Auto merge of rust-lang#119324 - compiler-errors:rollup-c6eqcg9, r=co…

…mpiler-errors

Rollup of 5 pull requests

Successful merges:

 - rust-lang#119235 (Add missing feature gate for sanitizer CFI cfgs)
 - rust-lang#119240 (Make some non-diagnostic-affecting `QPath::LangItem` into regular `QPath`s)
 - rust-lang#119297 (Pass DeadItem and lint as consistent group in dead-code.)
 - rust-lang#119307 (Clean up some lifetimes in `rustc_pattern_analysis`)
 - rust-lang#119323 (add test for coercing never to infinite type)

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

compiler/rustc_ast_lowering/src/expr.rs

@@ -638,7 +638,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             self.lower_span(span),
             Some(self.allow_gen_future.clone()),
         );
-        let resume_ty = hir::QPath::LangItem(hir::LangItem::ResumeTy, unstable_span);
+        let resume_ty = self.make_lang_item_qpath(hir::LangItem::ResumeTy, unstable_span);
         let input_ty = hir::Ty {
             hir_id: self.next_id(),
             kind: hir::TyKind::Path(resume_ty),
@@ -774,7 +774,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             self.lower_span(span),
             Some(self.allow_gen_future.clone()),
         );
-        let resume_ty = hir::QPath::LangItem(hir::LangItem::ResumeTy, unstable_span);
+        let resume_ty = self.make_lang_item_qpath(hir::LangItem::ResumeTy, unstable_span);
         let input_ty = hir::Ty {
             hir_id: self.next_id(),
             kind: hir::TyKind::Path(resume_ty),
@@ -2126,11 +2126,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
         lang_item: hir::LangItem,
         name: Symbol,
     ) -> hir::Expr<'hir> {
+        let qpath = self.make_lang_item_qpath(lang_item, self.lower_span(span));
         let path = hir::ExprKind::Path(hir::QPath::TypeRelative(
-            self.arena.alloc(self.ty(
-                span,
-                hir::TyKind::Path(hir::QPath::LangItem(lang_item, self.lower_span(span))),
-            )),
+            self.arena.alloc(self.ty(span, hir::TyKind::Path(qpath))),
             self.arena.alloc(hir::PathSegment::new(
                 Ident::new(name, span),
                 self.next_id(),

compiler/rustc_ast_lowering/src/lib.rs

@@ -772,6 +772,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         self.resolver.get_import_res(id).present_items()
     }
 
+    fn make_lang_item_qpath(&mut self, lang_item: hir::LangItem, span: Span) -> hir::QPath<'hir> {
+        hir::QPath::Resolved(None, self.make_lang_item_path(lang_item, span, None))
+    }
+
     fn make_lang_item_path(
         &mut self,
         lang_item: hir::LangItem,
@@ -789,7 +793,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 hir_id: self.next_id(),
                 res,
                 args,
-                infer_args: false,
+                infer_args: args.is_none(),
             }]),
         })
     }

compiler/rustc_feature/src/builtin_attrs.rs

@@ -36,6 +36,8 @@ const GATED_CFGS: &[GatedCfg] = &[
     (sym::sanitize, sym::cfg_sanitize, cfg_fn!(cfg_sanitize)),
     (sym::version, sym::cfg_version, cfg_fn!(cfg_version)),
     (sym::relocation_model, sym::cfg_relocation_model, cfg_fn!(cfg_relocation_model)),
+    (sym::sanitizer_cfi_generalize_pointers, sym::cfg_sanitizer_cfi, cfg_fn!(cfg_sanitizer_cfi)),
+    (sym::sanitizer_cfi_normalize_integers, sym::cfg_sanitizer_cfi, cfg_fn!(cfg_sanitizer_cfi)),
 ];
 
 /// Find a gated cfg determined by the `pred`icate which is given the cfg's name.

compiler/rustc_feature/src/unstable.rs

@@ -371,6 +371,8 @@ declare_features! (
     (unstable, cfg_relocation_model, "1.73.0", Some(114929)),
     /// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used.
     (unstable, cfg_sanitize, "1.41.0", Some(39699)),
+    /// Allows `cfg(sanitizer_cfi_generalize_pointers)` and `cfg(sanitizer_cfi_normalize_integers)`.
+    (unstable, cfg_sanitizer_cfi, "CURRENT_RUSTC_VERSION", Some(89653)),
     /// Allows `cfg(target_abi = "...")`.
     (unstable, cfg_target_abi, "1.55.0", Some(80970)),
     /// Allows `cfg(target(abi = "..."))`.

compiler/rustc_middle/src/thir/visit.rs

@@ -3,26 +3,26 @@ use super::{
     PatKind, Stmt, StmtKind, Thir,
 };
 
-pub trait Visitor<'a, 'tcx: 'a>: Sized {
-    fn thir(&self) -> &'a Thir<'tcx>;
+pub trait Visitor<'thir, 'tcx: 'thir>: Sized {
+    fn thir(&self) -> &'thir Thir<'tcx>;
 
-    fn visit_expr(&mut self, expr: &Expr<'tcx>) {
+    fn visit_expr(&mut self, expr: &'thir Expr<'tcx>) {
         walk_expr(self, expr);
     }
 
-    fn visit_stmt(&mut self, stmt: &Stmt<'tcx>) {
+    fn visit_stmt(&mut self, stmt: &'thir Stmt<'tcx>) {
         walk_stmt(self, stmt);
     }
 
-    fn visit_block(&mut self, block: &Block) {
+    fn visit_block(&mut self, block: &'thir Block) {
         walk_block(self, block);
     }
 
-    fn visit_arm(&mut self, arm: &Arm<'tcx>) {
+    fn visit_arm(&mut self, arm: &'thir Arm<'tcx>) {
         walk_arm(self, arm);
     }
 
-    fn visit_pat(&mut self, pat: &Pat<'tcx>) {
+    fn visit_pat(&mut self, pat: &'thir Pat<'tcx>) {
         walk_pat(self, pat);
     }
 
@@ -36,7 +36,10 @@ pub trait Visitor<'a, 'tcx: 'a>: Sized {
     // other `visit*` functions.
 }
 
-pub fn walk_expr<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, expr: &Expr<'tcx>) {
+pub fn walk_expr<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
+    visitor: &mut V,
+    expr: &'thir Expr<'tcx>,
+) {
     use ExprKind::*;
     match expr.kind {
         Scope { value, region_scope: _, lint_level: _ } => {
@@ -168,7 +171,10 @@ pub fn walk_expr<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, expr: &Exp
     }
 }
 
-pub fn walk_stmt<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, stmt: &Stmt<'tcx>) {
+pub fn walk_stmt<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
+    visitor: &mut V,
+    stmt: &'thir Stmt<'tcx>,
+) {
     match &stmt.kind {
         StmtKind::Expr { expr, scope: _ } => visitor.visit_expr(&visitor.thir()[*expr]),
         StmtKind::Let {
@@ -191,7 +197,10 @@ pub fn walk_stmt<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, stmt: &Stm
     }
 }
 
-pub fn walk_block<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, block: &Block) {
+pub fn walk_block<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
+    visitor: &mut V,
+    block: &'thir Block,
+) {
     for &stmt in &*block.stmts {
         visitor.visit_stmt(&visitor.thir()[stmt]);
     }
@@ -200,7 +209,10 @@ pub fn walk_block<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, block: &B
     }
 }
 
-pub fn walk_arm<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, arm: &Arm<'tcx>) {
+pub fn walk_arm<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
+    visitor: &mut V,
+    arm: &'thir Arm<'tcx>,
+) {
     match arm.guard {
         Some(Guard::If(expr)) => visitor.visit_expr(&visitor.thir()[expr]),
         Some(Guard::IfLet(ref pat, expr)) => {
@@ -213,7 +225,10 @@ pub fn walk_arm<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, arm: &Arm<'
     visitor.visit_expr(&visitor.thir()[arm.body]);
 }
 
-pub fn walk_pat<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, pat: &Pat<'tcx>) {
+pub fn walk_pat<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
+    visitor: &mut V,
+    pat: &'thir Pat<'tcx>,
+) {
     use PatKind::*;
     match &pat.kind {
         AscribeUserType { subpattern, ascription: _ }

compiler/rustc_mir_build/src/check_unsafety.rs

@@ -175,7 +175,7 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for LayoutConstrainedPlaceVisitor<'a, 'tcx> {
         self.thir
     }
 
-    fn visit_expr(&mut self, expr: &Expr<'tcx>) {
+    fn visit_expr(&mut self, expr: &'a Expr<'tcx>) {
         match expr.kind {
             ExprKind::Field { lhs, .. } => {
                 if let ty::Adt(adt_def, _) = self.thir[lhs].ty.kind() {
@@ -206,7 +206,7 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for UnsafetyVisitor<'a, 'tcx> {
         self.thir
     }
 
-    fn visit_block(&mut self, block: &Block) {
+    fn visit_block(&mut self, block: &'a Block) {
         match block.safety_mode {
             // compiler-generated unsafe code should not count towards the usefulness of
             // an outer unsafe block
@@ -234,7 +234,7 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for UnsafetyVisitor<'a, 'tcx> {
         }
     }
 
-    fn visit_pat(&mut self, pat: &Pat<'tcx>) {
+    fn visit_pat(&mut self, pat: &'a Pat<'tcx>) {
         if self.in_union_destructure {
             match pat.kind {
                 // binding to a variable allows getting stuff out of variable
@@ -319,7 +319,7 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for UnsafetyVisitor<'a, 'tcx> {
         }
     }
 
-    fn visit_expr(&mut self, expr: &Expr<'tcx>) {
+    fn visit_expr(&mut self, expr: &'a Expr<'tcx>) {
         // could we be in the LHS of an assignment to a field?
         match expr.kind {
             ExprKind::Field { .. }

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -75,11 +75,11 @@ enum LetSource {
     WhileLet,
 }
 
-struct MatchVisitor<'thir, 'p, 'tcx> {
+struct MatchVisitor<'p, 'tcx> {
     tcx: TyCtxt<'tcx>,
     param_env: ty::ParamEnv<'tcx>,
     typeck_results: &'tcx ty::TypeckResults<'tcx>,
-    thir: &'thir Thir<'tcx>,
+    thir: &'p Thir<'tcx>,
     lint_level: HirId,
     let_source: LetSource,
     pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>,
@@ -92,13 +92,13 @@ struct MatchVisitor<'thir, 'p, 'tcx> {
 
 // Visitor for a thir body. This calls `check_match`, `check_let` and `check_let_chain` as
 // appropriate.
-impl<'thir, 'tcx> Visitor<'thir, 'tcx> for MatchVisitor<'thir, '_, 'tcx> {
-    fn thir(&self) -> &'thir Thir<'tcx> {
+impl<'p, 'tcx> Visitor<'p, 'tcx> for MatchVisitor<'p, 'tcx> {
+    fn thir(&self) -> &'p Thir<'tcx> {
         self.thir
     }
 
     #[instrument(level = "trace", skip(self))]
-    fn visit_arm(&mut self, arm: &Arm<'tcx>) {
+    fn visit_arm(&mut self, arm: &'p Arm<'tcx>) {
         self.with_lint_level(arm.lint_level, |this| {
             match arm.guard {
                 Some(Guard::If(expr)) => {
@@ -121,7 +121,7 @@ impl<'thir, 'tcx> Visitor<'thir, 'tcx> for MatchVisitor<'thir, '_, 'tcx> {
     }
 
     #[instrument(level = "trace", skip(self))]
-    fn visit_expr(&mut self, ex: &Expr<'tcx>) {
+    fn visit_expr(&mut self, ex: &'p Expr<'tcx>) {
         match ex.kind {
             ExprKind::Scope { value, lint_level, .. } => {
                 self.with_lint_level(lint_level, |this| {
@@ -174,7 +174,7 @@ impl<'thir, 'tcx> Visitor<'thir, 'tcx> for MatchVisitor<'thir, '_, 'tcx> {
         self.with_let_source(LetSource::None, |this| visit::walk_expr(this, ex));
     }
 
-    fn visit_stmt(&mut self, stmt: &Stmt<'tcx>) {
+    fn visit_stmt(&mut self, stmt: &'p Stmt<'tcx>) {
         match stmt.kind {
             StmtKind::Let {
                 box ref pattern, initializer, else_block, lint_level, span, ..
@@ -195,7 +195,7 @@ impl<'thir, 'tcx> Visitor<'thir, 'tcx> for MatchVisitor<'thir, '_, 'tcx> {
     }
 }
 
-impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
+impl<'p, 'tcx> MatchVisitor<'p, 'tcx> {
     #[instrument(level = "trace", skip(self, f))]
     fn with_let_source(&mut self, let_source: LetSource, f: impl FnOnce(&mut Self)) {
         let old_let_source = self.let_source;
@@ -224,7 +224,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
     /// subexpressions we are not handling ourselves.
     fn visit_land(
         &mut self,
-        ex: &Expr<'tcx>,
+        ex: &'p Expr<'tcx>,
         accumulator: &mut Vec<Option<(Span, RefutableFlag)>>,
     ) -> Result<(), ErrorGuaranteed> {
         match ex.kind {
@@ -251,7 +251,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
     /// expression. This must call `visit_expr` on the subexpressions we are not handling ourselves.
     fn visit_land_rhs(
         &mut self,
-        ex: &Expr<'tcx>,
+        ex: &'p Expr<'tcx>,
     ) -> Result<Option<(Span, RefutableFlag)>, ErrorGuaranteed> {
         match ex.kind {
             ExprKind::Scope { value, lint_level, .. } => {
@@ -276,7 +276,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
     fn lower_pattern(
         &mut self,
         cx: &MatchCheckCtxt<'p, 'tcx>,
-        pat: &Pat<'tcx>,
+        pat: &'p Pat<'tcx>,
     ) -> Result<&'p DeconstructedPat<'p, 'tcx>, ErrorGuaranteed> {
         if let Err(err) = pat.pat_error_reported() {
             self.error = Err(err);
@@ -395,7 +395,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
     }
 
     #[instrument(level = "trace", skip(self))]
-    fn check_let(&mut self, pat: &Pat<'tcx>, scrutinee: Option<ExprId>, span: Span) {
+    fn check_let(&mut self, pat: &'p Pat<'tcx>, scrutinee: Option<ExprId>, span: Span) {
         assert!(self.let_source != LetSource::None);
         let scrut = scrutinee.map(|id| &self.thir[id]);
         if let LetSource::PlainLet = self.let_source {
@@ -547,7 +547,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
 
     fn analyze_binding(
         &mut self,
-        pat: &Pat<'tcx>,
+        pat: &'p Pat<'tcx>,
         refutability: RefutableFlag,
         scrut: Option<&Expr<'tcx>>,
     ) -> Result<(MatchCheckCtxt<'p, 'tcx>, UsefulnessReport<'p, 'tcx>), ErrorGuaranteed> {
@@ -560,7 +560,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
 
     fn is_let_irrefutable(
         &mut self,
-        pat: &Pat<'tcx>,
+        pat: &'p Pat<'tcx>,
         scrut: Option<&Expr<'tcx>>,
     ) -> Result<RefutableFlag, ErrorGuaranteed> {
         let (cx, report) = self.analyze_binding(pat, Refutable, scrut)?;
@@ -575,7 +575,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
     #[instrument(level = "trace", skip(self))]
     fn check_binding_is_irrefutable(
         &mut self,
-        pat: &Pat<'tcx>,
+        pat: &'p Pat<'tcx>,
         origin: &str,
         scrut: Option<&Expr<'tcx>>,
         sp: Option<Span>,
@@ -677,7 +677,7 @@ impl<'thir, 'p, 'tcx> MatchVisitor<'thir, 'p, 'tcx> {
 /// - `x @ Some(ref mut? y)`.
 ///
 /// This analysis is *not* subsumed by NLL.
-fn check_borrow_conflicts_in_at_patterns<'tcx>(cx: &MatchVisitor<'_, '_, 'tcx>, pat: &Pat<'tcx>) {
+fn check_borrow_conflicts_in_at_patterns<'tcx>(cx: &MatchVisitor<'_, 'tcx>, pat: &Pat<'tcx>) {
     // Extract `sub` in `binding @ sub`.
     let PatKind::Binding { name, mode, ty, subpattern: Some(box ref sub), .. } = pat.kind else {
         return;
@@ -772,7 +772,7 @@ fn check_borrow_conflicts_in_at_patterns<'tcx>(cx: &MatchVisitor<'_, '_, 'tcx>,
 }
 
 fn check_for_bindings_named_same_as_variants(
-    cx: &MatchVisitor<'_, '_, '_>,
+    cx: &MatchVisitor<'_, '_>,
     pat: &Pat<'_>,
     rf: RefutableFlag,
 ) {