctest/cfg-test.rs
+++ b/tests/rustdoc-ui/doctest/cfg-test.rs
@@ -1,7 +1,7 @@
 //@ check-pass
 //@ compile-flags:--test --test-args --test-threads=1
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 // Crates like core have doctests gated on `cfg(not(test))` so we need to make
 // sure `cfg(test)` is not active when running `rustdoc --test`.
diff --git a/tests/rustdoc-ui/doctest/check-cfg-test.rs b/tests/rustdoc-ui/doctest/check-cfg-test.rs
index c96f0c35333f7..b3bff381d64a1 100644
--- a/tests/rustdoc-ui/doctest/check-cfg-test.rs
+++ b/tests/rustdoc-ui/doctest/check-cfg-test.rs
@@ -2,7 +2,7 @@
 //@ compile-flags: --test --nocapture --check-cfg=cfg(feature,values("test")) -Z unstable-options
 //@ normalize-stderr-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 /// The doctest will produce a warning because feature invalid is unexpected
 /// ```
diff --git a/tests/rustdoc-ui/doctest/display-output.rs b/tests/rustdoc-ui/doctest/display-output.rs
index 080d34398a56c..70d15ea6f8a53 100644
--- a/tests/rustdoc-ui/doctest/display-output.rs
+++ b/tests/rustdoc-ui/doctest/display-output.rs
@@ -4,7 +4,7 @@
 //@ edition:2018
 //@ compile-flags:--test --test-args=--show-output
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 /// ```
 /// #![warn(unused)]
diff --git a/tests/rustdoc-ui/doctest/doc-comment-multi-line-attr.rs b/tests/rustdoc-ui/doctest/doc-comment-multi-line-attr.rs
index c09796df6f1d5..f95d6f82933a1 100644
--- a/tests/rustdoc-ui/doctest/doc-comment-multi-line-attr.rs
+++ b/tests/rustdoc-ui/doctest/doc-comment-multi-line-attr.rs
@@ -1,7 +1,7 @@
 // Regression test for #97440: Multiline inner attribute triggers ICE during doctest
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ check-pass
 
 //! ```rust
diff --git a/tests/rustdoc-ui/doctest/doc-comment-multi-line-cfg-attr.rs b/tests/rustdoc-ui/doctest/doc-comment-multi-line-cfg-attr.rs
index 832f720ef3f6c..8cafadfdc8293 100644
--- a/tests/rustdoc-ui/doctest/doc-comment-multi-line-cfg-attr.rs
+++ b/tests/rustdoc-ui/doctest/doc-comment-multi-line-cfg-attr.rs
@@ -1,6 +1,6 @@
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ check-pass
 
 /// ```
diff --git a/tests/rustdoc-ui/doctest/doc-test-doctest-feature.rs b/tests/rustdoc-ui/doctest/doc-test-doctest-feature.rs
index 2bec9414f1d72..fca1f51ed216c 100644
--- a/tests/rustdoc-ui/doctest/doc-test-doctest-feature.rs
+++ b/tests/rustdoc-ui/doctest/doc-test-doctest-feature.rs
@@ -1,7 +1,7 @@
 //@ check-pass
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 // Make sure `cfg(doctest)` is set when finding doctests but not inside
 // the doctests.
diff --git a/tests/rustdoc-ui/doctest/doc-test-rustdoc-feature.rs b/tests/rustdoc-ui/doctest/doc-test-rustdoc-feature.rs
index 765bbd244a603..6d12d7af56acc 100644
--- a/tests/rustdoc-ui/doctest/doc-test-rustdoc-feature.rs
+++ b/tests/rustdoc-ui/doctest/doc-test-rustdoc-feature.rs
@@ -1,7 +1,7 @@
 //@ check-pass
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 #![feature(doc_cfg)]
 
diff --git a/tests/rustdoc-ui/doctest/doctest-multiline-crate-attribute.rs b/tests/rustdoc-ui/doctest/doctest-multiline-crate-attribute.rs
index c626c3b626106..b446492e47244 100644
--- a/tests/rustdoc-ui/doctest/doctest-multiline-crate-attribute.rs
+++ b/tests/rustdoc-ui/doctest/doctest-multiline-crate-attribute.rs
@@ -1,6 +1,6 @@
 //@ compile-flags:--test --test-args=--test-threads=1
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ check-pass
 
 /// ```
diff --git a/tests/rustdoc-ui/doctest/doctest-output.rs b/tests/rustdoc-ui/doctest/doctest-output.rs
index 0bd032669f8e4..72394a4bed311 100644
--- a/tests/rustdoc-ui/doctest/doctest-output.rs
+++ b/tests/rustdoc-ui/doctest/doctest-output.rs
@@ -2,7 +2,7 @@
 //@ aux-build:extern_macros.rs
 //@ compile-flags:--test --test-args=--test-threads=1
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ check-pass
 
 //! ```
diff --git a/tests/rustdoc-ui/doctest/failed-doctest-compile-fail.rs b/tests/rustdoc-ui/doctest/failed-doctest-compile-fail.rs
index 5e79ee04687a3..4d0e035f86e07 100644
--- a/tests/rustdoc-ui/doctest/failed-doctest-compile-fail.rs
+++ b/tests/rustdoc-ui/doctest/failed-doctest-compile-fail.rs
@@ -3,7 +3,7 @@
 
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 
 /// ```compile_fail
diff --git a/tests/rustdoc-ui/doctest/failed-doctest-extra-semicolon-on-item.rs b/tests/rustdoc-ui/doctest/failed-doctest-extra-semicolon-on-item.rs
index bedb2ac64dba2..b65ef43270588 100644
--- a/tests/rustdoc-ui/doctest/failed-doctest-extra-semicolon-on-item.rs
+++ b/tests/rustdoc-ui/doctest/failed-doctest-extra-semicolon-on-item.rs
@@ -3,7 +3,7 @@
 
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 
 /// <https://github.com/rust-lang/rust/issues/91014>
diff --git a/tests/rustdoc-ui/doctest/failed-doctest-missing-codes.rs b/tests/rustdoc-ui/doctest/failed-doctest-missing-codes.rs
index 70db072f72667..766d948614375 100644
--- a/tests/rustdoc-ui/doctest/failed-doctest-missing-codes.rs
+++ b/tests/rustdoc-ui/doctest/failed-doctest-missing-codes.rs
@@ -3,7 +3,7 @@
 
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 
 /// ```compile_fail,E0004
diff --git a/tests/rustdoc-ui/doctest/failed-doctest-output-windows.rs b/tests/rustdoc-ui/doctest/failed-doctest-output-windows.rs
index 5e1ecf82f5821..cf0d8b9daa1cc 100644
--- a/tests/rustdoc-ui/doctest/failed-doctest-output-windows.rs
+++ b/tests/rustdoc-ui/doctest/failed-doctest-output-windows.rs
@@ -8,7 +8,7 @@
 //@ compile-flags:--test --test-args --test-threads=1
 //@ rustc-env:RUST_BACKTRACE=0
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 
 // doctest fails at runtime
diff --git a/tests/rustdoc-ui/doctest/failed-doctest-output.rs b/tests/rustdoc-ui/doctest/failed-doctest-output.rs
index d4d49b73793e6..160796065f333 100644
--- a/tests/rustdoc-ui/doctest/failed-doctest-output.rs
+++ b/tests/rustdoc-ui/doctest/failed-doctest-output.rs
@@ -8,7 +8,7 @@
 //@ compile-flags:--test --test-args --test-threads=1
 //@ rustc-env:RUST_BACKTRACE=0
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 
 // doctest fails at runtime
diff --git a/tests/rustdoc-ui/doctest/failed-doctest-should-panic.rs b/tests/rustdoc-ui/doctest/failed-doctest-should-panic.rs
index 6426fd353a7f7..b24687993e5dc 100644
--- a/tests/rustdoc-ui/doctest/failed-doctest-should-panic.rs
+++ b/tests/rustdoc-ui/doctest/failed-doctest-should-panic.rs
@@ -3,7 +3,7 @@
 
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 
 /// ```should_panic
diff --git a/tests/rustdoc-ui/doctest/no-run-flag.rs b/tests/rustdoc-ui/doctest/no-run-flag.rs
index bdb977b5504d4..0f7a0a175f124 100644
--- a/tests/rustdoc-ui/doctest/no-run-flag.rs
+++ b/tests/rustdoc-ui/doctest/no-run-flag.rs
@@ -3,7 +3,7 @@
 //@ check-pass
 //@ compile-flags:-Z unstable-options --test --no-run --test-args=--test-threads=1
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 /// ```
 /// let a = true;
diff --git a/tests/rustdoc-ui/doctest/nocapture-fail.rs b/tests/rustdoc-ui/doctest/nocapture-fail.rs
index 9c225174270c8..db4062e849410 100644
--- a/tests/rustdoc-ui/doctest/nocapture-fail.rs
+++ b/tests/rustdoc-ui/doctest/nocapture-fail.rs
@@ -2,7 +2,7 @@
 //@ compile-flags:--test -Zunstable-options --nocapture
 //@ normalize-stderr-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 /// ```compile_fail
 /// fn foo() {
diff --git a/tests/rustdoc-ui/doctest/nocapture.rs b/tests/rustdoc-ui/doctest/nocapture.rs
index 39785286fb172..3b87dad49f953 100644
--- a/tests/rustdoc-ui/doctest/nocapture.rs
+++ b/tests/rustdoc-ui/doctest/nocapture.rs
@@ -1,7 +1,7 @@
 //@ check-pass
 //@ compile-flags:--test -Zunstable-options --nocapture
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 /// ```
 /// println!("hello!");
diff --git a/tests/rustdoc-ui/doctest/non-local-defs-impl.rs b/tests/rustdoc-ui/doctest/non-local-defs-impl.rs
index c984e097c0463..37c80bc1f2728 100644
--- a/tests/rustdoc-ui/doctest/non-local-defs-impl.rs
+++ b/tests/rustdoc-ui/doctest/non-local-defs-impl.rs
@@ -4,7 +4,7 @@
 //@ aux-build:pub_trait.rs
 //@ compile-flags: --test --test-args --test-threads=1
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 #![doc(test(attr(deny(non_local_definitions))))]
 #![doc(test(attr(allow(dead_code))))]
diff --git a/tests/rustdoc-ui/doctest/non_local_defs.rs b/tests/rustdoc-ui/doctest/non_local_defs.rs
index d8cfe5637ae02..83327eb1e3f49 100644
--- a/tests/rustdoc-ui/doctest/non_local_defs.rs
+++ b/tests/rustdoc-ui/doctest/non_local_defs.rs
@@ -2,7 +2,7 @@
 //@ compile-flags:--test --test-args --test-threads=1 --nocapture -Zunstable-options
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
 //@ normalize-stderr-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 #![doc(test(attr(warn(non_local_definitions))))]
 
diff --git a/tests/rustdoc-ui/doctest/run-directory.rs b/tests/rustdoc-ui/doctest/run-directory.rs
index 2fc18470133c7..0e3a30ba46141 100644
--- a/tests/rustdoc-ui/doctest/run-directory.rs
+++ b/tests/rustdoc-ui/doctest/run-directory.rs
@@ -5,7 +5,7 @@
 //@ [correct]compile-flags:--test --test-run-directory={{src-base}}
 //@ [incorrect]compile-flags:--test --test-run-directory={{src-base}}/coverage
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 /// ```
 /// assert_eq!(
diff --git a/tests/rustdoc-ui/doctest/test-no_std.rs b/tests/rustdoc-ui/doctest/test-no_std.rs
index 897927f41569b..b8af892552dec 100644
--- a/tests/rustdoc-ui/doctest/test-no_std.rs
+++ b/tests/rustdoc-ui/doctest/test-no_std.rs
@@ -1,6 +1,6 @@
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ check-pass
 
 #![no_std]
diff --git a/tests/rustdoc-ui/doctest/test-type.rs b/tests/rustdoc-ui/doctest/test-type.rs
index d18143368e86a..846a98a853b56 100644
--- a/tests/rustdoc-ui/doctest/test-type.rs
+++ b/tests/rustdoc-ui/doctest/test-type.rs
@@ -1,7 +1,7 @@
 //@ compile-flags: --test --test-args=--test-threads=1
 //@ check-pass
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 /// ```
 /// let a = true;
diff --git a/tests/rustdoc-ui/doctest/unparseable-doc-test.rs b/tests/rustdoc-ui/doctest/unparseable-doc-test.rs
index e96e3b9cd3583..43acfa6de3f95 100644
--- a/tests/rustdoc-ui/doctest/unparseable-doc-test.rs
+++ b/tests/rustdoc-ui/doctest/unparseable-doc-test.rs
@@ -1,6 +1,6 @@
 //@ compile-flags: --test
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 //@ rustc-env: RUST_BACKTRACE=0
 
diff --git a/tests/rustdoc-ui/ice-bug-report-url.rs b/tests/rustdoc-ui/ice-bug-report-url.rs
index 7c289b7c0cb6d..f270340e07e8f 100644
--- a/tests/rustdoc-ui/ice-bug-report-url.rs
+++ b/tests/rustdoc-ui/ice-bug-report-url.rs
@@ -4,12 +4,12 @@
 //@ error-pattern: aborting due to
 //@ error-pattern: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-rustdoc&template=ice.md
 
-//@ normalize-stderr-test "note: compiler flags.*\n\n" -> ""
-//@ normalize-stderr-test "note: rustc.*running on.*" -> "note: rustc {version} running on {platform}"
-//@ normalize-stderr-test "thread.*panicked at compiler.*" -> ""
-//@ normalize-stderr-test " +\d{1,}: .*\n" -> ""
-//@ normalize-stderr-test " + at .*\n" -> ""
-//@ normalize-stderr-test ".*note: Some details are omitted.*\n" -> ""
+//@ normalize-stderr-test: "note: compiler flags.*\n\n" -> ""
+//@ normalize-stderr-test: "note: rustc.*running on.*" -> "note: rustc {version} running on {platform}"
+//@ normalize-stderr-test: "thread.*panicked at compiler.*" -> ""
+//@ normalize-stderr-test: " +\d{1,}: .*\n" -> ""
+//@ normalize-stderr-test: " + at .*\n" -> ""
+//@ normalize-stderr-test: ".*note: Some details are omitted.*\n" -> ""
 
 fn wrong()
 //~^ ERROR expected one of
diff --git a/tests/rustdoc-ui/issues/issue-80992.rs b/tests/rustdoc-ui/issues/issue-80992.rs
index 4e112fc925136..31cc8b78ecc4a 100644
--- a/tests/rustdoc-ui/issues/issue-80992.rs
+++ b/tests/rustdoc-ui/issues/issue-80992.rs
@@ -1,7 +1,7 @@
 //@ check-pass
 //@ compile-flags:--test
 //@ normalize-stdout-test: "tests/rustdoc-ui/issues" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 pub fn test() -> Result<(), ()> {
     //! ```compile_fail
diff --git a/tests/rustdoc-ui/issues/issue-81662-shortness.rs b/tests/rustdoc-ui/issues/issue-81662-shortness.rs
index 736ca3c5bad2f..02207d2a736d7 100644
--- a/tests/rustdoc-ui/issues/issue-81662-shortness.rs
+++ b/tests/rustdoc-ui/issues/issue-81662-shortness.rs
@@ -2,7 +2,7 @@
 //@ check-stdout
 //@ error-pattern:cannot find function `foo` in this scope
 //@ normalize-stdout-test: "tests/rustdoc-ui/issues" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
 
 /// ```rust
diff --git a/tests/rustdoc-ui/issues/issue-91134.rs b/tests/rustdoc-ui/issues/issue-91134.rs
index b80d6539ebe9a..6b1fec957eacf 100644
--- a/tests/rustdoc-ui/issues/issue-91134.rs
+++ b/tests/rustdoc-ui/issues/issue-91134.rs
@@ -2,7 +2,7 @@
 //@ aux-build:empty-fn.rs
 //@ check-pass
 //@ normalize-stdout-test: "tests/rustdoc-ui/issues" -> "$$DIR"
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ edition:2021
 
 /// <https://github.com/rust-lang/rust/issues/91134>
diff --git a/tests/rustdoc-ui/remap-path-prefix-failed-doctest-output.rs b/tests/rustdoc-ui/remap-path-prefix-failed-doctest-output.rs
index 2b220370d77aa..57c0c1af031b2 100644
--- a/tests/rustdoc-ui/remap-path-prefix-failed-doctest-output.rs
+++ b/tests/rustdoc-ui/remap-path-prefix-failed-doctest-output.rs
@@ -4,8 +4,8 @@
 //@ failure-status: 101
 //@ compile-flags:--test -Z unstable-options --remap-path-prefix={{src-base}}=remapped_path --test-args --test-threads=1
 //@ rustc-env:RUST_BACKTRACE=0
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
-//@ normalize-stdout-test "exit (status|code): 101" -> "exit status: 101"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "exit (status|code): 101" -> "exit status: 101"
 
 // doctest fails at runtime
 /// ```
diff --git a/tests/rustdoc-ui/remap-path-prefix-invalid-doctest.rs b/tests/rustdoc-ui/remap-path-prefix-invalid-doctest.rs
index 2e023e32d7a7b..96a79e85f6be5 100644
--- a/tests/rustdoc-ui/remap-path-prefix-invalid-doctest.rs
+++ b/tests/rustdoc-ui/remap-path-prefix-invalid-doctest.rs
@@ -4,7 +4,7 @@
 //@ failure-status: 101
 //@ compile-flags:--test -Z unstable-options --remap-path-prefix={{src-base}}=remapped_path --test-args --test-threads=1
 //@ rustc-env:RUST_BACKTRACE=0
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 // doctest fails to compile
 /// ```
diff --git a/tests/rustdoc-ui/remap-path-prefix-passed-doctest-output.rs b/tests/rustdoc-ui/remap-path-prefix-passed-doctest-output.rs
index c58f3faeb5323..4c61c43578cdf 100644
--- a/tests/rustdoc-ui/remap-path-prefix-passed-doctest-output.rs
+++ b/tests/rustdoc-ui/remap-path-prefix-passed-doctest-output.rs
@@ -5,7 +5,7 @@
 // adapted to use that, and that normalize line can go away
 
 //@ compile-flags:--test -Z unstable-options --remap-path-prefix={{src-base}}=remapped_path --test-args --test-threads=1
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 // doctest passes at runtime
 /// ```
diff --git a/tests/rustdoc-ui/track-diagnostics.rs b/tests/rustdoc-ui/track-diagnostics.rs
index 75f2517a408a9..403b8c7891745 100644
--- a/tests/rustdoc-ui/track-diagnostics.rs
+++ b/tests/rustdoc-ui/track-diagnostics.rs
@@ -3,7 +3,7 @@
 
 // Normalize the emitted location so this doesn't need
 // updating everytime someone adds or removes a line.
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 
 struct A;
 struct B;
diff --git a/tests/rustdoc-ui/unable-fulfill-trait.rs b/tests/rustdoc-ui/unable-fulfill-trait.rs
index f3b6256346f0c..4edc7ab76c198 100644
--- a/tests/rustdoc-ui/unable-fulfill-trait.rs
+++ b/tests/rustdoc-ui/unable-fulfill-trait.rs
@@ -4,7 +4,6 @@ pub struct Foo<'a, 'b, T> {
     field1: dyn Bar<'a, 'b>,
     //~^ ERROR
     //~| ERROR
-    //~| ERROR
 }
 
 pub trait Bar<'x, 's, U>
diff --git a/tests/rustdoc-ui/unable-fulfill-trait.stderr b/tests/rustdoc-ui/unable-fulfill-trait.stderr
index 40d103f2a62e7..12e53546cdacc 100644
--- a/tests/rustdoc-ui/unable-fulfill-trait.stderr
+++ b/tests/rustdoc-ui/unable-fulfill-trait.stderr
@@ -5,7 +5,7 @@ LL |     field1: dyn Bar<'a, 'b>,
    |                 ^^^ expected 1 generic argument
    |
 note: trait defined here, with 1 generic parameter: `U`
-  --> $DIR/unable-fulfill-trait.rs:10:11
+  --> $DIR/unable-fulfill-trait.rs:9:11
    |
 LL | pub trait Bar<'x, 's, U>
    |           ^^^         -
@@ -20,24 +20,7 @@ error[E0227]: ambiguous lifetime bound, explicit lifetime bound required
 LL |     field1: dyn Bar<'a, 'b>,
    |             ^^^^^^^^^^^^^^^
 
-error[E0478]: lifetime bound not satisfied
-  --> $DIR/unable-fulfill-trait.rs:4:13
-   |
-LL |     field1: dyn Bar<'a, 'b>,
-   |             ^^^^^^^^^^^^^^^
-   |
-note: lifetime parameter instantiated with the lifetime `'b` as defined here
-  --> $DIR/unable-fulfill-trait.rs:3:20
-   |
-LL | pub struct Foo<'a, 'b, T> {
-   |                    ^^
-note: but lifetime parameter must outlive the lifetime `'a` as defined here
-  --> $DIR/unable-fulfill-trait.rs:3:16
-   |
-LL | pub struct Foo<'a, 'b, T> {
-   |                ^^
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0107, E0227, E0478.
+Some errors have detailed explanations: E0107, E0227.
 For more information about an error, try `rustc --explain E0107`.
diff --git a/tests/ui-fulldeps/fluent-messages/test.rs b/tests/ui-fulldeps/fluent-messages/test.rs
index 2cd22b99e8377..7bf1252ccf602 100644
--- a/tests/ui-fulldeps/fluent-messages/test.rs
+++ b/tests/ui-fulldeps/fluent-messages/test.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "could not open Fluent resource:.*" -> "could not open Fluent resource: os-specific message"
+//@ normalize-stderr-test: "could not open Fluent resource:.*" -> "could not open Fluent resource: os-specific message"
 
 #![feature(rustc_private)]
 #![crate_type = "lib"]
diff --git a/tests/ui-fulldeps/missing-rustc-driver-error.rs b/tests/ui-fulldeps/missing-rustc-driver-error.rs
index adc3e701cc0e4..23ca39363bcd2 100644
--- a/tests/ui-fulldeps/missing-rustc-driver-error.rs
+++ b/tests/ui-fulldeps/missing-rustc-driver-error.rs
@@ -1,7 +1,7 @@
 // Test that we get the following hint when trying to use a compiler crate without rustc_driver.
 //@ error-pattern: try adding `extern crate rustc_driver;` at the top level of this crate
 //@ compile-flags: --emit link
-//@ normalize-stderr-test ".*crate .* required.*\n\n" -> ""
+//@ normalize-stderr-test: ".*crate .* required.*\n\n" -> ""
 //@ normalize-stderr-test: "aborting due to [0-9]+" -> "aborting due to NUMBER"
 
 #![feature(rustc_private)]
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.rs b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.rs
index 432ede89826f9..7921ede23c573 100644
--- a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.rs
+++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.rs
@@ -1,7 +1,7 @@
 //@ check-fail
 // Tests that a doc comment will not preclude a field from being considered a diagnostic argument
-//@ normalize-stderr-test "the following other types implement trait `IntoDiagArg`:(?:.*\n){0,9}\s+and \d+ others" -> "normalized in stderr"
-//@ normalize-stderr-test "(COMPILER_DIR/.*\.rs):[0-9]+:[0-9]+" -> "$1:LL:CC"
+//@ normalize-stderr-test: "the following other types implement trait `IntoDiagArg`:(?:.*\n){0,9}\s+and \d+ others" -> "normalized in stderr"
+//@ normalize-stderr-test: "(COMPILER_DIR/.*\.rs):[0-9]+:[0-9]+" -> "$1:LL:CC"
 
 // The proc_macro2 crate handles spans differently when on beta/stable release rather than nightly,
 // changing the output of this test. Since Subdiagnostic is strictly internal to the compiler
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs
index 4f50837d5fe49..dc268dfc5caf7 100644
--- a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs
+++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.rs
@@ -1,7 +1,7 @@
 //@ check-fail
 // Tests error conditions for specifying diagnostics using #[derive(Diagnostic)]
-//@ normalize-stderr-test "the following other types implement trait `IntoDiagArg`:(?:.*\n){0,9}\s+and \d+ others" -> "normalized in stderr"
-//@ normalize-stderr-test "(COMPILER_DIR/.*\.rs):[0-9]+:[0-9]+" -> "$1:LL:CC"
+//@ normalize-stderr-test: "the following other types implement trait `IntoDiagArg`:(?:.*\n){0,9}\s+and \d+ others" -> "normalized in stderr"
+//@ normalize-stderr-test: "(COMPILER_DIR/.*\.rs):[0-9]+:[0-9]+" -> "$1:LL:CC"
 
 // The proc_macro2 crate handles spans differently when on beta/stable release rather than nightly,
 // changing the output of this test. Since Diagnostic is strictly internal to the compiler
diff --git a/tests/ui/abi/debug.rs b/tests/ui/abi/debug.rs
index ceb88d4e9faa8..16d6160273415 100644
--- a/tests/ui/abi/debug.rs
+++ b/tests/ui/abi/debug.rs
@@ -1,9 +1,9 @@
-//@ normalize-stderr-test "(abi|pref|unadjusted_abi_align): Align\([1-8] bytes\)" -> "$1: $$SOME_ALIGN"
-//@ normalize-stderr-test "(size): Size\([48] bytes\)" -> "$1: $$SOME_SIZE"
-//@ normalize-stderr-test "(can_unwind): (true|false)" -> "$1: $$SOME_BOOL"
-//@ normalize-stderr-test "(valid_range): 0\.\.=(4294967295|18446744073709551615)" -> "$1: $$FULL"
+//@ normalize-stderr-test: "(abi|pref|unadjusted_abi_align): Align\([1-8] bytes\)" -> "$1: $$SOME_ALIGN"
+//@ normalize-stderr-test: "(size): Size\([48] bytes\)" -> "$1: $$SOME_SIZE"
+//@ normalize-stderr-test: "(can_unwind): (true|false)" -> "$1: $$SOME_BOOL"
+//@ normalize-stderr-test: "(valid_range): 0\.\.=(4294967295|18446744073709551615)" -> "$1: $$FULL"
 // This pattern is prepared for when we account for alignment in the niche.
-//@ normalize-stderr-test "(valid_range): [1-9]\.\.=(429496729[0-9]|1844674407370955161[0-9])" -> "$1: $$NON_NULL"
+//@ normalize-stderr-test: "(valid_range): [1-9]\.\.=(429496729[0-9]|1844674407370955161[0-9])" -> "$1: $$NON_NULL"
 // Some attributes are only computed for release builds:
 //@ compile-flags: -O
 #![feature(rustc_attrs)]
diff --git a/tests/ui/abi/removed-wasm-abi.rs b/tests/ui/abi/removed-wasm-abi.rs
new file mode 100644
index 0000000000000..a45e42bfe020e
--- /dev/null
+++ b/tests/ui/abi/removed-wasm-abi.rs
@@ -0,0 +1,4 @@
+extern "wasm" fn test() {}
+//~^ ERROR invalid ABI: found `wasm`
+
+fn main() {}
diff --git a/tests/ui/abi/removed-wasm-abi.stderr b/tests/ui/abi/removed-wasm-abi.stderr
new file mode 100644
index 0000000000000..6007c4e258014
--- /dev/null
+++ b/tests/ui/abi/removed-wasm-abi.stderr
@@ -0,0 +1,12 @@
+error[E0703]: invalid ABI: found `wasm`
+  --> $DIR/removed-wasm-abi.rs:1:8
+   |
+LL | extern "wasm" fn test() {}
+   |        ^^^^^^ invalid ABI
+   |
+   = note: invoke `rustc --print=calling-conventions` for a full list of supported calling conventions
+   = note: non-standard wasm ABI is no longer supported
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0703`.
diff --git a/tests/ui/abi/unsupported.aarch64.stderr b/tests/ui/abi/unsupported.aarch64.stderr
index 72a9519e3e772..123e76632574a 100644
--- a/tests/ui/abi/unsupported.aarch64.stderr
+++ b/tests/ui/abi/unsupported.aarch64.stderr
@@ -1,53 +1,47 @@
 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:29:1
+  --> $DIR/unsupported.rs:28:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:31:1
-   |
-LL | extern "wasm" fn wasm() {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^
-
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:33:1
+  --> $DIR/unsupported.rs:30:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:39:1
+  --> $DIR/unsupported.rs:36:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:41:1
+  --> $DIR/unsupported.rs:38:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"riscv-interrupt-m"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:43:1
+  --> $DIR/unsupported.rs:40:1
    |
 LL | extern "riscv-interrupt-m" fn riscv() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"x86-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:48:1
+  --> $DIR/unsupported.rs:45:1
    |
 LL | extern "x86-interrupt" fn x86() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:53:1
+  --> $DIR/unsupported.rs:50:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:59:1
+  --> $DIR/unsupported.rs:56:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -56,6 +50,6 @@ LL | extern "stdcall" fn stdcall() {}
    = note: for more information, see issue #87678 <https://github.com/rust-lang/rust/issues/87678>
    = note: `#[warn(unsupported_calling_conventions)]` on by default
 
-error: aborting due to 8 previous errors; 1 warning emitted
+error: aborting due to 7 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0570`.
diff --git a/tests/ui/abi/unsupported.arm.stderr b/tests/ui/abi/unsupported.arm.stderr
index 473b59a334df3..7376bb17d6b95 100644
--- a/tests/ui/abi/unsupported.arm.stderr
+++ b/tests/ui/abi/unsupported.arm.stderr
@@ -1,47 +1,41 @@
 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:29:1
+  --> $DIR/unsupported.rs:28:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:31:1
-   |
-LL | extern "wasm" fn wasm() {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^
-
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:39:1
+  --> $DIR/unsupported.rs:36:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:41:1
+  --> $DIR/unsupported.rs:38:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"riscv-interrupt-m"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:43:1
+  --> $DIR/unsupported.rs:40:1
    |
 LL | extern "riscv-interrupt-m" fn riscv() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"x86-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:48:1
+  --> $DIR/unsupported.rs:45:1
    |
 LL | extern "x86-interrupt" fn x86() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:53:1
+  --> $DIR/unsupported.rs:50:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:59:1
+  --> $DIR/unsupported.rs:56:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,6 +44,6 @@ LL | extern "stdcall" fn stdcall() {}
    = note: for more information, see issue #87678 <https://github.com/rust-lang/rust/issues/87678>
    = note: `#[warn(unsupported_calling_conventions)]` on by default
 
-error: aborting due to 7 previous errors; 1 warning emitted
+error: aborting due to 6 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0570`.
diff --git a/tests/ui/abi/unsupported.i686.stderr b/tests/ui/abi/unsupported.i686.stderr
index f0af3d251e245..23b0e581887f4 100644
--- a/tests/ui/abi/unsupported.i686.stderr
+++ b/tests/ui/abi/unsupported.i686.stderr
@@ -1,39 +1,33 @@
 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:29:1
+  --> $DIR/unsupported.rs:28:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:31:1
-   |
-LL | extern "wasm" fn wasm() {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^
-
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:33:1
+  --> $DIR/unsupported.rs:30:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:39:1
+  --> $DIR/unsupported.rs:36:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:41:1
+  --> $DIR/unsupported.rs:38:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"riscv-interrupt-m"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:43:1
+  --> $DIR/unsupported.rs:40:1
    |
 LL | extern "riscv-interrupt-m" fn riscv() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 6 previous errors
+error: aborting due to 5 previous errors
 
 For more information about this error, try `rustc --explain E0570`.
diff --git a/tests/ui/abi/unsupported.riscv32.stderr b/tests/ui/abi/unsupported.riscv32.stderr
index b466a2a6ff86b..708fd2c92a998 100644
--- a/tests/ui/abi/unsupported.riscv32.stderr
+++ b/tests/ui/abi/unsupported.riscv32.stderr
@@ -1,47 +1,41 @@
 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:29:1
+  --> $DIR/unsupported.rs:28:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:31:1
-   |
-LL | extern "wasm" fn wasm() {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^
-
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:33:1
+  --> $DIR/unsupported.rs:30:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:39:1
+  --> $DIR/unsupported.rs:36:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:41:1
+  --> $DIR/unsupported.rs:38:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"x86-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:48:1
+  --> $DIR/unsupported.rs:45:1
    |
 LL | extern "x86-interrupt" fn x86() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:53:1
+  --> $DIR/unsupported.rs:50:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:59:1
+  --> $DIR/unsupported.rs:56:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,6 +44,6 @@ LL | extern "stdcall" fn stdcall() {}
    = note: for more information, see issue #87678 <https://github.com/rust-lang/rust/issues/87678>
    = note: `#[warn(unsupported_calling_conventions)]` on by default
 
-error: aborting due to 7 previous errors; 1 warning emitted
+error: aborting due to 6 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0570`.
diff --git a/tests/ui/abi/unsupported.riscv64.stderr b/tests/ui/abi/unsupported.riscv64.stderr
index b466a2a6ff86b..708fd2c92a998 100644
--- a/tests/ui/abi/unsupported.riscv64.stderr
+++ b/tests/ui/abi/unsupported.riscv64.stderr
@@ -1,47 +1,41 @@
 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:29:1
+  --> $DIR/unsupported.rs:28:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:31:1
-   |
-LL | extern "wasm" fn wasm() {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^
-
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:33:1
+  --> $DIR/unsupported.rs:30:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:39:1
+  --> $DIR/unsupported.rs:36:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:41:1
+  --> $DIR/unsupported.rs:38:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"x86-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:48:1
+  --> $DIR/unsupported.rs:45:1
    |
 LL | extern "x86-interrupt" fn x86() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:53:1
+  --> $DIR/unsupported.rs:50:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:59:1
+  --> $DIR/unsupported.rs:56:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,6 +44,6 @@ LL | extern "stdcall" fn stdcall() {}
    = note: for more information, see issue #87678 <https://github.com/rust-lang/rust/issues/87678>
    = note: `#[warn(unsupported_calling_conventions)]` on by default
 
-error: aborting due to 7 previous errors; 1 warning emitted
+error: aborting due to 6 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0570`.
diff --git a/tests/ui/abi/unsupported.rs b/tests/ui/abi/unsupported.rs
index cd7e76c7158f4..c12883e3fce21 100644
--- a/tests/ui/abi/unsupported.rs
+++ b/tests/ui/abi/unsupported.rs
@@ -19,7 +19,6 @@
     abi_ptx,
     abi_msp430_interrupt,
     abi_avr_interrupt,
-    wasm_abi,
     abi_x86_interrupt,
     abi_riscv_interrupt
 )]
@@ -28,8 +27,6 @@ trait Sized {}
 
 extern "ptx-kernel" fn ptx() {}
 //~^ ERROR is not a supported ABI
-extern "wasm" fn wasm() {}
-//~^ ERROR is not a supported ABI
 extern "aapcs" fn aapcs() {}
 //[x64]~^ ERROR is not a supported ABI
 //[i686]~^^ ERROR is not a supported ABI
diff --git a/tests/ui/abi/unsupported.x64.stderr b/tests/ui/abi/unsupported.x64.stderr
index 4a2b7e7496920..7b918a948d3ba 100644
--- a/tests/ui/abi/unsupported.x64.stderr
+++ b/tests/ui/abi/unsupported.x64.stderr
@@ -1,47 +1,41 @@
 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:29:1
+  --> $DIR/unsupported.rs:28:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:31:1
-   |
-LL | extern "wasm" fn wasm() {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^
-
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:33:1
+  --> $DIR/unsupported.rs:30:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:39:1
+  --> $DIR/unsupported.rs:36:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:41:1
+  --> $DIR/unsupported.rs:38:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"riscv-interrupt-m"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:43:1
+  --> $DIR/unsupported.rs:40:1
    |
 LL | extern "riscv-interrupt-m" fn riscv() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:53:1
+  --> $DIR/unsupported.rs:50:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:59:1
+  --> $DIR/unsupported.rs:56:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,6 +44,6 @@ LL | extern "stdcall" fn stdcall() {}
    = note: for more information, see issue #87678 <https://github.com/rust-lang/rust/issues/87678>
    = note: `#[warn(unsupported_calling_conventions)]` on by default
 
-error: aborting due to 7 previous errors; 1 warning emitted
+error: aborting due to 6 previous errors; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0570`.
diff --git a/tests/ui/asm/aarch64/parse-error.stderr b/tests/ui/asm/aarch64/parse-error.stderr
index 539c134472fda..d21a8ab1f85fd 100644
--- a/tests/ui/asm/aarch64/parse-error.stderr
+++ b/tests/ui/asm/aarch64/parse-error.stderr
@@ -313,74 +313,90 @@ LL | global_asm!("{1}", format!("{{{}}}", 0), const FOO, const BAR);
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:39:37
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{}", options(), const foo);
    |                                     ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:47:44
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{}", clobber_abi("C"), const foo);
    |                                            ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:50:55
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{}", options(), clobber_abi("C"), const foo);
    |                                                       ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:52:31
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{a}", a = const foo, a = const bar);
    |                               ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:52:46
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{a}", a = const foo, a = const bar);
    |                                              ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:59:45
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{a}", in("x0") foo, a = const bar);
    |                                             ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:61:45
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{a}", in("x0") foo, a = const bar);
    |                                             ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:63:41
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{1}", in("x0") foo, const bar);
    |                                         ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error: aborting due to 57 previous errors
 
diff --git a/tests/ui/asm/parse-error.stderr b/tests/ui/asm/parse-error.stderr
index 80ee5191dbbe9..1999cd09aa3b5 100644
--- a/tests/ui/asm/parse-error.stderr
+++ b/tests/ui/asm/parse-error.stderr
@@ -371,47 +371,57 @@ LL | global_asm!("{}", label {});
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:39:37
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{}", options(), const foo);
    |                                     ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:71:44
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{}", clobber_abi("C"), const foo);
    |                                            ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:74:55
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{}", options(), clobber_abi("C"), const foo);
    |                                                       ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:76:31
    |
-LL |     let mut foo = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         asm!("{a}", a = const foo, a = const bar);
    |                               ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/parse-error.rs:76:46
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{a}", a = const foo, a = const bar);
    |                                              ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error: aborting due to 64 previous errors
 
diff --git a/tests/ui/asm/type-check-1.stderr b/tests/ui/asm/type-check-1.stderr
index 07a609c52139e..1852623211813 100644
--- a/tests/ui/asm/type-check-1.stderr
+++ b/tests/ui/asm/type-check-1.stderr
@@ -1,29 +1,35 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/type-check-1.rs:41:26
    |
-LL |         let x = 0;
-   |         ----- help: consider using `const` instead of `let`: `const x`
-...
 LL |         asm!("{}", const x);
    |                          ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |         const x: /* Type */ = 0;
+   |         ~~~~~  ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/type-check-1.rs:44:36
    |
-LL |         let x = 0;
-   |         ----- help: consider using `const` instead of `let`: `const x`
-...
 LL |         asm!("{}", const const_foo(x));
    |                                    ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |         const x: /* Type */ = 0;
+   |         ~~~~~  ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/type-check-1.rs:47:36
    |
-LL |         let x = 0;
-   |         ----- help: consider using `const` instead of `let`: `const x`
-...
 LL |         asm!("{}", const const_bar(x));
    |                                    ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |         const x: /* Type */ = 0;
+   |         ~~~~~  ++++++++++++
 
 error: invalid `sym` operand
   --> $DIR/type-check-1.rs:49:24
diff --git a/tests/ui/asm/x86_64/x86_64_parse_error.stderr b/tests/ui/asm/x86_64/x86_64_parse_error.stderr
index f2854ae512851..9751f7b09d0eb 100644
--- a/tests/ui/asm/x86_64/x86_64_parse_error.stderr
+++ b/tests/ui/asm/x86_64/x86_64_parse_error.stderr
@@ -15,29 +15,35 @@ LL |         asm!("{1}", in("eax") foo, const bar);
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/x86_64_parse_error.rs:13:46
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{a}", in("eax") foo, a = const bar);
    |                                              ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/x86_64_parse_error.rs:15:46
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{a}", in("eax") foo, a = const bar);
    |                                              ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/x86_64_parse_error.rs:17:42
    |
-LL |     let mut bar = 0;
-   |     ----------- help: consider using `const` instead of `let`: `const bar`
-...
 LL |         asm!("{1}", in("eax") foo, const bar);
    |                                          ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const bar: /* Type */ = 0;
+   |     ~~~~~    ++++++++++++
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/associated-types/associated-types-eq-expr-path.rs b/tests/ui/associated-types/associated-types-eq-expr-path.rs
index 67831f913039a..3179811274e81 100644
--- a/tests/ui/associated-types/associated-types-eq-expr-path.rs
+++ b/tests/ui/associated-types/associated-types-eq-expr-path.rs
@@ -7,11 +7,12 @@ trait Foo {
 
 impl Foo for isize {
     type A = usize;
-    fn bar() -> isize { 42 }
+    fn bar() -> isize {
+        42
+    }
 }
 
 pub fn main() {
     let x: isize = Foo::<A = usize>::bar();
     //~^ ERROR associated item constraints are not allowed here
-    //~| ERROR cannot call
 }
diff --git a/tests/ui/associated-types/associated-types-eq-expr-path.stderr b/tests/ui/associated-types/associated-types-eq-expr-path.stderr
index 4f28b3cb2de33..bbe021fbc55f0 100644
--- a/tests/ui/associated-types/associated-types-eq-expr-path.stderr
+++ b/tests/ui/associated-types/associated-types-eq-expr-path.stderr
@@ -1,25 +1,9 @@
 error[E0229]: associated item constraints are not allowed here
-  --> $DIR/associated-types-eq-expr-path.rs:14:26
+  --> $DIR/associated-types-eq-expr-path.rs:16:26
    |
 LL |     let x: isize = Foo::<A = usize>::bar();
    |                          ^^^^^^^^^ associated item constraint not allowed here
 
-error[E0790]: cannot call associated function on trait without specifying the corresponding `impl` type
-  --> $DIR/associated-types-eq-expr-path.rs:14:20
-   |
-LL |     fn bar() -> isize;
-   |     ------------------ `Foo::bar` defined here
-...
-LL |     let x: isize = Foo::<A = usize>::bar();
-   |                    ^^^^^^^^^^^^^^^^^^^^^^^ cannot call associated function of trait
-   |
-help: use the fully-qualified path to the only available implementation
-   |
-LL -     let x: isize = Foo::<A = usize>::bar();
-LL +     let x: isize = <isize as Foo<A = usize>>::bar();
-   |
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0229, E0790.
-For more information about an error, try `rustc --explain E0229`.
+For more information about this error, try `rustc --explain E0229`.
diff --git a/tests/ui/async-await/async-closures/lint-closure-returning-async-block.rs b/tests/ui/async-await/async-closures/lint-closure-returning-async-block.rs
new file mode 100644
index 0000000000000..3e2ab8321a890
--- /dev/null
+++ b/tests/ui/async-await/async-closures/lint-closure-returning-async-block.rs
@@ -0,0 +1,21 @@
+//@ edition: 2021
+
+#![feature(async_closure)]
+#![deny(closure_returning_async_block)]
+
+fn main() {
+    let x = || async {};
+    //~^ ERROR closure returning async block can be made into an async closure
+
+    let x = || async move {};
+    //~^ ERROR closure returning async block can be made into an async closure
+
+    let x = move || async move {};
+    //~^ ERROR closure returning async block can be made into an async closure
+
+    let x = move || async {};
+    //~^ ERROR closure returning async block can be made into an async closure
+
+    let x = || {{ async {} }};
+    //~^ ERROR closure returning async block can be made into an async closure
+}
diff --git a/tests/ui/async-await/async-closures/lint-closure-returning-async-block.stderr b/tests/ui/async-await/async-closures/lint-closure-returning-async-block.stderr
new file mode 100644
index 0000000000000..4c0c4d797d8ef
--- /dev/null
+++ b/tests/ui/async-await/async-closures/lint-closure-returning-async-block.stderr
@@ -0,0 +1,67 @@
+error: closure returning async block can be made into an async closure
+  --> $DIR/lint-closure-returning-async-block.rs:7:13
+   |
+LL |     let x = || async {};
+   |             ^^ ----- this async block can be removed, and the closure can be turned into an async closure
+   |
+note: the lint level is defined here
+  --> $DIR/lint-closure-returning-async-block.rs:4:9
+   |
+LL | #![deny(closure_returning_async_block)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+help: turn this into an async closure
+   |
+LL -     let x = || async {};
+LL +     let x = async || {};
+   |
+
+error: closure returning async block can be made into an async closure
+  --> $DIR/lint-closure-returning-async-block.rs:10:13
+   |
+LL |     let x = || async move {};
+   |             ^^ ---------- this async block can be removed, and the closure can be turned into an async closure
+   |
+help: turn this into an async closure
+   |
+LL -     let x = || async move {};
+LL +     let x = async || {};
+   |
+
+error: closure returning async block can be made into an async closure
+  --> $DIR/lint-closure-returning-async-block.rs:13:13
+   |
+LL |     let x = move || async move {};
+   |             ^^^^^^^ ---------- this async block can be removed, and the closure can be turned into an async closure
+   |
+help: turn this into an async closure
+   |
+LL -     let x = move || async move {};
+LL +     let x = async move || {};
+   |
+
+error: closure returning async block can be made into an async closure
+  --> $DIR/lint-closure-returning-async-block.rs:16:13
+   |
+LL |     let x = move || async {};
+   |             ^^^^^^^ ----- this async block can be removed, and the closure can be turned into an async closure
+   |
+help: turn this into an async closure
+   |
+LL -     let x = move || async {};
+LL +     let x = async move || {};
+   |
+
+error: closure returning async block can be made into an async closure
+  --> $DIR/lint-closure-returning-async-block.rs:19:13
+   |
+LL |     let x = || {{ async {} }};
+   |             ^^    ----- this async block can be removed, and the closure can be turned into an async closure
+   |
+help: turn this into an async closure
+   |
+LL -     let x = || {{ async {} }};
+LL +     let x = async || {{ {} }};
+   |
+
+error: aborting due to 5 previous errors
+
diff --git a/tests/ui/async-await/async-closures/signature-inference-from-two-part-bound.rs b/tests/ui/async-await/async-closures/signature-inference-from-two-part-bound.rs
new file mode 100644
index 0000000000000..0e2d1ef12082b
--- /dev/null
+++ b/tests/ui/async-await/async-closures/signature-inference-from-two-part-bound.rs
@@ -0,0 +1,27 @@
+//@ edition: 2021
+//@ check-pass
+//@ revisions: current next
+//@ ignore-compare-mode-next-solver (explicit revisions)
+//@[next] compile-flags: -Znext-solver
+
+#![feature(async_closure)]
+
+use std::future::Future;
+use std::any::Any;
+
+struct Struct;
+impl Struct {
+    fn method(&self) {}
+}
+
+fn fake_async_closure<F, Fut>(_: F)
+where
+    F: Fn(Struct) -> Fut,
+    Fut: Future<Output = ()>,
+{}
+
+fn main() {
+    fake_async_closure(async |s| {
+        s.method();
+    })
+}
diff --git a/tests/ui/attributes/dump-preds.rs b/tests/ui/attributes/dump-preds.rs
index 1e15ff2f9bdb3..ca38e23b237cf 100644
--- a/tests/ui/attributes/dump-preds.rs
+++ b/tests/ui/attributes/dump-preds.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "DefId\(.+?\)" -> "DefId(..)"
+//@ normalize-stderr-test: "DefId\(.+?\)" -> "DefId(..)"
 
 #![feature(rustc_attrs)]
 
diff --git a/tests/ui/attributes/dump_def_parents.rs b/tests/ui/attributes/dump_def_parents.rs
index af1c210d2cd18..de0c88bb6c39a 100644
--- a/tests/ui/attributes/dump_def_parents.rs
+++ b/tests/ui/attributes/dump_def_parents.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "DefId\(.+?\)" -> "DefId(..)"
+//@ normalize-stderr-test: "DefId\(.+?\)" -> "DefId(..)"
 #![feature(rustc_attrs)]
 
 fn bar() {
diff --git a/tests/ui/cast/cast-rfc0401-vtable-kinds.rs b/tests/ui/cast/cast-rfc0401-vtable-kinds.rs
index 0d8f92f013fba..5704a33cc870b 100644
--- a/tests/ui/cast/cast-rfc0401-vtable-kinds.rs
+++ b/tests/ui/cast/cast-rfc0401-vtable-kinds.rs
@@ -4,25 +4,12 @@
 
 #![feature(unsized_tuple_coercion)]
 
-trait Foo<T> {
-    fn foo(&self, _: T) -> u32 { 42 }
-}
-
 trait Bar { //~ WARN trait `Bar` is never used
     fn bar(&self) { println!("Bar!"); }
 }
 
-impl<T> Foo<T> for () {}
-impl Foo<u32> for u32 { fn foo(&self, _: u32) -> u32 { self+43 } }
 impl Bar for () {}
 
-unsafe fn round_trip_and_call<'a>(t: *const (dyn Foo<u32>+'a)) -> u32 {
-    let foo_e : *const dyn Foo<u32> = t as *const _;
-    let r_1 = foo_e as *mut dyn Foo<u32>;
-
-    (&*r_1).foo(0)
-}
-
 #[repr(C)]
 struct FooS<T:?Sized>(T);
 #[repr(C)]
@@ -38,11 +25,6 @@ fn tuple_i32_to_u32<T:?Sized>(u: *const (i32, T)) -> *const (u32, T) {
 
 
 fn main() {
-    let x = 4u32;
-    let y : &dyn Foo<u32> = &x;
-    let fl = unsafe { round_trip_and_call(y as *const dyn Foo<u32>) };
-    assert_eq!(fl, (43+4));
-
     let s = FooS([0,1,2]);
     let u: &FooS<[u32]> = &s;
     let u: *const FooS<[u32]> = u;
diff --git a/tests/ui/cast/cast-rfc0401-vtable-kinds.stderr b/tests/ui/cast/cast-rfc0401-vtable-kinds.stderr
index 952687e98d0ef..4f57e2e7df75e 100644
--- a/tests/ui/cast/cast-rfc0401-vtable-kinds.stderr
+++ b/tests/ui/cast/cast-rfc0401-vtable-kinds.stderr
@@ -1,5 +1,5 @@
 warning: trait `Bar` is never used
-  --> $DIR/cast-rfc0401-vtable-kinds.rs:11:7
+  --> $DIR/cast-rfc0401-vtable-kinds.rs:7:7
    |
 LL | trait Bar {
    |       ^^^
diff --git a/tests/ui/cast/ptr-to-trait-obj-add-auto.rs b/tests/ui/cast/ptr-to-trait-obj-add-auto.rs
new file mode 100644
index 0000000000000..46e72ea08779c
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-add-auto.rs
@@ -0,0 +1,18 @@
+//@ check-pass
+
+trait Trait<'a> {}
+
+fn add_auto<'a>(x: *mut dyn Trait<'a>) -> *mut (dyn Trait<'a> + Send) {
+    x as _
+    //~^ warning: adding an auto trait `Send` to a trait object in a pointer cast may cause UB later on
+    //~| warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+}
+
+// (to test diagnostic list formatting)
+fn add_multiple_auto<'a>(x: *mut dyn Trait<'a>) -> *mut (dyn Trait<'a> + Send + Sync + Unpin) {
+    x as _
+    //~^ warning: adding auto traits `Send`, `Sync`, and `Unpin` to a trait object in a pointer cast may cause UB later on
+    //~| warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+}
+
+fn main() {}
diff --git a/tests/ui/cast/ptr-to-trait-obj-add-auto.stderr b/tests/ui/cast/ptr-to-trait-obj-add-auto.stderr
new file mode 100644
index 0000000000000..e5ef8bf76b447
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-add-auto.stderr
@@ -0,0 +1,43 @@
+warning: adding an auto trait `Send` to a trait object in a pointer cast may cause UB later on
+  --> $DIR/ptr-to-trait-obj-add-auto.rs:6:5
+   |
+LL |     x as _
+   |     ^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>
+   = note: `#[warn(ptr_cast_add_auto_to_object)]` on by default
+
+warning: adding auto traits `Send`, `Sync`, and `Unpin` to a trait object in a pointer cast may cause UB later on
+  --> $DIR/ptr-to-trait-obj-add-auto.rs:13:5
+   |
+LL |     x as _
+   |     ^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>
+
+warning: 2 warnings emitted
+
+Future incompatibility report: Future breakage diagnostic:
+warning: adding an auto trait `Send` to a trait object in a pointer cast may cause UB later on
+  --> $DIR/ptr-to-trait-obj-add-auto.rs:6:5
+   |
+LL |     x as _
+   |     ^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>
+   = note: `#[warn(ptr_cast_add_auto_to_object)]` on by default
+
+Future breakage diagnostic:
+warning: adding auto traits `Send`, `Sync`, and `Unpin` to a trait object in a pointer cast may cause UB later on
+  --> $DIR/ptr-to-trait-obj-add-auto.rs:13:5
+   |
+LL |     x as _
+   |     ^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>
+   = note: `#[warn(ptr_cast_add_auto_to_object)]` on by default
+
diff --git a/tests/ui/cast/ptr-to-trait-obj-add-super-auto.rs b/tests/ui/cast/ptr-to-trait-obj-add-super-auto.rs
new file mode 100644
index 0000000000000..ac8108d8ec41b
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-add-super-auto.rs
@@ -0,0 +1,9 @@
+//@ check-pass
+
+trait Trait: Send {}
+impl Trait for () {}
+
+fn main() {
+    // This is OK: `Trait` has `Send` super trait.
+    &() as *const dyn Trait as *const (dyn Trait + Send);
+}
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-args.rs b/tests/ui/cast/ptr-to-trait-obj-different-args.rs
new file mode 100644
index 0000000000000..c6038cfe86401
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-args.rs
@@ -0,0 +1,37 @@
+//@ check-fail
+//
+// issue: <https://github.com/rust-lang/rust/issues/120222>
+
+trait A {}
+impl<T> A for T {}
+trait B {}
+impl<T> B for T {}
+
+trait Trait<G> {}
+struct X;
+impl<T> Trait<X> for T {}
+struct Y;
+impl<T> Trait<Y> for T {}
+
+fn main() {
+    let a: *const dyn A = &();
+    let b: *const dyn B = a as _; //~ error: casting `*const dyn A` as `*const dyn B` is invalid
+
+    let x: *const dyn Trait<X> = &();
+    let y: *const dyn Trait<Y> = x as _; //~ error: mismatched types
+
+    _ = (b, y);
+}
+
+fn generic<T>(x: *const dyn Trait<X>, t: *const dyn Trait<T>) {
+    let _: *const dyn Trait<T> = x as _; //~ error: mismatched types
+    let _: *const dyn Trait<X> = t as _; //~ error: mismatched types
+}
+
+trait Assocked {
+    type Assoc: ?Sized;
+}
+
+fn change_assoc(x: *mut dyn Assocked<Assoc = u8>) -> *mut dyn Assocked<Assoc = u32> {
+    x as _ //~ error: mismatched types
+}
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-args.stderr b/tests/ui/cast/ptr-to-trait-obj-different-args.stderr
new file mode 100644
index 0000000000000..b04289ae74748
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-args.stderr
@@ -0,0 +1,53 @@
+error[E0606]: casting `*const dyn A` as `*const dyn B` is invalid
+  --> $DIR/ptr-to-trait-obj-different-args.rs:18:27
+   |
+LL |     let b: *const dyn B = a as _;
+   |                           ^^^^^^
+   |
+   = note: vtable kinds may not match
+
+error[E0308]: mismatched types
+  --> $DIR/ptr-to-trait-obj-different-args.rs:21:34
+   |
+LL |     let y: *const dyn Trait<Y> = x as _;
+   |                                  ^^^^^^ expected `X`, found `Y`
+   |
+   = note: expected trait object `dyn Trait<X>`
+              found trait object `dyn Trait<Y>`
+
+error[E0308]: mismatched types
+  --> $DIR/ptr-to-trait-obj-different-args.rs:27:34
+   |
+LL | fn generic<T>(x: *const dyn Trait<X>, t: *const dyn Trait<T>) {
+   |            - found this type parameter
+LL |     let _: *const dyn Trait<T> = x as _;
+   |                                  ^^^^^^ expected `X`, found type parameter `T`
+   |
+   = note: expected trait object `dyn Trait<X>`
+              found trait object `dyn Trait<T>`
+
+error[E0308]: mismatched types
+  --> $DIR/ptr-to-trait-obj-different-args.rs:28:34
+   |
+LL | fn generic<T>(x: *const dyn Trait<X>, t: *const dyn Trait<T>) {
+   |            - expected this type parameter
+LL |     let _: *const dyn Trait<T> = x as _;
+LL |     let _: *const dyn Trait<X> = t as _;
+   |                                  ^^^^^^ expected type parameter `T`, found `X`
+   |
+   = note: expected trait object `dyn Trait<T>`
+              found trait object `dyn Trait<X>`
+
+error[E0308]: mismatched types
+  --> $DIR/ptr-to-trait-obj-different-args.rs:36:5
+   |
+LL |     x as _
+   |     ^^^^^^ expected `u8`, found `u32`
+   |
+   = note: expected trait object `dyn Assocked<Assoc = u8>`
+              found trait object `dyn Assocked<Assoc = u32>`
+
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0308, E0606.
+For more information about an error, try `rustc --explain E0308`.
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-regions-id-trait.rs b/tests/ui/cast/ptr-to-trait-obj-different-regions-id-trait.rs
new file mode 100644
index 0000000000000..cdd55e243927c
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-regions-id-trait.rs
@@ -0,0 +1,27 @@
+//@ check-fail
+//
+// Make sure we can't trick the compiler by using a projection.
+
+trait Cat<'a> {}
+impl Cat<'_> for () {}
+
+trait Id {
+    type Id: ?Sized;
+}
+impl<T: ?Sized> Id for T {
+    type Id = T;
+}
+
+struct S<T: ?Sized> {
+    tail: <T as Id>::Id,
+}
+
+fn m<'a>() {
+    let unsend: *const dyn Cat<'a> = &();
+    let _send = unsend as *const S<dyn Cat<'static>>;
+    //~^ error: lifetime may not live long enough
+}
+
+fn main() {
+    m();
+}
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-regions-id-trait.stderr b/tests/ui/cast/ptr-to-trait-obj-different-regions-id-trait.stderr
new file mode 100644
index 0000000000000..d1d598e603f18
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-regions-id-trait.stderr
@@ -0,0 +1,15 @@
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-id-trait.rs:21:17
+   |
+LL | fn m<'a>() {
+   |      -- lifetime `'a` defined here
+LL |     let unsend: *const dyn Cat<'a> = &();
+LL |     let _send = unsend as *const S<dyn Cat<'static>>;
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
+   |
+   = note: requirement occurs because of the type `S<dyn Cat<'_>>`, which makes the generic argument `dyn Cat<'_>` invariant
+   = note: the struct `S<T>` is invariant over the parameter `T`
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-regions-lt-ext.rs b/tests/ui/cast/ptr-to-trait-obj-different-regions-lt-ext.rs
new file mode 100644
index 0000000000000..96345de01c960
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-regions-lt-ext.rs
@@ -0,0 +1,31 @@
+//@ check-fail
+//
+// issue: <https://github.com/rust-lang/rust/issues/120217>
+
+#![feature(arbitrary_self_types)]
+
+trait Static<'a> {
+    fn proof(self: *const Self, s: &'a str) -> &'static str;
+}
+
+fn bad_cast<'a>(x: *const dyn Static<'static>) -> *const dyn Static<'a> {
+    x as _ //~ error: lifetime may not live long enough
+}
+
+impl Static<'static> for () {
+    fn proof(self: *const Self, s: &'static str) -> &'static str {
+        s
+    }
+}
+
+fn extend_lifetime(s: &str) -> &'static str {
+    bad_cast(&()).proof(s)
+}
+
+fn main() {
+    let s = String::from("Hello World");
+    let slice = extend_lifetime(&s);
+    println!("Now it exists: {slice}");
+    drop(s);
+    println!("Now it’s gone: {slice}");
+}
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-regions-lt-ext.stderr b/tests/ui/cast/ptr-to-trait-obj-different-regions-lt-ext.stderr
new file mode 100644
index 0000000000000..b7319e3356bd0
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-regions-lt-ext.stderr
@@ -0,0 +1,10 @@
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-lt-ext.rs:12:5
+   |
+LL | fn bad_cast<'a>(x: *const dyn Static<'static>) -> *const dyn Static<'a> {
+   |             -- lifetime `'a` defined here
+LL |     x as _
+   |     ^^^^^^ returning this value requires that `'a` must outlive `'static`
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-regions-misc.rs b/tests/ui/cast/ptr-to-trait-obj-different-regions-misc.rs
new file mode 100644
index 0000000000000..01c347bfae5a0
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-regions-misc.rs
@@ -0,0 +1,37 @@
+//@ check-fail
+
+trait Trait<'a> {}
+
+fn change_lt<'a, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
+    x as _ //~ error: lifetime may not live long enough
+           //~| error: lifetime may not live long enough
+}
+
+fn change_lt_ab<'a: 'b, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
+    x as _ //~ error: lifetime may not live long enough
+}
+
+fn change_lt_ba<'a, 'b: 'a>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
+    x as _ //~ error: lifetime may not live long enough
+}
+
+trait Assocked {
+    type Assoc: ?Sized;
+}
+
+fn change_assoc_0<'a, 'b>(
+    x: *mut dyn Assocked<Assoc = dyn Send + 'a>,
+) -> *mut dyn Assocked<Assoc = dyn Send + 'b> {
+    x as _ //~ error: lifetime may not live long enough
+           //~| error: lifetime may not live long enough
+}
+
+fn change_assoc_1<'a, 'b>(
+    x: *mut dyn Assocked<Assoc = dyn Trait<'a>>,
+) -> *mut dyn Assocked<Assoc = dyn Trait<'b>> {
+    x as _ //~ error: lifetime may not live long enough
+           //~| error: lifetime may not live long enough
+}
+
+
+fn main() {}
diff --git a/tests/ui/cast/ptr-to-trait-obj-different-regions-misc.stderr b/tests/ui/cast/ptr-to-trait-obj-different-regions-misc.stderr
new file mode 100644
index 0000000000000..7044e4dec1fe5
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-different-regions-misc.stderr
@@ -0,0 +1,136 @@
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:6:5
+   |
+LL | fn change_lt<'a, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
+   |              --  -- lifetime `'b` defined here
+   |              |
+   |              lifetime `'a` defined here
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b`
+   |
+   = help: consider adding the following bound: `'b: 'a`
+   = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:6:5
+   |
+LL | fn change_lt<'a, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
+   |              --  -- lifetime `'b` defined here
+   |              |
+   |              lifetime `'a` defined here
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
+   |
+   = help: consider adding the following bound: `'a: 'b`
+   = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+help: `'b` and `'a` must be the same: replace one with the other
+
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:11:5
+   |
+LL | fn change_lt_ab<'a: 'b, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
+   |                 --      -- lifetime `'b` defined here
+   |                 |
+   |                 lifetime `'a` defined here
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b`
+   |
+   = help: consider adding the following bound: `'b: 'a`
+   = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:15:5
+   |
+LL | fn change_lt_ba<'a, 'b: 'a>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
+   |                 --  -- lifetime `'b` defined here
+   |                 |
+   |                 lifetime `'a` defined here
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
+   |
+   = help: consider adding the following bound: `'a: 'b`
+   = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:25:5
+   |
+LL | fn change_assoc_0<'a, 'b>(
+   |                   --  -- lifetime `'b` defined here
+   |                   |
+   |                   lifetime `'a` defined here
+...
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b`
+   |
+   = help: consider adding the following bound: `'b: 'a`
+   = note: requirement occurs because of a mutable pointer to `dyn Assocked<Assoc = dyn Send>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:25:5
+   |
+LL | fn change_assoc_0<'a, 'b>(
+   |                   --  -- lifetime `'b` defined here
+   |                   |
+   |                   lifetime `'a` defined here
+...
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
+   |
+   = help: consider adding the following bound: `'a: 'b`
+   = note: requirement occurs because of a mutable pointer to `dyn Assocked<Assoc = dyn Send>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+help: `'b` and `'a` must be the same: replace one with the other
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:32:5
+   |
+LL | fn change_assoc_1<'a, 'b>(
+   |                   --  -- lifetime `'b` defined here
+   |                   |
+   |                   lifetime `'a` defined here
+...
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b`
+   |
+   = help: consider adding the following bound: `'b: 'a`
+   = note: requirement occurs because of a mutable pointer to `dyn Assocked<Assoc = dyn Trait<'_>>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+error: lifetime may not live long enough
+  --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:32:5
+   |
+LL | fn change_assoc_1<'a, 'b>(
+   |                   --  -- lifetime `'b` defined here
+   |                   |
+   |                   lifetime `'a` defined here
+...
+LL |     x as _
+   |     ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
+   |
+   = help: consider adding the following bound: `'a: 'b`
+   = note: requirement occurs because of a mutable pointer to `dyn Assocked<Assoc = dyn Trait<'_>>`
+   = note: mutable pointers are invariant over their type parameter
+   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
+
+help: `'b` and `'a` must be the same: replace one with the other
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: aborting due to 8 previous errors
+
diff --git a/tests/ui/cast/ptr-to-trait-obj-ok.rs b/tests/ui/cast/ptr-to-trait-obj-ok.rs
new file mode 100644
index 0000000000000..656c99c58dc9a
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-ok.rs
@@ -0,0 +1,17 @@
+//@ check-pass
+
+trait Trait<'a> {}
+
+fn remove_auto<'a>(x: *mut (dyn Trait<'a> + Send)) -> *mut dyn Trait<'a> {
+    x as _
+}
+
+fn cast_inherent_lt<'a, 'b>(x: *mut (dyn Trait<'static> + 'a)) -> *mut (dyn Trait<'static> + 'b) {
+    x as _
+}
+
+fn unprincipled<'a, 'b>(x: *mut (dyn Send + 'a)) -> *mut (dyn Sync + 'b) {
+    x as _
+}
+
+fn main() {}
diff --git a/tests/ui/cast/ptr-to-trait-obj-wrap-upcast.rs b/tests/ui/cast/ptr-to-trait-obj-wrap-upcast.rs
new file mode 100644
index 0000000000000..ff2c4cacfb1f7
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-wrap-upcast.rs
@@ -0,0 +1,14 @@
+trait Super {}
+trait Sub: Super {}
+
+struct Wrapper<T: ?Sized>(T);
+
+// This cast should not compile.
+// Upcasting can't work here, because we are also changing the type (`Wrapper`),
+// and reinterpreting would be confusing/surprising.
+// See <https://github.com/rust-lang/rust/pull/120248#discussion_r1487739518>
+fn cast(ptr: *const dyn Sub) -> *const Wrapper<dyn Super> {
+    ptr as _ //~ error: casting `*const (dyn Sub + 'static)` as `*const Wrapper<dyn Super>` is invalid
+}
+
+fn main() {}
diff --git a/tests/ui/cast/ptr-to-trait-obj-wrap-upcast.stderr b/tests/ui/cast/ptr-to-trait-obj-wrap-upcast.stderr
new file mode 100644
index 0000000000000..38c8ba96bc5b7
--- /dev/null
+++ b/tests/ui/cast/ptr-to-trait-obj-wrap-upcast.stderr
@@ -0,0 +1,11 @@
+error[E0606]: casting `*const (dyn Sub + 'static)` as `*const Wrapper<dyn Super>` is invalid
+  --> $DIR/ptr-to-trait-obj-wrap-upcast.rs:11:5
+   |
+LL |     ptr as _
+   |     ^^^^^^^^
+   |
+   = note: vtable kinds may not match
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0606`.
diff --git a/tests/ui/const-generics/assoc_const_as_type_argument.rs b/tests/ui/const-generics/assoc_const_as_type_argument.rs
index bec6102417c5f..ffc7f116a94ef 100644
--- a/tests/ui/const-generics/assoc_const_as_type_argument.rs
+++ b/tests/ui/const-generics/assoc_const_as_type_argument.rs
@@ -8,7 +8,6 @@ fn foo<T: Trait>() {
     bar::<<T as Trait>::ASSOC>();
     //~^ ERROR: expected associated type, found associated constant `Trait::ASSOC`
     //~| ERROR: unresolved item provided when a constant was expected
-    //~| ERROR type annotations needed
 }
 
 fn main() {}
diff --git a/tests/ui/const-generics/assoc_const_as_type_argument.stderr b/tests/ui/const-generics/assoc_const_as_type_argument.stderr
index 53edc19b28ca2..ac00954613506 100644
--- a/tests/ui/const-generics/assoc_const_as_type_argument.stderr
+++ b/tests/ui/const-generics/assoc_const_as_type_argument.stderr
@@ -15,19 +15,7 @@ help: if this generic argument was intended as a const parameter, surround it wi
 LL |     bar::<{ <T as Trait>::ASSOC }>();
    |           +                     +
 
-error[E0284]: type annotations needed
-  --> $DIR/assoc_const_as_type_argument.rs:8:5
-   |
-LL |     bar::<<T as Trait>::ASSOC>();
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `bar`
-   |
-note: required by a const generic parameter in `bar`
-  --> $DIR/assoc_const_as_type_argument.rs:5:8
-   |
-LL | fn bar<const N: usize>() {}
-   |        ^^^^^^^^^^^^^^ required by this const generic parameter in `bar`
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0284, E0575, E0747.
-For more information about an error, try `rustc --explain E0284`.
+Some errors have detailed explanations: E0575, E0747.
+For more information about an error, try `rustc --explain E0575`.
diff --git a/tests/ui/const-generics/const-arg-in-const-arg.min.stderr b/tests/ui/const-generics/const-arg-in-const-arg.min.stderr
index 2ea9d6b35b451..ce7fce2599360 100644
--- a/tests/ui/const-generics/const-arg-in-const-arg.min.stderr
+++ b/tests/ui/const-generics/const-arg-in-const-arg.min.stderr
@@ -17,7 +17,7 @@ LL |     let _: [u8; bar::<N>()];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:19:23
+  --> $DIR/const-arg-in-const-arg.rs:18:23
    |
 LL |     let _: [u8; faz::<'a>(&())];
    |                       ^^ cannot perform const operation using `'a`
@@ -26,7 +26,7 @@ LL |     let _: [u8; faz::<'a>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:21:23
+  --> $DIR/const-arg-in-const-arg.rs:20:23
    |
 LL |     let _: [u8; baz::<'a>(&())];
    |                       ^^ cannot perform const operation using `'a`
@@ -35,7 +35,7 @@ LL |     let _: [u8; baz::<'a>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:22:23
+  --> $DIR/const-arg-in-const-arg.rs:21:23
    |
 LL |     let _: [u8; faz::<'b>(&())];
    |                       ^^ cannot perform const operation using `'b`
@@ -44,7 +44,7 @@ LL |     let _: [u8; faz::<'b>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:24:23
+  --> $DIR/const-arg-in-const-arg.rs:23:23
    |
 LL |     let _: [u8; baz::<'b>(&())];
    |                       ^^ cannot perform const operation using `'b`
@@ -53,7 +53,7 @@ LL |     let _: [u8; baz::<'b>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:27:23
+  --> $DIR/const-arg-in-const-arg.rs:26:23
    |
 LL |     let _ = [0; bar::<N>()];
    |                       ^ cannot perform const operation using `N`
@@ -62,7 +62,7 @@ LL |     let _ = [0; bar::<N>()];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:30:23
+  --> $DIR/const-arg-in-const-arg.rs:28:23
    |
 LL |     let _ = [0; faz::<'a>(&())];
    |                       ^^ cannot perform const operation using `'a`
@@ -71,7 +71,7 @@ LL |     let _ = [0; faz::<'a>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:32:23
+  --> $DIR/const-arg-in-const-arg.rs:30:23
    |
 LL |     let _ = [0; baz::<'a>(&())];
    |                       ^^ cannot perform const operation using `'a`
@@ -80,7 +80,7 @@ LL |     let _ = [0; baz::<'a>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:33:23
+  --> $DIR/const-arg-in-const-arg.rs:31:23
    |
 LL |     let _ = [0; faz::<'b>(&())];
    |                       ^^ cannot perform const operation using `'b`
@@ -89,7 +89,7 @@ LL |     let _ = [0; faz::<'b>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:35:23
+  --> $DIR/const-arg-in-const-arg.rs:33:23
    |
 LL |     let _ = [0; baz::<'b>(&())];
    |                       ^^ cannot perform const operation using `'b`
@@ -98,7 +98,7 @@ LL |     let _ = [0; baz::<'b>(&())];
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:36:24
+  --> $DIR/const-arg-in-const-arg.rs:34:24
    |
 LL |     let _: Foo<{ foo::<T>() }>;
    |                        ^ cannot perform const operation using `T`
@@ -107,7 +107,7 @@ LL |     let _: Foo<{ foo::<T>() }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:37:24
+  --> $DIR/const-arg-in-const-arg.rs:35:24
    |
 LL |     let _: Foo<{ bar::<N>() }>;
    |                        ^ cannot perform const operation using `N`
@@ -116,7 +116,7 @@ LL |     let _: Foo<{ bar::<N>() }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:40:24
+  --> $DIR/const-arg-in-const-arg.rs:37:24
    |
 LL |     let _: Foo<{ faz::<'a>(&()) }>;
    |                        ^^ cannot perform const operation using `'a`
@@ -125,7 +125,7 @@ LL |     let _: Foo<{ faz::<'a>(&()) }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:42:24
+  --> $DIR/const-arg-in-const-arg.rs:39:24
    |
 LL |     let _: Foo<{ baz::<'a>(&()) }>;
    |                        ^^ cannot perform const operation using `'a`
@@ -134,7 +134,7 @@ LL |     let _: Foo<{ baz::<'a>(&()) }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:43:24
+  --> $DIR/const-arg-in-const-arg.rs:40:24
    |
 LL |     let _: Foo<{ faz::<'b>(&()) }>;
    |                        ^^ cannot perform const operation using `'b`
@@ -143,7 +143,7 @@ LL |     let _: Foo<{ faz::<'b>(&()) }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:45:24
+  --> $DIR/const-arg-in-const-arg.rs:42:24
    |
 LL |     let _: Foo<{ baz::<'b>(&()) }>;
    |                        ^^ cannot perform const operation using `'b`
@@ -152,7 +152,7 @@ LL |     let _: Foo<{ baz::<'b>(&()) }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:46:27
+  --> $DIR/const-arg-in-const-arg.rs:43:27
    |
 LL |     let _ = Foo::<{ foo::<T>() }>;
    |                           ^ cannot perform const operation using `T`
@@ -161,7 +161,7 @@ LL |     let _ = Foo::<{ foo::<T>() }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:47:27
+  --> $DIR/const-arg-in-const-arg.rs:44:27
    |
 LL |     let _ = Foo::<{ bar::<N>() }>;
    |                           ^ cannot perform const operation using `N`
@@ -170,7 +170,7 @@ LL |     let _ = Foo::<{ bar::<N>() }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:50:27
+  --> $DIR/const-arg-in-const-arg.rs:46:27
    |
 LL |     let _ = Foo::<{ faz::<'a>(&()) }>;
    |                           ^^ cannot perform const operation using `'a`
@@ -179,7 +179,7 @@ LL |     let _ = Foo::<{ faz::<'a>(&()) }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:52:27
+  --> $DIR/const-arg-in-const-arg.rs:48:27
    |
 LL |     let _ = Foo::<{ baz::<'a>(&()) }>;
    |                           ^^ cannot perform const operation using `'a`
@@ -188,7 +188,7 @@ LL |     let _ = Foo::<{ baz::<'a>(&()) }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:53:27
+  --> $DIR/const-arg-in-const-arg.rs:49:27
    |
 LL |     let _ = Foo::<{ faz::<'b>(&()) }>;
    |                           ^^ cannot perform const operation using `'b`
@@ -197,7 +197,7 @@ LL |     let _ = Foo::<{ faz::<'b>(&()) }>;
    = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions
 
 error: generic parameters may not be used in const operations
-  --> $DIR/const-arg-in-const-arg.rs:55:27
+  --> $DIR/const-arg-in-const-arg.rs:51:27
    |
 LL |     let _ = Foo::<{ baz::<'b>(&()) }>;
    |                           ^^ cannot perform const operation using `'b`
@@ -216,20 +216,8 @@ help: if this generic argument was intended as a const parameter, surround it wi
 LL |     let _: [u8; bar::<{ N }>()];
    |                       +   +
 
-error[E0284]: type annotations needed
-  --> $DIR/const-arg-in-const-arg.rs:16:17
-   |
-LL |     let _: [u8; bar::<N>()];
-   |                 ^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `bar`
-   |
-note: required by a const generic parameter in `bar`
-  --> $DIR/const-arg-in-const-arg.rs:9:14
-   |
-LL | const fn bar<const N: usize>() -> usize { N }
-   |              ^^^^^^^^^^^^^^ required by this const generic parameter in `bar`
-
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:19:23
+  --> $DIR/const-arg-in-const-arg.rs:18:23
    |
 LL |     let _: [u8; faz::<'a>(&())];
    |                       ^^
@@ -241,7 +229,7 @@ LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:22:23
+  --> $DIR/const-arg-in-const-arg.rs:21:23
    |
 LL |     let _: [u8; faz::<'b>(&())];
    |                       ^^
@@ -253,7 +241,7 @@ LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
 error[E0747]: unresolved item provided when a constant was expected
-  --> $DIR/const-arg-in-const-arg.rs:37:24
+  --> $DIR/const-arg-in-const-arg.rs:35:24
    |
 LL |     let _: Foo<{ bar::<N>() }>;
    |                        ^
@@ -263,20 +251,8 @@ help: if this generic argument was intended as a const parameter, surround it wi
 LL |     let _: Foo<{ bar::<{ N }>() }>;
    |                        +   +
 
-error[E0284]: type annotations needed
-  --> $DIR/const-arg-in-const-arg.rs:37:18
-   |
-LL |     let _: Foo<{ bar::<N>() }>;
-   |                  ^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `bar`
-   |
-note: required by a const generic parameter in `bar`
-  --> $DIR/const-arg-in-const-arg.rs:9:14
-   |
-LL | const fn bar<const N: usize>() -> usize { N }
-   |              ^^^^^^^^^^^^^^ required by this const generic parameter in `bar`
-
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:40:24
+  --> $DIR/const-arg-in-const-arg.rs:37:24
    |
 LL |     let _: Foo<{ faz::<'a>(&()) }>;
    |                        ^^
@@ -288,7 +264,7 @@ LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:43:24
+  --> $DIR/const-arg-in-const-arg.rs:40:24
    |
 LL |     let _: Foo<{ faz::<'b>(&()) }>;
    |                        ^^
@@ -300,7 +276,7 @@ LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
 error: constant expression depends on a generic parameter
-  --> $DIR/const-arg-in-const-arg.rs:26:17
+  --> $DIR/const-arg-in-const-arg.rs:25:17
    |
 LL |     let _ = [0; foo::<T>()];
    |                 ^^^^^^^^^^
@@ -308,7 +284,7 @@ LL |     let _ = [0; foo::<T>()];
    = note: this may fail depending on what value the parameter takes
 
 error[E0747]: unresolved item provided when a constant was expected
-  --> $DIR/const-arg-in-const-arg.rs:27:23
+  --> $DIR/const-arg-in-const-arg.rs:26:23
    |
 LL |     let _ = [0; bar::<N>()];
    |                       ^
@@ -318,20 +294,8 @@ help: if this generic argument was intended as a const parameter, surround it wi
 LL |     let _ = [0; bar::<{ N }>()];
    |                       +   +
 
-error[E0284]: type annotations needed
-  --> $DIR/const-arg-in-const-arg.rs:27:17
-   |
-LL |     let _ = [0; bar::<N>()];
-   |                 ^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `bar`
-   |
-note: required by a const generic parameter in `bar`
-  --> $DIR/const-arg-in-const-arg.rs:9:14
-   |
-LL | const fn bar<const N: usize>() -> usize { N }
-   |              ^^^^^^^^^^^^^^ required by this const generic parameter in `bar`
-
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:30:23
+  --> $DIR/const-arg-in-const-arg.rs:28:23
    |
 LL |     let _ = [0; faz::<'a>(&())];
    |                       ^^
@@ -343,7 +307,7 @@ LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:33:23
+  --> $DIR/const-arg-in-const-arg.rs:31:23
    |
 LL |     let _ = [0; faz::<'b>(&())];
    |                       ^^
@@ -355,7 +319,7 @@ LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
 error[E0747]: unresolved item provided when a constant was expected
-  --> $DIR/const-arg-in-const-arg.rs:47:27
+  --> $DIR/const-arg-in-const-arg.rs:44:27
    |
 LL |     let _ = Foo::<{ bar::<N>() }>;
    |                           ^
@@ -365,20 +329,8 @@ help: if this generic argument was intended as a const parameter, surround it wi
 LL |     let _ = Foo::<{ bar::<{ N }>() }>;
    |                           +   +
 
-error[E0284]: type annotations needed
-  --> $DIR/const-arg-in-const-arg.rs:47:21
-   |
-LL |     let _ = Foo::<{ bar::<N>() }>;
-   |                     ^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `bar`
-   |
-note: required by a const generic parameter in `bar`
-  --> $DIR/const-arg-in-const-arg.rs:9:14
-   |
-LL | const fn bar<const N: usize>() -> usize { N }
-   |              ^^^^^^^^^^^^^^ required by this const generic parameter in `bar`
-
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:50:27
+  --> $DIR/const-arg-in-const-arg.rs:46:27
    |
 LL |     let _ = Foo::<{ faz::<'a>(&()) }>;
    |                           ^^
@@ -390,7 +342,7 @@ LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
 error[E0794]: cannot specify lifetime arguments explicitly if late bound lifetime parameters are present
-  --> $DIR/const-arg-in-const-arg.rs:53:27
+  --> $DIR/const-arg-in-const-arg.rs:49:27
    |
 LL |     let _ = Foo::<{ faz::<'b>(&()) }>;
    |                           ^^
@@ -401,7 +353,7 @@ note: the late bound lifetime parameter is introduced here
 LL | const fn faz<'a>(_: &'a ()) -> usize { 13 }
    |              ^^
 
-error: aborting due to 40 previous errors
+error: aborting due to 36 previous errors
 
-Some errors have detailed explanations: E0284, E0747, E0794.
-For more information about an error, try `rustc --explain E0284`.
+Some errors have detailed explanations: E0747, E0794.
+For more information about an error, try `rustc --explain E0747`.
diff --git a/tests/ui/const-generics/const-arg-in-const-arg.rs b/tests/ui/const-generics/const-arg-in-const-arg.rs
index b95c63309f782..27b74489fe8e0 100644
--- a/tests/ui/const-generics/const-arg-in-const-arg.rs
+++ b/tests/ui/const-generics/const-arg-in-const-arg.rs
@@ -15,7 +15,6 @@ fn test<'a, 'b, T, const N: usize>() where &'b (): Sized {
     let _: [u8; foo::<T>()]; //[min]~ ERROR generic parameters may not
     let _: [u8; bar::<N>()]; //[min]~ ERROR generic parameters may not
                              //[min]~^ ERROR unresolved item provided when a constant was expected
-                             //[min]~| ERROR type annotations needed
     let _: [u8; faz::<'a>(&())]; //[min]~ ERROR generic parameters may not
                                  //[min]~^ ERROR cannot specify lifetime arguments
     let _: [u8; baz::<'a>(&())]; //[min]~ ERROR generic parameters may not
@@ -26,7 +25,6 @@ fn test<'a, 'b, T, const N: usize>() where &'b (): Sized {
     let _ = [0; foo::<T>()]; //[min]~ ERROR constant expression depends on a generic parameter
     let _ = [0; bar::<N>()]; //[min]~ ERROR generic parameters may not
                              //[min]~^ ERROR unresolved item provided when a constant was expected
-                             //[min]~| ERROR type annotations needed
     let _ = [0; faz::<'a>(&())]; //[min]~ ERROR generic parameters may not
                                  //[min]~^ ERROR cannot specify lifetime arguments
     let _ = [0; baz::<'a>(&())]; //[min]~ ERROR generic parameters may not
@@ -36,7 +34,6 @@ fn test<'a, 'b, T, const N: usize>() where &'b (): Sized {
     let _: Foo<{ foo::<T>() }>; //[min]~ ERROR generic parameters may not
     let _: Foo<{ bar::<N>() }>; //[min]~ ERROR generic parameters may not
                                 //[min]~^ ERROR unresolved item provided when a constant was expected
-                                //[min]~| ERROR type annotations needed
     let _: Foo<{ faz::<'a>(&()) }>; //[min]~ ERROR generic parameters may not
                                     //[min]~^ ERROR cannot specify lifetime arguments
     let _: Foo<{ baz::<'a>(&()) }>; //[min]~ ERROR generic parameters may not
@@ -46,7 +43,6 @@ fn test<'a, 'b, T, const N: usize>() where &'b (): Sized {
     let _ = Foo::<{ foo::<T>() }>; //[min]~ ERROR generic parameters may not
     let _ = Foo::<{ bar::<N>() }>; //[min]~ ERROR generic parameters may not
                                    //[min]~^ ERROR unresolved item provided when a constant was expected
-                                   //[min]~| ERROR type annotations needed
     let _ = Foo::<{ faz::<'a>(&()) }>; //[min]~ ERROR generic parameters may not
                                        //[min]~^ ERROR cannot specify lifetime arguments
     let _ = Foo::<{ baz::<'a>(&()) }>; //[min]~ ERROR generic parameters may not
diff --git a/tests/ui/const-generics/generic_const_exprs/issue-80742.rs b/tests/ui/const-generics/generic_const_exprs/issue-80742.rs
index ddb7b5f852e45..30851b49cdcae 100644
--- a/tests/ui/const-generics/generic_const_exprs/issue-80742.rs
+++ b/tests/ui/const-generics/generic_const_exprs/issue-80742.rs
@@ -1,9 +1,9 @@
 //@ check-fail
 //@ known-bug: #97477
 //@ failure-status: 101
-//@ normalize-stderr-test "note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
-//@ normalize-stderr-test "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
+//@ normalize-stderr-test: "note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*\n" -> ""
+//@ normalize-stderr-test: "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
 //@ rustc-env:RUST_BACKTRACE=0
 
 // This test used to cause an ICE in rustc_mir::interpret::step::eval_rvalue_into_place
diff --git a/tests/ui/const-generics/issues/issue-62878.min.stderr b/tests/ui/const-generics/issues/issue-62878.min.stderr
index 3fd50bbe29803..5205726d73845 100644
--- a/tests/ui/const-generics/issues/issue-62878.min.stderr
+++ b/tests/ui/const-generics/issues/issue-62878.min.stderr
@@ -30,31 +30,7 @@ help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
 LL + #![feature(generic_arg_infer)]
    |
 
-error[E0284]: type annotations needed
-  --> $DIR/issue-62878.rs:10:5
-   |
-LL |     foo::<_, { [1] }>();
-   |     ^^^^^^^^^^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `foo`
-   |
-note: required by a const generic parameter in `foo`
-  --> $DIR/issue-62878.rs:5:8
-   |
-LL | fn foo<const N: usize, const A: [u8; N]>() {}
-   |        ^^^^^^^^^^^^^^ required by this const generic parameter in `foo`
-
-error[E0284]: type annotations needed
-  --> $DIR/issue-62878.rs:10:5
-   |
-LL |     foo::<_, { [1] }>();
-   |     ^^^^^^^^^^^^^^^^^ cannot infer the value of the const parameter `A` declared on the function `foo`
-   |
-note: required by a const generic parameter in `foo`
-  --> $DIR/issue-62878.rs:5:24
-   |
-LL | fn foo<const N: usize, const A: [u8; N]>() {}
-   |                        ^^^^^^^^^^^^^^^^ required by this const generic parameter in `foo`
-
-error: aborting due to 5 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0284, E0747, E0770.
-For more information about an error, try `rustc --explain E0284`.
+Some errors have detailed explanations: E0747, E0770.
+For more information about an error, try `rustc --explain E0747`.
diff --git a/tests/ui/const-generics/issues/issue-62878.rs b/tests/ui/const-generics/issues/issue-62878.rs
index c784e95edd824..0b5269df85ee1 100644
--- a/tests/ui/const-generics/issues/issue-62878.rs
+++ b/tests/ui/const-generics/issues/issue-62878.rs
@@ -9,6 +9,4 @@ fn foo<const N: usize, const A: [u8; N]>() {}
 fn main() {
     foo::<_, { [1] }>();
     //[min]~^ ERROR: type provided when a constant was expected
-    //[min]~| ERROR type annotations needed
-    //[min]~| ERROR type annotations needed
 }
diff --git a/tests/ui/const-generics/issues/issue-71381.full.stderr b/tests/ui/const-generics/issues/issue-71381.full.stderr
index 05e847cf4c841..b6460e0017fa5 100644
--- a/tests/ui/const-generics/issues/issue-71381.full.stderr
+++ b/tests/ui/const-generics/issues/issue-71381.full.stderr
@@ -7,25 +7,13 @@ LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "
    = note: type parameters may not be used in the type of const parameters
 
 error[E0770]: the type of const parameters must not depend on other generic parameters
-  --> $DIR/issue-71381.rs:24:40
+  --> $DIR/issue-71381.rs:23:40
    |
 LL |         const FN: unsafe extern "C" fn(Args),
    |                                        ^^^^ the type must not depend on the parameter `Args`
    |
    = note: type parameters may not be used in the type of const parameters
 
-error[E0594]: cannot assign to `self.0`, which is behind a `&` reference
-  --> $DIR/issue-71381.rs:17:9
-   |
-LL |         self.0 = Self::trampiline::<Args, IDX, FN> as _
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `self` is a `&` reference, so the data it refers to cannot be written
-   |
-help: consider changing this to be a mutable reference
-   |
-LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "C" fn(Args)>(&mut self) {
-   |                                                                                         ~~~~~~~~~
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0594, E0770.
-For more information about an error, try `rustc --explain E0594`.
+For more information about this error, try `rustc --explain E0770`.
diff --git a/tests/ui/const-generics/issues/issue-71381.min.stderr b/tests/ui/const-generics/issues/issue-71381.min.stderr
index 1c30e885d1b7d..e16d3b7a8a469 100644
--- a/tests/ui/const-generics/issues/issue-71381.min.stderr
+++ b/tests/ui/const-generics/issues/issue-71381.min.stderr
@@ -7,7 +7,7 @@ LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "
    = note: type parameters may not be used in the type of const parameters
 
 error[E0770]: the type of const parameters must not depend on other generic parameters
-  --> $DIR/issue-71381.rs:24:40
+  --> $DIR/issue-71381.rs:23:40
    |
 LL |         const FN: unsafe extern "C" fn(Args),
    |                                        ^^^^ the type must not depend on the parameter `Args`
@@ -23,25 +23,13 @@ LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "
    = note: the only supported types are integers, `bool` and `char`
 
 error: using function pointers as const generic parameters is forbidden
-  --> $DIR/issue-71381.rs:24:19
+  --> $DIR/issue-71381.rs:23:19
    |
 LL |         const FN: unsafe extern "C" fn(Args),
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: the only supported types are integers, `bool` and `char`
 
-error[E0594]: cannot assign to `self.0`, which is behind a `&` reference
-  --> $DIR/issue-71381.rs:17:9
-   |
-LL |         self.0 = Self::trampiline::<Args, IDX, FN> as _
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `self` is a `&` reference, so the data it refers to cannot be written
-   |
-help: consider changing this to be a mutable reference
-   |
-LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "C" fn(Args)>(&mut self) {
-   |                                                                                         ~~~~~~~~~
-
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors
 
-Some errors have detailed explanations: E0594, E0770.
-For more information about an error, try `rustc --explain E0594`.
+For more information about this error, try `rustc --explain E0770`.
diff --git a/tests/ui/const-generics/issues/issue-71381.rs b/tests/ui/const-generics/issues/issue-71381.rs
index 166b724a7a33a..e472ef31fcdd3 100644
--- a/tests/ui/const-generics/issues/issue-71381.rs
+++ b/tests/ui/const-generics/issues/issue-71381.rs
@@ -15,7 +15,6 @@ impl Test {
         //~^ ERROR: the type of const parameters must not depend on other generic parameters
         //[min]~^^ ERROR: using function pointers as const generic parameters is forbidden
         self.0 = Self::trampiline::<Args, IDX, FN> as _
-        //~^ ERROR: cannot assign to `self.0`
     }
 
     unsafe extern "C" fn trampiline<
diff --git a/tests/ui/const-generics/legacy-const-generics-bad.stderr b/tests/ui/const-generics/legacy-const-generics-bad.stderr
index 83c71e07253b3..e9ea22e472c18 100644
--- a/tests/ui/const-generics/legacy-const-generics-bad.stderr
+++ b/tests/ui/const-generics/legacy-const-generics-bad.stderr
@@ -1,10 +1,13 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/legacy-const-generics-bad.rs:7:35
    |
-LL |     let a = 1;
-   |     ----- help: consider using `const` instead of `let`: `const a`
 LL |     legacy_const_generics::foo(0, a, 2);
    |                                   ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const a: /* Type */ = 1;
+   |     ~~~~~  ++++++++++++
 
 error: generic parameters may not be used in const operations
   --> $DIR/legacy-const-generics-bad.rs:12:35
diff --git a/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.rs b/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.rs
index 497c020bde43e..e12e07a28e763 100644
--- a/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.rs
+++ b/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.rs
@@ -12,7 +12,6 @@ fn b() {
     //~^ ERROR expected trait, found constant `BAR`
     //~| ERROR expected trait, found constant `BAR`
     //~| ERROR type provided when a constant was expected
-    //~| ERROR type annotations needed
 }
 fn c() {
     foo::<3 + 3>(); //~ ERROR expressions must be enclosed in braces
diff --git a/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.stderr b/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.stderr
index c2ba517f60960..d9bcc523b1fc4 100644
--- a/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.stderr
+++ b/tests/ui/const-generics/min_const_generics/const-expression-suggest-missing-braces.stderr
@@ -10,7 +10,7 @@ LL |     foo::<{ BAR + 3 }>();
    |           +         +
 
 error: expressions must be enclosed in braces to be used as const generic arguments
-  --> $DIR/const-expression-suggest-missing-braces.rs:18:11
+  --> $DIR/const-expression-suggest-missing-braces.rs:17:11
    |
 LL |     foo::<3 + 3>();
    |           ^^^^^
@@ -21,7 +21,7 @@ LL |     foo::<{ 3 + 3 }>();
    |           +       +
 
 error: expected one of `,` or `>`, found `-`
-  --> $DIR/const-expression-suggest-missing-braces.rs:21:15
+  --> $DIR/const-expression-suggest-missing-braces.rs:20:15
    |
 LL |     foo::<BAR - 3>();
    |               ^ expected one of `,` or `>`
@@ -32,7 +32,7 @@ LL |     foo::<{ BAR - 3 }>();
    |           +         +
 
 error: expected one of `,` or `>`, found `-`
-  --> $DIR/const-expression-suggest-missing-braces.rs:24:15
+  --> $DIR/const-expression-suggest-missing-braces.rs:23:15
    |
 LL |     foo::<BAR - BAR>();
    |               ^ expected one of `,` or `>`
@@ -43,7 +43,7 @@ LL |     foo::<{ BAR - BAR }>();
    |           +           +
 
 error: expressions must be enclosed in braces to be used as const generic arguments
-  --> $DIR/const-expression-suggest-missing-braces.rs:27:11
+  --> $DIR/const-expression-suggest-missing-braces.rs:26:11
    |
 LL |     foo::<100 - BAR>();
    |           ^^^^^^^^^
@@ -54,7 +54,7 @@ LL |     foo::<{ 100 - BAR }>();
    |           +           +
 
 error: expected one of `,` or `>`, found `(`
-  --> $DIR/const-expression-suggest-missing-braces.rs:30:19
+  --> $DIR/const-expression-suggest-missing-braces.rs:29:19
    |
 LL |     foo::<bar<i32>()>();
    |                   ^ expected one of `,` or `>`
@@ -65,7 +65,7 @@ LL |     foo::<{ bar<i32>() }>();
    |           +            +
 
 error: expected one of `,` or `>`, found `(`
-  --> $DIR/const-expression-suggest-missing-braces.rs:33:21
+  --> $DIR/const-expression-suggest-missing-braces.rs:32:21
    |
 LL |     foo::<bar::<i32>()>();
    |                     ^ expected one of `,` or `>`
@@ -76,7 +76,7 @@ LL |     foo::<{ bar::<i32>() }>();
    |           +              +
 
 error: expected one of `,` or `>`, found `(`
-  --> $DIR/const-expression-suggest-missing-braces.rs:36:21
+  --> $DIR/const-expression-suggest-missing-braces.rs:35:21
    |
 LL |     foo::<bar::<i32>() + BAR>();
    |                     ^ expected one of `,` or `>`
@@ -87,7 +87,7 @@ LL |     foo::<{ bar::<i32>() + BAR }>();
    |           +                    +
 
 error: expected one of `,` or `>`, found `(`
-  --> $DIR/const-expression-suggest-missing-braces.rs:39:21
+  --> $DIR/const-expression-suggest-missing-braces.rs:38:21
    |
 LL |     foo::<bar::<i32>() - BAR>();
    |                     ^ expected one of `,` or `>`
@@ -98,7 +98,7 @@ LL |     foo::<{ bar::<i32>() - BAR }>();
    |           +                    +
 
 error: expected one of `,` or `>`, found `-`
-  --> $DIR/const-expression-suggest-missing-braces.rs:42:15
+  --> $DIR/const-expression-suggest-missing-braces.rs:41:15
    |
 LL |     foo::<BAR - bar::<i32>()>();
    |               ^ expected one of `,` or `>`
@@ -109,7 +109,7 @@ LL |     foo::<{ BAR - bar::<i32>() }>();
    |           +                    +
 
 error: expected one of `,` or `>`, found `-`
-  --> $DIR/const-expression-suggest-missing-braces.rs:45:15
+  --> $DIR/const-expression-suggest-missing-braces.rs:44:15
    |
 LL |     foo::<BAR - bar::<i32>()>();
    |               ^ expected one of `,` or `>`
@@ -137,19 +137,7 @@ error[E0747]: type provided when a constant was expected
 LL |     foo::<BAR + BAR>();
    |           ^^^^^^^^^
 
-error[E0284]: type annotations needed
-  --> $DIR/const-expression-suggest-missing-braces.rs:11:5
-   |
-LL |     foo::<BAR + BAR>();
-   |     ^^^^^^^^^^^^^^^^ cannot infer the value of the const parameter `C` declared on the function `foo`
-   |
-note: required by a const generic parameter in `foo`
-  --> $DIR/const-expression-suggest-missing-braces.rs:1:8
-   |
-LL | fn foo<const C: usize>() {}
-   |        ^^^^^^^^^^^^^^ required by this const generic parameter in `foo`
-
-error: aborting due to 15 previous errors
+error: aborting due to 14 previous errors
 
-Some errors have detailed explanations: E0284, E0404, E0747.
-For more information about an error, try `rustc --explain E0284`.
+Some errors have detailed explanations: E0404, E0747.
+For more information about an error, try `rustc --explain E0404`.
diff --git a/tests/ui/const-generics/min_const_generics/macro-fail.rs b/tests/ui/const-generics/min_const_generics/macro-fail.rs
index 25726490c2cca..8cfa5293cc28f 100644
--- a/tests/ui/const-generics/min_const_generics/macro-fail.rs
+++ b/tests/ui/const-generics/min_const_generics/macro-fail.rs
@@ -16,7 +16,6 @@ fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
   //~| ERROR: type provided when a constant was expected
   Example::<gimme_a_const!(marker)>
   //~^ ERROR: type provided when a constant was expected
-  //~| ERROR type annotations needed
 }
 
 fn from_marker(_: impl Marker<{
@@ -37,10 +36,8 @@ fn main() {
 
   let _fail = Example::<external_macro!()>;
   //~^ ERROR: type provided when a constant
-  //~| ERROR type annotations needed
 
   let _fail = Example::<gimme_a_const!()>;
   //~^ ERROR unexpected end of macro invocation
   //~| ERROR: type provided when a constant was expected
-  //~| ERROR type annotations needed
 }
diff --git a/tests/ui/const-generics/min_const_generics/macro-fail.stderr b/tests/ui/const-generics/min_const_generics/macro-fail.stderr
index 4e183fe5b1c55..34764982bb046 100644
--- a/tests/ui/const-generics/min_const_generics/macro-fail.stderr
+++ b/tests/ui/const-generics/min_const_generics/macro-fail.stderr
@@ -1,5 +1,5 @@
 error: expected type, found `{`
-  --> $DIR/macro-fail.rs:31:27
+  --> $DIR/macro-fail.rs:30:27
    |
 LL | fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
    |                                 ----------------------
@@ -13,7 +13,7 @@ LL |       ($rusty: ident) => {{ let $rusty = 3; *&$rusty }}
    = note: this error originates in the macro `gimme_a_const` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: expected type, found `{`
-  --> $DIR/macro-fail.rs:31:27
+  --> $DIR/macro-fail.rs:30:27
    |
 LL |   Example::<gimme_a_const!(marker)>
    |             ----------------------
@@ -41,7 +41,7 @@ LL |   let _fail = Example::<external_macro!()>;
    = note: this error originates in the macro `external_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: unexpected end of macro invocation
-  --> $DIR/macro-fail.rs:42:25
+  --> $DIR/macro-fail.rs:40:25
    |
 LL |     macro_rules! gimme_a_const {
    |     -------------------------- when calling this macro
@@ -50,7 +50,7 @@ LL |   let _fail = Example::<gimme_a_const!()>;
    |                         ^^^^^^^^^^^^^^^^ missing tokens in macro arguments
    |
 note: while trying to match meta-variable `$rusty:ident`
-  --> $DIR/macro-fail.rs:31:8
+  --> $DIR/macro-fail.rs:30:8
    |
 LL |       ($rusty: ident) => {{ let $rusty = 3; *&$rusty }}
    |        ^^^^^^^^^^^^^
@@ -75,63 +75,18 @@ error[E0747]: type provided when a constant was expected
 LL |   Example::<gimme_a_const!(marker)>
    |             ^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0284]: type annotations needed
-  --> $DIR/macro-fail.rs:17:3
-   |
-LL |   Example::<gimme_a_const!(marker)>
-   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer the value of the const parameter `N` declared on the struct `Example`
-   |
-note: required by a const generic parameter in `Example`
-  --> $DIR/macro-fail.rs:1:16
-   |
-LL | struct Example<const N: usize>;
-   |                ^^^^^^^^^^^^^^ required by this const generic parameter in `Example`
-
 error[E0747]: type provided when a constant was expected
-  --> $DIR/macro-fail.rs:38:25
+  --> $DIR/macro-fail.rs:37:25
    |
 LL |   let _fail = Example::<external_macro!()>;
    |                         ^^^^^^^^^^^^^^^^^
 
 error[E0747]: type provided when a constant was expected
-  --> $DIR/macro-fail.rs:42:25
+  --> $DIR/macro-fail.rs:40:25
    |
 LL |   let _fail = Example::<gimme_a_const!()>;
    |                         ^^^^^^^^^^^^^^^^
 
-error[E0284]: type annotations needed for `Example<_>`
-  --> $DIR/macro-fail.rs:38:7
-   |
-LL |   let _fail = Example::<external_macro!()>;
-   |       ^^^^^   ---------------------------- type must be known at this point
-   |
-note: required by a const generic parameter in `Example`
-  --> $DIR/macro-fail.rs:1:16
-   |
-LL | struct Example<const N: usize>;
-   |                ^^^^^^^^^^^^^^ required by this const generic parameter in `Example`
-help: consider giving `_fail` an explicit type, where the value of const parameter `N` is specified
-   |
-LL |   let _fail: Example<N> = Example::<external_macro!()>;
-   |            ++++++++++++
-
-error[E0284]: type annotations needed for `Example<_>`
-  --> $DIR/macro-fail.rs:42:7
-   |
-LL |   let _fail = Example::<gimme_a_const!()>;
-   |       ^^^^^   --------------------------- type must be known at this point
-   |
-note: required by a const generic parameter in `Example`
-  --> $DIR/macro-fail.rs:1:16
-   |
-LL | struct Example<const N: usize>;
-   |                ^^^^^^^^^^^^^^ required by this const generic parameter in `Example`
-help: consider giving `_fail` an explicit type, where the value of const parameter `N` is specified
-   |
-LL |   let _fail: Example<N> = Example::<gimme_a_const!()>;
-   |            ++++++++++++
-
-error: aborting due to 12 previous errors
+error: aborting due to 9 previous errors
 
-Some errors have detailed explanations: E0284, E0747.
-For more information about an error, try `rustc --explain E0284`.
+For more information about this error, try `rustc --explain E0747`.
diff --git a/tests/ui/const-generics/suggest_const_for_array.rs b/tests/ui/const-generics/suggest_const_for_array.rs
index 4d29d0693759f..b52fd152f976a 100644
--- a/tests/ui/const-generics/suggest_const_for_array.rs
+++ b/tests/ui/const-generics/suggest_const_for_array.rs
@@ -5,8 +5,6 @@ fn example<const N: usize>() {}
 fn other() {
     example::<[usize; 3]>();
     //~^ ERROR type provided when a const
-    //~| ERROR type annotations needed
     example::<[usize; 4 + 5]>();
     //~^ ERROR type provided when a const
-    //~| ERROR type annotations needed
 }
diff --git a/tests/ui/const-generics/suggest_const_for_array.stderr b/tests/ui/const-generics/suggest_const_for_array.stderr
index c867914070bb7..f0ad8368e5d71 100644
--- a/tests/ui/const-generics/suggest_const_for_array.stderr
+++ b/tests/ui/const-generics/suggest_const_for_array.stderr
@@ -5,36 +5,11 @@ LL |     example::<[usize; 3]>();
    |               ^^^^^^^^^^ help: array type provided where a `usize` was expected, try: `{ 3 }`
 
 error[E0747]: type provided when a constant was expected
-  --> $DIR/suggest_const_for_array.rs:9:15
+  --> $DIR/suggest_const_for_array.rs:8:15
    |
 LL |     example::<[usize; 4 + 5]>();
    |               ^^^^^^^^^^^^^^ help: array type provided where a `usize` was expected, try: `{ 4 + 5 }`
 
-error[E0284]: type annotations needed
-  --> $DIR/suggest_const_for_array.rs:6:5
-   |
-LL |     example::<[usize; 3]>();
-   |     ^^^^^^^^^^^^^^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `example`
-   |
-note: required by a const generic parameter in `example`
-  --> $DIR/suggest_const_for_array.rs:3:12
-   |
-LL | fn example<const N: usize>() {}
-   |            ^^^^^^^^^^^^^^ required by this const generic parameter in `example`
-
-error[E0284]: type annotations needed
-  --> $DIR/suggest_const_for_array.rs:9:5
-   |
-LL |     example::<[usize; 4 + 5]>();
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `example`
-   |
-note: required by a const generic parameter in `example`
-  --> $DIR/suggest_const_for_array.rs:3:12
-   |
-LL | fn example<const N: usize>() {}
-   |            ^^^^^^^^^^^^^^ required by this const generic parameter in `example`
-
-error: aborting due to 4 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0284, E0747.
-For more information about an error, try `rustc --explain E0284`.
+For more information about this error, try `rustc --explain E0747`.
diff --git a/tests/ui/const-ptr/forbidden_slices.rs b/tests/ui/const-ptr/forbidden_slices.rs
index 2550a3a01096b..bc4993466eb10 100644
--- a/tests/ui/const-ptr/forbidden_slices.rs
+++ b/tests/ui/const-ptr/forbidden_slices.rs
@@ -1,6 +1,6 @@
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 
 #![feature(
     slice_from_ptr_range,
diff --git a/tests/ui/consts/const-eval/const-eval-query-stack.rs b/tests/ui/consts/const-eval/const-eval-query-stack.rs
index 53589bfd2ab2b..c015c5e0c4985 100644
--- a/tests/ui/consts/const-eval/const-eval-query-stack.rs
+++ b/tests/ui/consts/const-eval/const-eval-query-stack.rs
@@ -1,16 +1,16 @@
 //@ compile-flags: -Ztreat-err-as-bug=1
 //@ failure-status: 101
 //@ rustc-env:RUST_BACKTRACE=1
-//@ normalize-stderr-test "\nerror: .*unexpectedly panicked.*\n\n" -> ""
-//@ normalize-stderr-test "note: we would appreciate a bug report.*\n\n" -> ""
-//@ normalize-stderr-test "note: compiler flags.*\n\n" -> ""
-//@ normalize-stderr-test "note: rustc.*running on.*\n\n" -> ""
-//@ normalize-stderr-test "thread.*panicked.*:\n.*\n" -> ""
-//@ normalize-stderr-test "stack backtrace:\n" -> ""
-//@ normalize-stderr-test "\s\d{1,}: .*\n" -> ""
-//@ normalize-stderr-test "\s at .*\n" -> ""
-//@ normalize-stderr-test ".*note: Some details.*\n" -> ""
-//@ normalize-stderr-test ".*omitted \d{1,} frame.*\n" -> ""
+//@ normalize-stderr-test: "\nerror: .*unexpectedly panicked.*\n\n" -> ""
+//@ normalize-stderr-test: "note: we would appreciate a bug report.*\n\n" -> ""
+//@ normalize-stderr-test: "note: compiler flags.*\n\n" -> ""
+//@ normalize-stderr-test: "note: rustc.*running on.*\n\n" -> ""
+//@ normalize-stderr-test: "thread.*panicked.*:\n.*\n" -> ""
+//@ normalize-stderr-test: "stack backtrace:\n" -> ""
+//@ normalize-stderr-test: "\s\d{1,}: .*\n" -> ""
+//@ normalize-stderr-test: "\s at .*\n" -> ""
+//@ normalize-stderr-test: ".*note: Some details.*\n" -> ""
+//@ normalize-stderr-test: ".*omitted \d{1,} frame.*\n" -> ""
 #![allow(unconditional_panic)]
 
 const X: i32 = 1 / 0; //~ERROR constant
diff --git a/tests/ui/consts/const-eval/heap/dealloc_intrinsic_dangling.rs b/tests/ui/consts/const-eval/heap/dealloc_intrinsic_dangling.rs
index 0f70862b5d9cc..da7ab7f8ba43a 100644
--- a/tests/ui/consts/const-eval/heap/dealloc_intrinsic_dangling.rs
+++ b/tests/ui/consts/const-eval/heap/dealloc_intrinsic_dangling.rs
@@ -3,9 +3,9 @@
 #![feature(const_mut_refs)]
 
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
-//@ normalize-stderr-test "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
 
 use std::intrinsics;
 
diff --git a/tests/ui/consts/const-eval/raw-bytes.rs b/tests/ui/consts/const-eval/raw-bytes.rs
index 2fbf135c9975c..1c7ef6f2b0f8e 100644
--- a/tests/ui/consts/const-eval/raw-bytes.rs
+++ b/tests/ui/consts/const-eval/raw-bytes.rs
@@ -1,7 +1,7 @@
 //@ stderr-per-bitwidth
 //@ ignore-endian-big
 // ignore-tidy-linelength
-//@ normalize-stderr-test "╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼" -> "╾ALLOC_ID$1╼"
+//@ normalize-stderr-test: "╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼" -> "╾ALLOC_ID$1╼"
 #![allow(invalid_value)]
 #![feature(never_type, rustc_attrs, ptr_metadata, slice_from_ptr_range, const_slice_from_ptr_range)]
 
diff --git a/tests/ui/consts/const-eval/ub-enum.rs b/tests/ui/consts/const-eval/ub-enum.rs
index 71d450c014fc1..728c1666deb61 100644
--- a/tests/ui/consts/const-eval/ub-enum.rs
+++ b/tests/ui/consts/const-eval/ub-enum.rs
@@ -1,7 +1,7 @@
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
-//@ normalize-stderr-test "0x0+" -> "0x0"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "0x0+" -> "0x0"
 #![feature(never_type)]
 #![allow(invalid_value)]
 
diff --git a/tests/ui/consts/const-eval/ub-nonnull.rs b/tests/ui/consts/const-eval/ub-nonnull.rs
index 10d304436f807..47d3ca97fda7b 100644
--- a/tests/ui/consts/const-eval/ub-nonnull.rs
+++ b/tests/ui/consts/const-eval/ub-nonnull.rs
@@ -1,6 +1,6 @@
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![allow(invalid_value)] // make sure we cannot allow away the errors tested here
 #![feature(rustc_attrs, ptr_metadata)]
 
diff --git a/tests/ui/consts/const-eval/ub-ref-ptr.rs b/tests/ui/consts/const-eval/ub-ref-ptr.rs
index 78dcd1c1f42e6..44b25a6438ea8 100644
--- a/tests/ui/consts/const-eval/ub-ref-ptr.rs
+++ b/tests/ui/consts/const-eval/ub-ref-ptr.rs
@@ -1,7 +1,7 @@
 // ignore-tidy-linelength
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![allow(invalid_value)]
 
 use std::mem;
diff --git a/tests/ui/consts/const-eval/ub-uninhabit.rs b/tests/ui/consts/const-eval/ub-uninhabit.rs
index cd29c22262b67..0167de26e9420 100644
--- a/tests/ui/consts/const-eval/ub-uninhabit.rs
+++ b/tests/ui/consts/const-eval/ub-uninhabit.rs
@@ -1,6 +1,6 @@
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![feature(core_intrinsics)]
 #![feature(never_type)]
 
diff --git a/tests/ui/consts/const-eval/ub-wide-ptr.rs b/tests/ui/consts/const-eval/ub-wide-ptr.rs
index 53207e43fdf8e..d0d93081738fe 100644
--- a/tests/ui/consts/const-eval/ub-wide-ptr.rs
+++ b/tests/ui/consts/const-eval/ub-wide-ptr.rs
@@ -5,10 +5,10 @@
 use std::{ptr, mem};
 
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
-//@ normalize-stderr-test "offset \d+" -> "offset N"
-//@ normalize-stderr-test "size \d+" -> "size N"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "offset \d+" -> "offset N"
+//@ normalize-stderr-test: "size \d+" -> "size N"
 
 
 /// A newtype wrapper to prevent MIR generation from inserting reborrows that would affect the error
diff --git a/tests/ui/consts/const-mut-refs/mut_ref_in_final_dynamic_check.rs b/tests/ui/consts/const-mut-refs/mut_ref_in_final_dynamic_check.rs
index b86846af98813..c12c22447b59c 100644
--- a/tests/ui/consts/const-mut-refs/mut_ref_in_final_dynamic_check.rs
+++ b/tests/ui/consts/const-mut-refs/mut_ref_in_final_dynamic_check.rs
@@ -1,6 +1,6 @@
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "( 0x[0-9a-f][0-9a-f] │)? ([0-9a-f][0-9a-f] |__ |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> " HEX_DUMP"
-//@ normalize-stderr-test "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "( 0x[0-9a-f][0-9a-f] │)? ([0-9a-f][0-9a-f] |__ |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> " HEX_DUMP"
+//@ normalize-stderr-test: "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
 #![feature(const_mut_refs, const_refs_to_static)]
 #![feature(raw_ref_op)]
 
diff --git a/tests/ui/consts/const_refs_to_static_fail.rs b/tests/ui/consts/const_refs_to_static_fail.rs
index e001c4d6395bf..806aa5f8f6fba 100644
--- a/tests/ui/consts/const_refs_to_static_fail.rs
+++ b/tests/ui/consts/const_refs_to_static_fail.rs
@@ -1,5 +1,5 @@
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![feature(const_refs_to_static, const_mut_refs, sync_unsafe_cell)]
 use std::cell::SyncUnsafeCell;
 
diff --git a/tests/ui/consts/const_refs_to_static_fail_invalid.rs b/tests/ui/consts/const_refs_to_static_fail_invalid.rs
index be1574af588a3..c58606d2ebb5f 100644
--- a/tests/ui/consts/const_refs_to_static_fail_invalid.rs
+++ b/tests/ui/consts/const_refs_to_static_fail_invalid.rs
@@ -1,5 +1,5 @@
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![feature(const_refs_to_static)]
 #![allow(static_mut_refs)]
 
diff --git a/tests/ui/consts/dangling-alloc-id-ice.rs b/tests/ui/consts/dangling-alloc-id-ice.rs
index 76d6f33baf34b..da95d4d134760 100644
--- a/tests/ui/consts/dangling-alloc-id-ice.rs
+++ b/tests/ui/consts/dangling-alloc-id-ice.rs
@@ -1,8 +1,8 @@
 // https://github.com/rust-lang/rust/issues/55223
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
-//@ normalize-stderr-test "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
 
 union Foo<'a> {
     y: &'a (),
diff --git a/tests/ui/consts/dangling-zst-ice-issue-126393.rs b/tests/ui/consts/dangling-zst-ice-issue-126393.rs
index 917aa0572fc0d..b56fcd235c7db 100644
--- a/tests/ui/consts/dangling-zst-ice-issue-126393.rs
+++ b/tests/ui/consts/dangling-zst-ice-issue-126393.rs
@@ -1,7 +1,7 @@
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
-//@ normalize-stderr-test "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "HEX_DUMP\s*\n\s*HEX_DUMP" -> "HEX_DUMP"
 
 pub struct Wrapper;
 pub static MAGIC_FFI_REF: &'static Wrapper = unsafe {
diff --git a/tests/ui/consts/issue-3521.stderr b/tests/ui/consts/issue-3521.stderr
index 70ce9b2d6a08a..c0e4cdc5a94ce 100644
--- a/tests/ui/consts/issue-3521.stderr
+++ b/tests/ui/consts/issue-3521.stderr
@@ -1,11 +1,13 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-3521.rs:8:15
    |
-LL |     let foo: isize = 100;
-   |     ------- help: consider using `const` instead of `let`: `const foo`
-...
 LL |         Bar = foo
    |               ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: isize = 100;
+   |     ~~~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/consts/issue-91560.stderr b/tests/ui/consts/issue-91560.stderr
index e1b5d4cacf8e3..37c8f50d49434 100644
--- a/tests/ui/consts/issue-91560.stderr
+++ b/tests/ui/consts/issue-91560.stderr
@@ -1,20 +1,24 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-91560.rs:10:19
    |
-LL |     let mut length: usize = 2;
-   |     -------------- help: consider using `const` instead of `let`: `const length`
-LL |
 LL |     let arr = [0; length];
    |                   ^^^^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const length: usize = 2;
+   |     ~~~~~
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-91560.rs:17:19
    |
-LL |     let   length: usize = 2;
-   |     ------------ help: consider using `const` instead of `let`: `const length`
-LL |
 LL |     let arr = [0; length];
    |                   ^^^^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const length: usize = 2;
+   |     ~~~~~
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/miri_unleashed/const_refers_to_static.rs b/tests/ui/consts/miri_unleashed/const_refers_to_static.rs
index 31f89030bb345..5625953257335 100644
--- a/tests/ui/consts/miri_unleashed/const_refers_to_static.rs
+++ b/tests/ui/consts/miri_unleashed/const_refers_to_static.rs
@@ -1,6 +1,6 @@
 //@ compile-flags: -Zunleash-the-miri-inside-of-you
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 
 use std::sync::atomic::AtomicUsize;
 use std::sync::atomic::Ordering;
diff --git a/tests/ui/consts/miri_unleashed/const_refers_to_static_cross_crate.rs b/tests/ui/consts/miri_unleashed/const_refers_to_static_cross_crate.rs
index fa3ca6928e35b..a6d75658c7580 100644
--- a/tests/ui/consts/miri_unleashed/const_refers_to_static_cross_crate.rs
+++ b/tests/ui/consts/miri_unleashed/const_refers_to_static_cross_crate.rs
@@ -1,7 +1,7 @@
 //@ compile-flags: -Zunleash-the-miri-inside-of-you
 //@ aux-build:static_cross_crate.rs
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![feature(half_open_range_patterns_in_slices)]
 #![allow(static_mut_refs)]
 
diff --git a/tests/ui/consts/miri_unleashed/mutable_references.rs b/tests/ui/consts/miri_unleashed/mutable_references.rs
index 07f1d70259f0d..efb346f91aefe 100644
--- a/tests/ui/consts/miri_unleashed/mutable_references.rs
+++ b/tests/ui/consts/miri_unleashed/mutable_references.rs
@@ -1,6 +1,6 @@
 //@ compile-flags: -Zunleash-the-miri-inside-of-you
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 
 #![deny(const_eval_mutable_ptr_in_final_value)]
 use std::cell::UnsafeCell;
diff --git a/tests/ui/consts/miri_unleashed/mutable_references_err.rs b/tests/ui/consts/miri_unleashed/mutable_references_err.rs
index a3da545846e9d..8398b0758dddd 100644
--- a/tests/ui/consts/miri_unleashed/mutable_references_err.rs
+++ b/tests/ui/consts/miri_unleashed/mutable_references_err.rs
@@ -1,6 +1,6 @@
 //@ compile-flags: -Zunleash-the-miri-inside-of-you
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![allow(invalid_reference_casting, static_mut_refs)]
 #![deny(const_eval_mutable_ptr_in_final_value)]
 use std::cell::UnsafeCell;
diff --git a/tests/ui/consts/non-const-value-in-const.stderr b/tests/ui/consts/non-const-value-in-const.stderr
index 0ce4b4b705334..654b573544c2e 100644
--- a/tests/ui/consts/non-const-value-in-const.stderr
+++ b/tests/ui/consts/non-const-value-in-const.stderr
@@ -2,18 +2,23 @@ error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/non-const-value-in-const.rs:3:20
    |
 LL |     const Y: i32 = x;
-   |     -------        ^ non-constant value
-   |     |
-   |     help: consider using `let` instead of `const`: `let Y`
+   |                    ^ non-constant value
+   |
+help: consider using `let` instead of `const`
+   |
+LL |     let Y: i32 = x;
+   |     ~~~
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/non-const-value-in-const.rs:6:17
    |
-LL |     let x = 5;
-   |     ----- help: consider using `const` instead of `let`: `const x`
-...
 LL |     let _ = [0; x];
    |                 ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const x: /* Type */ = 5;
+   |     ~~~~~  ++++++++++++
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/consts/offset_ub.rs b/tests/ui/consts/offset_ub.rs
index 36e4ff1281a11..ebc7019a75aa8 100644
--- a/tests/ui/consts/offset_ub.rs
+++ b/tests/ui/consts/offset_ub.rs
@@ -1,7 +1,7 @@
 use std::ptr;
 
 
-//@ normalize-stderr-test "0x7f+" -> "0x7f..f"
+//@ normalize-stderr-test: "0x7f+" -> "0x7f..f"
 
 
 pub const BEFORE_START: *const u8 = unsafe { (&0u8 as *const u8).offset(-1) }; //~NOTE
diff --git a/tests/ui/consts/overflowing-consts.rs b/tests/ui/consts/overflowing-consts.rs
index 52c0623f2c037..68282750dce2e 100644
--- a/tests/ui/consts/overflowing-consts.rs
+++ b/tests/ui/consts/overflowing-consts.rs
@@ -6,8 +6,8 @@
 //@ [opt]compile-flags: -O
 //@ [opt_with_overflow_checks]compile-flags: -C overflow-checks=on -O
 //@ ignore-pass (test tests codegen-time behaviour)
-//@ normalize-stderr-test "shift left by `(64|32)_usize`, which" -> "shift left by `%BITS%`, which"
-//@ normalize-stderr-test "shift right by `(64|32)_usize`, which" -> "shift right by `%BITS%`, which"
+//@ normalize-stderr-test: "shift left by `(64|32)_usize`, which" -> "shift left by `%BITS%`, which"
+//@ normalize-stderr-test: "shift right by `(64|32)_usize`, which" -> "shift right by `%BITS%`, which"
 
 
 #[cfg(target_pointer_width = "32")]
diff --git a/tests/ui/consts/transmute-size-mismatch-before-typeck.rs b/tests/ui/consts/transmute-size-mismatch-before-typeck.rs
index 2ddce483564f7..44eac5b16cc0b 100644
--- a/tests/ui/consts/transmute-size-mismatch-before-typeck.rs
+++ b/tests/ui/consts/transmute-size-mismatch-before-typeck.rs
@@ -1,7 +1,7 @@
-//@ normalize-stderr-64bit "64 bits" -> "word size"
-//@ normalize-stderr-32bit "32 bits" -> "word size"
-//@ normalize-stderr-64bit "128 bits" -> "2 * word size"
-//@ normalize-stderr-32bit "64 bits" -> "2 * word size"
+//@ normalize-stderr-64bit: "64 bits" -> "word size"
+//@ normalize-stderr-32bit: "32 bits" -> "word size"
+//@ normalize-stderr-64bit: "128 bits" -> "2 * word size"
+//@ normalize-stderr-32bit: "64 bits" -> "2 * word size"
 
 fn main() {
     match &b""[..] {
diff --git a/tests/ui/consts/validate_never_arrays.rs b/tests/ui/consts/validate_never_arrays.rs
index aa5dbdf823357..7585a78a0d353 100644
--- a/tests/ui/consts/validate_never_arrays.rs
+++ b/tests/ui/consts/validate_never_arrays.rs
@@ -1,6 +1,6 @@
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 #![feature(never_type)]
 
 const _: &[!; 1] = unsafe { &*(1_usize as *const [!; 1]) }; //~ ERROR undefined behavior
diff --git a/tests/ui/coroutine/static-not-unpin.rs b/tests/ui/coroutine/static-not-unpin.rs
index 2bc25e3796d45..54148368b1392 100644
--- a/tests/ui/coroutine/static-not-unpin.rs
+++ b/tests/ui/coroutine/static-not-unpin.rs
@@ -4,7 +4,7 @@
 
 #![feature(coroutines, stmt_expr_attributes)]
 
-//@ normalize-stderr-test "std::pin::Unpin" -> "std::marker::Unpin"
+//@ normalize-stderr-test: "std::pin::Unpin" -> "std::marker::Unpin"
 
 use std::marker::Unpin;
 
diff --git a/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-1.rs b/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-1.rs
index 6d70764b9f761..dc68f6cf71f11 100644
--- a/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-1.rs
+++ b/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-1.rs
@@ -4,8 +4,8 @@
 //@ compile-flags:-C debuginfo=2
 //@ build-fail
 //@ error-pattern: too big for the current architecture
-//@ normalize-stderr-64bit "18446744073709551615" -> "SIZE"
-//@ normalize-stderr-32bit "4294967295" -> "SIZE"
+//@ normalize-stderr-64bit: "18446744073709551615" -> "SIZE"
+//@ normalize-stderr-32bit: "4294967295" -> "SIZE"
 
 #![crate_type = "rlib"]
 
diff --git a/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-2.rs b/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-2.rs
index a84dec10abd17..2b6e85362b68c 100644
--- a/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-2.rs
+++ b/tests/ui/debuginfo/debuginfo-type-name-layout-ice-94961-2.rs
@@ -6,8 +6,8 @@
 //@ compile-flags:-C debuginfo=2
 //@ build-fail
 //@ error-pattern: too big for the current architecture
-//@ normalize-stderr-64bit "18446744073709551615" -> "SIZE"
-//@ normalize-stderr-32bit "4294967295" -> "SIZE"
+//@ normalize-stderr-64bit: "18446744073709551615" -> "SIZE"
+//@ normalize-stderr-32bit: "4294967295" -> "SIZE"
 
 #![crate_type = "rlib"]
 
diff --git a/tests/ui/deriving/deriving-in-fn.rs b/tests/ui/deriving/deriving-in-fn.rs
index 72da2148350fd..13f3d39597ce3 100644
--- a/tests/ui/deriving/deriving-in-fn.rs
+++ b/tests/ui/deriving/deriving-in-fn.rs
@@ -9,5 +9,5 @@ pub fn main() {
     }
 
     let f = Foo { foo: 10 };
-    format!("{:?}", f);
+    let _ = format!("{:?}", f);
 }
diff --git a/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.current.stderr b/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.current.stderr
new file mode 100644
index 0000000000000..629fc59361dd2
--- /dev/null
+++ b/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.current.stderr
@@ -0,0 +1,18 @@
+error[E0277]: the trait bound `(): Foo` is not satisfied
+  --> $DIR/supress_suggestions_in_help.rs:23:11
+   |
+LL |     check(());
+   |     ----- ^^ the trait `Foo` is not implemented for `()`
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: the trait `Foo` is implemented for `i32`
+note: required by a bound in `check`
+  --> $DIR/supress_suggestions_in_help.rs:20:18
+   |
+LL | fn check(a: impl Foo) {}
+   |                  ^^^ required by this bound in `check`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.next.stderr b/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.next.stderr
new file mode 100644
index 0000000000000..629fc59361dd2
--- /dev/null
+++ b/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.next.stderr
@@ -0,0 +1,18 @@
+error[E0277]: the trait bound `(): Foo` is not satisfied
+  --> $DIR/supress_suggestions_in_help.rs:23:11
+   |
+LL |     check(());
+   |     ----- ^^ the trait `Foo` is not implemented for `()`
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: the trait `Foo` is implemented for `i32`
+note: required by a bound in `check`
+  --> $DIR/supress_suggestions_in_help.rs:20:18
+   |
+LL | fn check(a: impl Foo) {}
+   |                  ^^^ required by this bound in `check`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.rs b/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.rs
new file mode 100644
index 0000000000000..ef6f255c3518b
--- /dev/null
+++ b/tests/ui/diagnostic_namespace/do_not_recommend/supress_suggestions_in_help.rs
@@ -0,0 +1,25 @@
+//@ revisions: current next
+//@ ignore-compare-mode-next-solver (explicit revisions)
+//@[next] compile-flags: -Znext-solver
+
+#![feature(do_not_recommend)]
+
+trait Foo {}
+
+#[diagnostic::do_not_recommend]
+impl<A> Foo for (A,) {}
+
+#[diagnostic::do_not_recommend]
+impl<A, B> Foo for (A, B) {}
+
+#[diagnostic::do_not_recommend]
+impl<A, B, C> Foo for (A, B, C) {}
+
+impl Foo for i32 {}
+
+fn check(a: impl Foo) {}
+
+fn main() {
+    check(());
+    //~^ ERROR the trait bound `(): Foo` is not satisfied
+}
diff --git a/tests/ui/did_you_mean/issue-40006.rs b/tests/ui/did_you_mean/issue-40006.rs
index 74f304d81a0f1..fff31bfc85e3e 100644
--- a/tests/ui/did_you_mean/issue-40006.rs
+++ b/tests/ui/did_you_mean/issue-40006.rs
@@ -5,7 +5,7 @@ impl dyn A {
 struct S;
 
 trait X {
-    X() {} //~ ERROR expected one of `!` or `::`, found `(`
+    X() {} //~ ERROR missing `fn` for function definition
     fn xxx() { ### }
     L = M;
     Z = { 2 + 3 };
@@ -13,7 +13,7 @@ trait X {
 }
 
 trait A {
-    X() {} //~ ERROR expected one of `!` or `::`, found `(`
+    X() {} //~ ERROR missing `fn` for function definition
 }
 trait B {
     fn xxx() { ### } //~ ERROR expected
diff --git a/tests/ui/did_you_mean/issue-40006.stderr b/tests/ui/did_you_mean/issue-40006.stderr
index bdbfa4dd7136b..303806a14de67 100644
--- a/tests/ui/did_you_mean/issue-40006.stderr
+++ b/tests/ui/did_you_mean/issue-40006.stderr
@@ -11,26 +11,36 @@ LL | }
    | unexpected token
    | the item list ends here
 
-error: expected one of `!` or `::`, found `(`
-  --> $DIR/issue-40006.rs:8:6
+error: missing `fn` for function definition
+  --> $DIR/issue-40006.rs:8:5
    |
 LL | trait X {
    |         - while parsing this item list starting here
 LL |     X() {}
-   |      ^ expected one of `!` or `::`
+   |     ^
 ...
 LL | }
    | - the item list ends here
+   |
+help: add `fn` here to parse `X` as a function
+   |
+LL |     fn X() {}
+   |     ++
 
-error: expected one of `!` or `::`, found `(`
-  --> $DIR/issue-40006.rs:16:6
+error: missing `fn` for function definition
+  --> $DIR/issue-40006.rs:16:5
    |
 LL | trait A {
    |         - while parsing this item list starting here
 LL |     X() {}
-   |      ^ expected one of `!` or `::`
+   |     ^
 LL | }
    | - the item list ends here
+   |
+help: add `fn` here to parse `X` as a function
+   |
+LL |     fn X() {}
+   |     ++
 
 error: expected one of `!` or `[`, found `#`
   --> $DIR/issue-40006.rs:19:17
@@ -69,17 +79,17 @@ LL | }
    | - the item list ends here
 
 error: missing `fn` for method definition
-  --> $DIR/issue-40006.rs:32:8
+  --> $DIR/issue-40006.rs:32:5
    |
 LL | impl S {
    |        - while parsing this item list starting here
 LL |     pub hello_method(&self) {
-   |        ^
+   |     ^^^^^^^^^^^^^^^^
 ...
 LL | }
    | - the item list ends here
    |
-help: add `fn` here to parse `hello_method` as a public method
+help: add `fn` here to parse `hello_method` as a method
    |
 LL |     pub fn hello_method(&self) {
    |         ++
diff --git a/tests/ui/duplicate_entry_error.rs b/tests/ui/duplicate_entry_error.rs
index 8e49f57a3df94..e8b905a65f60d 100644
--- a/tests/ui/duplicate_entry_error.rs
+++ b/tests/ui/duplicate_entry_error.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "loaded from .*libstd-.*.rlib" -> "loaded from SYSROOT/libstd-*.rlib"
+//@ normalize-stderr-test: "loaded from .*libstd-.*.rlib" -> "loaded from SYSROOT/libstd-*.rlib"
 // note-pattern: first defined in crate `std`.
 
 // Test for issue #31788 and E0152
diff --git a/tests/ui/error-codes/E0017.rs b/tests/ui/error-codes/E0017.rs
index 6ba5f9c9a2b71..c046f7859fa09 100644
--- a/tests/ui/error-codes/E0017.rs
+++ b/tests/ui/error-codes/E0017.rs
@@ -1,7 +1,7 @@
 #![feature(const_mut_refs)]
 
-//@ normalize-stderr-test "\(size: ., align: .\)" -> ""
-//@ normalize-stderr-test " +│ ╾─+╼" -> ""
+//@ normalize-stderr-test: "\(size: ., align: .\)" -> ""
+//@ normalize-stderr-test: " +│ ╾─+╼" -> ""
 
 static X: i32 = 1;
 const C: i32 = 2;
diff --git a/tests/ui/error-codes/E0152.rs b/tests/ui/error-codes/E0152.rs
index d56d4e710a405..44d462c27e68f 100644
--- a/tests/ui/error-codes/E0152.rs
+++ b/tests/ui/error-codes/E0152.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "loaded from .*liballoc-.*.rlib" -> "loaded from SYSROOT/liballoc-*.rlib"
+//@ normalize-stderr-test: "loaded from .*liballoc-.*.rlib" -> "loaded from SYSROOT/liballoc-*.rlib"
 #![feature(lang_items)]
 
 #[lang = "owned_box"]
diff --git a/tests/ui/error-codes/E0435.stderr b/tests/ui/error-codes/E0435.stderr
index 68d6ddba2a107..1ebb997639447 100644
--- a/tests/ui/error-codes/E0435.stderr
+++ b/tests/ui/error-codes/E0435.stderr
@@ -1,10 +1,13 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/E0435.rs:5:17
    |
-LL |     let foo: usize = 42;
-   |     ------- help: consider using `const` instead of `let`: `const foo`
 LL |     let _: [u8; foo];
    |                 ^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const foo: usize = 42;
+   |     ~~~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/errors/dynless-turbofish-e0191-issue-91997.rs b/tests/ui/errors/dynless-turbofish-e0191-issue-91997.rs
new file mode 100644
index 0000000000000..69a4c13530bd3
--- /dev/null
+++ b/tests/ui/errors/dynless-turbofish-e0191-issue-91997.rs
@@ -0,0 +1,8 @@
+trait MyIterator : Iterator {}
+
+fn main() {
+    let _ = MyIterator::next;
+}
+//~^^ ERROR the value of the associated type `Item` in `Iterator` must be specified [E0191]
+//~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects]
+//~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
diff --git a/tests/ui/errors/dynless-turbofish-e0191-issue-91997.stderr b/tests/ui/errors/dynless-turbofish-e0191-issue-91997.stderr
new file mode 100644
index 0000000000000..68d8adc5a4013
--- /dev/null
+++ b/tests/ui/errors/dynless-turbofish-e0191-issue-91997.stderr
@@ -0,0 +1,23 @@
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/dynless-turbofish-e0191-issue-91997.rs:4:13
+   |
+LL |     let _ = MyIterator::next;
+   |             ^^^^^^^^^^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+   = note: `#[warn(bare_trait_objects)]` on by default
+help: if this is an object-safe trait, use `dyn`
+   |
+LL |     let _ = <dyn MyIterator>::next;
+   |             ++++           +
+
+error[E0191]: the value of the associated type `Item` in `Iterator` must be specified
+  --> $DIR/dynless-turbofish-e0191-issue-91997.rs:4:13
+   |
+LL |     let _ = MyIterator::next;
+   |             ^^^^^^^^^^ help: specify the associated type: `MyIterator::<Item = Type>`
+
+error: aborting due to 1 previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0191`.
diff --git a/tests/ui/extern/extern-C-non-FFI-safe-arg-ice-52334.rs b/tests/ui/extern/extern-C-non-FFI-safe-arg-ice-52334.rs
index bba7190d43da2..bf060b3d16834 100644
--- a/tests/ui/extern/extern-C-non-FFI-safe-arg-ice-52334.rs
+++ b/tests/ui/extern/extern-C-non-FFI-safe-arg-ice-52334.rs
@@ -1,8 +1,8 @@
 // test for ICE when casting extern "C" fn when it has a non-FFI-safe argument
 // issue: rust-lang/rust#52334
 //@ check-pass
-//@ normalize-stderr-test "\[i8\]" -> "[i8 or u8 (arch dependant)]"
-//@ normalize-stderr-test "\[u8\]" -> "[i8 or u8 (arch dependant)]"
+//@ normalize-stderr-test: "\[i8\]" -> "[i8 or u8 (arch dependant)]"
+//@ normalize-stderr-test: "\[u8\]" -> "[i8 or u8 (arch dependant)]"
 
 type Foo = extern "C" fn(::std::ffi::CStr);
 //~^ WARN `extern` fn uses type
diff --git a/tests/ui/feature-gates/feature-gate-wasm_abi.rs b/tests/ui/feature-gates/feature-gate-wasm_abi.rs
deleted file mode 100644
index da1d9300a2bde..0000000000000
--- a/tests/ui/feature-gates/feature-gate-wasm_abi.rs
+++ /dev/null
@@ -1,26 +0,0 @@
-//@ needs-llvm-components: webassembly
-//@ compile-flags: --target=wasm32-unknown-unknown --crate-type=rlib
-#![no_core]
-#![feature(no_core, lang_items)]
-#[lang="sized"]
-trait Sized { }
-
-extern "wasm" fn fu() {} //~ ERROR wasm ABI is experimental
-
-trait T {
-    extern "wasm" fn mu(); //~ ERROR wasm ABI is experimental
-    extern "wasm" fn dmu() {} //~ ERROR wasm ABI is experimental
-}
-
-struct S;
-impl T for S {
-    extern "wasm" fn mu() {} //~ ERROR wasm ABI is experimental
-}
-
-impl S {
-    extern "wasm" fn imu() {} //~ ERROR wasm ABI is experimental
-}
-
-type TAU = extern "wasm" fn(); //~ ERROR wasm ABI is experimental
-
-extern "wasm" {} //~ ERROR wasm ABI is experimental
diff --git a/tests/ui/feature-gates/feature-gate-wasm_abi.stderr b/tests/ui/feature-gates/feature-gate-wasm_abi.stderr
deleted file mode 100644
index 973c42af19c58..0000000000000
--- a/tests/ui/feature-gates/feature-gate-wasm_abi.stderr
+++ /dev/null
@@ -1,73 +0,0 @@
-error[E0658]: wasm ABI is experimental and subject to change
-  --> $DIR/feature-gate-wasm_abi.rs:8:8
-   |
-LL | extern "wasm" fn fu() {}
-   |        ^^^^^^
-   |
-   = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
-   = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: wasm ABI is experimental and subject to change
-  --> $DIR/feature-gate-wasm_abi.rs:11:12
-   |
-LL |     extern "wasm" fn mu();
-   |            ^^^^^^
-   |
-   = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
-   = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: wasm ABI is experimental and subject to change
-  --> $DIR/feature-gate-wasm_abi.rs:12:12
-   |
-LL |     extern "wasm" fn dmu() {}
-   |            ^^^^^^
-   |
-   = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
-   = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: wasm ABI is experimental and subject to change
-  --> $DIR/feature-gate-wasm_abi.rs:17:12
-   |
-LL |     extern "wasm" fn mu() {}
-   |            ^^^^^^
-   |
-   = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
-   = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: wasm ABI is experimental and subject to change
-  --> $DIR/feature-gate-wasm_abi.rs:21:12
-   |
-LL |     extern "wasm" fn imu() {}
-   |            ^^^^^^
-   |
-   = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
-   = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: wasm ABI is experimental and subject to change
-  --> $DIR/feature-gate-wasm_abi.rs:24:19
-   |
-LL | type TAU = extern "wasm" fn();
-   |                   ^^^^^^
-   |
-   = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
-   = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: wasm ABI is experimental and subject to change
-  --> $DIR/feature-gate-wasm_abi.rs:26:8
-   |
-LL | extern "wasm" {}
-   |        ^^^^^^
-   |
-   = note: see issue #83788 <https://github.com/rust-lang/rust/issues/83788> for more information
-   = help: add `#![feature(wasm_abi)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 7 previous errors
-
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/fmt/struct-field-as-captured-argument.fixed b/tests/ui/fmt/struct-field-as-captured-argument.fixed
index e13af744ec869..0da40737354f7 100644
--- a/tests/ui/fmt/struct-field-as-captured-argument.fixed
+++ b/tests/ui/fmt/struct-field-as-captured-argument.fixed
@@ -8,11 +8,11 @@ struct Foo {
 fn main() {
     let foo = Foo { field: 0 };
     let bar = 3;
-    format!("{0}", foo.field); //~ ERROR invalid format string: field access isn't supported
-    format!("{1} {} {bar}", "aa", foo.field); //~ ERROR invalid format string: field access isn't supported
-    format!("{2} {} {1} {bar}", "aa", "bb", foo.field); //~ ERROR invalid format string: field access isn't supported
-    format!("{1} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
-    format!("{1:?} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
-    format!("{1:#?} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
-    format!("{1:.3} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{0}", foo.field); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{1} {} {bar}", "aa", foo.field); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{2} {} {1} {bar}", "aa", "bb", foo.field); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{1} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{1:?} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{1:#?} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{1:.3} {} {baz}", "aa", foo.field, baz = 3); //~ ERROR invalid format string: field access isn't supported
 }
diff --git a/tests/ui/fmt/struct-field-as-captured-argument.rs b/tests/ui/fmt/struct-field-as-captured-argument.rs
index 6a875a85848f5..325b4e3a21878 100644
--- a/tests/ui/fmt/struct-field-as-captured-argument.rs
+++ b/tests/ui/fmt/struct-field-as-captured-argument.rs
@@ -8,11 +8,11 @@ struct Foo {
 fn main() {
     let foo = Foo { field: 0 };
     let bar = 3;
-    format!("{foo.field}"); //~ ERROR invalid format string: field access isn't supported
-    format!("{foo.field} {} {bar}", "aa"); //~ ERROR invalid format string: field access isn't supported
-    format!("{foo.field} {} {1} {bar}", "aa", "bb"); //~ ERROR invalid format string: field access isn't supported
-    format!("{foo.field} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
-    format!("{foo.field:?} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
-    format!("{foo.field:#?} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
-    format!("{foo.field:.3} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{foo.field}"); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{foo.field} {} {bar}", "aa"); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{foo.field} {} {1} {bar}", "aa", "bb"); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{foo.field} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{foo.field:?} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{foo.field:#?} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
+    let _ = format!("{foo.field:.3} {} {baz}", "aa", baz = 3); //~ ERROR invalid format string: field access isn't supported
 }
diff --git a/tests/ui/fmt/struct-field-as-captured-argument.stderr b/tests/ui/fmt/struct-field-as-captured-argument.stderr
index 7ea8b4068f272..4ef022cecb042 100644
--- a/tests/ui/fmt/struct-field-as-captured-argument.stderr
+++ b/tests/ui/fmt/struct-field-as-captured-argument.stderr
@@ -1,79 +1,79 @@
 error: invalid format string: field access isn't supported
-  --> $DIR/struct-field-as-captured-argument.rs:11:15
+  --> $DIR/struct-field-as-captured-argument.rs:11:23
    |
-LL |     format!("{foo.field}");
-   |               ^^^^^^^^^ not supported in format string
+LL |     let _ = format!("{foo.field}");
+   |                       ^^^^^^^^^ not supported in format string
    |
 help: consider using a positional formatting argument instead
    |
-LL |     format!("{0}", foo.field);
-   |               ~  +++++++++++
+LL |     let _ = format!("{0}", foo.field);
+   |                       ~  +++++++++++
 
 error: invalid format string: field access isn't supported
-  --> $DIR/struct-field-as-captured-argument.rs:12:15
+  --> $DIR/struct-field-as-captured-argument.rs:12:23
    |
-LL |     format!("{foo.field} {} {bar}", "aa");
-   |               ^^^^^^^^^ not supported in format string
+LL |     let _ = format!("{foo.field} {} {bar}", "aa");
+   |                       ^^^^^^^^^ not supported in format string
    |
 help: consider using a positional formatting argument instead
    |
-LL |     format!("{1} {} {bar}", "aa", foo.field);
-   |               ~                 +++++++++++
+LL |     let _ = format!("{1} {} {bar}", "aa", foo.field);
+   |                       ~                 +++++++++++
 
 error: invalid format string: field access isn't supported
-  --> $DIR/struct-field-as-captured-argument.rs:13:15
+  --> $DIR/struct-field-as-captured-argument.rs:13:23
    |
-LL |     format!("{foo.field} {} {1} {bar}", "aa", "bb");
-   |               ^^^^^^^^^ not supported in format string
+LL |     let _ = format!("{foo.field} {} {1} {bar}", "aa", "bb");
+   |                       ^^^^^^^^^ not supported in format string
    |
 help: consider using a positional formatting argument instead
    |
-LL |     format!("{2} {} {1} {bar}", "aa", "bb", foo.field);
-   |               ~                           +++++++++++
+LL |     let _ = format!("{2} {} {1} {bar}", "aa", "bb", foo.field);
+   |                       ~                           +++++++++++
 
 error: invalid format string: field access isn't supported
-  --> $DIR/struct-field-as-captured-argument.rs:14:15
+  --> $DIR/struct-field-as-captured-argument.rs:14:23
    |
-LL |     format!("{foo.field} {} {baz}", "aa", baz = 3);
-   |               ^^^^^^^^^ not supported in format string
+LL |     let _ = format!("{foo.field} {} {baz}", "aa", baz = 3);
+   |                       ^^^^^^^^^ not supported in format string
    |
 help: consider using a positional formatting argument instead
    |
-LL |     format!("{1} {} {baz}", "aa", foo.field, baz = 3);
-   |               ~                 +++++++++++
+LL |     let _ = format!("{1} {} {baz}", "aa", foo.field, baz = 3);
+   |                       ~                 +++++++++++
 
 error: invalid format string: field access isn't supported
-  --> $DIR/struct-field-as-captured-argument.rs:15:15
+  --> $DIR/struct-field-as-captured-argument.rs:15:23
    |
-LL |     format!("{foo.field:?} {} {baz}", "aa", baz = 3);
-   |               ^^^^^^^^^ not supported in format string
+LL |     let _ = format!("{foo.field:?} {} {baz}", "aa", baz = 3);
+   |                       ^^^^^^^^^ not supported in format string
    |
 help: consider using a positional formatting argument instead
    |
-LL |     format!("{1:?} {} {baz}", "aa", foo.field, baz = 3);
-   |               ~                   +++++++++++
+LL |     let _ = format!("{1:?} {} {baz}", "aa", foo.field, baz = 3);
+   |                       ~                   +++++++++++
 
 error: invalid format string: field access isn't supported
-  --> $DIR/struct-field-as-captured-argument.rs:16:15
+  --> $DIR/struct-field-as-captured-argument.rs:16:23
    |
-LL |     format!("{foo.field:#?} {} {baz}", "aa", baz = 3);
-   |               ^^^^^^^^^ not supported in format string
+LL |     let _ = format!("{foo.field:#?} {} {baz}", "aa", baz = 3);
+   |                       ^^^^^^^^^ not supported in format string
    |
 help: consider using a positional formatting argument instead
    |
-LL |     format!("{1:#?} {} {baz}", "aa", foo.field, baz = 3);
-   |               ~                    +++++++++++
+LL |     let _ = format!("{1:#?} {} {baz}", "aa", foo.field, baz = 3);
+   |                       ~                    +++++++++++
 
 error: invalid format string: field access isn't supported
-  --> $DIR/struct-field-as-captured-argument.rs:17:15
+  --> $DIR/struct-field-as-captured-argument.rs:17:23
    |
-LL |     format!("{foo.field:.3} {} {baz}", "aa", baz = 3);
-   |               ^^^^^^^^^ not supported in format string
+LL |     let _ = format!("{foo.field:.3} {} {baz}", "aa", baz = 3);
+   |                       ^^^^^^^^^ not supported in format string
    |
 help: consider using a positional formatting argument instead
    |
-LL |     format!("{1:.3} {} {baz}", "aa", foo.field, baz = 3);
-   |               ~                    +++++++++++
+LL |     let _ = format!("{1:.3} {} {baz}", "aa", foo.field, baz = 3);
+   |                       ~                    +++++++++++
 
 error: aborting due to 7 previous errors
 
diff --git a/tests/ui/generics/generic-function-item-where-type.rs b/tests/ui/generics/generic-function-item-where-type.rs
index 0e36018389e96..e1b0578cadbe9 100644
--- a/tests/ui/generics/generic-function-item-where-type.rs
+++ b/tests/ui/generics/generic-function-item-where-type.rs
@@ -3,5 +3,4 @@ fn foo<U>() {}
 fn main() {
     foo::<main>()
     //~^ ERROR constant provided when a type was expected
-    //~| ERROR type annotations needed
 }
diff --git a/tests/ui/generics/generic-function-item-where-type.stderr b/tests/ui/generics/generic-function-item-where-type.stderr
index 5b0c9a8ee6df5..00e62843cb4b6 100644
--- a/tests/ui/generics/generic-function-item-where-type.stderr
+++ b/tests/ui/generics/generic-function-item-where-type.stderr
@@ -7,13 +7,6 @@ LL |     foo::<main>()
    = help: `main` is a function item, not a type
    = help: function item types cannot be named directly
 
-error[E0282]: type annotations needed
-  --> $DIR/generic-function-item-where-type.rs:4:5
-   |
-LL |     foo::<main>()
-   |     ^^^^^^^^^^^ cannot infer type of the type parameter `U` declared on the function `foo`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0282, E0747.
-For more information about an error, try `rustc --explain E0282`.
+For more information about this error, try `rustc --explain E0747`.
diff --git a/tests/ui/half-open-range-patterns/half-open-range-pats-semantics.rs b/tests/ui/half-open-range-patterns/half-open-range-pats-semantics.rs
index 38ade060cb135..a89b229251287 100644
--- a/tests/ui/half-open-range-patterns/half-open-range-pats-semantics.rs
+++ b/tests/ui/half-open-range-patterns/half-open-range-pats-semantics.rs
@@ -45,9 +45,8 @@ fn range_to_inclusive() {
     // FIXME(f16_f128): remove gate when ABI issues are resolved
     #[cfg(all(target_arch = "aarch64", target_os = "linux"))]
     {
-        // FIXME(f16_f128): enable infinity tests when constants are available
-        // assert!(yes!(f16::NEG_INFINITY, ..=f16::NEG_INFINITY));
-        // assert!(yes!(f16::NEG_INFINITY, ..=1.0f16));
+        assert!(yes!(f16::NEG_INFINITY, ..=f16::NEG_INFINITY));
+        assert!(yes!(f16::NEG_INFINITY, ..=1.0f16));
         assert!(yes!(1.5f16, ..=1.5f16));
         assert!(!yes!(1.6f16, ..=-1.5f16));
     }
@@ -68,9 +67,8 @@ fn range_to_inclusive() {
     // FIXME(f16_f128): remove gate when ABI issues are resolved
     #[cfg(all(target_arch = "aarch64", target_os = "linux"))]
     {
-        // FIXME(f16_f128): enable infinity tests when constants are available
-        // assert!(yes!(f128::NEG_INFINITY, ..=f128::NEG_INFINITY));
-        // assert!(yes!(f128::NEG_INFINITY, ..=1.0f128));
+        assert!(yes!(f128::NEG_INFINITY, ..=f128::NEG_INFINITY));
+        assert!(yes!(f128::NEG_INFINITY, ..=1.0f128));
         assert!(yes!(1.5f128, ..=1.5f128));
         assert!(!yes!(1.6f128, ..=-1.5f128));
     }
@@ -111,8 +109,7 @@ fn range_to() {
     // FIXME(f16_f128): remove gate when ABI issues are resolved
     #[cfg(all(target_arch = "aarch64", target_os = "linux"))]
     {
-        // FIXME(f16_f128): enable infinity tests when constants are available
-        // assert!(yes!(f16::NEG_INFINITY, ..1.0f16));
+        assert!(yes!(f16::NEG_INFINITY, ..1.0f16));
         assert!(!yes!(1.5f16, ..1.5f16));
         const E16: f16 = 1.5f16 + f16::EPSILON;
         assert!(yes!(1.5f16, ..E16));
@@ -137,8 +134,7 @@ fn range_to() {
     // FIXME(f16_f128): remove gate when ABI issues are resolved
     #[cfg(all(target_arch = "aarch64", target_os = "linux"))]
     {
-        // FIXME(f16_f128): enable infinity tests when constants are available
-        // assert!(yes!(f128::NEG_INFINITY, ..1.0f128));
+        assert!(yes!(f128::NEG_INFINITY, ..1.0f128));
         assert!(!yes!(1.5f128, ..1.5f128));
         const E128: f128 = 1.5f128 + f128::EPSILON;
         assert!(yes!(1.5f128, ..E128));
@@ -181,15 +177,14 @@ fn range_from() {
     // FIXME(f16_f128): remove gate when ABI issues are resolved
     #[cfg(all(target_arch = "aarch64", target_os = "linux"))]
     {
-        // FIXME(f16_f128): enable infinity tests when constants are available
-        // assert!(yes!(f16::NEG_INFINITY, f16::NEG_INFINITY..));
-        // assert!(yes!(f16::INFINITY, f16::NEG_INFINITY..));
-        // assert!(!yes!(f16::NEG_INFINITY, 1.0f16..));
-        // assert!(yes!(f16::INFINITY, 1.0f16..));
+        assert!(yes!(f16::NEG_INFINITY, f16::NEG_INFINITY..));
+        assert!(yes!(f16::INFINITY, f16::NEG_INFINITY..));
+        assert!(!yes!(f16::NEG_INFINITY, 1.0f16..));
+        assert!(yes!(f16::INFINITY, 1.0f16..));
         assert!(!yes!(1.0f16 - f16::EPSILON, 1.0f16..));
         assert!(yes!(1.0f16, 1.0f16..));
-        // assert!(yes!(f16::INFINITY, 1.0f16..));
-        // assert!(yes!(f16::INFINITY, f16::INFINITY..));
+        assert!(yes!(f16::INFINITY, 1.0f16..));
+        assert!(yes!(f16::INFINITY, f16::INFINITY..));
     }
 
     // f32; `X..`
@@ -216,15 +211,14 @@ fn range_from() {
     // FIXME(f16_f128): remove gate when ABI issues are resolved
     #[cfg(all(target_arch = "aarch64", target_os = "linux"))]
     {
-        // FIXME(f16_f128): enable infinity tests when constants are available
-        // assert!(yes!(f128::NEG_INFINITY, f128::NEG_INFINITY..));
-        // assert!(yes!(f128::INFINITY, f128::NEG_INFINITY..));
-        // assert!(!yes!(f128::NEG_INFINITY, 1.0f128..));
-        // assert!(yes!(f128::INFINITY, 1.0f128..));
+        assert!(yes!(f128::NEG_INFINITY, f128::NEG_INFINITY..));
+        assert!(yes!(f128::INFINITY, f128::NEG_INFINITY..));
+        assert!(!yes!(f128::NEG_INFINITY, 1.0f128..));
+        assert!(yes!(f128::INFINITY, 1.0f128..));
         assert!(!yes!(1.0f128 - f128::EPSILON, 1.0f128..));
         assert!(yes!(1.0f128, 1.0f128..));
-        // assert!(yes!(f128::INFINITY, 1.0f128..));
-        // assert!(yes!(f128::INFINITY, f128::INFINITY..));
+        assert!(yes!(f128::INFINITY, 1.0f128..));
+        assert!(yes!(f128::INFINITY, f128::INFINITY..));
     }
 }
 
diff --git a/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.rs b/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.rs
index a35bb51acbca3..6a0115de01605 100644
--- a/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.rs
+++ b/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.rs
@@ -1,3 +1,6 @@
+#![feature(f128)]
+#![feature(f16)]
+
 macro_rules! m {
     ($s:expr, $($t:tt)+) => {
         match $s { $($t)+ => {} }
@@ -27,11 +30,14 @@ fn main() {
     m!(0, ..i128::MIN);
     //~^ ERROR lower range bound must be less than upper
 
-    // FIXME(f16_f128): add tests when NEG_INFINITY is available
+    m!(0f16, ..f16::NEG_INFINITY);
+    //~^ ERROR lower range bound must be less than upper
     m!(0f32, ..f32::NEG_INFINITY);
     //~^ ERROR lower range bound must be less than upper
     m!(0f64, ..f64::NEG_INFINITY);
     //~^ ERROR lower range bound must be less than upper
+    m!(0f128, ..f128::NEG_INFINITY);
+    //~^ ERROR lower range bound must be less than upper
 
     m!('a', ..'\u{0}');
     //~^ ERROR lower range bound must be less than upper
diff --git a/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.stderr b/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.stderr
index fb2f1841a6dfc..f414a6bfd1830 100644
--- a/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.stderr
+++ b/tests/ui/half-open-range-patterns/half-open-range-pats-thir-lower-empty.stderr
@@ -1,81 +1,93 @@
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:8:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:11:11
    |
 LL |     m!(0, ..u8::MIN);
    |           ^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:10:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:13:11
    |
 LL |     m!(0, ..u16::MIN);
    |           ^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:12:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:15:11
    |
 LL |     m!(0, ..u32::MIN);
    |           ^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:14:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:17:11
    |
 LL |     m!(0, ..u64::MIN);
    |           ^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:16:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:19:11
    |
 LL |     m!(0, ..u128::MIN);
    |           ^^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:19:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:22:11
    |
 LL |     m!(0, ..i8::MIN);
    |           ^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:21:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:24:11
    |
 LL |     m!(0, ..i16::MIN);
    |           ^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:23:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:26:11
    |
 LL |     m!(0, ..i32::MIN);
    |           ^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:25:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:28:11
    |
 LL |     m!(0, ..i64::MIN);
    |           ^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:27:11
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:30:11
    |
 LL |     m!(0, ..i128::MIN);
    |           ^^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:31:14
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:33:14
+   |
+LL |     m!(0f16, ..f16::NEG_INFINITY);
+   |              ^^^^^^^^^^^^^^^^^^^
+
+error[E0579]: lower range bound must be less than upper
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:35:14
    |
 LL |     m!(0f32, ..f32::NEG_INFINITY);
    |              ^^^^^^^^^^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:33:14
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:37:14
    |
 LL |     m!(0f64, ..f64::NEG_INFINITY);
    |              ^^^^^^^^^^^^^^^^^^^
 
 error[E0579]: lower range bound must be less than upper
-  --> $DIR/half-open-range-pats-thir-lower-empty.rs:36:13
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:39:15
+   |
+LL |     m!(0f128, ..f128::NEG_INFINITY);
+   |               ^^^^^^^^^^^^^^^^^^^^
+
+error[E0579]: lower range bound must be less than upper
+  --> $DIR/half-open-range-pats-thir-lower-empty.rs:42:13
    |
 LL |     m!('a', ..'\u{0}');
    |             ^^^^^^^^^
 
-error: aborting due to 13 previous errors
+error: aborting due to 15 previous errors
 
 For more information about this error, try `rustc --explain E0579`.
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.next.stderr b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.next.stderr
new file mode 100644
index 0000000000000..90391b7b86b5c
--- /dev/null
+++ b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.next.stderr
@@ -0,0 +1,23 @@
+error[E0277]: the trait bound `for<'a> &'a &T: Trait` is not satisfied
+  --> $DIR/candidate-from-env-universe-err-1.rs:27:16
+   |
+LL |     hr_bound::<&T>();
+   |                ^^ the trait `for<'a> Trait` is not implemented for `&'a &T`
+   |
+note: required by a bound in `hr_bound`
+  --> $DIR/candidate-from-env-universe-err-1.rs:14:20
+   |
+LL | fn hr_bound<T>()
+   |    -------- required by a bound in this function
+LL | where
+LL |     for<'a> &'a T: Trait,
+   |                    ^^^^^ required by this bound in `hr_bound`
+help: consider removing the leading `&`-reference
+   |
+LL -     hr_bound::<&T>();
+LL +     hr_bound::<T>();
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.rs b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.rs
index b448f0bdc7778..bd251216162db 100644
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.rs
+++ b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.rs
@@ -1,3 +1,7 @@
+//@ revisions: old next
+//@[next] compile-flags: -Znext-solver
+//@[old] check-pass
+
 // cc #119820
 
 trait Trait {}
@@ -21,8 +25,7 @@ where
     // the leak check both candidates may apply and we prefer the
     // `param_env` candidate in winnowing.
     hr_bound::<&T>();
-    //~^ ERROR the parameter type `T` may not live long enough
-    //~| ERROR implementation of `Trait` is not general enough
+    //[next]~^ ERROR the trait bound `for<'a> &'a &T: Trait` is not satisfied
 }
 
 fn main() {}
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.stderr b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.stderr
deleted file mode 100644
index febe252d7d1d5..0000000000000
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-1.stderr
+++ /dev/null
@@ -1,26 +0,0 @@
-error[E0310]: the parameter type `T` may not live long enough
-  --> $DIR/candidate-from-env-universe-err-1.rs:23:5
-   |
-LL |     hr_bound::<&T>();
-   |     ^^^^^^^^^^^^^^
-   |     |
-   |     the parameter type `T` must be valid for the static lifetime...
-   |     ...so that the type `T` will meet its required lifetime bounds
-   |
-help: consider adding an explicit lifetime bound
-   |
-LL |     T: Trait + 'static,
-   |              +++++++++
-
-error: implementation of `Trait` is not general enough
-  --> $DIR/candidate-from-env-universe-err-1.rs:23:5
-   |
-LL |     hr_bound::<&T>();
-   |     ^^^^^^^^^^^^^^ implementation of `Trait` is not general enough
-   |
-   = note: `Trait` would have to be implemented for the type `&'0 &T`, for any lifetime `'0`...
-   = note: ...but `Trait` is actually implemented for the type `&'1 &'1 T`, for some specific lifetime `'1`
-
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0310`.
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.current.stderr b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.current.stderr
deleted file mode 100644
index 22ce87c024861..0000000000000
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.current.stderr
+++ /dev/null
@@ -1,25 +0,0 @@
-error: lifetime may not live long enough
-  --> $DIR/candidate-from-env-universe-err-2.rs:14:5
-   |
-LL | fn not_hr<'a, T: for<'b> Trait<'a, 'b> + OtherTrait<'static>>() {
-   |           -- lifetime `'a` defined here
-LL |     impl_hr::<T>();
-   |     ^^^^^^^^^^^^ requires that `'a` must outlive `'static`
-   |
-note: due to current limitations in the borrow checker, this implies a `'static` lifetime
-  --> $DIR/candidate-from-env-universe-err-2.rs:11:19
-   |
-LL | fn impl_hr<'b, T: for<'a> Trait<'a, 'b>>() {}
-   |                   ^^^^^^^^^^^^^^^^^^^^^
-
-error: implementation of `Trait` is not general enough
-  --> $DIR/candidate-from-env-universe-err-2.rs:14:5
-   |
-LL |     impl_hr::<T>();
-   |     ^^^^^^^^^^^^ implementation of `Trait` is not general enough
-   |
-   = note: `T` must implement `Trait<'0, '_>`, for any lifetime `'0`...
-   = note: ...but it actually implements `Trait<'1, '_>`, for some specific lifetime `'1`
-
-error: aborting due to 2 previous errors
-
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.next.stderr b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.next.stderr
index a61bc748bea2d..8771de85c192e 100644
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.next.stderr
+++ b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.next.stderr
@@ -1,11 +1,11 @@
 error[E0277]: the trait bound `for<'a> T: Trait<'a, '_>` is not satisfied
-  --> $DIR/candidate-from-env-universe-err-2.rs:14:5
+  --> $DIR/candidate-from-env-universe-err-2.rs:15:5
    |
 LL |     impl_hr::<T>();
    |     ^^^^^^^^^^^^^^ the trait `for<'a> Trait<'a, '_>` is not implemented for `T`
    |
 note: required by a bound in `impl_hr`
-  --> $DIR/candidate-from-env-universe-err-2.rs:11:19
+  --> $DIR/candidate-from-env-universe-err-2.rs:12:19
    |
 LL | fn impl_hr<'b, T: for<'a> Trait<'a, 'b>>() {}
    |                   ^^^^^^^^^^^^^^^^^^^^^ required by this bound in `impl_hr`
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.old.stderr b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.old.stderr
deleted file mode 100644
index 29a72b1c1b641..0000000000000
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.old.stderr
+++ /dev/null
@@ -1,26 +0,0 @@
-error: lifetime may not live long enough
-  --> $DIR/candidate-from-env-universe-err-2.rs:14:5
-   |
-LL | fn not_hr<'a, T: for<'b> Trait<'a, 'b> + OtherTrait<'static>>() {
-   |           -- lifetime `'a` defined here
-LL |     impl_hr::<T>();
-   |     ^^^^^^^^^^^^ requires that `'a` must outlive `'static`
-   |
-note: due to current limitations in the borrow checker, this implies a `'static` lifetime
-  --> $DIR/candidate-from-env-universe-err-2.rs:11:19
-   |
-LL | fn impl_hr<'b, T: for<'a> Trait<'a, 'b>>() {}
-   |                   ^^^^^^^^^^^^^^^^^^^^^
-
-error[E0308]: mismatched types
-  --> $DIR/candidate-from-env-universe-err-2.rs:14:5
-   |
-LL |     impl_hr::<T>();
-   |     ^^^^^^^^^^^^ one type is more general than the other
-   |
-   = note: expected trait `for<'a> Trait<'a, '_>`
-              found trait `for<'b> Trait<'_, 'b>`
-
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.rs b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.rs
index 56fa70469ccf8..0132b7db60574 100644
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.rs
+++ b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-2.rs
@@ -1,5 +1,6 @@
 //@ revisions: current next
 //@[next] compile-flags: -Znext-solver
+//@[current] check-pass
 
 // cc #119820
 
@@ -13,8 +14,6 @@ fn impl_hr<'b, T: for<'a> Trait<'a, 'b>>() {}
 fn not_hr<'a, T: for<'b> Trait<'a, 'b> + OtherTrait<'static>>() {
     impl_hr::<T>();
     //[next]~^ ERROR the trait bound `for<'a> T: Trait<'a, '_>` is not satisfied
-    //[current]~^^ERROR lifetime may not live long enough
-    //[current]~| ERROR implementation of `Trait` is not general enough
 }
 
 fn main() {}
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.current.stderr b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.current.stderr
index bb0b2de788e83..7b9fd6bb4c571 100644
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.current.stderr
+++ b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.current.stderr
@@ -1,23 +1,5 @@
-error: implementation of `Trait` is not general enough
-  --> $DIR/candidate-from-env-universe-err-project.rs:28:5
-   |
-LL |     trait_bound::<T>();
-   |     ^^^^^^^^^^^^^^^^^^ implementation of `Trait` is not general enough
-   |
-   = note: `T` must implement `Trait<'0>`, for any lifetime `'0`...
-   = note: ...but it actually implements `Trait<'static>`
-
-error: implementation of `Trait` is not general enough
-  --> $DIR/candidate-from-env-universe-err-project.rs:39:5
-   |
-LL |     projection_bound::<T>();
-   |     ^^^^^^^^^^^^^^^^^^^^^^^ implementation of `Trait` is not general enough
-   |
-   = note: `T` must implement `Trait<'0>`, for any lifetime `'0`...
-   = note: ...but it actually implements `Trait<'static>`
-
 error[E0308]: mismatched types
-  --> $DIR/candidate-from-env-universe-err-project.rs:39:5
+  --> $DIR/candidate-from-env-universe-err-project.rs:38:5
    |
 LL |     projection_bound::<T>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
@@ -31,7 +13,7 @@ LL | fn projection_bound<T: for<'a> Trait<'a, Assoc = usize>>() {}
    |                                          ^^^^^^^^^^^^^
 
 error[E0308]: mismatched types
-  --> $DIR/candidate-from-env-universe-err-project.rs:55:30
+  --> $DIR/candidate-from-env-universe-err-project.rs:53:30
    |
 LL |     let _higher_ranked_norm: for<'a> fn(<T as Trait<'a>>::Assoc) = |_| ();
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
@@ -40,7 +22,7 @@ LL |     let _higher_ranked_norm: for<'a> fn(<T as Trait<'a>>::Assoc) = |_| ();
               found associated type `<T as Trait<'a>>::Assoc`
 
 error[E0308]: mismatched types
-  --> $DIR/candidate-from-env-universe-err-project.rs:55:30
+  --> $DIR/candidate-from-env-universe-err-project.rs:53:30
    |
 LL |     let _higher_ranked_norm: for<'a> fn(<T as Trait<'a>>::Assoc) = |_| ();
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
@@ -49,6 +31,6 @@ LL |     let _higher_ranked_norm: for<'a> fn(<T as Trait<'a>>::Assoc) = |_| ();
               found associated type `<T as Trait<'a>>::Assoc`
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
-error: aborting due to 5 previous errors
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.next.stderr b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.next.stderr
index 2804d5bbe9408..90df487c07e7f 100644
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.next.stderr
+++ b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.next.stderr
@@ -15,7 +15,7 @@ LL | fn function1<T: Trait<'static> + for<'a> Trait<'a>>() {
    |                                +++++++++++++++++++
 
 error[E0277]: the trait bound `for<'a> T: Trait<'a>` is not satisfied
-  --> $DIR/candidate-from-env-universe-err-project.rs:39:24
+  --> $DIR/candidate-from-env-universe-err-project.rs:38:24
    |
 LL |     projection_bound::<T>();
    |                        ^ the trait `for<'a> Trait<'a>` is not implemented for `T`
@@ -31,7 +31,7 @@ LL | fn function2<T: Trait<'static, Assoc = usize> + for<'a> Trait<'a>>() {
    |                                               +++++++++++++++++++
 
 error[E0271]: type mismatch resolving `<T as Trait<'a>>::Assoc == usize`
-  --> $DIR/candidate-from-env-universe-err-project.rs:39:24
+  --> $DIR/candidate-from-env-universe-err-project.rs:38:24
    |
 LL |     projection_bound::<T>();
    |                        ^ type mismatch resolving `<T as Trait<'a>>::Assoc == usize`
@@ -48,13 +48,13 @@ LL | fn projection_bound<T: for<'a> Trait<'a, Assoc = usize>>() {}
    |                                          ^^^^^^^^^^^^^ required by this bound in `projection_bound`
 
 error: higher-ranked subtype error
-  --> $DIR/candidate-from-env-universe-err-project.rs:55:30
+  --> $DIR/candidate-from-env-universe-err-project.rs:53:30
    |
 LL |     let _higher_ranked_norm: for<'a> fn(<T as Trait<'a>>::Assoc) = |_| ();
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: higher-ranked subtype error
-  --> $DIR/candidate-from-env-universe-err-project.rs:55:30
+  --> $DIR/candidate-from-env-universe-err-project.rs:53:30
    |
 LL |     let _higher_ranked_norm: for<'a> fn(<T as Trait<'a>>::Assoc) = |_| ();
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.rs b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.rs
index e0d2e44e6e7d8..a77d87f6fa78e 100644
--- a/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.rs
+++ b/tests/ui/higher-ranked/leak-check/candidate-from-env-universe-err-project.rs
@@ -1,8 +1,8 @@
 //@ revisions: next current
 //@[next] compile-flags: -Znext-solver
 
-// cc #119820 the previous behavior here was inconsistent as we discarded
-// the where-bound candidate for trait goals due to the leak check, but did
+// cc #119820 the behavior is inconsistent as we discard the where-bound
+// candidate for trait goals due to the leak check, but did
 // not do so for projection candidates and during normalization.
 //
 // This results in an inconsistency between `Trait` and `Projection` goals as
@@ -27,7 +27,6 @@ fn function1<T: Trait<'static>>() {
     // We prefer env candidates over impl candidatescausing this to succeed.
     trait_bound::<T>();
     //[next]~^ ERROR the trait bound `for<'a> T: Trait<'a>` is not satisfied
-    //[current]~^^ ERROR implementation of `Trait` is not general enough
 }
 
 fn function2<T: Trait<'static, Assoc = usize>>() {
@@ -39,8 +38,7 @@ fn function2<T: Trait<'static, Assoc = usize>>() {
     projection_bound::<T>();
     //[next]~^ ERROR type mismatch resolving `<T as Trait<'a>>::Assoc == usize`
     //[next]~| ERROR the trait bound `for<'a> T: Trait<'a>` is not satisfied
-    //[current]~^^^ ERROR implementation of `Trait` is not general enough
-    //[current]~| ERROR mismatched types
+    //[current]~^^^ ERROR mismatched types
 }
 
 fn function3<T: Trait<'static, Assoc = usize>>() {
diff --git a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.next.stderr b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.next.stderr
index a840304e49c1f..cb97bc4b8fc6e 100644
--- a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.next.stderr
+++ b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.next.stderr
@@ -1,11 +1,11 @@
 error[E0283]: type annotations needed
-  --> $DIR/leak-check-in-selection-2.rs:16:5
+  --> $DIR/leak-check-in-selection-2.rs:17:5
    |
 LL |     impls_trait::<(), _>();
    |     ^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `U` declared on the function `impls_trait`
    |
 note: multiple `impl`s satisfying `for<'a> (): Trait<&'a str, _>` found
-  --> $DIR/leak-check-in-selection-2.rs:9:1
+  --> $DIR/leak-check-in-selection-2.rs:10:1
    |
 LL | impl<'a> Trait<&'a str, &'a str> for () {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -13,7 +13,7 @@ LL |
 LL | impl<'a> Trait<&'a str, String> for () {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: required by a bound in `impls_trait`
-  --> $DIR/leak-check-in-selection-2.rs:13:19
+  --> $DIR/leak-check-in-selection-2.rs:14:19
    |
 LL | fn impls_trait<T: for<'a> Trait<&'a str, U>, U>() {}
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `impls_trait`
diff --git a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.old.stderr b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.old.stderr
deleted file mode 100644
index a840304e49c1f..0000000000000
--- a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.old.stderr
+++ /dev/null
@@ -1,23 +0,0 @@
-error[E0283]: type annotations needed
-  --> $DIR/leak-check-in-selection-2.rs:16:5
-   |
-LL |     impls_trait::<(), _>();
-   |     ^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `U` declared on the function `impls_trait`
-   |
-note: multiple `impl`s satisfying `for<'a> (): Trait<&'a str, _>` found
-  --> $DIR/leak-check-in-selection-2.rs:9:1
-   |
-LL | impl<'a> Trait<&'a str, &'a str> for () {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-LL |
-LL | impl<'a> Trait<&'a str, String> for () {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-note: required by a bound in `impls_trait`
-  --> $DIR/leak-check-in-selection-2.rs:13:19
-   |
-LL | fn impls_trait<T: for<'a> Trait<&'a str, U>, U>() {}
-   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `impls_trait`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0283`.
diff --git a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.rs b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.rs
index 48dd569f201b9..24e38ec45a2c4 100644
--- a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.rs
+++ b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-2.rs
@@ -1,5 +1,6 @@
 //@ revisions: old next
 //@[next] compile-flags: -Znext-solver
+//@[old] check-pass
 
 // cc #119820
 
@@ -14,5 +15,5 @@ fn impls_trait<T: for<'a> Trait<&'a str, U>, U>() {}
 
 fn main() {
     impls_trait::<(), _>();
-    //~^ ERROR type annotations needed
+    //[next]~^ ERROR type annotations needed
 }
diff --git a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.old.stderr b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.old.stderr
index 662a06537401a..194571dd4a85b 100644
--- a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.old.stderr
+++ b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.old.stderr
@@ -1,22 +1,3 @@
-error[E0283]: type annotations needed
-  --> $DIR/leak-check-in-selection-3.rs:18:5
-   |
-LL |     impls_leak::<Box<_>>();
-   |     ^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `T` declared on the function `impls_leak`
-   |
-note: multiple `impl`s satisfying `for<'a> Box<_>: Leak<'a>` found
-  --> $DIR/leak-check-in-selection-3.rs:9:1
-   |
-LL | impl Leak<'_> for Box<u32> {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
-LL | impl Leak<'static> for Box<u16> {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-note: required by a bound in `impls_leak`
-  --> $DIR/leak-check-in-selection-3.rs:12:18
-   |
-LL | fn impls_leak<T: for<'a> Leak<'a>>() {}
-   |                  ^^^^^^^^^^^^^^^^ required by this bound in `impls_leak`
-
 error[E0283]: type annotations needed
   --> $DIR/leak-check-in-selection-3.rs:35:5
    |
@@ -43,6 +24,6 @@ note: required by a bound in `impls_indirect_leak`
 LL | fn impls_indirect_leak<T: for<'a> IndirectLeak<'a>>() {}
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `impls_indirect_leak`
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0283`.
diff --git a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.rs b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.rs
index 9e99b6c527d9d..9aa1be57a4fb2 100644
--- a/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.rs
+++ b/tests/ui/higher-ranked/leak-check/leak-check-in-selection-3.rs
@@ -1,9 +1,9 @@
 //@ revisions: old next
 //@[next] compile-flags: -Znext-solver
 
-// cc #119820, the previous behavior here was inconsistent,
+// cc #119820, the behavior here is  inconsistent,
 // using the leak check to guide inference for `for<'a> Box<_>: Leak<'a>`
-// but not for `for<'a> Box<_>: IndirectLeak<'a>`
+// but not for `for<'a> Box<_>: IndirectLeak<'a>`.
 
 trait Leak<'a> {}
 impl Leak<'_> for Box<u32> {}
@@ -16,7 +16,7 @@ fn direct() {
     // The `Box<u16>` impls fails the leak check,
     // meaning that we apply the `Box<u32>` impl.
     impls_leak::<Box<_>>();
-    //~^ ERROR type annotations needed
+    //[next]~^ ERROR type annotations needed
 }
 
 trait IndirectLeak<'a> {}
diff --git a/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits-transitive.stderr b/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits-transitive.stderr
index be19bf85bd2f3..e10da26665ebb 100644
--- a/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits-transitive.stderr
+++ b/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits-transitive.stderr
@@ -1,11 +1,23 @@
-error: implementation of `Bar` is not general enough
-  --> $DIR/hrtb-higher-ranker-supertraits-transitive.rs:47:5
+error[E0277]: the trait bound `for<'ccx> B: Bar<'ccx>` is not satisfied
+  --> $DIR/hrtb-higher-ranker-supertraits-transitive.rs:47:26
    |
 LL |     want_bar_for_any_ccx(b);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^ implementation of `Bar` is not general enough
+   |     -------------------- ^ the trait `for<'ccx> Bar<'ccx>` is not implemented for `B`
+   |     |
+   |     required by a bound introduced by this call
    |
-   = note: `B` must implement `Bar<'0>`, for any lifetime `'0`...
-   = note: ...but it actually implements `Bar<'static>`
+note: required by a bound in `want_bar_for_any_ccx`
+  --> $DIR/hrtb-higher-ranker-supertraits-transitive.rs:32:15
+   |
+LL | fn want_bar_for_any_ccx<B>(b: &B)
+   |    -------------------- required by a bound in this function
+LL |     where B : for<'ccx> Bar<'ccx>
+   |               ^^^^^^^^^^^^^^^^^^^ required by this bound in `want_bar_for_any_ccx`
+help: consider further restricting this bound
+   |
+LL |     where B : Qux + for<'ccx> Bar<'ccx>
+   |                   +++++++++++++++++++++
 
 error: aborting due to 1 previous error
 
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.rs b/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.rs
index 70ce580258d43..7e2ecc937bd0d 100644
--- a/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.rs
+++ b/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.rs
@@ -12,8 +12,7 @@ trait Bar<'ccx>: for<'tcx> Foo<'tcx> {
 fn want_foo_for_some_tcx<'x, F: Foo<'x>>(f: &'x F) {
     want_foo_for_some_tcx(f);
     want_foo_for_any_tcx(f);
-    //~^ ERROR lifetime may not live long enough
-    //~| ERROR implementation of `Foo` is not general enough
+    //~^ ERROR the trait bound `for<'tcx> F: Foo<'tcx>` is not satisfied
 }
 
 fn want_foo_for_any_tcx<F: for<'tcx> Foo<'tcx>>(f: &F) {
@@ -27,8 +26,7 @@ fn want_bar_for_some_ccx<'x, B: Bar<'x>>(b: &B) {
 
     want_bar_for_some_ccx(b);
     want_bar_for_any_ccx(b);
-    //~^ ERROR lifetime may not live long enough
-    //~| ERROR implementation of `Bar` is not general enough
+    //~^ ERROR the trait bound `for<'ccx> B: Bar<'ccx>` is not satisfied
 }
 
 fn want_bar_for_any_ccx<B: for<'ccx> Bar<'ccx>>(b: &B) {
diff --git a/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.stderr b/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.stderr
index dd760926ea117..af76377de8500 100644
--- a/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.stderr
+++ b/tests/ui/higher-ranked/trait-bounds/hrtb-higher-ranker-supertraits.stderr
@@ -1,50 +1,39 @@
-error: lifetime may not live long enough
-  --> $DIR/hrtb-higher-ranker-supertraits.rs:14:5
+error[E0277]: the trait bound `for<'tcx> F: Foo<'tcx>` is not satisfied
+  --> $DIR/hrtb-higher-ranker-supertraits.rs:14:26
    |
-LL | fn want_foo_for_some_tcx<'x, F: Foo<'x>>(f: &'x F) {
-   |                          -- lifetime `'x` defined here
-LL |     want_foo_for_some_tcx(f);
 LL |     want_foo_for_any_tcx(f);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^ requires that `'x` must outlive `'static`
+   |     -------------------- ^ the trait `for<'tcx> Foo<'tcx>` is not implemented for `F`
+   |     |
+   |     required by a bound introduced by this call
    |
-note: due to current limitations in the borrow checker, this implies a `'static` lifetime
-  --> $DIR/hrtb-higher-ranker-supertraits.rs:19:28
+note: required by a bound in `want_foo_for_any_tcx`
+  --> $DIR/hrtb-higher-ranker-supertraits.rs:18:28
    |
 LL | fn want_foo_for_any_tcx<F: for<'tcx> Foo<'tcx>>(f: &F) {
-   |                            ^^^^^^^^^^^^^^^^^^^
-
-error: implementation of `Foo` is not general enough
-  --> $DIR/hrtb-higher-ranker-supertraits.rs:14:5
-   |
-LL |     want_foo_for_any_tcx(f);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^ implementation of `Foo` is not general enough
+   |                            ^^^^^^^^^^^^^^^^^^^ required by this bound in `want_foo_for_any_tcx`
+help: consider further restricting this bound
    |
-   = note: `F` must implement `Foo<'0>`, for any lifetime `'0`...
-   = note: ...but it actually implements `Foo<'1>`, for some specific lifetime `'1`
+LL | fn want_foo_for_some_tcx<'x, F: Foo<'x> + for<'tcx> Foo<'tcx>>(f: &'x F) {
+   |                                         +++++++++++++++++++++
 
-error: lifetime may not live long enough
-  --> $DIR/hrtb-higher-ranker-supertraits.rs:29:5
+error[E0277]: the trait bound `for<'ccx> B: Bar<'ccx>` is not satisfied
+  --> $DIR/hrtb-higher-ranker-supertraits.rs:28:26
    |
-LL | fn want_bar_for_some_ccx<'x, B: Bar<'x>>(b: &B) {
-   |                          -- lifetime `'x` defined here
-...
 LL |     want_bar_for_any_ccx(b);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^ requires that `'x` must outlive `'static`
+   |     -------------------- ^ the trait `for<'ccx> Bar<'ccx>` is not implemented for `B`
+   |     |
+   |     required by a bound introduced by this call
    |
-note: due to current limitations in the borrow checker, this implies a `'static` lifetime
-  --> $DIR/hrtb-higher-ranker-supertraits.rs:34:28
+note: required by a bound in `want_bar_for_any_ccx`
+  --> $DIR/hrtb-higher-ranker-supertraits.rs:32:28
    |
 LL | fn want_bar_for_any_ccx<B: for<'ccx> Bar<'ccx>>(b: &B) {
-   |                            ^^^^^^^^^^^^^^^^^^^
-
-error: implementation of `Bar` is not general enough
-  --> $DIR/hrtb-higher-ranker-supertraits.rs:29:5
-   |
-LL |     want_bar_for_any_ccx(b);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^ implementation of `Bar` is not general enough
+   |                            ^^^^^^^^^^^^^^^^^^^ required by this bound in `want_bar_for_any_ccx`
+help: consider further restricting this bound
    |
-   = note: `B` must implement `Bar<'0>`, for any lifetime `'0`...
-   = note: ...but it actually implements `Bar<'1>`, for some specific lifetime `'1`
+LL | fn want_bar_for_some_ccx<'x, B: Bar<'x> + for<'ccx> Bar<'ccx>>(b: &B) {
+   |                                         +++++++++++++++++++++
 
-error: aborting due to 4 previous errors
+error: aborting due to 2 previous errors
 
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/hygiene/panic-location.rs b/tests/ui/hygiene/panic-location.rs
index b2f9bfe4f9a7a..7b20f1683a976 100644
--- a/tests/ui/hygiene/panic-location.rs
+++ b/tests/ui/hygiene/panic-location.rs
@@ -1,7 +1,7 @@
 //@ run-fail
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 //
 // Regression test for issue #70963
 // The captured stderr from this test reports a location
diff --git a/tests/ui/hygiene/unpretty-debug.rs b/tests/ui/hygiene/unpretty-debug.rs
index 20c909b1cbee7..8e05d60e2184a 100644
--- a/tests/ui/hygiene/unpretty-debug.rs
+++ b/tests/ui/hygiene/unpretty-debug.rs
@@ -2,7 +2,7 @@
 //@ compile-flags: -Zunpretty=expanded,hygiene
 
 // Don't break whenever Symbol numbering changes
-//@ normalize-stdout-test "\d+#" -> "0#"
+//@ normalize-stdout-test: "\d+#" -> "0#"
 
 // minimal junk
 #![feature(no_core)]
diff --git a/tests/ui/hygiene/unpretty-debug.stdout b/tests/ui/hygiene/unpretty-debug.stdout
index cab3fe2f29b1f..1f620cef239f1 100644
--- a/tests/ui/hygiene/unpretty-debug.stdout
+++ b/tests/ui/hygiene/unpretty-debug.stdout
@@ -2,7 +2,7 @@
 //@ compile-flags: -Zunpretty=expanded,hygiene
 
 // Don't break whenever Symbol numbering changes
-//@ normalize-stdout-test "\d+#" -> "0#"
+//@ normalize-stdout-test: "\d+#" -> "0#"
 
 // minimal junk
 #![feature /* 0#0 */(no_core)]
diff --git a/tests/ui/impl-trait/erased-regions-in-hidden-ty.rs b/tests/ui/impl-trait/erased-regions-in-hidden-ty.rs
index e60f1badcae0f..294b27e1dc183 100644
--- a/tests/ui/impl-trait/erased-regions-in-hidden-ty.rs
+++ b/tests/ui/impl-trait/erased-regions-in-hidden-ty.rs
@@ -2,7 +2,7 @@
 //@ ignore-compare-mode-next-solver (explicit revisions)
 //@ compile-flags: -Zverbose-internals
 //@[next] compile-flags: -Znext-solver
-//@ normalize-stderr-test "DefId\([^\)]+\)" -> "DefId(..)"
+//@ normalize-stderr-test: "DefId\([^\)]+\)" -> "DefId(..)"
 
 #![feature(rustc_attrs)]
 #![rustc_hidden_type_of_opaques]
diff --git a/tests/ui/impl-trait/issue-72911.rs b/tests/ui/impl-trait/issue-72911.rs
index 7ba8579e24fb1..63f4898f4306b 100644
--- a/tests/ui/impl-trait/issue-72911.rs
+++ b/tests/ui/impl-trait/issue-72911.rs
@@ -15,7 +15,6 @@ fn gather_from_file(dir_entry: &foo::MissingItem) -> impl Iterator<Item = Lint>
 
 fn lint_files() -> impl Iterator<Item = foo::MissingItem> {
     //~^ ERROR: failed to resolve
-    //~| ERROR: `()` is not an iterator
     unimplemented!()
 }
 
diff --git a/tests/ui/impl-trait/issue-72911.stderr b/tests/ui/impl-trait/issue-72911.stderr
index 44c20a7be53df..0e86561aa2779 100644
--- a/tests/ui/impl-trait/issue-72911.stderr
+++ b/tests/ui/impl-trait/issue-72911.stderr
@@ -1,11 +1,3 @@
-error[E0277]: `()` is not an iterator
-  --> $DIR/issue-72911.rs:16:20
-   |
-LL | fn lint_files() -> impl Iterator<Item = foo::MissingItem> {
-   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not an iterator
-   |
-   = help: the trait `Iterator` is not implemented for `()`
-
 error[E0433]: failed to resolve: use of undeclared crate or module `foo`
   --> $DIR/issue-72911.rs:11:33
    |
@@ -18,7 +10,6 @@ error[E0433]: failed to resolve: use of undeclared crate or module `foo`
 LL | fn lint_files() -> impl Iterator<Item = foo::MissingItem> {
    |                                         ^^^ use of undeclared crate or module `foo`
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0277, E0433.
-For more information about an error, try `rustc --explain E0277`.
+For more information about this error, try `rustc --explain E0433`.
diff --git a/tests/ui/implied-bounds/issue-100690.rs b/tests/ui/implied-bounds/issue-100690.rs
index 041c687ec9430..b0dbf749c4670 100644
--- a/tests/ui/implied-bounds/issue-100690.rs
+++ b/tests/ui/implied-bounds/issue-100690.rs
@@ -32,10 +32,7 @@ impl<'a, T: 'a> Handle<'a, T, UIView<'a, T>, Result<(), io::Error>> for TUIHandl
         F: FnOnce(&mut UIView<'a, T>) -> Result<(), io::Error> + Send + 'static,
     {
         real_dispatch(f)
-        //~^ ERROR lifetime may not live long enough
-        //~| ERROR implementation of `FnOnce` is not general enough
-        //~| ERROR mismatched types
-        //
+        //~^ ERROR expected a `FnOnce(&mut UIView<'_, T>)` closure, found `F`
     }
 }
 
diff --git a/tests/ui/implied-bounds/issue-100690.stderr b/tests/ui/implied-bounds/issue-100690.stderr
index 2cfd028f2559b..4964dccd551d9 100644
--- a/tests/ui/implied-bounds/issue-100690.stderr
+++ b/tests/ui/implied-bounds/issue-100690.stderr
@@ -1,41 +1,22 @@
-error: lifetime may not live long enough
-  --> $DIR/issue-100690.rs:34:9
+error[E0277]: expected a `FnOnce(&mut UIView<'_, T>)` closure, found `F`
+  --> $DIR/issue-100690.rs:34:23
    |
-LL | impl<'a, T: 'a> Handle<'a, T, UIView<'a, T>, Result<(), io::Error>> for TUIHandle<T> {
-   |      -- lifetime `'a` defined here
-...
 LL |         real_dispatch(f)
-   |         ^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
+   |         ------------- ^ expected an `FnOnce(&mut UIView<'_, T>)` closure, found `F`
+   |         |
+   |         required by a bound introduced by this call
    |
-note: due to current limitations in the borrow checker, this implies a `'static` lifetime
+   = note: expected a closure with arguments `(&mut UIView<'a, _>,)`
+              found a closure with arguments `(&mut UIView<'_, _>,)`
+note: required by a bound in `real_dispatch`
   --> $DIR/issue-100690.rs:8:8
    |
+LL | fn real_dispatch<T, F>(f: F) -> Result<(), io::Error>
+   |    ------------- required by a bound in this function
+LL | where
 LL |     F: FnOnce(&mut UIView<T>) -> Result<(), io::Error> + Send + 'static,
-   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `real_dispatch`
 
-error: implementation of `FnOnce` is not general enough
-  --> $DIR/issue-100690.rs:34:9
-   |
-LL |         real_dispatch(f)
-   |         ^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
-   |
-   = note: `F` must implement `FnOnce<(&mut UIView<'0, T>,)>`, for any lifetime `'0`...
-   = note: ...but it actually implements `FnOnce<(&mut UIView<'1, T>,)>`, for some specific lifetime `'1`
-
-error[E0308]: mismatched types
-  --> $DIR/issue-100690.rs:34:9
-   |
-LL |         real_dispatch(f)
-   |         ^^^^^^^^^^^^^^^^ one type is more general than the other
-   |
-   = note: expected associated type `<F as FnOnce<(&mut UIView<'_, T>,)>>::Output`
-              found associated type `<F as FnOnce<(&mut UIView<'_, T>,)>>::Output`
-note: the lifetime requirement is introduced here
-  --> $DIR/issue-100690.rs:8:34
-   |
-LL |     F: FnOnce(&mut UIView<T>) -> Result<(), io::Error> + Send + 'static,
-   |                                  ^^^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 3 previous errors
+error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0308`.
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/intrinsics/not-overridden.rs b/tests/ui/intrinsics/not-overridden.rs
index 93b408331b862..e1f1bbe095122 100644
--- a/tests/ui/intrinsics/not-overridden.rs
+++ b/tests/ui/intrinsics/not-overridden.rs
@@ -3,9 +3,9 @@
 #![feature(rustc_attrs)]
 //@ build-fail
 //@ failure-status:101
-//@ normalize-stderr-test ".*note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*:\n.*\n" -> ""
-//@ normalize-stderr-test "internal compiler error:.*: intrinsic const_deallocate " -> ""
+//@ normalize-stderr-test: ".*note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*:\n.*\n" -> ""
+//@ normalize-stderr-test: "internal compiler error:.*: intrinsic const_deallocate " -> ""
 //@ rustc-env:RUST_BACKTRACE=0
 
 #[rustc_intrinsic]
diff --git a/tests/ui/io-checks/non-ice-error-on-worker-io-fail.rs b/tests/ui/io-checks/non-ice-error-on-worker-io-fail.rs
index fab7ec166e6fa..a6deb8bab29cc 100644
--- a/tests/ui/io-checks/non-ice-error-on-worker-io-fail.rs
+++ b/tests/ui/io-checks/non-ice-error-on-worker-io-fail.rs
@@ -19,10 +19,10 @@
 //@ error-pattern: error
 
 // On Mac OS X, we get an error like the below
-//@ normalize-stderr-test "failed to write bytecode to ./does-not-exist/output.non_ice_error_on_worker_io_fail.*" -> "io error modifying ./does-not-exist/"
+//@ normalize-stderr-test: "failed to write bytecode to ./does-not-exist/output.non_ice_error_on_worker_io_fail.*" -> "io error modifying ./does-not-exist/"
 
 // On Linux, we get an error like the below
-//@ normalize-stderr-test "couldn't create a temp dir.*" -> "io error modifying ./does-not-exist/"
+//@ normalize-stderr-test: "couldn't create a temp dir.*" -> "io error modifying ./does-not-exist/"
 
 //@ ignore-windows - this is a unix-specific test
 //@ ignore-emscripten - the file-system issues do not replicate here
diff --git a/tests/ui/issues/issue-20676.rs b/tests/ui/issues/issue-20676.rs
index b3319950b42a5..2059365c7d628 100644
--- a/tests/ui/issues/issue-20676.rs
+++ b/tests/ui/issues/issue-20676.rs
@@ -8,5 +8,5 @@ use std::fmt;
 
 fn main() {
     let a: &dyn fmt::Debug = &1;
-    format!("{:?}", a);
+    let _ = format!("{:?}", a);
 }
diff --git a/tests/ui/issues/issue-23024.stderr b/tests/ui/issues/issue-23024.stderr
index 1672622d8b723..62278a51be635 100644
--- a/tests/ui/issues/issue-23024.stderr
+++ b/tests/ui/issues/issue-23024.stderr
@@ -23,7 +23,7 @@ error[E0191]: the value of the associated type `Output` in `FnOnce` must be spec
   --> $DIR/issue-23024.rs:8:39
    |
 LL |     println!("{:?}",(vfnfer[0] as dyn Fn)(3));
-   |                                       ^^ help: specify the associated type: `Fn<Output = Type>`
+   |                                       ^^ help: specify the associated type: `Fn::<Output = Type>`
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/issues/issue-27433.fixed b/tests/ui/issues/issue-27433.fixed
index ff6704e393b5b..f847b698976a0 100644
--- a/tests/ui/issues/issue-27433.fixed
+++ b/tests/ui/issues/issue-27433.fixed
@@ -3,5 +3,5 @@ fn main() {
     let foo = 42u32;
     #[allow(unused_variables, non_snake_case)]
     let FOO : u32 = foo;
-                   //~^ ERROR attempt to use a non-constant value in a constant
+    //~^ ERROR attempt to use a non-constant value in a constant
 }
diff --git a/tests/ui/issues/issue-27433.rs b/tests/ui/issues/issue-27433.rs
index 2a34b43f58d22..9bbc5bcbb459d 100644
--- a/tests/ui/issues/issue-27433.rs
+++ b/tests/ui/issues/issue-27433.rs
@@ -3,5 +3,5 @@ fn main() {
     let foo = 42u32;
     #[allow(unused_variables, non_snake_case)]
     const FOO : u32 = foo;
-                   //~^ ERROR attempt to use a non-constant value in a constant
+    //~^ ERROR attempt to use a non-constant value in a constant
 }
diff --git a/tests/ui/issues/issue-27433.stderr b/tests/ui/issues/issue-27433.stderr
index aba8e612858a2..f6d5fc2b768f5 100644
--- a/tests/ui/issues/issue-27433.stderr
+++ b/tests/ui/issues/issue-27433.stderr
@@ -2,9 +2,12 @@ error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-27433.rs:5:23
    |
 LL |     const FOO : u32 = foo;
-   |     ---------         ^^^ non-constant value
-   |     |
-   |     help: consider using `let` instead of `const`: `let FOO`
+   |                       ^^^ non-constant value
+   |
+help: consider using `let` instead of `const`
+   |
+LL |     let FOO : u32 = foo;
+   |     ~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/issues/issue-28344.stderr b/tests/ui/issues/issue-28344.stderr
index d30fb3cfe58ab..b7e0790f67964 100644
--- a/tests/ui/issues/issue-28344.stderr
+++ b/tests/ui/issues/issue-28344.stderr
@@ -16,7 +16,7 @@ error[E0191]: the value of the associated type `Output` in `BitXor` must be spec
   --> $DIR/issue-28344.rs:4:17
    |
 LL |     let x: u8 = BitXor::bitor(0 as u8, 0 as u8);
-   |                 ^^^^^^ help: specify the associated type: `BitXor<Output = Type>`
+   |                 ^^^^^^ help: specify the associated type: `BitXor::<Output = Type>`
 
 error[E0599]: no function or associated item named `bitor` found for trait object `dyn BitXor<_>` in the current scope
   --> $DIR/issue-28344.rs:4:25
@@ -44,7 +44,7 @@ error[E0191]: the value of the associated type `Output` in `BitXor` must be spec
   --> $DIR/issue-28344.rs:10:13
    |
 LL |     let g = BitXor::bitor;
-   |             ^^^^^^ help: specify the associated type: `BitXor<Output = Type>`
+   |             ^^^^^^ help: specify the associated type: `BitXor::<Output = Type>`
 
 error[E0599]: no function or associated item named `bitor` found for trait object `dyn BitXor<_>` in the current scope
   --> $DIR/issue-28344.rs:10:21
diff --git a/tests/ui/issues/issue-28625.rs b/tests/ui/issues/issue-28625.rs
index 2f25bf8c734ff..23f96d10bf261 100644
--- a/tests/ui/issues/issue-28625.rs
+++ b/tests/ui/issues/issue-28625.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "\d+ bits" -> "N bits"
+//@ normalize-stderr-test: "\d+ bits" -> "N bits"
 
 trait Bar {
     type Bar;
diff --git a/tests/ui/issues/issue-32377.rs b/tests/ui/issues/issue-32377.rs
index 6e4a7661a237e..3a4942deb8347 100644
--- a/tests/ui/issues/issue-32377.rs
+++ b/tests/ui/issues/issue-32377.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "\d+ bits" -> "N bits"
+//@ normalize-stderr-test: "\d+ bits" -> "N bits"
 
 use std::mem;
 use std::marker::PhantomData;
diff --git a/tests/ui/issues/issue-3521-2.stderr b/tests/ui/issues/issue-3521-2.stderr
index 0be0e93c19e64..a12241cb1dfd5 100644
--- a/tests/ui/issues/issue-3521-2.stderr
+++ b/tests/ui/issues/issue-3521-2.stderr
@@ -2,9 +2,12 @@ error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-3521-2.rs:5:23
    |
 LL |     static y: isize = foo + 1;
-   |     --------          ^^^ non-constant value
-   |     |
-   |     help: consider using `let` instead of `static`: `let y`
+   |                       ^^^ non-constant value
+   |
+help: consider using `let` instead of `static`
+   |
+LL |     let y: isize = foo + 1;
+   |     ~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668-2.stderr b/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668-2.stderr
index 3676f388891eb..9661dbf2f62fa 100644
--- a/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668-2.stderr
+++ b/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668-2.stderr
@@ -2,9 +2,12 @@ error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-3668-2.rs:4:27
    |
 LL |     static child: isize = x + 1;
-   |     ------------          ^ non-constant value
-   |     |
-   |     help: consider using `let` instead of `static`: `let child`
+   |                           ^ non-constant value
+   |
+help: consider using `let` instead of `static`
+   |
+LL |     let child: isize = x + 1;
+   |     ~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668.stderr b/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668.stderr
index d761b2d87db4e..7fad45f4b1a25 100644
--- a/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668.stderr
+++ b/tests/ui/issues/issue-3668-non-constant-value-in-constant/issue-3668.stderr
@@ -2,9 +2,12 @@ error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-3668.rs:8:34
    |
 LL |        static childVal: Box<P> = self.child.get();
-   |        ---------------           ^^^^ non-constant value
-   |        |
-   |        help: consider using `let` instead of `static`: `let childVal`
+   |                                  ^^^^ non-constant value
+   |
+help: consider using `let` instead of `static`
+   |
+LL |        let childVal: Box<P> = self.child.get();
+   |        ~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/issues/issue-44239.stderr b/tests/ui/issues/issue-44239.stderr
index 633fb177b75df..1a047d4c63b69 100644
--- a/tests/ui/issues/issue-44239.stderr
+++ b/tests/ui/issues/issue-44239.stderr
@@ -1,11 +1,13 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-44239.rs:8:26
    |
-LL |     let n: usize = 0;
-   |     ----- help: consider using `const` instead of `let`: `const n`
-...
 LL |         const N: usize = n;
    |                          ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const n: usize = 0;
+   |     ~~~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/lang-items/duplicate.rs b/tests/ui/lang-items/duplicate.rs
index 2b68fef87c0a7..3aa7dd2b0bee1 100644
--- a/tests/ui/lang-items/duplicate.rs
+++ b/tests/ui/lang-items/duplicate.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "loaded from .*libcore-.*.rlib" -> "loaded from SYSROOT/libcore-*.rlib"
+//@ normalize-stderr-test: "loaded from .*libcore-.*.rlib" -> "loaded from SYSROOT/libcore-*.rlib"
 #![feature(lang_items)]
 
 #[lang = "sized"]
diff --git a/tests/ui/layout/debug.rs b/tests/ui/layout/debug.rs
index b917cceafd507..aeacbc784462d 100644
--- a/tests/ui/layout/debug.rs
+++ b/tests/ui/layout/debug.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
 #![feature(never_type, rustc_attrs, type_alias_impl_trait, repr_simd)]
 #![crate_type = "lib"]
 
diff --git a/tests/ui/layout/enum-scalar-pair-int-ptr.rs b/tests/ui/layout/enum-scalar-pair-int-ptr.rs
index a1aec094d8025..885cc3e37dfd6 100644
--- a/tests/ui/layout/enum-scalar-pair-int-ptr.rs
+++ b/tests/ui/layout/enum-scalar-pair-int-ptr.rs
@@ -1,6 +1,6 @@
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
-//@ normalize-stderr-test "Int\(I[0-9]+," -> "Int(I?,"
-//@ normalize-stderr-test "valid_range: 0..=[0-9]+" -> "valid_range: $$VALID_RANGE"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
+//@ normalize-stderr-test: "Int\(I[0-9]+," -> "Int(I?,"
+//@ normalize-stderr-test: "valid_range: 0..=[0-9]+" -> "valid_range: $$VALID_RANGE"
 
 //! Enum layout tests related to scalar pairs with an int/ptr common primitive.
 
diff --git a/tests/ui/layout/enum.rs b/tests/ui/layout/enum.rs
index e0a7fc328df30..b58d390a2eff6 100644
--- a/tests/ui/layout/enum.rs
+++ b/tests/ui/layout/enum.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
 //! Various enum layout tests.
 
 #![feature(rustc_attrs)]
diff --git a/tests/ui/layout/issue-96158-scalarpair-payload-might-be-uninit.rs b/tests/ui/layout/issue-96158-scalarpair-payload-might-be-uninit.rs
index 3acacc4559c1b..2c8179a63d807 100644
--- a/tests/ui/layout/issue-96158-scalarpair-payload-might-be-uninit.rs
+++ b/tests/ui/layout/issue-96158-scalarpair-payload-might-be-uninit.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
 #![crate_type = "lib"]
 #![feature(rustc_attrs)]
 
diff --git a/tests/ui/layout/issue-96185-overaligned-enum.rs b/tests/ui/layout/issue-96185-overaligned-enum.rs
index 3889a423906ea..88863d14cb7fe 100644
--- a/tests/ui/layout/issue-96185-overaligned-enum.rs
+++ b/tests/ui/layout/issue-96185-overaligned-enum.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
 #![crate_type = "lib"]
 #![feature(rustc_attrs)]
 
diff --git a/tests/ui/layout/struct.rs b/tests/ui/layout/struct.rs
index 484490a5f780c..d072d123b0d4a 100644
--- a/tests/ui/layout/struct.rs
+++ b/tests/ui/layout/struct.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
 //! Various struct layout tests.
 
 #![feature(rustc_attrs)]
diff --git a/tests/ui/layout/valid_range_oob.rs b/tests/ui/layout/valid_range_oob.rs
index 12f519ff2ca58..38ab5cec7a668 100644
--- a/tests/ui/layout/valid_range_oob.rs
+++ b/tests/ui/layout/valid_range_oob.rs
@@ -1,6 +1,6 @@
 //@ failure-status: 101
-//@ normalize-stderr-test "note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
+//@ normalize-stderr-test: "note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*\n" -> ""
 //@ rustc-env:RUST_BACKTRACE=0
 
 #![feature(rustc_attrs)]
diff --git a/tests/ui/layout/zero-sized-array-enum-niche.rs b/tests/ui/layout/zero-sized-array-enum-niche.rs
index 0c37c0f010e2b..433db46b7a002 100644
--- a/tests/ui/layout/zero-sized-array-enum-niche.rs
+++ b/tests/ui/layout/zero-sized-array-enum-niche.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$PREF_ALIGN"
 #![crate_type = "lib"]
 #![feature(rustc_attrs)]
 
diff --git a/tests/ui/limits/huge-enum.rs b/tests/ui/limits/huge-enum.rs
index a6e6c5b73beea..cf6e637388c7f 100644
--- a/tests/ui/limits/huge-enum.rs
+++ b/tests/ui/limits/huge-enum.rs
@@ -1,6 +1,6 @@
 //@ build-fail
-//@ normalize-stderr-test "std::option::Option<\[u32; \d+\]>" -> "TYPE"
-//@ normalize-stderr-test "\[u32; \d+\]" -> "TYPE"
+//@ normalize-stderr-test: "std::option::Option<\[u32; \d+\]>" -> "TYPE"
+//@ normalize-stderr-test: "\[u32; \d+\]" -> "TYPE"
 
 #[cfg(target_pointer_width = "32")]
 type BIG = Option<[u32; (1<<29)-1]>;
diff --git a/tests/ui/limits/huge-struct.rs b/tests/ui/limits/huge-struct.rs
index c9fd56b3a578a..b9e90b3e9d1ae 100644
--- a/tests/ui/limits/huge-struct.rs
+++ b/tests/ui/limits/huge-struct.rs
@@ -1,6 +1,6 @@
 //@ build-fail
-//@ normalize-stderr-test "S32" -> "SXX"
-//@ normalize-stderr-test "S1M" -> "SXX"
+//@ normalize-stderr-test: "S32" -> "SXX"
+//@ normalize-stderr-test: "S1M" -> "SXX"
 //@ error-pattern: too big for the current
 
 struct S32<T> {
diff --git a/tests/ui/limits/issue-17913.rs b/tests/ui/limits/issue-17913.rs
index 5df8c48c7ec0c..325923f32f376 100644
--- a/tests/ui/limits/issue-17913.rs
+++ b/tests/ui/limits/issue-17913.rs
@@ -1,5 +1,5 @@
 //@ build-fail
-//@ normalize-stderr-test "\[&usize; \d+\]" -> "[&usize; usize::MAX]"
+//@ normalize-stderr-test: "\[&usize; \d+\]" -> "[&usize; usize::MAX]"
 //@ error-pattern: too big for the current architecture
 
 #[cfg(target_pointer_width = "64")]
diff --git a/tests/ui/limits/issue-55878.rs b/tests/ui/limits/issue-55878.rs
index 1372433e11a57..4d91a173240da 100644
--- a/tests/ui/limits/issue-55878.rs
+++ b/tests/ui/limits/issue-55878.rs
@@ -1,6 +1,6 @@
 //@ build-fail
-//@ normalize-stderr-64bit "18446744073709551615" -> "SIZE"
-//@ normalize-stderr-32bit "4294967295" -> "SIZE"
+//@ normalize-stderr-64bit: "18446744073709551615" -> "SIZE"
+//@ normalize-stderr-32bit: "4294967295" -> "SIZE"
 
 //@ error-pattern: are too big for the current architecture
 fn main() {
diff --git a/tests/ui/lint/lint-overflowing-ops.rs b/tests/ui/lint/lint-overflowing-ops.rs
index 3aadf77324377..c5b9f892b0b85 100644
--- a/tests/ui/lint/lint-overflowing-ops.rs
+++ b/tests/ui/lint/lint-overflowing-ops.rs
@@ -11,8 +11,8 @@
 //@ [opt_with_overflow_checks]compile-flags: -C overflow-checks=on -O -Z deduplicate-diagnostics=yes
 //@ build-fail
 //@ ignore-pass (test tests codegen-time behaviour)
-//@ normalize-stderr-test "shift left by `(64|32)_usize`, which" -> "shift left by `%BITS%`, which"
-//@ normalize-stderr-test "shift right by `(64|32)_usize`, which" -> "shift right by `%BITS%`, which"
+//@ normalize-stderr-test: "shift left by `(64|32)_usize`, which" -> "shift left by `%BITS%`, which"
+//@ normalize-stderr-test: "shift right by `(64|32)_usize`, which" -> "shift right by `%BITS%`, which"
 
 #![deny(arithmetic_overflow)]
 
diff --git a/tests/ui/lto/debuginfo-lto-alloc.rs b/tests/ui/lto/debuginfo-lto-alloc.rs
new file mode 100644
index 0000000000000..459103c354c1c
--- /dev/null
+++ b/tests/ui/lto/debuginfo-lto-alloc.rs
@@ -0,0 +1,22 @@
+// With the upgrade to LLVM 16, the following error appeared when using
+// link-time-optimization (LTO) alloc and debug compilation mode simultaneously:
+//
+//   error: Cannot represent a difference across sections
+//
+// The error stemmed from DI function definitions under type scopes, fixed by
+// only declaring in type scope and defining the subprogram elsewhere.
+// This test reproduces the circumstances that caused the error to appear, and checks
+// that compilation is successful.
+
+//@ check-pass
+//@ compile-flags: --test -C debuginfo=2 -C lto=fat -C incremental=inc-fat
+
+extern crate alloc;
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn something_alloc() {
+        assert_eq!(Vec::<u32>::new(), Vec::<u32>::new());
+    }
+}
diff --git a/tests/ui/macros/expr_2021_cargo_fix_edition.fixed b/tests/ui/macros/expr_2021_cargo_fix_edition.fixed
new file mode 100644
index 0000000000000..1becd8a92d62e
--- /dev/null
+++ b/tests/ui/macros/expr_2021_cargo_fix_edition.fixed
@@ -0,0 +1,24 @@
+//@ run-rustfix
+//@ check-pass
+//@ compile-flags: --edition=2021
+#![allow(incomplete_features)]
+#![feature(expr_fragment_specifier_2024)]
+#![warn(edition_2024_expr_fragment_specifier)]
+
+macro_rules! m {
+    ($e:expr_2021) => { //~ WARN: the `expr` fragment specifier will accept more expressions in the 2024 edition
+       //~^ WARN: this changes meaning in Rust 2024
+        $e
+    };
+    ($($i:expr_2021)*) => { }; //~ WARN: the `expr` fragment specifier will accept more expressions in the 2024 edition
+       //~^ WARN: this changes meaning in Rust 2024
+}
+
+macro_rules! test {
+    (expr) => {}
+}
+
+fn main() {
+    m!(());
+    test!(expr);
+}
diff --git a/tests/ui/macros/expr_2021_cargo_fix_edition.rs b/tests/ui/macros/expr_2021_cargo_fix_edition.rs
new file mode 100644
index 0000000000000..ec0b86d2c2332
--- /dev/null
+++ b/tests/ui/macros/expr_2021_cargo_fix_edition.rs
@@ -0,0 +1,24 @@
+//@ run-rustfix
+//@ check-pass
+//@ compile-flags: --edition=2021
+#![allow(incomplete_features)]
+#![feature(expr_fragment_specifier_2024)]
+#![warn(edition_2024_expr_fragment_specifier)]
+
+macro_rules! m {
+    ($e:expr) => { //~ WARN: the `expr` fragment specifier will accept more expressions in the 2024 edition
+       //~^ WARN: this changes meaning in Rust 2024
+        $e
+    };
+    ($($i:expr)*) => { }; //~ WARN: the `expr` fragment specifier will accept more expressions in the 2024 edition
+       //~^ WARN: this changes meaning in Rust 2024
+}
+
+macro_rules! test {
+    (expr) => {}
+}
+
+fn main() {
+    m!(());
+    test!(expr);
+}
diff --git a/tests/ui/macros/expr_2021_cargo_fix_edition.stderr b/tests/ui/macros/expr_2021_cargo_fix_edition.stderr
new file mode 100644
index 0000000000000..e8a44fed322f9
--- /dev/null
+++ b/tests/ui/macros/expr_2021_cargo_fix_edition.stderr
@@ -0,0 +1,33 @@
+warning: the `expr` fragment specifier will accept more expressions in the 2024 edition
+  --> $DIR/expr_2021_cargo_fix_edition.rs:9:9
+   |
+LL |     ($e:expr) => {
+   |         ^^^^
+   |
+   = warning: this changes meaning in Rust 2024
+   = note: for more information, see Migration Guide <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/macro-fragment-specifiers.html>
+note: the lint level is defined here
+  --> $DIR/expr_2021_cargo_fix_edition.rs:6:9
+   |
+LL | #![warn(edition_2024_expr_fragment_specifier)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+help: to keep the existing behavior, use the `expr_2021` fragment specifier
+   |
+LL |     ($e:expr_2021) => {
+   |         ~~~~~~~~~
+
+warning: the `expr` fragment specifier will accept more expressions in the 2024 edition
+  --> $DIR/expr_2021_cargo_fix_edition.rs:13:11
+   |
+LL |     ($($i:expr)*) => { };
+   |           ^^^^
+   |
+   = warning: this changes meaning in Rust 2024
+   = note: for more information, see Migration Guide <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/macro-fragment-specifiers.html>
+help: to keep the existing behavior, use the `expr_2021` fragment specifier
+   |
+LL |     ($($i:expr_2021)*) => { };
+   |           ~~~~~~~~~
+
+warning: 2 warnings emitted
+
diff --git a/tests/ui/macros/expr_2021_inline_const.edi2021.stderr b/tests/ui/macros/expr_2021_inline_const.edi2021.stderr
index 5e88096445473..b55ae62030c56 100644
--- a/tests/ui/macros/expr_2021_inline_const.edi2021.stderr
+++ b/tests/ui/macros/expr_2021_inline_const.edi2021.stderr
@@ -1,5 +1,5 @@
 error: no rules expected the token `const`
-  --> $DIR/expr_2021_inline_const.rs:21:12
+  --> $DIR/expr_2021_inline_const.rs:26:12
    |
 LL | macro_rules! m2021 {
    | ------------------ when calling this macro
@@ -14,7 +14,7 @@ LL |     ($e:expr_2021) => {
    |      ^^^^^^^^^^^^
 
 error: no rules expected the token `const`
-  --> $DIR/expr_2021_inline_const.rs:22:12
+  --> $DIR/expr_2021_inline_const.rs:27:12
    |
 LL | macro_rules! m2024 {
    | ------------------ when calling this macro
diff --git a/tests/ui/macros/expr_2021_inline_const.edi2024.stderr b/tests/ui/macros/expr_2021_inline_const.edi2024.stderr
index 237ecb2cc192a..285db53d6c834 100644
--- a/tests/ui/macros/expr_2021_inline_const.edi2024.stderr
+++ b/tests/ui/macros/expr_2021_inline_const.edi2024.stderr
@@ -1,5 +1,5 @@
 error: no rules expected the token `const`
-  --> $DIR/expr_2021_inline_const.rs:21:12
+  --> $DIR/expr_2021_inline_const.rs:26:12
    |
 LL | macro_rules! m2021 {
    | ------------------ when calling this macro
diff --git a/tests/ui/macros/expr_2021_inline_const.rs b/tests/ui/macros/expr_2021_inline_const.rs
index ebc5ea3642108..06b74a466d6e2 100644
--- a/tests/ui/macros/expr_2021_inline_const.rs
+++ b/tests/ui/macros/expr_2021_inline_const.rs
@@ -17,7 +17,14 @@ macro_rules! m2024 {
         $e
     };
 }
+
+macro_rules! test {
+    (expr) => {}
+}
+
 fn main() {
     m2021!(const { 1 }); //~ ERROR: no rules expected the token `const`
     m2024!(const { 1 }); //[edi2021]~ ERROR: no rules expected the token `const`
+
+    test!(expr);
 }
diff --git a/tests/ui/mir/alignment/misaligned-constant-gvn.rs b/tests/ui/mir/alignment/misaligned-constant-gvn.rs
new file mode 100644
index 0000000000000..363d5c0ed34c6
--- /dev/null
+++ b/tests/ui/mir/alignment/misaligned-constant-gvn.rs
@@ -0,0 +1,8 @@
+//@ build-pass
+//@ compile-flags: -Zmir-opt-level=0 -Zmir-enable-passes=+GVN
+
+fn main() {
+    let variant: Option<u32> = None;
+    let transmuted: u64 = unsafe { std::mem::transmute(variant) };
+    println!("{transmuted}");
+}
diff --git a/tests/ui/mir/lint/storage-live.rs b/tests/ui/mir/lint/storage-live.rs
index d734b773642e9..ded02150342d5 100644
--- a/tests/ui/mir/lint/storage-live.rs
+++ b/tests/ui/mir/lint/storage-live.rs
@@ -2,10 +2,10 @@
 //@ failure-status: 101
 //@ error-pattern: broken MIR in
 //@ error-pattern: StorageLive(_1) which already has storage here
-//@ normalize-stderr-test "note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
-//@ normalize-stderr-test "storage_live\[....\]" -> "storage_live[HASH]"
-//@ normalize-stderr-test "(delayed at [^:]+):\d+:\d+ - " -> "$1:LL:CC - "
+//@ normalize-stderr-test: "note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*\n" -> ""
+//@ normalize-stderr-test: "storage_live\[....\]" -> "storage_live[HASH]"
+//@ normalize-stderr-test: "(delayed at [^:]+):\d+:\d+ - " -> "$1:LL:CC - "
 //@ rustc-env:RUST_BACKTRACE=0
 
 #![feature(custom_mir, core_intrinsics)]
diff --git a/tests/ui/mismatched_types/cast-rfc0401.rs b/tests/ui/mismatched_types/cast-rfc0401.rs
index 57222f45947b4..b2ff5b4a0c063 100644
--- a/tests/ui/mismatched_types/cast-rfc0401.rs
+++ b/tests/ui/mismatched_types/cast-rfc0401.rs
@@ -66,7 +66,7 @@ fn main()
 
     let cf: *const dyn Foo = &0;
     let _ = cf as *const [u16]; //~ ERROR is invalid
-    let _ = cf as *const dyn Bar; //~ ERROR is invalid
+    let _ = cf as *const dyn Bar; //~ ERROR casting `*const dyn Foo` as `*const dyn Bar` is invalid
 
     vec![0.0].iter().map(|s| s as f32).collect::<Vec<f32>>(); //~ ERROR is invalid
 }
diff --git a/tests/ui/mismatched_types/issue-74918-missing-lifetime.rs b/tests/ui/mismatched_types/issue-74918-missing-lifetime.rs
index c7842667dc614..6aa34354a7ad9 100644
--- a/tests/ui/mismatched_types/issue-74918-missing-lifetime.rs
+++ b/tests/ui/mismatched_types/issue-74918-missing-lifetime.rs
@@ -9,7 +9,6 @@ impl<T, S: Iterator<Item = T>> Iterator for ChunkingIterator<T, S> {
     type Item = IteratorChunk<T, S>; //~ ERROR missing lifetime
 
     fn next(&mut self) -> Option<IteratorChunk<T, S>> {
-        //~^ ERROR `impl` item signature doesn't match `trait` item signature
         todo!()
     }
 }
diff --git a/tests/ui/mismatched_types/issue-74918-missing-lifetime.stderr b/tests/ui/mismatched_types/issue-74918-missing-lifetime.stderr
index b523182309959..5020395eb6aea 100644
--- a/tests/ui/mismatched_types/issue-74918-missing-lifetime.stderr
+++ b/tests/ui/mismatched_types/issue-74918-missing-lifetime.stderr
@@ -9,20 +9,6 @@ help: consider introducing a named lifetime parameter
 LL |     type Item<'a> = IteratorChunk<'a, T, S>;
    |              ++++                 +++
 
-error: `impl` item signature doesn't match `trait` item signature
-  --> $DIR/issue-74918-missing-lifetime.rs:11:5
-   |
-LL |     fn next(&mut self) -> Option<IteratorChunk<T, S>> {
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(&'1 mut ChunkingIterator<T, S>) -> Option<IteratorChunk<'1, T, S>>`
-  --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
-   |
-   = note: expected `fn(&'1 mut ChunkingIterator<T, S>) -> Option<IteratorChunk<'2, T, S>>`
-   |
-   = note: expected signature `fn(&'1 mut ChunkingIterator<T, S>) -> Option<IteratorChunk<'2, T, S>>`
-              found signature `fn(&'1 mut ChunkingIterator<T, S>) -> Option<IteratorChunk<'1, T, S>>`
-   = help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
-   = help: verify the lifetime relationships in the `trait` and `impl` between the `self` argument, the other inputs and its output
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0106`.
diff --git a/tests/ui/mismatched_types/recovered-block.rs b/tests/ui/mismatched_types/recovered-block.rs
index a91bbe7083bc2..f3078f4648940 100644
--- a/tests/ui/mismatched_types/recovered-block.rs
+++ b/tests/ui/mismatched_types/recovered-block.rs
@@ -10,6 +10,6 @@ pub fn foo() -> Foo {
 
     pub Foo { text }
 }
-//~^^ ERROR missing `struct` for struct definition
+//~^^ ERROR missing `enum` for enum definition
 
 fn main() {}
diff --git a/tests/ui/mismatched_types/recovered-block.stderr b/tests/ui/mismatched_types/recovered-block.stderr
index 51b5f3b1af2fc..35ce134ab61b0 100644
--- a/tests/ui/mismatched_types/recovered-block.stderr
+++ b/tests/ui/mismatched_types/recovered-block.stderr
@@ -1,13 +1,13 @@
-error: missing `struct` for struct definition
-  --> $DIR/recovered-block.rs:11:8
+error: missing `enum` for enum definition
+  --> $DIR/recovered-block.rs:11:5
    |
 LL |     pub Foo { text }
-   |        ^
+   |     ^^^^^^^
    |
-help: add `struct` here to parse `Foo` as a public struct
+help: add `enum` here to parse `Foo` as an enum
    |
-LL |     pub struct Foo { text }
-   |         ++++++
+LL |     pub enum Foo { text }
+   |         ++++
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/mismatched_types/transforming-option-ref-issue-127545.rs b/tests/ui/mismatched_types/transforming-option-ref-issue-127545.rs
new file mode 100644
index 0000000000000..5ba58e7427581
--- /dev/null
+++ b/tests/ui/mismatched_types/transforming-option-ref-issue-127545.rs
@@ -0,0 +1,6 @@
+// Regression test for <https://github.com/rust-lang/rust/issues/127545>.
+#![crate_type = "lib"]
+
+pub fn foo(arg: Option<&Vec<i32>>) -> Option<&[i32]> {
+    arg //~ ERROR 5:5: 5:8: mismatched types [E0308]
+}
diff --git a/tests/ui/mismatched_types/transforming-option-ref-issue-127545.stderr b/tests/ui/mismatched_types/transforming-option-ref-issue-127545.stderr
new file mode 100644
index 0000000000000..b7c7202113a16
--- /dev/null
+++ b/tests/ui/mismatched_types/transforming-option-ref-issue-127545.stderr
@@ -0,0 +1,18 @@
+error[E0308]: mismatched types
+  --> $DIR/transforming-option-ref-issue-127545.rs:5:5
+   |
+LL | pub fn foo(arg: Option<&Vec<i32>>) -> Option<&[i32]> {
+   |                                       -------------- expected `Option<&[i32]>` because of return type
+LL |     arg
+   |     ^^^ expected `Option<&[i32]>`, found `Option<&Vec<i32>>`
+   |
+   = note: expected enum `Option<&[i32]>`
+              found enum `Option<&Vec<i32>>`
+help: try using `.map(|v| &**v)` to convert `Option<&Vec<i32>>` to `Option<&[i32]>`
+   |
+LL |     arg.map(|v| &**v)
+   |        ++++++++++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/moves/moved-value-on-as-ref-arg.fixed b/tests/ui/moves/moved-value-on-as-ref-arg.fixed
new file mode 100644
index 0000000000000..292fa98a3f71b
--- /dev/null
+++ b/tests/ui/moves/moved-value-on-as-ref-arg.fixed
@@ -0,0 +1,37 @@
+//@ run-rustfix
+#![allow(unused_mut)]
+use std::borrow::{Borrow, BorrowMut};
+use std::convert::{AsMut, AsRef};
+struct Bar;
+
+impl AsRef<Bar> for Bar {
+    fn as_ref(&self) -> &Bar {
+        self
+    }
+}
+
+impl AsMut<Bar> for Bar {
+    fn as_mut(&mut self) -> &mut Bar {
+        self
+    }
+}
+
+fn foo<T: AsRef<Bar>>(_: T) {}
+fn qux<T: AsMut<Bar>>(_: T) {}
+fn bat<T: Borrow<T>>(_: T) {}
+fn baz<T: BorrowMut<T>>(_: T) {}
+
+pub fn main() {
+    let bar = Bar;
+    foo(&bar);
+    let _baa = bar; //~ ERROR use of moved value
+    let mut bar = Bar;
+    qux(&mut bar);
+    let _baa = bar; //~ ERROR use of moved value
+    let bar = Bar;
+    bat(&bar);
+    let _baa = bar; //~ ERROR use of moved value
+    let mut bar = Bar;
+    baz(&mut bar);
+    let _baa = bar; //~ ERROR use of moved value
+}
diff --git a/tests/ui/moves/moved-value-on-as-ref-arg.rs b/tests/ui/moves/moved-value-on-as-ref-arg.rs
new file mode 100644
index 0000000000000..632af9efcda3e
--- /dev/null
+++ b/tests/ui/moves/moved-value-on-as-ref-arg.rs
@@ -0,0 +1,37 @@
+//@ run-rustfix
+#![allow(unused_mut)]
+use std::borrow::{Borrow, BorrowMut};
+use std::convert::{AsMut, AsRef};
+struct Bar;
+
+impl AsRef<Bar> for Bar {
+    fn as_ref(&self) -> &Bar {
+        self
+    }
+}
+
+impl AsMut<Bar> for Bar {
+    fn as_mut(&mut self) -> &mut Bar {
+        self
+    }
+}
+
+fn foo<T: AsRef<Bar>>(_: T) {}
+fn qux<T: AsMut<Bar>>(_: T) {}
+fn bat<T: Borrow<T>>(_: T) {}
+fn baz<T: BorrowMut<T>>(_: T) {}
+
+pub fn main() {
+    let bar = Bar;
+    foo(bar);
+    let _baa = bar; //~ ERROR use of moved value
+    let mut bar = Bar;
+    qux(bar);
+    let _baa = bar; //~ ERROR use of moved value
+    let bar = Bar;
+    bat(bar);
+    let _baa = bar; //~ ERROR use of moved value
+    let mut bar = Bar;
+    baz(bar);
+    let _baa = bar; //~ ERROR use of moved value
+}
diff --git a/tests/ui/moves/moved-value-on-as-ref-arg.stderr b/tests/ui/moves/moved-value-on-as-ref-arg.stderr
new file mode 100644
index 0000000000000..4004b7a43bc09
--- /dev/null
+++ b/tests/ui/moves/moved-value-on-as-ref-arg.stderr
@@ -0,0 +1,79 @@
+error[E0382]: use of moved value: `bar`
+  --> $DIR/moved-value-on-as-ref-arg.rs:27:16
+   |
+LL |     let bar = Bar;
+   |         --- move occurs because `bar` has type `Bar`, which does not implement the `Copy` trait
+LL |     foo(bar);
+   |         --- value moved here
+LL |     let _baa = bar;
+   |                ^^^ value used here after move
+   |
+help: borrow the value to avoid moving it
+   |
+LL |     foo(&bar);
+   |         +
+
+error[E0382]: use of moved value: `bar`
+  --> $DIR/moved-value-on-as-ref-arg.rs:30:16
+   |
+LL |     let mut bar = Bar;
+   |         ------- move occurs because `bar` has type `Bar`, which does not implement the `Copy` trait
+LL |     qux(bar);
+   |         --- value moved here
+LL |     let _baa = bar;
+   |                ^^^ value used here after move
+   |
+note: if `Bar` implemented `Clone`, you could clone the value
+  --> $DIR/moved-value-on-as-ref-arg.rs:5:1
+   |
+LL | struct Bar;
+   | ^^^^^^^^^^ consider implementing `Clone` for this type
+...
+LL |     qux(bar);
+   |         --- you could clone this value
+help: borrow the value to avoid moving it
+   |
+LL |     qux(&mut bar);
+   |         ++++
+
+error[E0382]: use of moved value: `bar`
+  --> $DIR/moved-value-on-as-ref-arg.rs:33:16
+   |
+LL |     let bar = Bar;
+   |         --- move occurs because `bar` has type `Bar`, which does not implement the `Copy` trait
+LL |     bat(bar);
+   |         --- value moved here
+LL |     let _baa = bar;
+   |                ^^^ value used here after move
+   |
+help: borrow the value to avoid moving it
+   |
+LL |     bat(&bar);
+   |         +
+
+error[E0382]: use of moved value: `bar`
+  --> $DIR/moved-value-on-as-ref-arg.rs:36:16
+   |
+LL |     let mut bar = Bar;
+   |         ------- move occurs because `bar` has type `Bar`, which does not implement the `Copy` trait
+LL |     baz(bar);
+   |         --- value moved here
+LL |     let _baa = bar;
+   |                ^^^ value used here after move
+   |
+note: if `Bar` implemented `Clone`, you could clone the value
+  --> $DIR/moved-value-on-as-ref-arg.rs:5:1
+   |
+LL | struct Bar;
+   | ^^^^^^^^^^ consider implementing `Clone` for this type
+...
+LL |     baz(bar);
+   |         --- you could clone this value
+help: borrow the value to avoid moving it
+   |
+LL |     baz(&mut bar);
+   |         ++++
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0382`.
diff --git a/tests/ui/native-library-link-flags/msvc-non-utf8-output.rs b/tests/ui/native-library-link-flags/msvc-non-utf8-output.rs
index 776e3bf12ad26..659a832247a9b 100644
--- a/tests/ui/native-library-link-flags/msvc-non-utf8-output.rs
+++ b/tests/ui/native-library-link-flags/msvc-non-utf8-output.rs
@@ -1,5 +1,5 @@
 //@ build-fail
 //@ compile-flags:-C link-arg=⦺ⅈ⽯⭏⽽◃⡽⚞
 //@ only-msvc
-//@ normalize-stderr-test "(?:.|\n)*(⦺ⅈ⽯⭏⽽◃⡽⚞)(?:.|\n)*" -> "$1"
+//@ normalize-stderr-test: "(?:.|\n)*(⦺ⅈ⽯⭏⽽◃⡽⚞)(?:.|\n)*" -> "$1"
 pub fn main() {}
diff --git a/tests/ui/packed/packed-struct-transmute.rs b/tests/ui/packed/packed-struct-transmute.rs
index cf7c1f2b7cd55..0a887e3886d59 100644
--- a/tests/ui/packed/packed-struct-transmute.rs
+++ b/tests/ui/packed/packed-struct-transmute.rs
@@ -3,7 +3,7 @@
 // the error points to the start of the file, not the line with the
 // transmute
 
-//@ normalize-stderr-test "\d+ bits" -> "N bits"
+//@ normalize-stderr-test: "\d+ bits" -> "N bits"
 //@ error-pattern: cannot transmute between types of different sizes, or dependently-sized types
 
 use std::mem;
diff --git a/tests/ui/panic-handler/panic-handler-std.rs b/tests/ui/panic-handler/panic-handler-std.rs
index 051828ec8809f..82e6de43a2ec7 100644
--- a/tests/ui/panic-handler/panic-handler-std.rs
+++ b/tests/ui/panic-handler/panic-handler-std.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "loaded from .*libstd-.*.rlib" -> "loaded from SYSROOT/libstd-*.rlib"
+//@ normalize-stderr-test: "loaded from .*libstd-.*.rlib" -> "loaded from SYSROOT/libstd-*.rlib"
 //@ error-pattern: found duplicate lang item `panic_impl`
 
 extern crate core;
diff --git a/tests/ui/panics/default-backtrace-ice.rs b/tests/ui/panics/default-backtrace-ice.rs
index e0e99a0289579..718d1da5bb759 100644
--- a/tests/ui/panics/default-backtrace-ice.rs
+++ b/tests/ui/panics/default-backtrace-ice.rs
@@ -3,12 +3,12 @@
 //@ error-pattern:stack backtrace:
 //@ failure-status:101
 //@ ignore-msvc
-//@ normalize-stderr-test "note: .*" -> ""
-//@ normalize-stderr-test "thread 'rustc' .*" -> ""
-//@ normalize-stderr-test " +\d+:.*__rust_begin_short_backtrace.*" -> "(begin_short_backtrace)"
-//@ normalize-stderr-test " +\d+:.*__rust_end_short_backtrace.*" -> "(end_short_backtrace)"
-//@ normalize-stderr-test " +\d+:.*\n" -> ""
-//@ normalize-stderr-test " +at .*\n" -> ""
+//@ normalize-stderr-test: "note: .*" -> ""
+//@ normalize-stderr-test: "thread 'rustc' .*" -> ""
+//@ normalize-stderr-test: " +\d+:.*__rust_begin_short_backtrace.*" -> "(begin_short_backtrace)"
+//@ normalize-stderr-test: " +\d+:.*__rust_end_short_backtrace.*" -> "(end_short_backtrace)"
+//@ normalize-stderr-test: " +\d+:.*\n" -> ""
+//@ normalize-stderr-test: " +at .*\n" -> ""
 //
 // This test makes sure that full backtraces are used for ICEs when
 // RUST_BACKTRACE is not set. It does this by checking for the presence of
diff --git a/tests/ui/parser/extern-no-fn.rs b/tests/ui/parser/extern-no-fn.rs
index 73568609cdfce..e965b390f07a8 100644
--- a/tests/ui/parser/extern-no-fn.rs
+++ b/tests/ui/parser/extern-no-fn.rs
@@ -1,5 +1,7 @@
 extern "C" {
-    f(); //~ ERROR expected one of `!` or `::`, found `(`
+    f();
+    //~^ ERROR missing `fn` or `struct` for function or struct definition
+    //~| HELP if you meant to call a macro, try
 }
 
 fn main() {
diff --git a/tests/ui/parser/extern-no-fn.stderr b/tests/ui/parser/extern-no-fn.stderr
index 2e434afb218c9..03826e4a93b7a 100644
--- a/tests/ui/parser/extern-no-fn.stderr
+++ b/tests/ui/parser/extern-no-fn.stderr
@@ -1,12 +1,18 @@
-error: expected one of `!` or `::`, found `(`
-  --> $DIR/extern-no-fn.rs:2:6
+error: missing `fn` or `struct` for function or struct definition
+  --> $DIR/extern-no-fn.rs:2:5
    |
 LL | extern "C" {
    |            - while parsing this item list starting here
 LL |     f();
-   |      ^ expected one of `!` or `::`
+   |     ^
+...
 LL | }
    | - the item list ends here
+   |
+help: if you meant to call a macro, try
+   |
+LL |     f!();
+   |     ~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/parser/ice-issue-127600.rs b/tests/ui/parser/ice-issue-127600.rs
new file mode 100644
index 0000000000000..709c10253266d
--- /dev/null
+++ b/tests/ui/parser/ice-issue-127600.rs
@@ -0,0 +1,2 @@
+const!(&raw mut a);
+//~^ ERROR expected identifier, found `!`
diff --git a/tests/ui/parser/ice-issue-127600.stderr b/tests/ui/parser/ice-issue-127600.stderr
new file mode 100644
index 0000000000000..629fc4ae40b67
--- /dev/null
+++ b/tests/ui/parser/ice-issue-127600.stderr
@@ -0,0 +1,8 @@
+error: expected identifier, found `!`
+  --> $DIR/ice-issue-127600.rs:1:6
+   |
+LL | const!(&raw mut a);
+   |      ^ expected identifier
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/missing-enum-issue-125446.rs b/tests/ui/parser/missing-enum-issue-125446.rs
new file mode 100644
index 0000000000000..8d2cdb0dc40d8
--- /dev/null
+++ b/tests/ui/parser/missing-enum-issue-125446.rs
@@ -0,0 +1,6 @@
+Whoops {
+//~^ ERROR missing `enum` for enum definition
+//~| HELP add `enum` here to parse `Whoops` as an enum
+    OptionA,
+    OptionB,
+}
diff --git a/tests/ui/parser/missing-enum-issue-125446.stderr b/tests/ui/parser/missing-enum-issue-125446.stderr
new file mode 100644
index 0000000000000..113b147473ca1
--- /dev/null
+++ b/tests/ui/parser/missing-enum-issue-125446.stderr
@@ -0,0 +1,13 @@
+error: missing `enum` for enum definition
+  --> $DIR/missing-enum-issue-125446.rs:1:1
+   |
+LL | Whoops {
+   | ^^^^^^
+   |
+help: add `enum` here to parse `Whoops` as an enum
+   |
+LL | enum Whoops {
+   | ++++
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/missing-enum-or-struct-issue-125446.rs b/tests/ui/parser/missing-enum-or-struct-issue-125446.rs
new file mode 100644
index 0000000000000..c817ffaf859f7
--- /dev/null
+++ b/tests/ui/parser/missing-enum-or-struct-issue-125446.rs
@@ -0,0 +1,2 @@
+Whoops {}
+//~^ ERROR missing `enum` or `struct` for enum or struct definition
diff --git a/tests/ui/parser/missing-enum-or-struct-issue-125446.stderr b/tests/ui/parser/missing-enum-or-struct-issue-125446.stderr
new file mode 100644
index 0000000000000..15916cebf458c
--- /dev/null
+++ b/tests/ui/parser/missing-enum-or-struct-issue-125446.stderr
@@ -0,0 +1,8 @@
+error: missing `enum` or `struct` for enum or struct definition
+  --> $DIR/missing-enum-or-struct-issue-125446.rs:1:1
+   |
+LL | Whoops {}
+   | ^^^^^^
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/missing-fn-issue-125446.rs b/tests/ui/parser/missing-fn-issue-125446.rs
new file mode 100644
index 0000000000000..73c9c3a60e1fb
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-125446.rs
@@ -0,0 +1,7 @@
+whoops() {}
+//~^ ERROR missing `fn` for function definition
+//~| HELP add `fn` here to parse `whoops` as a function
+
+fn main() {
+    whoops();
+}
diff --git a/tests/ui/parser/missing-fn-issue-125446.stderr b/tests/ui/parser/missing-fn-issue-125446.stderr
new file mode 100644
index 0000000000000..2a92e0062cb9a
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-125446.stderr
@@ -0,0 +1,13 @@
+error: missing `fn` for function definition
+  --> $DIR/missing-fn-issue-125446.rs:1:1
+   |
+LL | whoops() {}
+   | ^^^^^^
+   |
+help: add `fn` here to parse `whoops` as a function
+   |
+LL | fn whoops() {}
+   | ++
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/missing-fn-issue-65381-1.rs b/tests/ui/parser/missing-fn-issue-65381-1.rs
new file mode 100644
index 0000000000000..ac0299ae37bd8
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-65381-1.rs
@@ -0,0 +1,4 @@
+main() {
+//~^ ERROR missing `fn` for function definition
+//~| HELP add `fn` here to parse `main` as a function
+}
diff --git a/tests/ui/parser/missing-fn-issue-65381-1.stderr b/tests/ui/parser/missing-fn-issue-65381-1.stderr
new file mode 100644
index 0000000000000..95ccd8518ee99
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-65381-1.stderr
@@ -0,0 +1,13 @@
+error: missing `fn` for function definition
+  --> $DIR/missing-fn-issue-65381-1.rs:1:1
+   |
+LL | main() {
+   | ^^^^
+   |
+help: add `fn` here to parse `main` as a function
+   |
+LL | fn main() {
+   | ++
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/missing-fn-issue-65381-2.rs b/tests/ui/parser/missing-fn-issue-65381-2.rs
new file mode 100644
index 0000000000000..e8c214a58b6cc
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-65381-2.rs
@@ -0,0 +1,3 @@
+main();
+//~^ ERROR missing `fn` or `struct` for function or struct definition
+//~| HELP if you meant to call a macro, try
diff --git a/tests/ui/parser/missing-fn-issue-65381-2.stderr b/tests/ui/parser/missing-fn-issue-65381-2.stderr
new file mode 100644
index 0000000000000..e13d395d70d7f
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-65381-2.stderr
@@ -0,0 +1,13 @@
+error: missing `fn` or `struct` for function or struct definition
+  --> $DIR/missing-fn-issue-65381-2.rs:1:1
+   |
+LL | main();
+   | ^^^^
+   |
+help: if you meant to call a macro, try
+   |
+LL | main!();
+   | ~~~~~
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/missing-fn-issue-65381-3.rs b/tests/ui/parser/missing-fn-issue-65381-3.rs
new file mode 100644
index 0000000000000..28e5b5aa430d0
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-65381-3.rs
@@ -0,0 +1,4 @@
+pub const initial_value() -> Self {
+//~^ ERROR missing `fn` for function definition
+//~| HELP add `fn` here to parse `initial_value` as a function
+}
diff --git a/tests/ui/parser/missing-fn-issue-65381-3.stderr b/tests/ui/parser/missing-fn-issue-65381-3.stderr
new file mode 100644
index 0000000000000..883295baede1a
--- /dev/null
+++ b/tests/ui/parser/missing-fn-issue-65381-3.stderr
@@ -0,0 +1,13 @@
+error: missing `fn` for function definition
+  --> $DIR/missing-fn-issue-65381-3.rs:1:11
+   |
+LL | pub const initial_value() -> Self {
+   |           ^^^^^^^^^^^^^
+   |
+help: add `fn` here to parse `initial_value` as a function
+   |
+LL | pub const fn initial_value() -> Self {
+   |           ++
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/missing-struct-issue-125446.rs b/tests/ui/parser/missing-struct-issue-125446.rs
new file mode 100644
index 0000000000000..439087aeec9f1
--- /dev/null
+++ b/tests/ui/parser/missing-struct-issue-125446.rs
@@ -0,0 +1,5 @@
+Whoops {
+//~^ ERROR missing `struct` for struct definition
+//~| HELP add `struct` here to parse `Whoops` as a struct
+    value: u64,
+}
diff --git a/tests/ui/parser/missing-struct-issue-125446.stderr b/tests/ui/parser/missing-struct-issue-125446.stderr
new file mode 100644
index 0000000000000..ff3135b2357be
--- /dev/null
+++ b/tests/ui/parser/missing-struct-issue-125446.stderr
@@ -0,0 +1,13 @@
+error: missing `struct` for struct definition
+  --> $DIR/missing-struct-issue-125446.rs:1:1
+   |
+LL | Whoops {
+   | ^^^^^^
+   |
+help: add `struct` here to parse `Whoops` as a struct
+   |
+LL | struct Whoops {
+   | ++++++
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/parser/suggest-assoc-const.stderr b/tests/ui/parser/suggest-assoc-const.stderr
index 6e29fad98d466..70ebeded31374 100644
--- a/tests/ui/parser/suggest-assoc-const.stderr
+++ b/tests/ui/parser/suggest-assoc-const.stderr
@@ -2,7 +2,12 @@ error: non-item in item list
   --> $DIR/suggest-assoc-const.rs:5:5
    |
 LL |     let _X: i32;
-   |     ^^^ help: consider using `const` instead of `let` for associated const: `const`
+   |     ^^^
+   |
+help: consider using `const` instead of `let` for associated const
+   |
+LL |     const _X: i32;
+   |     ~~~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/pattern/struct-parser-recovery-issue-126344.rs b/tests/ui/pattern/struct-parser-recovery-issue-126344.rs
new file mode 100644
index 0000000000000..1e3ce3e025e87
--- /dev/null
+++ b/tests/ui/pattern/struct-parser-recovery-issue-126344.rs
@@ -0,0 +1,42 @@
+struct Wrong {
+    x: i32; //~ ERROR struct fields are separated by `,`
+    y: i32,
+    z: i32,
+    h: i32,
+}
+
+fn oops(w: &Wrong) {
+    w.x;
+}
+
+fn foo(w: &Wrong) {
+    w.y;
+}
+
+fn haha(w: &Wrong) {
+    w.z;
+}
+
+struct WrongWithType {
+    x: 1, //~ ERROR expected type, found `1`
+    y: i32,
+    z: i32,
+    h: i32,
+}
+
+fn oops_type(w: &WrongWithType) {
+    w.x;
+}
+
+fn foo_type(w: &WrongWithType) {
+    w.y;
+}
+
+fn haha_type(w: &WrongWithType) {
+    w.z;
+}
+
+fn main() {
+    let v = Wrong { x: 1, y: 2, z: 3, h: 4 };
+    let x = WrongWithType { x: 1, y: 2, z: 3, h: 4 };
+}
diff --git a/tests/ui/pattern/struct-parser-recovery-issue-126344.stderr b/tests/ui/pattern/struct-parser-recovery-issue-126344.stderr
new file mode 100644
index 0000000000000..ef7f9c566db37
--- /dev/null
+++ b/tests/ui/pattern/struct-parser-recovery-issue-126344.stderr
@@ -0,0 +1,18 @@
+error: struct fields are separated by `,`
+  --> $DIR/struct-parser-recovery-issue-126344.rs:2:11
+   |
+LL | struct Wrong {
+   |        ----- while parsing this struct
+LL |     x: i32;
+   |           ^ help: replace `;` with `,`
+
+error: expected type, found `1`
+  --> $DIR/struct-parser-recovery-issue-126344.rs:21:8
+   |
+LL | struct WrongWithType {
+   |        ------------- while parsing this struct
+LL |     x: 1,
+   |        ^ expected type
+
+error: aborting due to 2 previous errors
+
diff --git a/tests/ui/proc-macro/load-panic-backtrace.rs b/tests/ui/proc-macro/load-panic-backtrace.rs
index 56ef4e9e08841..15badedef973d 100644
--- a/tests/ui/proc-macro/load-panic-backtrace.rs
+++ b/tests/ui/proc-macro/load-panic-backtrace.rs
@@ -1,8 +1,8 @@
 //@ aux-build:test-macros.rs
 //@ compile-flags: -Z proc-macro-backtrace
 //@ rustc-env:RUST_BACKTRACE=0
-//@ normalize-stderr-test "thread '.*' panicked " -> ""
-//@ normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
+//@ normalize-stderr-test: "thread '.*' panicked " -> ""
+//@ normalize-stderr-test: "note:.*RUST_BACKTRACE=1.*\n" -> ""
 //@ needs-unwind proc macro panics to report errors
 
 #[macro_use]
diff --git a/tests/ui/proc-macro/meta-macro-hygiene.rs b/tests/ui/proc-macro/meta-macro-hygiene.rs
index 9dac1030b9c7f..98496d5a4c609 100644
--- a/tests/ui/proc-macro/meta-macro-hygiene.rs
+++ b/tests/ui/proc-macro/meta-macro-hygiene.rs
@@ -4,9 +4,9 @@
 //@ compile-flags: -Z span-debug -Z macro-backtrace -Z unpretty=expanded,hygiene -Z trim-diagnostic-paths=no
 //@ check-pass
 // ignore-tidy-linelength
-//@ normalize-stdout-test "\d+#" -> "0#"
-//@ normalize-stdout-test "expn\d{3,}" -> "expnNNN"
-//@ normalize-stdout-test "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
+//@ normalize-stdout-test: "\d+#" -> "0#"
+//@ normalize-stdout-test: "expn\d{3,}" -> "expnNNN"
+//@ normalize-stdout-test: "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
 //
 // We don't care about symbol ids, so we set them all to 0
 // in the stdout
diff --git a/tests/ui/proc-macro/meta-macro-hygiene.stdout b/tests/ui/proc-macro/meta-macro-hygiene.stdout
index 8697ba58a3903..3c6ec6fbdd4ba 100644
--- a/tests/ui/proc-macro/meta-macro-hygiene.stdout
+++ b/tests/ui/proc-macro/meta-macro-hygiene.stdout
@@ -8,9 +8,9 @@ Respanned: TokenStream [Ident { ident: "$crate", span: $DIR/auxiliary/make-macro
 //@ compile-flags: -Z span-debug -Z macro-backtrace -Z unpretty=expanded,hygiene -Z trim-diagnostic-paths=no
 //@ check-pass
 // ignore-tidy-linelength
-//@ normalize-stdout-test "\d+#" -> "0#"
-//@ normalize-stdout-test "expn\d{3,}" -> "expnNNN"
-//@ normalize-stdout-test "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
+//@ normalize-stdout-test: "\d+#" -> "0#"
+//@ normalize-stdout-test: "expn\d{3,}" -> "expnNNN"
+//@ normalize-stdout-test: "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
 //
 // We don't care about symbol ids, so we set them all to 0
 // in the stdout
diff --git a/tests/ui/proc-macro/nonterminal-token-hygiene.rs b/tests/ui/proc-macro/nonterminal-token-hygiene.rs
index d1e42509584b4..6a4406b053d5e 100644
--- a/tests/ui/proc-macro/nonterminal-token-hygiene.rs
+++ b/tests/ui/proc-macro/nonterminal-token-hygiene.rs
@@ -4,9 +4,9 @@
 //@ compile-flags: -Z span-debug -Z macro-backtrace -Z unpretty=expanded,hygiene
 //@ compile-flags: -Z trim-diagnostic-paths=no
 // ignore-tidy-linelength
-//@ normalize-stdout-test "\d+#" -> "0#"
-//@ normalize-stdout-test "expn\d{3,}" -> "expnNNN"
-//@ normalize-stdout-test "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
+//@ normalize-stdout-test: "\d+#" -> "0#"
+//@ normalize-stdout-test: "expn\d{3,}" -> "expnNNN"
+//@ normalize-stdout-test: "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
 //@ aux-build:test-macros.rs
 
 #![feature(decl_macro)]
diff --git a/tests/ui/proc-macro/nonterminal-token-hygiene.stdout b/tests/ui/proc-macro/nonterminal-token-hygiene.stdout
index 2078e59b8b4b0..de3265e928141 100644
--- a/tests/ui/proc-macro/nonterminal-token-hygiene.stdout
+++ b/tests/ui/proc-macro/nonterminal-token-hygiene.stdout
@@ -28,9 +28,9 @@ PRINT-BANG INPUT (DEBUG): TokenStream [
 //@ compile-flags: -Z span-debug -Z macro-backtrace -Z unpretty=expanded,hygiene
 //@ compile-flags: -Z trim-diagnostic-paths=no
 // ignore-tidy-linelength
-//@ normalize-stdout-test "\d+#" -> "0#"
-//@ normalize-stdout-test "expn\d{3,}" -> "expnNNN"
-//@ normalize-stdout-test "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
+//@ normalize-stdout-test: "\d+#" -> "0#"
+//@ normalize-stdout-test: "expn\d{3,}" -> "expnNNN"
+//@ normalize-stdout-test: "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
 //@ aux-build:test-macros.rs
 
 #![feature /* 0#0 */(decl_macro)]
diff --git a/tests/ui/process/println-with-broken-pipe.rs b/tests/ui/process/println-with-broken-pipe.rs
index 798db3c0f8ca4..4ac1f7c98cbd1 100644
--- a/tests/ui/process/println-with-broken-pipe.rs
+++ b/tests/ui/process/println-with-broken-pipe.rs
@@ -5,7 +5,7 @@
 //@ ignore-fuchsia
 //@ ignore-horizon
 //@ ignore-android
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 //@ compile-flags: -Zon-broken-pipe=error
 
 // Test what the error message looks like when `println!()` panics because of
diff --git a/tests/ui/pub/pub-ident-fn-2.stderr b/tests/ui/pub/pub-ident-fn-2.stderr
index e724278b23390..80f4b14da8952 100644
--- a/tests/ui/pub/pub-ident-fn-2.stderr
+++ b/tests/ui/pub/pub-ident-fn-2.stderr
@@ -1,10 +1,10 @@
 error: missing `fn` for function definition
-  --> $DIR/pub-ident-fn-2.rs:3:4
+  --> $DIR/pub-ident-fn-2.rs:3:1
    |
 LL | pub foo(_s: usize) { bar() }
-   |    ^
+   | ^^^^^^^
    |
-help: add `fn` here to parse `foo` as a public function
+help: add `fn` here to parse `foo` as a function
    |
 LL | pub fn foo(_s: usize) { bar() }
    |     ++
diff --git a/tests/ui/pub/pub-ident-fn-or-struct.stderr b/tests/ui/pub/pub-ident-fn-or-struct.stderr
index a8fa4bd3bd3b4..ceadc510c63ef 100644
--- a/tests/ui/pub/pub-ident-fn-or-struct.stderr
+++ b/tests/ui/pub/pub-ident-fn-or-struct.stderr
@@ -1,8 +1,13 @@
 error: missing `fn` or `struct` for function or struct definition
-  --> $DIR/pub-ident-fn-or-struct.rs:1:4
+  --> $DIR/pub-ident-fn-or-struct.rs:1:1
    |
 LL | pub S (foo) bar
-   | ---^- help: if you meant to call a macro, try: `S!`
+   | ^^^^^
+   |
+help: if you meant to call a macro, try
+   |
+LL | pub S! (foo) bar
+   |     ~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/pub/pub-ident-fn-with-lifetime-2.rs b/tests/ui/pub/pub-ident-fn-with-lifetime-2.rs
index 1ee8c84f13bd3..3fb93cb669b74 100644
--- a/tests/ui/pub/pub-ident-fn-with-lifetime-2.rs
+++ b/tests/ui/pub/pub-ident-fn-with-lifetime-2.rs
@@ -1,4 +1,4 @@
-pub   bar<'a>(&self, _s: &'a usize) -> bool { true }
+pub bar<'a>(&self, _s: &'a usize) -> bool { true }
 //~^ ERROR missing `fn` for method definition
 
 fn main() {
diff --git a/tests/ui/pub/pub-ident-fn-with-lifetime-2.stderr b/tests/ui/pub/pub-ident-fn-with-lifetime-2.stderr
index b0d5ce9de5c98..e6523ca58ab43 100644
--- a/tests/ui/pub/pub-ident-fn-with-lifetime-2.stderr
+++ b/tests/ui/pub/pub-ident-fn-with-lifetime-2.stderr
@@ -1,10 +1,10 @@
 error: missing `fn` for method definition
-  --> $DIR/pub-ident-fn-with-lifetime-2.rs:1:4
+  --> $DIR/pub-ident-fn-with-lifetime-2.rs:1:1
    |
-LL | pub   bar<'a>(&self, _s: &'a usize) -> bool { true }
-   |    ^^^
+LL | pub bar<'a>(&self, _s: &'a usize) -> bool { true }
+   | ^^^^^^^
    |
-help: add `fn` here to parse `bar` as a public method
+help: add `fn` here to parse `bar` as a method
    |
 LL | pub fn bar<'a>(&self, _s: &'a usize) -> bool { true }
    |     ++
diff --git a/tests/ui/pub/pub-ident-fn-with-lifetime.rs b/tests/ui/pub/pub-ident-fn-with-lifetime.rs
index 8cdc152f163aa..0fd25ca0b1c63 100644
--- a/tests/ui/pub/pub-ident-fn-with-lifetime.rs
+++ b/tests/ui/pub/pub-ident-fn-with-lifetime.rs
@@ -1,6 +1,6 @@
 //@ run-rustfix
 
-pub   foo<'a>(_s: &'a usize) -> bool { true }
+pub foo<'a>(_s: &'a usize) -> bool { true }
 //~^ ERROR missing `fn` for function definition
 
 fn main() {
diff --git a/tests/ui/pub/pub-ident-fn-with-lifetime.stderr b/tests/ui/pub/pub-ident-fn-with-lifetime.stderr
index 63fcf6bf5d59a..52c6206a75fa6 100644
--- a/tests/ui/pub/pub-ident-fn-with-lifetime.stderr
+++ b/tests/ui/pub/pub-ident-fn-with-lifetime.stderr
@@ -1,10 +1,10 @@
 error: missing `fn` for function definition
-  --> $DIR/pub-ident-fn-with-lifetime.rs:3:4
+  --> $DIR/pub-ident-fn-with-lifetime.rs:3:1
    |
-LL | pub   foo<'a>(_s: &'a usize) -> bool { true }
-   |    ^^^
+LL | pub foo<'a>(_s: &'a usize) -> bool { true }
+   | ^^^^^^^
    |
-help: add `fn` here to parse `foo` as a public function
+help: add `fn` here to parse `foo` as a function
    |
 LL | pub fn foo<'a>(_s: &'a usize) -> bool { true }
    |     ++
diff --git a/tests/ui/pub/pub-ident-fn.rs b/tests/ui/pub/pub-ident-fn.rs
index 899ea82ccb7e7..1032f3375ea87 100644
--- a/tests/ui/pub/pub-ident-fn.rs
+++ b/tests/ui/pub/pub-ident-fn.rs
@@ -1,6 +1,6 @@
 //@ run-rustfix
 
-pub   foo(_s: usize) -> bool { true }
+pub foo(_s: usize) -> bool { true }
 //~^ ERROR missing `fn` for function definition
 
 fn main() {
diff --git a/tests/ui/pub/pub-ident-fn.stderr b/tests/ui/pub/pub-ident-fn.stderr
index 06dac616443b8..54360061fefed 100644
--- a/tests/ui/pub/pub-ident-fn.stderr
+++ b/tests/ui/pub/pub-ident-fn.stderr
@@ -1,10 +1,10 @@
 error: missing `fn` for function definition
-  --> $DIR/pub-ident-fn.rs:3:4
+  --> $DIR/pub-ident-fn.rs:3:1
    |
-LL | pub   foo(_s: usize) -> bool { true }
-   |    ^^^
+LL | pub foo(_s: usize) -> bool { true }
+   | ^^^^^^^
    |
-help: add `fn` here to parse `foo` as a public function
+help: add `fn` here to parse `foo` as a function
    |
 LL | pub fn foo(_s: usize) -> bool { true }
    |     ++
diff --git a/tests/ui/pub/pub-ident-struct-2.stderr b/tests/ui/pub/pub-ident-struct-2.stderr
index 5e0f328d98616..ef2ff1d2f0efe 100644
--- a/tests/ui/pub/pub-ident-struct-2.stderr
+++ b/tests/ui/pub/pub-ident-struct-2.stderr
@@ -1,10 +1,10 @@
 error: missing `struct` for struct definition
-  --> $DIR/pub-ident-struct-2.rs:4:8
+  --> $DIR/pub-ident-struct-2.rs:4:5
    |
 LL |     pub bar();
-   |        ^
+   |     ^^^^^^^
    |
-help: add `struct` here to parse `bar` as a public struct
+help: add `struct` here to parse `bar` as a struct
    |
 LL |     pub struct bar();
    |         ++++++
diff --git a/tests/ui/pub/pub-ident-struct-3.stderr b/tests/ui/pub/pub-ident-struct-3.stderr
index d08e5120570c8..0a23ad51211b6 100644
--- a/tests/ui/pub/pub-ident-struct-3.stderr
+++ b/tests/ui/pub/pub-ident-struct-3.stderr
@@ -1,10 +1,10 @@
 error: missing `struct` for struct definition
-  --> $DIR/pub-ident-struct-3.rs:1:4
+  --> $DIR/pub-ident-struct-3.rs:1:1
    |
 LL | pub S();
-   |    ^
+   | ^^^^^
    |
-help: add `struct` here to parse `S` as a public struct
+help: add `struct` here to parse `S` as a struct
    |
 LL | pub struct S();
    |     ++++++
diff --git a/tests/ui/pub/pub-ident-struct-4.stderr b/tests/ui/pub/pub-ident-struct-4.stderr
index ec1367832113b..d3072464e05cd 100644
--- a/tests/ui/pub/pub-ident-struct-4.stderr
+++ b/tests/ui/pub/pub-ident-struct-4.stderr
@@ -1,10 +1,10 @@
 error: missing `struct` for struct definition
-  --> $DIR/pub-ident-struct-4.rs:4:4
+  --> $DIR/pub-ident-struct-4.rs:4:1
    |
 LL | pub T(String);
-   |    ^
+   | ^^^^^
    |
-help: add `struct` here to parse `T` as a public struct
+help: add `struct` here to parse `T` as a struct
    |
 LL | pub struct T(String);
    |     ++++++
diff --git a/tests/ui/pub/pub-ident-struct-with-lifetime.rs b/tests/ui/pub/pub-ident-struct-with-lifetime.rs
index 2feb0266070d5..baa5dc8cfb95f 100644
--- a/tests/ui/pub/pub-ident-struct-with-lifetime.rs
+++ b/tests/ui/pub/pub-ident-struct-with-lifetime.rs
@@ -1,4 +1,4 @@
 pub S<'a> {
-//~^ ERROR missing `struct` for struct definition
+//~^ ERROR missing `enum` or `struct` for enum or struct definition
 }
 fn main() {}
diff --git a/tests/ui/pub/pub-ident-struct-with-lifetime.stderr b/tests/ui/pub/pub-ident-struct-with-lifetime.stderr
index 0e08a5ff44922..1367c941f8061 100644
--- a/tests/ui/pub/pub-ident-struct-with-lifetime.stderr
+++ b/tests/ui/pub/pub-ident-struct-with-lifetime.stderr
@@ -1,13 +1,8 @@
-error: missing `struct` for struct definition
-  --> $DIR/pub-ident-struct-with-lifetime.rs:1:4
+error: missing `enum` or `struct` for enum or struct definition
+  --> $DIR/pub-ident-struct-with-lifetime.rs:1:1
    |
 LL | pub S<'a> {
-   |    ^
-   |
-help: add `struct` here to parse `S` as a public struct
-   |
-LL | pub struct S<'a> {
-   |     ++++++
+   | ^^^^^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/pub/pub-ident-struct.fixed b/tests/ui/pub/pub-ident-struct.fixed
deleted file mode 100644
index 3f0610cd765c2..0000000000000
--- a/tests/ui/pub/pub-ident-struct.fixed
+++ /dev/null
@@ -1,6 +0,0 @@
-//@ run-rustfix
-
-pub struct S {
-//~^ ERROR missing `struct` for struct definition
-}
-fn main() {}
diff --git a/tests/ui/pub/pub-ident-struct.rs b/tests/ui/pub/pub-ident-struct.rs
index 6d06c406f6c7e..f9f31a9ed2b2b 100644
--- a/tests/ui/pub/pub-ident-struct.rs
+++ b/tests/ui/pub/pub-ident-struct.rs
@@ -1,6 +1,4 @@
-//@ run-rustfix
-
 pub S {
-//~^ ERROR missing `struct` for struct definition
+//~^ ERROR missing `enum` or `struct` for enum or struct definition
 }
 fn main() {}
diff --git a/tests/ui/pub/pub-ident-struct.stderr b/tests/ui/pub/pub-ident-struct.stderr
index 2d5d61d938107..6d85305ceaffa 100644
--- a/tests/ui/pub/pub-ident-struct.stderr
+++ b/tests/ui/pub/pub-ident-struct.stderr
@@ -1,13 +1,8 @@
-error: missing `struct` for struct definition
-  --> $DIR/pub-ident-struct.rs:3:4
+error: missing `enum` or `struct` for enum or struct definition
+  --> $DIR/pub-ident-struct.rs:1:1
    |
 LL | pub S {
-   |    ^
-   |
-help: add `struct` here to parse `S` as a public struct
-   |
-LL | pub struct S {
-   |     ++++++
+   | ^^^^^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/pub/pub-ident-with-lifetime-incomplete.rs b/tests/ui/pub/pub-ident-with-lifetime-incomplete.rs
index c86a9f2fdd655..dec1a5026468b 100644
--- a/tests/ui/pub/pub-ident-with-lifetime-incomplete.rs
+++ b/tests/ui/pub/pub-ident-with-lifetime-incomplete.rs
@@ -1,5 +1,5 @@
 fn main() {
 }
 
-pub   foo<'a>
+pub foo<'a>
 //~^ ERROR missing `fn` or `struct` for function or struct definition
diff --git a/tests/ui/pub/pub-ident-with-lifetime-incomplete.stderr b/tests/ui/pub/pub-ident-with-lifetime-incomplete.stderr
index 750e2d17e0ad1..67b6b9c7ba8a5 100644
--- a/tests/ui/pub/pub-ident-with-lifetime-incomplete.stderr
+++ b/tests/ui/pub/pub-ident-with-lifetime-incomplete.stderr
@@ -1,8 +1,8 @@
 error: missing `fn` or `struct` for function or struct definition
-  --> $DIR/pub-ident-with-lifetime-incomplete.rs:4:4
+  --> $DIR/pub-ident-with-lifetime-incomplete.rs:4:1
    |
-LL | pub   foo<'a>
-   |    ^^^
+LL | pub foo<'a>
+   | ^^^^^^^
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/repeat-expr/repeat_count.stderr b/tests/ui/repeat-expr/repeat_count.stderr
index 8a1ed8f3b9c7c..350ac287507a3 100644
--- a/tests/ui/repeat-expr/repeat_count.stderr
+++ b/tests/ui/repeat-expr/repeat_count.stderr
@@ -1,10 +1,13 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/repeat_count.rs:5:17
    |
-LL |     let n = 1;
-   |     ----- help: consider using `const` instead of `let`: `const n`
 LL |     let a = [0; n];
    |                 ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const n: /* Type */ = 1;
+   |     ~~~~~  ++++++++++++
 
 error[E0308]: mismatched types
   --> $DIR/repeat_count.rs:7:17
diff --git a/tests/ui/repr/repr-c-dead-variants.rs b/tests/ui/repr/repr-c-dead-variants.rs
index f113588e83fe9..cc080b2e59ad7 100644
--- a/tests/ui/repr/repr-c-dead-variants.rs
+++ b/tests/ui/repr/repr-c-dead-variants.rs
@@ -6,7 +6,7 @@
 
 // See also: repr-c-int-dead-variants.rs
 
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
 
 // This test depends on the value of the `c_enum_min_bits` target option.
 // As there's no way to actually check it from UI test, we only run this test on a subset of archs.
diff --git a/tests/ui/repr/repr-c-int-dead-variants.rs b/tests/ui/repr/repr-c-int-dead-variants.rs
index 8d2b39bd6486e..ed26174343a48 100644
--- a/tests/ui/repr/repr-c-int-dead-variants.rs
+++ b/tests/ui/repr/repr-c-int-dead-variants.rs
@@ -3,7 +3,7 @@
 
 // See also: repr-c-dead-variants.rs
 
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
 
 // A simple uninhabited type.
 enum Void {}
diff --git a/tests/ui/resolve/multiple_definitions_attribute_merging.rs b/tests/ui/resolve/multiple_definitions_attribute_merging.rs
index 523717861e1ba..7d649476ad2a4 100644
--- a/tests/ui/resolve/multiple_definitions_attribute_merging.rs
+++ b/tests/ui/resolve/multiple_definitions_attribute_merging.rs
@@ -4,9 +4,9 @@
 
 //@known-bug: #120873
 //@ failure-status: 101
-//@ normalize-stderr-test "note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
-//@ normalize-stderr-test "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
+//@ normalize-stderr-test: "note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*\n" -> ""
+//@ normalize-stderr-test: "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
 //@ rustc-env:RUST_BACKTRACE=0
 
 #[repr(packed)]
diff --git a/tests/ui/resolve/proc_macro_generated_packed.rs b/tests/ui/resolve/proc_macro_generated_packed.rs
index 34a7e4db6030d..e8d04f808d03b 100644
--- a/tests/ui/resolve/proc_macro_generated_packed.rs
+++ b/tests/ui/resolve/proc_macro_generated_packed.rs
@@ -4,9 +4,9 @@
 //@aux-build: proc_macro_generate_packed.rs
 //@known-bug: #120873
 //@ failure-status: 101
-//@ normalize-stderr-test "note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
-//@ normalize-stderr-test "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
+//@ normalize-stderr-test: "note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*\n" -> ""
+//@ normalize-stderr-test: "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
 //@ rustc-env:RUST_BACKTRACE=0
 
 extern crate proc_macro_generate_packed;
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/minicore.rs b/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/minicore.rs
index 63c353c7d6627..3c6d4757fea2a 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/minicore.rs
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/minicore.rs
@@ -1,7 +1,7 @@
 //@ known-bug: #110395
 //@ failure-status: 101
-//@ normalize-stderr-test ".*note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*:\n.*\n" -> ""
+//@ normalize-stderr-test: ".*note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*:\n.*\n" -> ""
 //@ rustc-env:RUST_BACKTRACE=0
 // FIXME(effects) check-pass
 //@ compile-flags: -Znext-solver
diff --git a/tests/ui/statics/missing_lifetime.rs b/tests/ui/statics/missing_lifetime.rs
new file mode 100644
index 0000000000000..e6a63ef221c6a
--- /dev/null
+++ b/tests/ui/statics/missing_lifetime.rs
@@ -0,0 +1,9 @@
+//! This test checks that we taint typeck results when there are
+//! error lifetimes, even though typeck doesn't actually care about lifetimes.
+
+struct Slice(&'reborrow [&'static [u8]]);
+//~^ ERROR undeclared lifetime
+
+static MAP: Slice = Slice(&[b"" as &'static [u8]]);
+
+fn main() {}
diff --git a/tests/ui/statics/missing_lifetime.stderr b/tests/ui/statics/missing_lifetime.stderr
new file mode 100644
index 0000000000000..e23b27f7a6a6d
--- /dev/null
+++ b/tests/ui/statics/missing_lifetime.stderr
@@ -0,0 +1,11 @@
+error[E0261]: use of undeclared lifetime name `'reborrow`
+  --> $DIR/missing_lifetime.rs:4:15
+   |
+LL | struct Slice(&'reborrow [&'static [u8]]);
+   |             - ^^^^^^^^^ undeclared lifetime
+   |             |
+   |             help: consider introducing lifetime `'reborrow` here: `<'reborrow>`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0261`.
diff --git a/tests/ui/statics/mutable_memory_validation.rs b/tests/ui/statics/mutable_memory_validation.rs
index fcf6ad1627772..470229d5fa7cd 100644
--- a/tests/ui/statics/mutable_memory_validation.rs
+++ b/tests/ui/statics/mutable_memory_validation.rs
@@ -1,8 +1,8 @@
 //issue: rust-lang/rust#122548
 
 // Strip out raw byte dumps to make comparison platform-independent:
-//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
-//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
+//@ normalize-stderr-test: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
+//@ normalize-stderr-test: "([0-9a-f][0-9a-f] |╾─*A(LLOC)?[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
 
 #![feature(const_mut_refs)]
 #![feature(const_refs_to_static)]
diff --git a/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.fixed b/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.fixed
index e072c476c6bc7..4e562193f0d89 100644
--- a/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.fixed
+++ b/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.fixed
@@ -3,9 +3,9 @@
 
 trait Trait {}
 
-fn assert_send(ptr: *mut dyn Trait) -> *mut (dyn Trait + Send) {
+fn assert_send() -> *mut (dyn Trait + Send) {
     //~^ ERROR incorrect parentheses around trait bounds
-    ptr as _
+    loop {}
 }
 
 fn foo2(_: &(dyn Trait + Send)) {}
diff --git a/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.rs b/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.rs
index 8899514142632..4a00059400c04 100644
--- a/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.rs
+++ b/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.rs
@@ -3,9 +3,9 @@
 
 trait Trait {}
 
-fn assert_send(ptr: *mut dyn Trait) -> *mut dyn (Trait + Send) {
+fn assert_send() -> *mut dyn (Trait + Send) {
     //~^ ERROR incorrect parentheses around trait bounds
-    ptr as _
+    loop {}
 }
 
 fn foo2(_: &dyn (Trait + Send)) {}
diff --git a/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.stderr b/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.stderr
index 2d1abe91a1eb7..c67557fa14f97 100644
--- a/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.stderr
+++ b/tests/ui/suggestions/issue-114797-bad-parentheses-dyn-trait.stderr
@@ -1,13 +1,13 @@
 error: incorrect parentheses around trait bounds
-  --> $DIR/issue-114797-bad-parentheses-dyn-trait.rs:6:49
+  --> $DIR/issue-114797-bad-parentheses-dyn-trait.rs:6:30
    |
-LL | fn assert_send(ptr: *mut dyn Trait) -> *mut dyn (Trait + Send) {
-   |                                                 ^            ^
+LL | fn assert_send() -> *mut dyn (Trait + Send) {
+   |                              ^            ^
    |
 help: fix the parentheses
    |
-LL - fn assert_send(ptr: *mut dyn Trait) -> *mut dyn (Trait + Send) {
-LL + fn assert_send(ptr: *mut dyn Trait) -> *mut (dyn Trait + Send) {
+LL - fn assert_send() -> *mut dyn (Trait + Send) {
+LL + fn assert_send() -> *mut (dyn Trait + Send) {
    |
 
 error: incorrect parentheses around trait bounds
diff --git a/tests/ui/test-attrs/terse.rs b/tests/ui/test-attrs/terse.rs
index ab9d5cc19bd6c..74e189158570f 100644
--- a/tests/ui/test-attrs/terse.rs
+++ b/tests/ui/test-attrs/terse.rs
@@ -3,7 +3,7 @@
 //@ run-flags: --test-threads=1 --quiet
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ ignore-emscripten no threads support
 //@ needs-unwind
 
diff --git a/tests/ui/test-attrs/test-filter-multiple.rs b/tests/ui/test-attrs/test-filter-multiple.rs
index 05fc022834aea..c875929e67242 100644
--- a/tests/ui/test-attrs/test-filter-multiple.rs
+++ b/tests/ui/test-attrs/test-filter-multiple.rs
@@ -2,7 +2,7 @@
 //@ compile-flags: --test
 //@ run-flags: --test-threads=1 test1 test2
 //@ check-run-results
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ needs-threads
 
 #[test]
diff --git a/tests/ui/test-attrs/test-panic-abort-nocapture.rs b/tests/ui/test-attrs/test-panic-abort-nocapture.rs
index 03c175a2a49ff..c2c3d6d547d6c 100644
--- a/tests/ui/test-attrs/test-panic-abort-nocapture.rs
+++ b/tests/ui/test-attrs/test-panic-abort-nocapture.rs
@@ -4,12 +4,13 @@
 //@ run-fail
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 //@ ignore-android #120567
 //@ ignore-wasm no panic or subprocess support
 //@ ignore-emscripten no panic or subprocess support
 //@ ignore-sgx no subprocess support
+//@ ignore-fuchsia code returned as ZX_TASK_RETCODE_EXCEPTION_KILL, FIXME (#127539)
 
 #![cfg(test)]
 
diff --git a/tests/ui/test-attrs/test-panic-abort-nocapture.run.stderr b/tests/ui/test-attrs/test-panic-abort-nocapture.run.stderr
index 16001b3eecd4d..4c94518d4d197 100644
--- a/tests/ui/test-attrs/test-panic-abort-nocapture.run.stderr
+++ b/tests/ui/test-attrs/test-panic-abort-nocapture.run.stderr
@@ -1,9 +1,9 @@
-thread 'main' panicked at $DIR/test-panic-abort-nocapture.rs:34:5:
+thread 'main' panicked at $DIR/test-panic-abort-nocapture.rs:35:5:
 assertion `left == right` failed
   left: 2
  right: 4
 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
-thread 'main' panicked at $DIR/test-panic-abort-nocapture.rs:28:5:
+thread 'main' panicked at $DIR/test-panic-abort-nocapture.rs:29:5:
 assertion `left == right` failed
   left: 2
  right: 4
diff --git a/tests/ui/test-attrs/test-panic-abort.rs b/tests/ui/test-attrs/test-panic-abort.rs
index 77efaf05bbc0d..0c44acaffd77b 100644
--- a/tests/ui/test-attrs/test-panic-abort.rs
+++ b/tests/ui/test-attrs/test-panic-abort.rs
@@ -4,12 +4,13 @@
 //@ run-fail
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 //@ ignore-android #120567
 //@ ignore-wasm no panic or subprocess support
 //@ ignore-emscripten no panic or subprocess support
 //@ ignore-sgx no subprocess support
+//@ ignore-fuchsia code returned as ZX_TASK_RETCODE_EXCEPTION_KILL, FIXME (#127539)
 
 #![cfg(test)]
 #![feature(test)]
diff --git a/tests/ui/test-attrs/test-panic-abort.run.stdout b/tests/ui/test-attrs/test-panic-abort.run.stdout
index f5d14e77da963..25105f38fcf78 100644
--- a/tests/ui/test-attrs/test-panic-abort.run.stdout
+++ b/tests/ui/test-attrs/test-panic-abort.run.stdout
@@ -17,7 +17,7 @@ hello, world
 testing123
 ---- it_fails stderr ----
 testing321
-thread 'main' panicked at $DIR/test-panic-abort.rs:39:5:
+thread 'main' panicked at $DIR/test-panic-abort.rs:40:5:
 assertion `left == right` failed
   left: 2
  right: 5
diff --git a/tests/ui/test-attrs/test-passed.rs b/tests/ui/test-attrs/test-passed.rs
index f43f66a6edf5e..2a3fca7f002e9 100644
--- a/tests/ui/test-attrs/test-passed.rs
+++ b/tests/ui/test-attrs/test-passed.rs
@@ -3,7 +3,7 @@
 //@ run-flags: --test-threads=1
 //@ run-pass
 //@ check-run-results
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 
 // Tests the output of the test harness with only passed tests.
 
diff --git a/tests/ui/test-attrs/test-thread-capture.rs b/tests/ui/test-attrs/test-thread-capture.rs
index d770964125fba..75ff4e0ece64f 100644
--- a/tests/ui/test-attrs/test-thread-capture.rs
+++ b/tests/ui/test-attrs/test-thread-capture.rs
@@ -3,7 +3,7 @@
 //@ run-flags: --test-threads=1
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ ignore-emscripten no threads support
 //@ needs-unwind
 
diff --git a/tests/ui/test-attrs/test-thread-nocapture.rs b/tests/ui/test-attrs/test-thread-nocapture.rs
index 58e5f7e33cb75..6a36ea8d7d196 100644
--- a/tests/ui/test-attrs/test-thread-nocapture.rs
+++ b/tests/ui/test-attrs/test-thread-nocapture.rs
@@ -3,7 +3,7 @@
 //@ run-flags: --test-threads=1 --nocapture
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ ignore-emscripten no threads support
 //@ needs-unwind
 
diff --git a/tests/ui/test-attrs/test-type.rs b/tests/ui/test-attrs/test-type.rs
index 7db7e31d01daa..1b71ead55b077 100644
--- a/tests/ui/test-attrs/test-type.rs
+++ b/tests/ui/test-attrs/test-type.rs
@@ -1,7 +1,7 @@
 //@ compile-flags: --test -Zpanic-abort-tests
 //@ run-flags: --test-threads=1
 //@ check-run-results
-//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ needs-threads
 //@ run-pass
 
diff --git a/tests/ui/thir-print/thir-tree-match.stdout b/tests/ui/thir-print/thir-tree-match.stdout
index 31c46716a006d..b2431698cc645 100644
--- a/tests/ui/thir-print/thir-tree-match.stdout
+++ b/tests/ui/thir-print/thir-tree-match.stdout
@@ -92,7 +92,7 @@ body:
                                                                                         adt_def: 
                                                                                             AdtDef {
                                                                                                 did: DefId(0:10 ~ thir_tree_match[fcf8]::Foo)
-                                                                                                variants: [VariantDef { def_id: DefId(0:11 ~ thir_tree_match[fcf8]::Foo::FooOne), ctor: Some((Fn, DefId(0:12 ~ thir_tree_match[fcf8]::Foo::FooOne::{constructor#0}))), name: "FooOne", discr: Relative(0), fields: [FieldDef { did: DefId(0:13 ~ thir_tree_match[fcf8]::Foo::FooOne::0), name: "0", vis: Restricted(DefId(0:0 ~ thir_tree_match[fcf8])) }], flags:  }, VariantDef { def_id: DefId(0:14 ~ thir_tree_match[fcf8]::Foo::FooTwo), ctor: Some((Const, DefId(0:15 ~ thir_tree_match[fcf8]::Foo::FooTwo::{constructor#0}))), name: "FooTwo", discr: Relative(1), fields: [], flags:  }]
+                                                                                                variants: [VariantDef { def_id: DefId(0:11 ~ thir_tree_match[fcf8]::Foo::FooOne), ctor: Some((Fn, DefId(0:12 ~ thir_tree_match[fcf8]::Foo::FooOne::{constructor#0}))), name: "FooOne", discr: Relative(0), fields: [FieldDef { did: DefId(0:13 ~ thir_tree_match[fcf8]::Foo::FooOne::0), name: "0", vis: Restricted(DefId(0:0 ~ thir_tree_match[fcf8])) }], tainted: None, flags:  }, VariantDef { def_id: DefId(0:14 ~ thir_tree_match[fcf8]::Foo::FooTwo), ctor: Some((Const, DefId(0:15 ~ thir_tree_match[fcf8]::Foo::FooTwo::{constructor#0}))), name: "FooTwo", discr: Relative(1), fields: [], tainted: None, flags:  }]
                                                                                                 flags: IS_ENUM
                                                                                                 repr: ReprOptions { int: None, align: None, pack: None, flags: , field_shuffle_seed: 3477539199540094892 }
                                                                                         args: []
@@ -106,7 +106,7 @@ body:
                                                                                                         adt_def: 
                                                                                                             AdtDef {
                                                                                                                 did: DefId(0:3 ~ thir_tree_match[fcf8]::Bar)
-                                                                                                                variants: [VariantDef { def_id: DefId(0:4 ~ thir_tree_match[fcf8]::Bar::First), ctor: Some((Const, DefId(0:5 ~ thir_tree_match[fcf8]::Bar::First::{constructor#0}))), name: "First", discr: Relative(0), fields: [], flags:  }, VariantDef { def_id: DefId(0:6 ~ thir_tree_match[fcf8]::Bar::Second), ctor: Some((Const, DefId(0:7 ~ thir_tree_match[fcf8]::Bar::Second::{constructor#0}))), name: "Second", discr: Relative(1), fields: [], flags:  }, VariantDef { def_id: DefId(0:8 ~ thir_tree_match[fcf8]::Bar::Third), ctor: Some((Const, DefId(0:9 ~ thir_tree_match[fcf8]::Bar::Third::{constructor#0}))), name: "Third", discr: Relative(2), fields: [], flags:  }]
+                                                                                                                variants: [VariantDef { def_id: DefId(0:4 ~ thir_tree_match[fcf8]::Bar::First), ctor: Some((Const, DefId(0:5 ~ thir_tree_match[fcf8]::Bar::First::{constructor#0}))), name: "First", discr: Relative(0), fields: [], tainted: None, flags:  }, VariantDef { def_id: DefId(0:6 ~ thir_tree_match[fcf8]::Bar::Second), ctor: Some((Const, DefId(0:7 ~ thir_tree_match[fcf8]::Bar::Second::{constructor#0}))), name: "Second", discr: Relative(1), fields: [], tainted: None, flags:  }, VariantDef { def_id: DefId(0:8 ~ thir_tree_match[fcf8]::Bar::Third), ctor: Some((Const, DefId(0:9 ~ thir_tree_match[fcf8]::Bar::Third::{constructor#0}))), name: "Third", discr: Relative(2), fields: [], tainted: None, flags:  }]
                                                                                                                 flags: IS_ENUM
                                                                                                                 repr: ReprOptions { int: None, align: None, pack: None, flags: , field_shuffle_seed: 10333377570083945360 }
                                                                                                         args: []
@@ -154,7 +154,7 @@ body:
                                                                                         adt_def: 
                                                                                             AdtDef {
                                                                                                 did: DefId(0:10 ~ thir_tree_match[fcf8]::Foo)
-                                                                                                variants: [VariantDef { def_id: DefId(0:11 ~ thir_tree_match[fcf8]::Foo::FooOne), ctor: Some((Fn, DefId(0:12 ~ thir_tree_match[fcf8]::Foo::FooOne::{constructor#0}))), name: "FooOne", discr: Relative(0), fields: [FieldDef { did: DefId(0:13 ~ thir_tree_match[fcf8]::Foo::FooOne::0), name: "0", vis: Restricted(DefId(0:0 ~ thir_tree_match[fcf8])) }], flags:  }, VariantDef { def_id: DefId(0:14 ~ thir_tree_match[fcf8]::Foo::FooTwo), ctor: Some((Const, DefId(0:15 ~ thir_tree_match[fcf8]::Foo::FooTwo::{constructor#0}))), name: "FooTwo", discr: Relative(1), fields: [], flags:  }]
+                                                                                                variants: [VariantDef { def_id: DefId(0:11 ~ thir_tree_match[fcf8]::Foo::FooOne), ctor: Some((Fn, DefId(0:12 ~ thir_tree_match[fcf8]::Foo::FooOne::{constructor#0}))), name: "FooOne", discr: Relative(0), fields: [FieldDef { did: DefId(0:13 ~ thir_tree_match[fcf8]::Foo::FooOne::0), name: "0", vis: Restricted(DefId(0:0 ~ thir_tree_match[fcf8])) }], tainted: None, flags:  }, VariantDef { def_id: DefId(0:14 ~ thir_tree_match[fcf8]::Foo::FooTwo), ctor: Some((Const, DefId(0:15 ~ thir_tree_match[fcf8]::Foo::FooTwo::{constructor#0}))), name: "FooTwo", discr: Relative(1), fields: [], tainted: None, flags:  }]
                                                                                                 flags: IS_ENUM
                                                                                                 repr: ReprOptions { int: None, align: None, pack: None, flags: , field_shuffle_seed: 3477539199540094892 }
                                                                                         args: []
@@ -206,7 +206,7 @@ body:
                                                                                         adt_def: 
                                                                                             AdtDef {
                                                                                                 did: DefId(0:10 ~ thir_tree_match[fcf8]::Foo)
-                                                                                                variants: [VariantDef { def_id: DefId(0:11 ~ thir_tree_match[fcf8]::Foo::FooOne), ctor: Some((Fn, DefId(0:12 ~ thir_tree_match[fcf8]::Foo::FooOne::{constructor#0}))), name: "FooOne", discr: Relative(0), fields: [FieldDef { did: DefId(0:13 ~ thir_tree_match[fcf8]::Foo::FooOne::0), name: "0", vis: Restricted(DefId(0:0 ~ thir_tree_match[fcf8])) }], flags:  }, VariantDef { def_id: DefId(0:14 ~ thir_tree_match[fcf8]::Foo::FooTwo), ctor: Some((Const, DefId(0:15 ~ thir_tree_match[fcf8]::Foo::FooTwo::{constructor#0}))), name: "FooTwo", discr: Relative(1), fields: [], flags:  }]
+                                                                                                variants: [VariantDef { def_id: DefId(0:11 ~ thir_tree_match[fcf8]::Foo::FooOne), ctor: Some((Fn, DefId(0:12 ~ thir_tree_match[fcf8]::Foo::FooOne::{constructor#0}))), name: "FooOne", discr: Relative(0), fields: [FieldDef { did: DefId(0:13 ~ thir_tree_match[fcf8]::Foo::FooOne::0), name: "0", vis: Restricted(DefId(0:0 ~ thir_tree_match[fcf8])) }], tainted: None, flags:  }, VariantDef { def_id: DefId(0:14 ~ thir_tree_match[fcf8]::Foo::FooTwo), ctor: Some((Const, DefId(0:15 ~ thir_tree_match[fcf8]::Foo::FooTwo::{constructor#0}))), name: "FooTwo", discr: Relative(1), fields: [], tainted: None, flags:  }]
                                                                                                 flags: IS_ENUM
                                                                                                 repr: ReprOptions { int: None, align: None, pack: None, flags: , field_shuffle_seed: 3477539199540094892 }
                                                                                         args: []
diff --git a/tests/ui/tool-attributes/invalid-tool.rs b/tests/ui/tool-attributes/invalid-tool.rs
new file mode 100644
index 0000000000000..125333231d217
--- /dev/null
+++ b/tests/ui/tool-attributes/invalid-tool.rs
@@ -0,0 +1,6 @@
+#![feature(register_tool)]
+
+#![register_tool(1)]
+//~^ ERROR `register_tool` only accepts identifiers
+
+fn main() {}
diff --git a/tests/ui/tool-attributes/invalid-tool.stderr b/tests/ui/tool-attributes/invalid-tool.stderr
new file mode 100644
index 0000000000000..deafa6d167c20
--- /dev/null
+++ b/tests/ui/tool-attributes/invalid-tool.stderr
@@ -0,0 +1,8 @@
+error: `register_tool` only accepts identifiers
+  --> $DIR/invalid-tool.rs:3:18
+   |
+LL | #![register_tool(1)]
+   |                  ^ not an identifier
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/track-diagnostics/track.rs b/tests/ui/track-diagnostics/track.rs
index 4b984171480ea..5023f34e4c1b2 100644
--- a/tests/ui/track-diagnostics/track.rs
+++ b/tests/ui/track-diagnostics/track.rs
@@ -5,13 +5,13 @@
 
 // Normalize the emitted location so this doesn't need
 // updating everytime someone adds or removes a line.
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
-//@ normalize-stderr-test "note: rustc .+ running on .+" -> "note: rustc $$VERSION running on $$TARGET"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: "note: rustc .+ running on .+" -> "note: rustc $$VERSION running on $$TARGET"
 
 // The test becomes too flaky if we care about exact args. If `-Z ui-testing`
 // from compiletest and `-Z track-diagnostics` from `// compile-flags` at the
 // top of this file are present, then assume all args are present.
-//@ normalize-stderr-test "note: compiler flags: .*-Z ui-testing.*-Z track-diagnostics" -> "note: compiler flags: ... -Z ui-testing ... -Z track-diagnostics"
+//@ normalize-stderr-test: "note: compiler flags: .*-Z ui-testing.*-Z track-diagnostics" -> "note: compiler flags: ... -Z ui-testing ... -Z track-diagnostics"
 
 fn main() {
     break rust
diff --git a/tests/ui/track-diagnostics/track2.rs b/tests/ui/track-diagnostics/track2.rs
index 00a17ccb2910d..7466e9246ce61 100644
--- a/tests/ui/track-diagnostics/track2.rs
+++ b/tests/ui/track-diagnostics/track2.rs
@@ -3,7 +3,7 @@
 
 // Normalize the emitted location so this doesn't need
 // updating everytime someone adds or removes a line.
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 
 fn main() {
     let _moved @ _from = String::from("foo");
diff --git a/tests/ui/track-diagnostics/track3.rs b/tests/ui/track-diagnostics/track3.rs
index 2d0efdc839f9b..43ad1dff8b83a 100644
--- a/tests/ui/track-diagnostics/track3.rs
+++ b/tests/ui/track-diagnostics/track3.rs
@@ -3,7 +3,7 @@
 
 // Normalize the emitted location so this doesn't need
 // updating everytime someone adds or removes a line.
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 
 fn main() {
     let _unimported = Blah { field: u8 };
diff --git a/tests/ui/track-diagnostics/track4.rs b/tests/ui/track-diagnostics/track4.rs
index 788c999e0527a..bc76f6f145171 100644
--- a/tests/ui/track-diagnostics/track4.rs
+++ b/tests/ui/track-diagnostics/track4.rs
@@ -3,7 +3,7 @@
 
 // Normalize the emitted location so this doesn't need
 // updating everytime someone adds or removes a line.
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 
 pub onion {
     Owo(u8),
diff --git a/tests/ui/track-diagnostics/track4.stderr b/tests/ui/track-diagnostics/track4.stderr
index d9eaea93638d1..19499fa7abc51 100644
--- a/tests/ui/track-diagnostics/track4.stderr
+++ b/tests/ui/track-diagnostics/track4.stderr
@@ -1,14 +1,14 @@
-error: missing `struct` for struct definition
+error: missing `enum` for enum definition
   --> $DIR/track4.rs:LL:CC
    |
 LL | pub onion {
-   |    ^
+   | ^^^^^^^^^
 -Ztrack-diagnostics: created at compiler/rustc_parse/src/parser/item.rs:LL:CC
    |
-help: add `struct` here to parse `onion` as a public struct
+help: add `enum` here to parse `onion` as an enum
    |
-LL | pub struct onion {
-   |     ++++++
+LL | pub enum onion {
+   |     ++++
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/track-diagnostics/track5.rs b/tests/ui/track-diagnostics/track5.rs
index 28df72915cfb8..bb82e9a62c8bd 100644
--- a/tests/ui/track-diagnostics/track5.rs
+++ b/tests/ui/track-diagnostics/track5.rs
@@ -3,6 +3,6 @@
 
 // Normalize the emitted location so this doesn't need
 // updating everytime someone adds or removes a line.
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 
 }
diff --git a/tests/ui/track-diagnostics/track6.rs b/tests/ui/track-diagnostics/track6.rs
index 7b0dd7a37a7a2..fc8df68e6d921 100644
--- a/tests/ui/track-diagnostics/track6.rs
+++ b/tests/ui/track-diagnostics/track6.rs
@@ -3,7 +3,7 @@
 
 // Normalize the emitted location so this doesn't need
 // updating everytime someone adds or removes a line.
-//@ normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+//@ normalize-stderr-test: ".rs:\d+:\d+" -> ".rs:LL:CC"
 
 
 pub trait Foo {
diff --git a/tests/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr b/tests/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr
index 38e692521ca23..03a4017b3d7fc 100644
--- a/tests/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr
+++ b/tests/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr
@@ -23,29 +23,29 @@ LL | struct Struct {}
    | ---------------- not a trait
 
 error: function not found in this trait
-  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:31
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:8:34
    |
 LL | #[rustc_must_implement_one_of(a, b)]
-   |                               ^
+   |                                  ^
+
+error: the `#[rustc_must_implement_one_of]` attribute must be used with at least 2 args
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:14:1
+   |
+LL | #[rustc_must_implement_one_of(a)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: function not found in this trait
-  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:34
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:31
    |
 LL | #[rustc_must_implement_one_of(a, b)]
-   |                                  ^
+   |                               ^
 
 error: function not found in this trait
-  --> $DIR/rustc_must_implement_one_of_misuse.rs:8:34
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:34
    |
 LL | #[rustc_must_implement_one_of(a, b)]
    |                                  ^
 
-error: the `#[rustc_must_implement_one_of]` attribute must be used with at least 2 args
-  --> $DIR/rustc_must_implement_one_of_misuse.rs:14:1
-   |
-LL | #[rustc_must_implement_one_of(a)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
 error: not a function
   --> $DIR/rustc_must_implement_one_of_misuse.rs:26:5
    |
diff --git a/tests/ui/traits/trait-upcasting/illegal-upcast-to-impl-opaque.rs b/tests/ui/traits/trait-upcasting/illegal-upcast-to-impl-opaque.rs
index 5820e49a4e52d..ef0a5a7adcaf5 100644
--- a/tests/ui/traits/trait-upcasting/illegal-upcast-to-impl-opaque.rs
+++ b/tests/ui/traits/trait-upcasting/illegal-upcast-to-impl-opaque.rs
@@ -2,10 +2,10 @@
 //@[next] compile-flags: -Znext-solver
 //@[next] failure-status: 101
 //@[next] known-bug: unknown
-//@[next] normalize-stderr-test "note: .*\n\n" -> ""
-//@[next] normalize-stderr-test "thread 'rustc' panicked.*\n.*\n" -> ""
-//@[next] normalize-stderr-test "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
-//@[next] normalize-stderr-test "delayed at .*" -> ""
+//@[next] normalize-stderr-test: "note: .*\n\n" -> ""
+//@[next] normalize-stderr-test: "thread 'rustc' panicked.*\n.*\n" -> ""
+//@[next] normalize-stderr-test: "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
+//@[next] normalize-stderr-test: "delayed at .*" -> ""
 //@[next] rustc-env:RUST_BACKTRACE=0
 //@ check-pass
 
diff --git a/tests/ui/traits/upcast_soundness_bug.rs b/tests/ui/traits/upcast_soundness_bug.rs
index 95b48cdf379e8..5eaa58f7efe7f 100644
--- a/tests/ui/traits/upcast_soundness_bug.rs
+++ b/tests/ui/traits/upcast_soundness_bug.rs
@@ -1,7 +1,8 @@
 #![feature(trait_upcasting)]
-//@ known-bug: #120222
-//@ check-pass
-//! This will segfault at runtime.
+//@ check-fail
+//
+// issue: <https://github.com/rust-lang/rust/pull/120222>
+//! This would segfault at runtime.
 
 pub trait SupSupA {
     fn method(&self) {}
@@ -56,6 +57,7 @@ pub fn user2() -> &'static dyn Trait<u8, u16> {
 fn main() {
     let p: *const dyn Trait<u8, u8> = &();
     let p = p as *const dyn Trait<u8, u16>; // <- this is bad!
+    //~^ error: mismatched types
     let p = p as *const dyn Super<u16>; // <- this upcast accesses improper vtable entry
     // accessing from L__unnamed_2 the position for the 'Super<u16> vtable (pointer)',
     // thus reading 'null pointer for missing_method'
diff --git a/tests/ui/traits/upcast_soundness_bug.stderr b/tests/ui/traits/upcast_soundness_bug.stderr
new file mode 100644
index 0000000000000..5864abcdb41f5
--- /dev/null
+++ b/tests/ui/traits/upcast_soundness_bug.stderr
@@ -0,0 +1,13 @@
+error[E0308]: mismatched types
+  --> $DIR/upcast_soundness_bug.rs:59:13
+   |
+LL |     let p = p as *const dyn Trait<u8, u16>; // <- this is bad!
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u8`, found `u16`
+   |
+   = note: expected trait object `dyn Trait<u8, u8>`
+              found trait object `dyn Trait<u8, u16>`
+   = help: `dyn Trait<u8, u16>` implements `Trait` so you could box the found value and coerce it to the trait object `Box<dyn Trait>`, you will have to change the expected type as well
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/transmute/transmute-different-sizes.rs b/tests/ui/transmute/transmute-different-sizes.rs
index ac98eb231dd1c..b7fca2b327831 100644
--- a/tests/ui/transmute/transmute-different-sizes.rs
+++ b/tests/ui/transmute/transmute-different-sizes.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "\d+ bits" -> "N bits"
+//@ normalize-stderr-test: "\d+ bits" -> "N bits"
 
 // Tests that `transmute` cannot be called on types of different size.
 
diff --git a/tests/ui/transmute/transmute-fat-pointers.rs b/tests/ui/transmute/transmute-fat-pointers.rs
index 7043e53dbff79..d1340c5e86045 100644
--- a/tests/ui/transmute/transmute-fat-pointers.rs
+++ b/tests/ui/transmute/transmute-fat-pointers.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "\d+ bits" -> "N bits"
+//@ normalize-stderr-test: "\d+ bits" -> "N bits"
 
 // Tests that are conservative around thin/fat pointer mismatches.
 
diff --git a/tests/ui/transmute/transmute-impl.rs b/tests/ui/transmute/transmute-impl.rs
index 617e707cda911..15d67483cc8d7 100644
--- a/tests/ui/transmute/transmute-impl.rs
+++ b/tests/ui/transmute/transmute-impl.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "\d+ bits" -> "N bits"
+//@ normalize-stderr-test: "\d+ bits" -> "N bits"
 
 // Tests that are conservative around thin/fat pointer mismatches.
 
diff --git a/tests/ui/treat-err-as-bug/err.rs b/tests/ui/treat-err-as-bug/err.rs
index 02eea06049490..82683cdffef69 100644
--- a/tests/ui/treat-err-as-bug/err.rs
+++ b/tests/ui/treat-err-as-bug/err.rs
@@ -2,8 +2,8 @@
 //@ failure-status: 101
 //@ error-pattern: aborting due to `-Z treat-err-as-bug=1`
 //@ error-pattern: [eval_static_initializer] evaluating initializer of static `C`
-//@ normalize-stderr-test "note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*:\n.*\n" -> ""
+//@ normalize-stderr-test: "note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*:\n.*\n" -> ""
 //@ rustc-env:RUST_BACKTRACE=0
 
 #![crate_type = "rlib"]
diff --git a/tests/ui/treat-err-as-bug/span_delayed_bug.rs b/tests/ui/treat-err-as-bug/span_delayed_bug.rs
index 7e5a221b6d85d..97b8e4a3ddac2 100644
--- a/tests/ui/treat-err-as-bug/span_delayed_bug.rs
+++ b/tests/ui/treat-err-as-bug/span_delayed_bug.rs
@@ -2,8 +2,8 @@
 //@ failure-status: 101
 //@ error-pattern: aborting due to `-Z treat-err-as-bug=1`
 //@ error-pattern: [trigger_delayed_bug] triggering a delayed bug for testing incremental
-//@ normalize-stderr-test "note: .*\n\n" -> ""
-//@ normalize-stderr-test "thread 'rustc' panicked.*:\n.*\n" -> ""
+//@ normalize-stderr-test: "note: .*\n\n" -> ""
+//@ normalize-stderr-test: "thread 'rustc' panicked.*:\n.*\n" -> ""
 //@ rustc-env:RUST_BACKTRACE=0
 
 #![feature(rustc_attrs)]
diff --git a/tests/ui/type/pattern_types/range_patterns.rs b/tests/ui/type/pattern_types/range_patterns.rs
index d1fd055dbab92..9eddc8cab7fe1 100644
--- a/tests/ui/type/pattern_types/range_patterns.rs
+++ b/tests/ui/type/pattern_types/range_patterns.rs
@@ -3,7 +3,7 @@
 #![feature(core_pattern_types)]
 #![allow(incomplete_features)]
 
-//@ normalize-stderr-test "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
+//@ normalize-stderr-test: "pref: Align\([1-8] bytes\)" -> "pref: $$SOME_ALIGN"
 
 use std::pat::pattern_type;
 
diff --git a/tests/ui/type/type-dependent-def-issue-49241.stderr b/tests/ui/type/type-dependent-def-issue-49241.stderr
index 15d47cca3d202..cf372dc59681e 100644
--- a/tests/ui/type/type-dependent-def-issue-49241.stderr
+++ b/tests/ui/type/type-dependent-def-issue-49241.stderr
@@ -2,9 +2,12 @@ error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/type-dependent-def-issue-49241.rs:3:22
    |
 LL |     const l: usize = v.count();
-   |     -------          ^ non-constant value
-   |     |
-   |     help: consider using `let` instead of `const`: `let l`
+   |                      ^ non-constant value
+   |
+help: consider using `let` instead of `const`
+   |
+LL |     let l: usize = v.count();
+   |     ~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/crashes/126744.rs b/tests/ui/typeck/struct-index-err-ice-issue-126744.rs
similarity index 56%
rename from tests/crashes/126744.rs
rename to tests/ui/typeck/struct-index-err-ice-issue-126744.rs
index ed562c86e61b2..00edc4d8e41e7 100644
--- a/tests/crashes/126744.rs
+++ b/tests/ui/typeck/struct-index-err-ice-issue-126744.rs
@@ -1,5 +1,4 @@
-//@ known-bug: rust-lang/rust#126744
-struct X {,}
+struct X {,} //~ ERROR expected identifier, found `,`
 
 fn main() {
     || {
diff --git a/tests/ui/typeck/struct-index-err-ice-issue-126744.stderr b/tests/ui/typeck/struct-index-err-ice-issue-126744.stderr
new file mode 100644
index 0000000000000..84a3af9ab0057
--- /dev/null
+++ b/tests/ui/typeck/struct-index-err-ice-issue-126744.stderr
@@ -0,0 +1,10 @@
+error: expected identifier, found `,`
+  --> $DIR/struct-index-err-ice-issue-126744.rs:1:11
+   |
+LL | struct X {,}
+   |        -  ^ expected identifier
+   |        |
+   |        while parsing this struct
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/typeof/issue-42060.stderr b/tests/ui/typeof/issue-42060.stderr
index effcbe4d7f3e8..86ba9432384b2 100644
--- a/tests/ui/typeof/issue-42060.stderr
+++ b/tests/ui/typeof/issue-42060.stderr
@@ -1,18 +1,24 @@
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-42060.rs:3:23
    |
-LL |     let thing = ();
-   |     --------- help: consider using `const` instead of `let`: `const thing`
 LL |     let other: typeof(thing) = thing;
    |                       ^^^^^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const thing: /* Type */ = ();
+   |     ~~~~~      ++++++++++++
 
 error[E0435]: attempt to use a non-constant value in a constant
   --> $DIR/issue-42060.rs:9:13
    |
-LL |     let q = 1;
-   |     ----- help: consider using `const` instead of `let`: `const q`
 LL |     <typeof(q)>::N
    |             ^ non-constant value
+   |
+help: consider using `const` instead of `let`
+   |
+LL |     const q: /* Type */ = 1;
+   |     ~~~~~  ++++++++++++
 
 error[E0516]: `typeof` is a reserved keyword but unimplemented
   --> $DIR/issue-42060.rs:3:16
diff --git a/tests/ui/unknown-llvm-arg.rs b/tests/ui/unknown-llvm-arg.rs
index 935c083dca657..17908d36417c7 100644
--- a/tests/ui/unknown-llvm-arg.rs
+++ b/tests/ui/unknown-llvm-arg.rs
@@ -1,6 +1,6 @@
 //@ compile-flags: -Cllvm-args=-not-a-real-llvm-arg
-//@ normalize-stderr-test "--help" -> "-help"
-//@ normalize-stderr-test "\n(\n|.)*" -> ""
+//@ normalize-stderr-test: "--help" -> "-help"
+//@ normalize-stderr-test: "\n(\n|.)*" -> ""
 
 // I'm seeing "--help" locally, but "-help" in CI, so I'm normalizing it to just "-help".
 
diff --git a/tests/ui/unpretty/avoid-crash.rs b/tests/ui/unpretty/avoid-crash.rs
index 2105068617b1c..e2bde8236220e 100644
--- a/tests/ui/unpretty/avoid-crash.rs
+++ b/tests/ui/unpretty/avoid-crash.rs
@@ -1,4 +1,4 @@
-//@ normalize-stderr-test "error `.*`" -> "$$ERROR_MESSAGE"
+//@ normalize-stderr-test: "error `.*`" -> "$$ERROR_MESSAGE"
 //@ compile-flags: -o. -Zunpretty=ast-tree
 
 fn main() {}
diff --git a/triagebot.toml b/triagebot.toml
index 746a663005277..77b3db8a0109b 100644
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -941,7 +941,6 @@ compiler = [
 libs = [
     "@cuviper",
     "@Mark-Simulacrum",
-    "@m-ou-se",
     "@Amanieu",
     "@Nilstrieb",
     "@workingjubilee",
@@ -1050,7 +1049,6 @@ project-const-traits = [
 project-stable-mir = [
     "@celinval",
     "@oli-obk",
-    "@spastorino",
     "@ouz-a",
 ]