Rollup of 8 pull requests

compiler/rustc_ast/src/util/parser.rs

@@ -225,7 +225,7 @@ impl AssocOp {
             AssignOp(_) | // `{ 42 } +=`
             As | // `{ 42 } as usize`
             // Equal | // `{ 42 } == { 42 }`    Accepting these here would regress incorrect
-            // NotEqual | // `{ 42 } != { 42 }  struct literals parser recovery.
+            // NotEqual | // `{ 42 } != { 42 }` struct literals parser recovery.
             Colon, // `{ 42 }: usize`
         )
     }

compiler/rustc_ast_lowering/src/lib.rs

@@ -1607,7 +1607,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         hir::OwnerNode::Item(self.arena.alloc(opaque_ty_item))
     }
 
-    /// Given a `parent_def_id`, a list of `lifetimes_in_bounds and a `remapping` hash to be
+    /// Given a `parent_def_id`, a list of `lifetimes_in_bounds` and a `remapping` hash to be
     /// filled, this function creates new definitions for `Param` and `Fresh` lifetimes, inserts the
     /// new definition, adds it to the remapping with the definition of the given lifetime and
     /// returns a list of lifetimes to be lowered afterwards.

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -192,7 +192,7 @@ impl<'a> AstValidator<'a> {
                 // We allow these:
                 //  - `Option<impl Trait>`
                 //  - `option::Option<impl Trait>`
-                //  - `option::Option<T>::Foo<impl Trait>
+                //  - `option::Option<T>::Foo<impl Trait>`
                 //
                 // But not these:
                 //  - `<impl Trait>::Foo`

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -415,7 +415,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
     /// fn foo<'a, 'b>(x: &'a u32) -> &'b u32 { x }
     /// ```
     ///
-    /// Here we would be invoked with `fr = 'a` and `outlived_fr = `'b`.
+    /// Here we would be invoked with `fr = 'a` and `outlived_fr = 'b`.
     pub(crate) fn report_region_error(
         &mut self,
         fr: RegionVid,
@@ -949,7 +949,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                     .push_span_label(*span, "this has an implicit `'static` lifetime requirement");
                 multi_span.push_span_label(
                     ident.span,
-                    "calling this method introduces the `impl`'s 'static` requirement",
+                    "calling this method introduces the `impl`'s `'static` requirement",
                 );
                 err.subdiagnostic(RequireStaticErr::UsedImpl { multi_span });
                 err.span_suggestion_verbose(

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -889,7 +889,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// from a universe it can't name; at present, the only way for
     /// this to be true is if `scc` outlives `'static`. This is
     /// actually stricter than necessary: ideally, we'd support bounds
-    /// like `for<'a: 'b`>` that might then allow us to approximate
+    /// like `for<'a: 'b>` that might then allow us to approximate
     /// `'a` with `'b` and not `'static`. But it will have to do for
     /// now.
     fn add_incompatible_universe(&mut self, scc: ConstraintSccIndex) {

compiler/rustc_borrowck/src/region_infer/values.rs

@@ -235,7 +235,7 @@ pub(crate) struct RegionValues<N: Idx> {
     free_regions: SparseBitMatrix<N, RegionVid>,
 
     /// Placeholders represent bound regions -- so something like `'a`
-    /// in for<'a> fn(&'a u32)`.
+    /// in `for<'a> fn(&'a u32)`.
     placeholders: SparseBitMatrix<N, PlaceholderIndex>,
 }
 

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -1814,8 +1814,6 @@ extern "C" {
     /// Creates a legacy pass manager -- only used for final codegen.
     pub fn LLVMCreatePassManager<'a>() -> &'a mut PassManager<'a>;
 
-    pub fn LLVMInitializePasses();
-
     pub fn LLVMTimeTraceProfilerInitialize();
 
     pub fn LLVMTimeTraceProfilerFinishThread();

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -120,8 +120,6 @@ unsafe fn configure_llvm(sess: &Session) {
         llvm::LLVMTimeTraceProfilerInitialize();
     }
 
-    llvm::LLVMInitializePasses();
-
     rustc_llvm::initialize_available_targets();
 
     llvm::LLVMRustSetLLVMOptions(llvm_args.len() as c_int, llvm_args.as_ptr());

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -457,7 +457,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 assert_eq!(input_len, dest_len, "Return vector length must match input length");
                 assert!(
                     index < dest_len,
-                    "Index `{}` must be in bounds of vector with length {}`",
+                    "Index `{}` must be in bounds of vector with length {}",
                     index,
                     dest_len
                 );
@@ -477,7 +477,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let (input, input_len) = self.operand_to_simd(&args[0])?;
                 assert!(
                     index < input_len,
-                    "index `{}` must be in bounds of vector with length `{}`",
+                    "index `{}` must be in bounds of vector with length {}",
                     index,
                     input_len
                 );

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -332,7 +332,7 @@ impl<'mir, 'tcx> Checker<'mir, 'tcx> {
 
     fn check_static(&mut self, def_id: DefId, span: Span) {
         if self.tcx.is_thread_local_static(def_id) {
-            self.tcx.sess.delay_span_bug(span, "tls access is checked in `Rvalue::ThreadLocalRef");
+            self.tcx.sess.delay_span_bug(span, "tls access is checked in `Rvalue::ThreadLocalRef`");
         }
         self.check_op_spanned(ops::StaticAccess, span)
     }

compiler/rustc_data_structures/src/stable_hasher/tests.rs

@@ -150,7 +150,7 @@ fn test_isize_compression() {
         let hash_b = hash(&(b as isize, a as isize));
         assert_ne!(
             hash_a, hash_b,
-            "The hash stayed the same when permuting values `{a}` and `{b}!",
+            "The hash stayed the same when permuting values `{a}` and `{b}`!",
         );
     }
 

compiler/rustc_expand/src/mbe/transcribe.rs

@@ -282,7 +282,7 @@ pub(super) fn transcribe<'a>(
             }
 
             // There should be no meta-var declarations in the invocation of a macro.
-            mbe::TokenTree::MetaVarDecl(..) => panic!("unexpected `TokenTree::MetaVarDecl"),
+            mbe::TokenTree::MetaVarDecl(..) => panic!("unexpected `TokenTree::MetaVarDecl`"),
         }
     }
 }

compiler/rustc_hir_analysis/locales/en-US.ftl

@@ -125,9 +125,14 @@ hir_analysis_where_clause_on_main = `main` function is not allowed to have a `wh
 hir_analysis_track_caller_on_main = `main` function is not allowed to be `#[track_caller]`
     .suggestion = remove this annotation
 
+hir_analysis_target_feature_on_main = `main` function is not allowed to have `#[target_feature]`
+
 hir_analysis_start_not_track_caller = `start` is not allowed to be `#[track_caller]`
     .label = `start` is not allowed to be `#[track_caller]`
 
+hir_analysis_start_not_target_feature = `start` is not allowed to have `#[target_feature]`
+    .label = `start` is not allowed to have `#[target_feature]`
+
 hir_analysis_start_not_async = `start` is not allowed to be `async`
     .label = `start` is not allowed to be `async`
 
@@ -147,3 +152,11 @@ hir_analysis_main_function_generic_parameters = `main` function is not allowed t
 
 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_cannot_capture_late_bound_ty_in_anon_const =
+    cannot capture late-bound type parameter in a constant
+    .label = parameter defined here
+
+hir_analysis_cannot_capture_late_bound_const_in_anon_const =
+    cannot capture late-bound const parameter in a constant
+    .label = parameter defined here

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -1873,7 +1873,7 @@ pub(super) fn check_type_bounds<'tcx>(
     //     type Bar<C> =...
     // }
     //
-    // - `impl_trait_ref` would be `<(A, B) as Foo<u32>>
+    // - `impl_trait_ref` would be `<(A, B) as Foo<u32>>`
     // - `impl_ty_substs` would be `[A, B, ^0.0]` (`^0.0` here is the bound var with db 0 and index 0)
     // - `rebased_substs` would be `[(A, B), u32, ^0.0]`, combining the substs from
     //    the *trait* with the generic associated type parameters (as bound vars).

compiler/rustc_hir_analysis/src/coherence/builtin.rs

@@ -437,7 +437,7 @@ pub fn coerce_unsized_info<'tcx>(tcx: TyCtxt<'tcx>, impl_did: DefId) -> CoerceUn
             }
 
             // Here we are considering a case of converting
-            // `S<P0...Pn>` to S<Q0...Qn>`. As an example, let's imagine a struct `Foo<T, U>`,
+            // `S<P0...Pn>` to `S<Q0...Qn>`. As an example, let's imagine a struct `Foo<T, U>`,
             // which acts like a pointer to `U`, but carries along some extra data of type `T`:
             //
             //     struct Foo<T, U> {

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -24,6 +24,8 @@ use rustc_span::symbol::{sym, Ident};
 use rustc_span::Span;
 use std::fmt;
 
+use crate::errors;
+
 trait RegionExt {
     fn early(param: &GenericParam<'_>) -> (LocalDefId, ResolvedArg);
 
@@ -161,6 +163,15 @@ enum Scope<'a> {
         s: ScopeRef<'a>,
     },
 
+    /// Disallows capturing non-lifetime binders from parent scopes.
+    ///
+    /// This is necessary for something like `for<T> [(); { /* references T */ }]:`,
+    /// since we don't do something more correct like replacing any captured
+    /// late-bound vars with early-bound params in the const's own generics.
+    AnonConstBoundary {
+        s: ScopeRef<'a>,
+    },
+
     Root {
         opt_parent_item: Option<LocalDefId>,
     },
@@ -211,6 +222,7 @@ impl<'a> fmt::Debug for TruncatedScopeDebug<'a> {
                 .field("s", &"..")
                 .finish(),
             Scope::TraitRefBoundary { s: _ } => f.debug_struct("TraitRefBoundary").finish(),
+            Scope::AnonConstBoundary { s: _ } => f.debug_struct("AnonConstBoundary").finish(),
             Scope::Root { opt_parent_item } => {
                 f.debug_struct("Root").field("opt_parent_item", &opt_parent_item).finish()
             }
@@ -312,7 +324,9 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
                     break (vec![], BinderScopeType::Normal);
                 }
 
-                Scope::Elision { s, .. } | Scope::ObjectLifetimeDefault { s, .. } => {
+                Scope::Elision { s, .. }
+                | Scope::ObjectLifetimeDefault { s, .. }
+                | Scope::AnonConstBoundary { s } => {
                     scope = s;
                 }
 
@@ -1029,6 +1043,12 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
     fn visit_poly_trait_ref(&mut self, trait_ref: &'tcx hir::PolyTraitRef<'tcx>) {
         self.visit_poly_trait_ref_inner(trait_ref, NonLifetimeBinderAllowed::Allow);
     }
+
+    fn visit_anon_const(&mut self, c: &'tcx hir::AnonConst) {
+        self.with(Scope::AnonConstBoundary { s: self.scope }, |this| {
+            intravisit::walk_anon_const(this, c);
+        });
+    }
 }
 
 fn object_lifetime_default(tcx: TyCtxt<'_>, param_def_id: DefId) -> ObjectLifetimeDefault {
@@ -1275,7 +1295,8 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
                 Scope::Elision { s, .. }
                 | Scope::ObjectLifetimeDefault { s, .. }
                 | Scope::Supertrait { s, .. }
-                | Scope::TraitRefBoundary { s, .. } => {
+                | Scope::TraitRefBoundary { s, .. }
+                | Scope::AnonConstBoundary { s } => {
                     scope = s;
                 }
             }
@@ -1340,7 +1361,8 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
                 | Scope::Elision { s, .. }
                 | Scope::ObjectLifetimeDefault { s, .. }
                 | Scope::Supertrait { s, .. }
-                | Scope::TraitRefBoundary { s, .. } => {
+                | Scope::TraitRefBoundary { s, .. }
+                | Scope::AnonConstBoundary { s } => {
                     scope = s;
                 }
             }
@@ -1359,6 +1381,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
         // search.
         let mut late_depth = 0;
         let mut scope = self.scope;
+        let mut crossed_anon_const = false;
         let result = loop {
             match *scope {
                 Scope::Body { s, .. } => {
@@ -1392,10 +1415,36 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
                 | Scope::TraitRefBoundary { s, .. } => {
                     scope = s;
                 }
+
+                Scope::AnonConstBoundary { s } => {
+                    crossed_anon_const = true;
+                    scope = s;
+                }
             }
         };
 
         if let Some(def) = result {
+            if let ResolvedArg::LateBound(..) = def && crossed_anon_const {
+                let use_span = self.tcx.hir().span(hir_id);
+                let def_span = self.tcx.def_span(param_def_id);
+                match self.tcx.def_kind(param_def_id) {
+                    DefKind::ConstParam => {
+                        self.tcx.sess.emit_err(errors::CannotCaptureLateBoundInAnonConst::Const {
+                            use_span,
+                            def_span,
+                        });
+                    }
+                    DefKind::TyParam => {
+                        self.tcx.sess.emit_err(errors::CannotCaptureLateBoundInAnonConst::Type {
+                            use_span,
+                            def_span,
+                        });
+                    }
+                    _ => unreachable!(),
+                }
+                return;
+            }
+
             self.map.defs.insert(hir_id, def);
             return;
         }
@@ -1474,7 +1523,8 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
                         | Scope::Elision { s, .. }
                         | Scope::ObjectLifetimeDefault { s, .. }
                         | Scope::Supertrait { s, .. }
-                        | Scope::TraitRefBoundary { s, .. } => {
+                        | Scope::TraitRefBoundary { s, .. }
+                        | Scope::AnonConstBoundary { s } => {
                             scope = s;
                         }
                     }
@@ -1710,7 +1760,9 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
 
                 Scope::ObjectLifetimeDefault { lifetime: Some(l), .. } => break l,
 
-                Scope::Supertrait { s, .. } | Scope::TraitRefBoundary { s, .. } => {
+                Scope::Supertrait { s, .. }
+                | Scope::TraitRefBoundary { s, .. }
+                | Scope::AnonConstBoundary { s } => {
                     scope = s;
                 }
             }

compiler/rustc_hir_analysis/src/errors.rs

@@ -315,6 +315,14 @@ pub(crate) struct TrackCallerOnMain {
     pub annotated: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(hir_analysis_target_feature_on_main)]
+pub(crate) struct TargetFeatureOnMain {
+    #[primary_span]
+    #[label(hir_analysis_target_feature_on_main)]
+    pub main: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(hir_analysis_start_not_track_caller)]
 pub(crate) struct StartTrackCaller {
@@ -324,6 +332,15 @@ pub(crate) struct StartTrackCaller {
     pub start: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(hir_analysis_start_not_target_feature)]
+pub(crate) struct StartTargetFeature {
+    #[primary_span]
+    pub span: Span,
+    #[label]
+    pub start: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(hir_analysis_start_not_async, code = "E0752")]
 pub(crate) struct StartAsync {
@@ -381,3 +398,21 @@ pub(crate) struct VariadicFunctionCompatibleConvention<'a> {
     pub span: Span,
     pub conventions: &'a str,
 }
+
+#[derive(Diagnostic)]
+pub(crate) enum CannotCaptureLateBoundInAnonConst {
+    #[diag(hir_analysis_cannot_capture_late_bound_ty_in_anon_const)]
+    Type {
+        #[primary_span]
+        use_span: Span,
+        #[label]
+        def_span: Span,
+    },
+    #[diag(hir_analysis_cannot_capture_late_bound_const_in_anon_const)]
+    Const {
+        #[primary_span]
+        use_span: Span,
+        #[label]
+        def_span: Span,
+    },
+}

compiler/rustc_hir_analysis/src/lib.rs

@@ -283,6 +283,11 @@ fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) {
         error = true;
     }
 
+    if !tcx.codegen_fn_attrs(main_def_id).target_features.is_empty() {
+        tcx.sess.emit_err(errors::TargetFeatureOnMain { main: main_span });
+        error = true;
+    }
+
     if error {
         return;
     }
@@ -373,6 +378,13 @@ fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: DefId) {
                             });
                             error = true;
                         }
+                        if attr.has_name(sym::target_feature) {
+                            tcx.sess.emit_err(errors::StartTargetFeature {
+                                span: attr.span,
+                                start: start_span,
+                            });
+                            error = true;
+                        }
                     }
 
                     if error {