Rollup of 10 pull requests

compiler/rustc_builtin_macros/src/errors.rs

@@ -136,27 +136,6 @@ pub(crate) struct BenchSig {
     pub(crate) span: Span,
 }
 
-#[derive(Diagnostic)]
-#[diag(builtin_macros_test_arg_non_lifetime)]
-pub(crate) struct TestArgNonLifetime {
-    #[primary_span]
-    pub(crate) span: Span,
-}
-
-#[derive(Diagnostic)]
-#[diag(builtin_macros_should_panic)]
-pub(crate) struct ShouldPanic {
-    #[primary_span]
-    pub(crate) span: Span,
-}
-
-#[derive(Diagnostic)]
-#[diag(builtin_macros_test_args)]
-pub(crate) struct TestArgs {
-    #[primary_span]
-    pub(crate) span: Span,
-}
-
 #[derive(Diagnostic)]
 #[diag(builtin_macros_alloc_must_statics)]
 pub(crate) struct AllocMustStatics {

compiler/rustc_errors/src/diagnostic.rs

@@ -108,6 +108,25 @@ impl EmissionGuarantee for rustc_span::fatal_error::FatalError {
 
 /// Trait implemented by error types. This is rarely implemented manually. Instead, use
 /// `#[derive(Diagnostic)]` -- see [rustc_macros::Diagnostic].
+///
+/// When implemented manually, it should be generic over the emission
+/// guarantee, i.e.:
+/// ```ignore (fragment)
+/// impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for Foo { ... }
+/// ```
+/// rather than being specific:
+/// ```ignore (fragment)
+/// impl<'a> IntoDiagnostic<'a> for Bar { ... }  // the default type param is `ErrorGuaranteed`
+/// impl<'a> IntoDiagnostic<'a, ()> for Baz { ... }
+/// ```
+/// There are two reasons for this.
+/// - A diagnostic like `Foo` *could* be emitted at any level -- `level` is
+///   passed in to `into_diagnostic` from outside. Even if in practice it is
+///   always emitted at a single level, we let the diagnostic creation/emission
+///   site determine the level (by using `create_err`, `emit_warn`, etc.)
+///   rather than the `IntoDiagnostic` impl.
+/// - Derived impls are always generic, and it's good for the hand-written
+///   impls to be consistent with them.
 #[rustc_diagnostic_item = "IntoDiagnostic"]
 pub trait IntoDiagnostic<'a, G: EmissionGuarantee = ErrorGuaranteed> {
     /// Write out as a diagnostic out of `DiagCtxt`.

compiler/rustc_errors/src/lib.rs

@@ -1498,14 +1498,26 @@ impl DiagCtxtInner {
         let bugs: Vec<_> =
             std::mem::take(&mut self.delayed_bugs).into_iter().map(|(b, _)| b).collect();
 
-        // If backtraces are enabled, also print the query stack
         let backtrace = std::env::var_os("RUST_BACKTRACE").map_or(true, |x| &x != "0");
-        for (i, bug) in bugs.into_iter().enumerate() {
-            if let Some(file) = self.ice_file.as_ref()
-                && let Ok(mut out) = std::fs::File::options().create(true).append(true).open(file)
-            {
-                let _ = write!(
-                    &mut out,
+        let decorate = backtrace || self.ice_file.is_none();
+        let mut out = self
+            .ice_file
+            .as_ref()
+            .and_then(|file| std::fs::File::options().create(true).append(true).open(file).ok());
+
+        // Put the overall explanation before the `DelayedBug`s, to frame them
+        // better (e.g. separate warnings from them). Also, use notes, which
+        // don't count as errors, to avoid possibly triggering
+        // `-Ztreat-err-as-bug`, which we don't want.
+        let note1 = "no errors encountered even though delayed bugs were created";
+        let note2 = "those delayed bugs will now be shown as internal compiler errors";
+        self.emit_diagnostic(DiagInner::new(Note, note1));
+        self.emit_diagnostic(DiagInner::new(Note, note2));
+
+        for bug in bugs {
+            if let Some(out) = &mut out {
+                _ = write!(
+                    out,
                     "delayed bug: {}\n{}\n",
                     bug.inner
                         .messages
@@ -1516,21 +1528,9 @@ impl DiagCtxtInner {
                 );
             }
 
-            if i == 0 {
-                // Put the overall explanation before the `DelayedBug`s, to
-                // frame them better (e.g. separate warnings from them). Also,
-                // make it a note so it doesn't count as an error, because that
-                // could trigger `-Ztreat-err-as-bug`, which we don't want.
-                let note1 = "no errors encountered even though delayed bugs were created";
-                let note2 = "those delayed bugs will now be shown as internal compiler errors";
-                self.emit_diagnostic(DiagInner::new(Note, note1));
-                self.emit_diagnostic(DiagInner::new(Note, note2));
-            }
-
-            let mut bug =
-                if backtrace || self.ice_file.is_none() { bug.decorate(self) } else { bug.inner };
+            let mut bug = if decorate { bug.decorate(self) } else { bug.inner };
 
-            // "Undelay" the delayed bugs (into plain `Bug`s).
+            // "Undelay" the delayed bugs into plain bugs.
             if bug.level != DelayedBug {
                 // NOTE(eddyb) not panicking here because we're already producing
                 // an ICE, and the more information the merrier.

compiler/rustc_feature/src/builtin_attrs.rs

@@ -555,56 +555,80 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     ),
     gated!(
         rustc_allow_const_fn_unstable, Normal,
-        template!(Word, List: "feat1, feat2, ..."), DuplicatesOk,
+        template!(Word, List: "feat1, feat2, ..."), DuplicatesOk, @only_local: true,
         "rustc_allow_const_fn_unstable side-steps feature gating and stability checks"
     ),
     gated!(
         allow_internal_unsafe, Normal, template!(Word), WarnFollowing,
-        "allow_internal_unsafe side-steps the unsafe_code lint",
+        @only_local: true, "allow_internal_unsafe side-steps the unsafe_code lint",
+    ),
+    rustc_attr!(
+        rustc_allowed_through_unstable_modules, Normal, template!(Word),
+        WarnFollowing, @only_local: true,
+        "rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \
+        through unstable paths"
     ),
-    rustc_attr!(rustc_allowed_through_unstable_modules, Normal, template!(Word), WarnFollowing,
-    "rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \
-    through unstable paths"),
 
     // ==========================================================================
     // Internal attributes: Type system related:
     // ==========================================================================
 
     gated!(fundamental, Normal, template!(Word), WarnFollowing, experimental!(fundamental)),
     gated!(
-        may_dangle, Normal, template!(Word), WarnFollowing, dropck_eyepatch,
+        may_dangle, Normal, template!(Word), WarnFollowing,
+        @only_local: true, dropck_eyepatch,
         "`may_dangle` has unstable semantics and may be removed in the future",
     ),
 
     // ==========================================================================
     // Internal attributes: Runtime related:
     // ==========================================================================
 
-    rustc_attr!(rustc_allocator, Normal, template!(Word), WarnFollowing, IMPL_DETAIL),
-    rustc_attr!(rustc_nounwind, Normal, template!(Word), WarnFollowing, IMPL_DETAIL),
-    rustc_attr!(rustc_reallocator, Normal, template!(Word), WarnFollowing, IMPL_DETAIL),
-    rustc_attr!(rustc_deallocator, Normal, template!(Word), WarnFollowing, IMPL_DETAIL),
-    rustc_attr!(rustc_allocator_zeroed, Normal, template!(Word), WarnFollowing, IMPL_DETAIL),
+    rustc_attr!(
+        rustc_allocator, Normal, template!(Word), WarnFollowing,
+        @only_local: true, IMPL_DETAIL
+    ),
+    rustc_attr!(
+        rustc_nounwind, Normal, template!(Word), WarnFollowing,
+        @only_local: true, IMPL_DETAIL
+    ),
+    rustc_attr!(
+        rustc_reallocator, Normal, template!(Word), WarnFollowing,
+        @only_local: true, IMPL_DETAIL
+    ),
+    rustc_attr!(
+        rustc_deallocator, Normal, template!(Word), WarnFollowing,
+        @only_local: true, IMPL_DETAIL
+    ),
+    rustc_attr!(
+        rustc_allocator_zeroed, Normal, template!(Word), WarnFollowing,
+        @only_local: true, IMPL_DETAIL
+    ),
+    gated!(
+        default_lib_allocator, Normal, template!(Word), WarnFollowing,
+        @only_local: true, allocator_internals, experimental!(default_lib_allocator),
+    ),
     gated!(
-        default_lib_allocator, Normal, template!(Word), WarnFollowing, allocator_internals,
-        experimental!(default_lib_allocator),
+        needs_allocator, Normal, template!(Word), WarnFollowing,
+        @only_local: true, allocator_internals, experimental!(needs_allocator),
     ),
     gated!(
-        needs_allocator, Normal, template!(Word), WarnFollowing, allocator_internals,
-        experimental!(needs_allocator),
+        panic_runtime, Normal, template!(Word), WarnFollowing,
+        @only_local: true, experimental!(panic_runtime)
     ),
-    gated!(panic_runtime, Normal, template!(Word), WarnFollowing, experimental!(panic_runtime)),
     gated!(
         needs_panic_runtime, Normal, template!(Word), WarnFollowing,
-        experimental!(needs_panic_runtime)
+        @only_local: true, experimental!(needs_panic_runtime)
     ),
     gated!(
         compiler_builtins, Normal, template!(Word), WarnFollowing,
+        @only_local: true,
         "the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate \
         which contains compiler-rt intrinsics and will never be stable",
     ),
     gated!(
         profiler_runtime, Normal, template!(Word), WarnFollowing,
+        @only_local: true,
         "the `#[profiler_runtime]` attribute is used to identify the `profiler_builtins` crate \
         which contains the profiler runtime and will never be stable",
     ),
@@ -630,7 +654,10 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         template!(Word, List: "name, /*opt*/ attributes(name1, name2, ...)"), ErrorFollowing,
         IMPL_DETAIL,
     ),
-    rustc_attr!(rustc_proc_macro_decls, Normal, template!(Word), WarnFollowing, INTERNAL_UNSTABLE),
+    rustc_attr!(
+        rustc_proc_macro_decls, Normal, template!(Word), WarnFollowing,
+        @only_local: true, INTERNAL_UNSTABLE
+    ),
     rustc_attr!(
         rustc_macro_transparency, Normal,
         template!(NameValueStr: "transparent|semitransparent|opaque"), ErrorFollowing,

compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs

@@ -136,11 +136,15 @@ pub(super) fn check_refining_return_position_impl_trait_in_trait<'tcx>(
     // 1. Project the RPITIT projections from the trait to the opaques on the impl,
     //    which means that they don't need to be mapped manually.
     //
-    // 2. Project any other projections that show up in the bound. That makes sure that
-    //    we don't consider `tests/ui/async-await/in-trait/async-associated-types.rs`
-    //    to be refining.
-    let (trait_bounds, impl_bounds) =
-        ocx.normalize(&ObligationCause::dummy(), param_env, (trait_bounds, impl_bounds));
+    // 2. Deeply normalize any other projections that show up in the bound. That makes sure
+    //    that we don't consider `tests/ui/async-await/in-trait/async-associated-types.rs`
+    //    or `tests/ui/impl-trait/in-trait/refine-normalize.rs` to be refining.
+    let Ok((trait_bounds, impl_bounds)) =
+        ocx.deeply_normalize(&ObligationCause::dummy(), param_env, (trait_bounds, impl_bounds))
+    else {
+        tcx.dcx().delayed_bug("encountered errors when checking RPITIT refinement (selection)");
+        return;
+    };
 
     // Since we've normalized things, we need to resolve regions, since we'll
     // possibly have introduced region vars during projection. We don't expect

compiler/rustc_hir_analysis/src/errors.rs

@@ -1004,13 +1004,6 @@ pub(crate) struct StaticSpecialize {
     pub span: Span,
 }
 
-#[derive(Diagnostic)]
-#[diag(hir_analysis_missing_tilde_const)]
-pub(crate) struct MissingTildeConst {
-    #[primary_span]
-    pub span: Span,
-}
-
 #[derive(Diagnostic)]
 pub(crate) enum DropImplPolarity {
     #[diag(hir_analysis_drop_impl_negative)]

compiler/rustc_parse/src/errors.rs

@@ -557,14 +557,6 @@ pub(crate) struct CatchAfterTry {
     pub span: Span,
 }
 
-#[derive(Diagnostic)]
-#[diag(parse_gen_fn)]
-#[help]
-pub(crate) struct GenFn {
-    #[primary_span]
-    pub span: Span,
-}
-
 #[derive(Diagnostic)]
 #[diag(parse_comma_after_base_struct)]
 #[note]

compiler/rustc_passes/messages.ftl

@@ -187,7 +187,7 @@ passes_doc_attr_not_crate_level =
     `#![doc({$attr_name} = "...")]` isn't allowed as a crate-level attribute
 
 passes_doc_cfg_hide_takes_list =
-    `#[doc(cfg_hide(...)]` takes a list of attributes
+    `#[doc(cfg_hide(...))]` takes a list of attributes
 
 passes_doc_expect_str =
     doc {$attr_name} attribute expects a string: #[doc({$attr_name} = "a")]

compiler/rustc_resolve/src/errors.rs

@@ -7,32 +7,6 @@ use rustc_span::{
 
 use crate::{late::PatternSource, Res};
 
-#[derive(Diagnostic)]
-#[diag(resolve_parent_module_reset_for_binding, code = E0637)]
-pub(crate) struct ParentModuleResetForBinding;
-
-#[derive(Diagnostic)]
-#[diag(resolve_ampersand_used_without_explicit_lifetime_name, code = E0637)]
-#[note]
-pub(crate) struct AmpersandUsedWithoutExplicitLifetimeName(#[primary_span] pub(crate) Span);
-
-#[derive(Diagnostic)]
-#[diag(resolve_underscore_lifetime_name_cannot_be_used_here, code = E0637)]
-#[note]
-pub(crate) struct UnderscoreLifetimeNameCannotBeUsedHere(#[primary_span] pub(crate) Span);
-
-#[derive(Diagnostic)]
-#[diag(resolve_crate_may_not_be_imported)]
-pub(crate) struct CrateMayNotBeImported(#[primary_span] pub(crate) Span);
-
-#[derive(Diagnostic)]
-#[diag(resolve_crate_root_imports_must_be_named_explicitly)]
-pub(crate) struct CrateRootNamesMustBeNamedExplicitly(#[primary_span] pub(crate) Span);
-
-#[derive(Diagnostic)]
-#[diag(resolve_crate_root_imports_must_be_named_explicitly)]
-pub(crate) struct ResolutionError(#[primary_span] pub(crate) Span);
-
 #[derive(Diagnostic)]
 #[diag(resolve_generic_params_from_outer_item, code = E0401)]
 pub(crate) struct GenericParamsFromOuterItem {
@@ -467,19 +441,6 @@ pub(crate) struct UnreachableLabelSubLabelUnreachable {
     pub(crate) ident_span: Span,
 }
 
-#[derive(Diagnostic)]
-#[diag(resolve_trait_impl_mismatch)]
-pub(crate) struct TraitImplMismatch {
-    #[primary_span]
-    #[label]
-    pub(crate) span: Span,
-    pub(crate) name: Symbol,
-    pub(crate) kind: String,
-    #[label(resolve_label_trait_item)]
-    pub(crate) trait_item_span: Span,
-    pub(crate) trait_path: String,
-}
-
 #[derive(Diagnostic)]
 #[diag(resolve_invalid_asm_sym)]
 #[help]

compiler/rustc_trait_selection/src/traits/engine.rs

@@ -107,6 +107,15 @@ impl<'a, 'tcx> ObligationCtxt<'a, 'tcx> {
         self.register_infer_ok_obligations(infer_ok)
     }
 
+    pub fn deeply_normalize<T: TypeFoldable<TyCtxt<'tcx>>>(
+        &self,
+        cause: &ObligationCause<'tcx>,
+        param_env: ty::ParamEnv<'tcx>,
+        value: T,
+    ) -> Result<T, Vec<FulfillmentError<'tcx>>> {
+        self.infcx.at(cause, param_env).deeply_normalize(value, &mut **self.engine.borrow_mut())
+    }
+
     /// Makes `expected <: actual`.
     pub fn eq_exp<T>(
         &self,

library/alloc/src/lib.rs

@@ -152,6 +152,7 @@
 #![feature(set_ptr_value)]
 #![feature(sized_type_properties)]
 #![feature(slice_from_ptr_range)]
+#![feature(slice_index_methods)]
 #![feature(slice_ptr_get)]
 #![feature(slice_ptr_len)]
 #![feature(slice_range)]