Auto merge of rust-lang#126760 - matthiaskrgr:rollup-w6ajurr, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#125627 (migration lint for `expr2024` for the edition 2024)
 - rust-lang#126481 (Add `powerpc-unknown-openbsd` maintaince status)
 - rust-lang#126613 (Print the tested value in int_log tests)
 - rust-lang#126617 (Expand `avx512_target_feature` to include VEX variants)
 - rust-lang#126686 (Add `#[rustc_dump_{predicates,item_bounds}]`)
 - rust-lang#126700 (Make edition dependent `:expr` macro fragment act like the edition-dependent `:pat` fragment does)
 - rust-lang#126707 (Pass target to inaccessible-temp-dir rmake test)
 - rust-lang#126757 (Properly gate `safe` keyword in pre-expansion)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_ast/src/token.rs

@@ -900,7 +900,11 @@ pub enum NonterminalKind {
     PatWithOr,
     Expr,
     /// Matches an expression using the rules from edition 2021 and earlier.
-    Expr2021,
+    Expr2021 {
+        /// Keep track of whether the user used `:expr` or `:expr_2021` and we inferred it from the
+        /// edition of the span. This is used for diagnostics AND feature gating.
+        inferred: bool,
+    },
     Ty,
     Ident,
     Lifetime,
@@ -929,8 +933,13 @@ impl NonterminalKind {
                 Edition::Edition2021 | Edition::Edition2024 => NonterminalKind::PatWithOr,
             },
             sym::pat_param => NonterminalKind::PatParam { inferred: false },
-            sym::expr => NonterminalKind::Expr,
-            sym::expr_2021 if edition().at_least_rust_2021() => NonterminalKind::Expr2021,
+            sym::expr => match edition() {
+                Edition::Edition2015 | Edition::Edition2018 | Edition::Edition2021 => {
+                    NonterminalKind::Expr2021 { inferred: true }
+                }
+                Edition::Edition2024 => NonterminalKind::Expr,
+            },
+            sym::expr_2021 => NonterminalKind::Expr2021 { inferred: false },
             sym::ty => NonterminalKind::Ty,
             sym::ident => NonterminalKind::Ident,
             sym::lifetime => NonterminalKind::Lifetime,
@@ -949,8 +958,8 @@ impl NonterminalKind {
             NonterminalKind::Stmt => sym::stmt,
             NonterminalKind::PatParam { inferred: false } => sym::pat_param,
             NonterminalKind::PatParam { inferred: true } | NonterminalKind::PatWithOr => sym::pat,
-            NonterminalKind::Expr => sym::expr,
-            NonterminalKind::Expr2021 => sym::expr_2021,
+            NonterminalKind::Expr | NonterminalKind::Expr2021 { inferred: true } => sym::expr,
+            NonterminalKind::Expr2021 { inferred: false } => sym::expr_2021,
             NonterminalKind::Ty => sym::ty,
             NonterminalKind::Ident => sym::ident,
             NonterminalKind::Lifetime => sym::lifetime,

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -562,6 +562,10 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
     gate_all!(precise_capturing, "precise captures on `impl Trait` are experimental");
     gate_all!(global_registration, "global registration is experimental");
     gate_all!(unsafe_attributes, "`#[unsafe()]` markers for attributes are experimental");
+    gate_all!(
+        unsafe_extern_blocks,
+        "`unsafe extern {}` blocks and `safe` keyword are experimental"
+    );
 
     if !visitor.features.never_patterns {
         if let Some(spans) = spans.get(&sym::never_patterns) {

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -1292,7 +1292,9 @@ fn is_in_follow(tok: &mbe::TokenTree, kind: NonterminalKind) -> IsInFollow {
                 // maintain
                 IsInFollow::Yes
             }
-            NonterminalKind::Stmt | NonterminalKind::Expr | NonterminalKind::Expr2021 => {
+            NonterminalKind::Stmt
+            | NonterminalKind::Expr
+            | NonterminalKind::Expr2021 { inferred: _ } => {
                 const TOKENS: &[&str] = &["`=>`", "`,`", "`;`"];
                 match tok {
                     TokenTree::Token(token) => match token.kind {

compiler/rustc_expand/src/mbe/quoted.rs

@@ -113,7 +113,8 @@ pub(super) fn parse(
                                                 );
                                                 token::NonterminalKind::Ident
                                             });
-                                    if kind == token::NonterminalKind::Expr2021
+                                    if kind
+                                        == (token::NonterminalKind::Expr2021 { inferred: false })
                                         && !features.expr_fragment_specifier_2024
                                     {
                                         rustc_session::parse::feature_err(

compiler/rustc_feature/src/builtin_attrs.rs

@@ -1088,6 +1088,14 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         ErrorFollowing, EncodeCrossCrate::No,
         "the `#[custom_mir]` attribute is just used for the Rust test suite",
     ),
+    rustc_attr!(
+        TEST, rustc_dump_item_bounds, Normal, template!(Word),
+        WarnFollowing, EncodeCrossCrate::No
+    ),
+    rustc_attr!(
+        TEST, rustc_dump_predicates, Normal, template!(Word),
+        WarnFollowing, EncodeCrossCrate::No
+    ),
     rustc_attr!(
         TEST, rustc_object_lifetime_default, Normal, template!(Word),
         WarnFollowing, EncodeCrossCrate::No

compiler/rustc_hir_analysis/messages.ftl

@@ -510,7 +510,7 @@ hir_analysis_ty_param_some = type parameter `{$param}` must be used as the type
     .note = implementing a foreign trait is only possible if at least one of the types for which it is implemented is local
     .only_note = only traits defined in the current crate can be implemented for a type parameter
 
-hir_analysis_type_of = {$type_of}
+hir_analysis_type_of = {$ty}
 
 hir_analysis_typeof_reserved_keyword_used =
     `typeof` is a reserved keyword but unimplemented
@@ -566,7 +566,7 @@ hir_analysis_value_of_associated_struct_already_specified =
 hir_analysis_variadic_function_compatible_convention = C-variadic function must have a compatible calling convention, like {$conventions}
     .label = C-variadic function must have a compatible calling convention
 
-hir_analysis_variances_of = {$variances_of}
+hir_analysis_variances_of = {$variances}
 
 hir_analysis_where_clause_on_main = `main` function is not allowed to have a `where` clause
     .label = `main` cannot have a `where` clause

compiler/rustc_hir_analysis/src/collect.rs

@@ -45,8 +45,8 @@ use std::ops::Bound;
 use crate::check::intrinsic::intrinsic_operation_unsafety;
 use crate::errors;
 use crate::hir_ty_lowering::{HirTyLowerer, RegionInferReason};
-pub use type_of::test_opaque_hidden_types;
 
+pub(crate) mod dump;
 mod generics_of;
 mod item_bounds;
 mod predicates_of;

compiler/rustc_hir_analysis/src/collect/dump.rs

@@ -0,0 +1,43 @@
+use rustc_hir::def::DefKind;
+use rustc_hir::def_id::CRATE_DEF_ID;
+use rustc_middle::ty::TyCtxt;
+use rustc_span::sym;
+
+pub(crate) fn opaque_hidden_types(tcx: TyCtxt<'_>) {
+    if !tcx.has_attr(CRATE_DEF_ID, sym::rustc_hidden_type_of_opaques) {
+        return;
+    }
+
+    for id in tcx.hir().items() {
+        let DefKind::OpaqueTy = tcx.def_kind(id.owner_id) else { continue };
+
+        let ty = tcx.type_of(id.owner_id).instantiate_identity();
+
+        tcx.dcx().emit_err(crate::errors::TypeOf { span: tcx.def_span(id.owner_id), ty });
+    }
+}
+
+pub(crate) fn predicates_and_item_bounds(tcx: TyCtxt<'_>) {
+    for id in tcx.hir_crate_items(()).owners() {
+        if tcx.has_attr(id, sym::rustc_dump_predicates) {
+            let preds = tcx.predicates_of(id).instantiate_identity(tcx).predicates;
+            let span = tcx.def_span(id);
+
+            let mut diag = tcx.dcx().struct_span_err(span, sym::rustc_dump_predicates.as_str());
+            for pred in preds {
+                diag.note(format!("{pred:?}"));
+            }
+            diag.emit();
+        }
+        if tcx.has_attr(id, sym::rustc_dump_item_bounds) {
+            let bounds = tcx.item_bounds(id).instantiate_identity();
+            let span = tcx.def_span(id);
+
+            let mut diag = tcx.dcx().struct_span_err(span, sym::rustc_dump_item_bounds.as_str());
+            for bound in bounds {
+                diag.note(format!("{bound:?}"));
+            }
+            diag.emit();
+        }
+    }
+}

compiler/rustc_hir_analysis/src/collect/type_of.rs

@@ -15,7 +15,6 @@ use crate::errors::TypeofReservedKeywordUsed;
 
 use super::bad_placeholder;
 use super::ItemCtxt;
-pub use opaque::test_opaque_hidden_types;
 
 mod opaque;
 

compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs

@@ -1,28 +1,14 @@
 use rustc_errors::StashKey;
 use rustc_hir::def::DefKind;
-use rustc_hir::def_id::{LocalDefId, CRATE_DEF_ID};
+use rustc_hir::def_id::LocalDefId;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{self as hir, def, Expr, ImplItem, Item, Node, TraitItem};
 use rustc_middle::bug;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
-use rustc_span::{sym, ErrorGuaranteed, DUMMY_SP};
+use rustc_span::DUMMY_SP;
 
-use crate::errors::{TaitForwardCompat, TaitForwardCompat2, TypeOf, UnconstrainedOpaqueType};
-
-pub fn test_opaque_hidden_types(tcx: TyCtxt<'_>) -> Result<(), ErrorGuaranteed> {
-    let mut res = Ok(());
-    if tcx.has_attr(CRATE_DEF_ID, sym::rustc_hidden_type_of_opaques) {
-        for id in tcx.hir().items() {
-            if matches!(tcx.def_kind(id.owner_id), DefKind::OpaqueTy) {
-                let type_of = tcx.type_of(id.owner_id).instantiate_identity();
-
-                res = Err(tcx.dcx().emit_err(TypeOf { span: tcx.def_span(id.owner_id), type_of }));
-            }
-        }
-    }
-    res
-}
+use crate::errors::{TaitForwardCompat, TaitForwardCompat2, UnconstrainedOpaqueType};
 
 /// Checks "defining uses" of opaque `impl Trait` in associated types.
 /// These can only be defined by associated items of the same trait.