Rollup of 6 pull requests

compiler/rustc_ast/src/mut_visit.rs

@@ -1625,9 +1625,10 @@ pub fn walk_expr<T: MutVisitor>(vis: &mut T, Expr { kind, id, span, attrs, token
             visit_thin_exprs(vis, call_args);
             vis.visit_span(span);
         }
-        ExprKind::Binary(_binop, lhs, rhs) => {
+        ExprKind::Binary(binop, lhs, rhs) => {
             vis.visit_expr(lhs);
             vis.visit_expr(rhs);
+            vis.visit_span(&mut binop.span);
         }
         ExprKind::Unary(_unop, ohs) => vis.visit_expr(ohs),
         ExprKind::Cast(expr, ty) => {
@@ -1785,20 +1786,21 @@ pub fn noop_filter_map_expr<T: MutVisitor>(vis: &mut T, mut e: P<Expr>) -> Optio
 
 pub fn walk_flat_map_stmt<T: MutVisitor>(
     vis: &mut T,
-    Stmt { kind, mut span, mut id }: Stmt,
+    Stmt { kind, span, mut id }: Stmt,
 ) -> SmallVec<[Stmt; 1]> {
     vis.visit_id(&mut id);
-    let stmts: SmallVec<_> = walk_flat_map_stmt_kind(vis, kind)
+    let mut stmts: SmallVec<[Stmt; 1]> = walk_flat_map_stmt_kind(vis, kind)
         .into_iter()
         .map(|kind| Stmt { id, kind, span })
         .collect();
-    if stmts.len() > 1 {
-        panic!(
+    match stmts.len() {
+        0 => {}
+        1 => vis.visit_span(&mut stmts[0].span),
+        2.. => panic!(
             "cloning statement `NodeId`s is prohibited by default, \
              the visitor should implement custom statement visiting"
-        );
+        ),
     }
-    vis.visit_span(&mut span);
     stmts
 }
 

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -973,25 +973,20 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         propagated_outlives_requirements: &mut Vec<ClosureOutlivesRequirement<'tcx>>,
     ) -> bool {
         let tcx = infcx.tcx;
-
-        let TypeTest { generic_kind, lower_bound, span: _, verify_bound: _ } = type_test;
+        let TypeTest { generic_kind, lower_bound, span: blame_span, ref verify_bound } = *type_test;
 
         let generic_ty = generic_kind.to_ty(tcx);
         let Some(subject) = self.try_promote_type_test_subject(infcx, generic_ty) else {
             return false;
         };
 
-        debug!("subject = {:?}", subject);
-
-        let r_scc = self.constraint_sccs.scc(*lower_bound);
-
+        let r_scc = self.constraint_sccs.scc(lower_bound);
         debug!(
             "lower_bound = {:?} r_scc={:?} universe={:?}",
             lower_bound,
             r_scc,
             self.constraint_sccs.annotation(r_scc).min_universe()
         );
-
         // If the type test requires that `T: 'a` where `'a` is a
         // placeholder from another universe, that effectively requires
         // `T: 'static`, so we have to propagate that requirement.
@@ -1004,7 +999,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             propagated_outlives_requirements.push(ClosureOutlivesRequirement {
                 subject,
                 outlived_free_region: static_r,
-                blame_span: type_test.span,
+                blame_span,
                 category: ConstraintCategory::Boring,
             });
 
@@ -1031,12 +1026,12 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             // where `ur` is a local bound -- we are sometimes in a
             // position to prove things that our caller cannot. See
             // #53570 for an example.
-            if self.eval_verify_bound(infcx, generic_ty, ur, &type_test.verify_bound) {
+            if self.eval_verify_bound(infcx, generic_ty, ur, &verify_bound) {
                 continue;
             }
 
             let non_local_ub = self.universal_region_relations.non_local_upper_bounds(ur);
-            debug!("try_promote_type_test: non_local_ub={:?}", non_local_ub);
+            debug!(?non_local_ub);
 
             // This is slightly too conservative. To show T: '1, given `'2: '1`
             // and `'3: '1` we only need to prove that T: '2 *or* T: '3, but to
@@ -1049,10 +1044,10 @@ impl<'tcx> RegionInferenceContext<'tcx> {
                 let requirement = ClosureOutlivesRequirement {
                     subject,
                     outlived_free_region: upper_bound,
-                    blame_span: type_test.span,
+                    blame_span,
                     category: ConstraintCategory::Boring,
                 };
-                debug!("try_promote_type_test: pushing {:#?}", requirement);
+                debug!(?requirement, "adding closure requirement");
                 propagated_outlives_requirements.push(requirement);
             }
         }
@@ -1063,44 +1058,14 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// variables in the type `T` with an equal universal region from the
     /// closure signature.
     /// This is not always possible, so this is a fallible process.
-    #[instrument(level = "debug", skip(self, infcx))]
+    #[instrument(level = "debug", skip(self, infcx), ret)]
     fn try_promote_type_test_subject(
         &self,
         infcx: &InferCtxt<'tcx>,
         ty: Ty<'tcx>,
     ) -> Option<ClosureOutlivesSubject<'tcx>> {
         let tcx = infcx.tcx;
-
-        // Opaque types' args may include useless lifetimes.
-        // We will replace them with ReStatic.
-        struct OpaqueFolder<'tcx> {
-            tcx: TyCtxt<'tcx>,
-        }
-        impl<'tcx> ty::TypeFolder<TyCtxt<'tcx>> for OpaqueFolder<'tcx> {
-            fn cx(&self) -> TyCtxt<'tcx> {
-                self.tcx
-            }
-            fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
-                use ty::TypeSuperFoldable as _;
-                let tcx = self.tcx;
-                let &ty::Alias(ty::Opaque, ty::AliasTy { args, def_id, .. }) = t.kind() else {
-                    return t.super_fold_with(self);
-                };
-                let args = std::iter::zip(args, tcx.variances_of(def_id)).map(|(arg, v)| {
-                    match (arg.unpack(), v) {
-                        (ty::GenericArgKind::Lifetime(_), ty::Bivariant) => {
-                            tcx.lifetimes.re_static.into()
-                        }
-                        _ => arg.fold_with(self),
-                    }
-                });
-                Ty::new_opaque(tcx, def_id, tcx.mk_args_from_iter(args))
-            }
-        }
-
-        let ty = ty.fold_with(&mut OpaqueFolder { tcx });
         let mut failed = false;
-
         let ty = fold_regions(tcx, ty, |r, _depth| {
             let r_vid = self.to_region_vid(r);
             let r_scc = self.constraint_sccs.scc(r_vid);

library/core/src/num/nonzero.rs

@@ -37,6 +37,8 @@ pub unsafe trait ZeroablePrimitive: Sized + Copy + private::Sealed {
 macro_rules! impl_zeroable_primitive {
     ($($NonZeroInner:ident ( $primitive:ty )),+ $(,)?) => {
         mod private {
+            use super::*;
+
             #[unstable(
                 feature = "nonzero_internals",
                 reason = "implementation detail which may disappear or be replaced at any time",
@@ -45,7 +47,11 @@ macro_rules! impl_zeroable_primitive {
             pub trait Sealed {}
 
             $(
-                #[derive(Debug, Clone, Copy, PartialEq)]
+                // This inner type is never shown directly, so intentionally does not have Debug
+                #[expect(missing_debug_implementations)]
+                // Since this struct is non-generic and derives Copy,
+                // the derived Clone is `*self` and thus doesn't field-project.
+                #[derive(Clone, Copy)]
                 #[repr(transparent)]
                 #[rustc_layout_scalar_valid_range_start(1)]
                 #[rustc_nonnull_optimization_guaranteed]
@@ -55,6 +61,16 @@ macro_rules! impl_zeroable_primitive {
                     issue = "none"
                 )]
                 pub struct $NonZeroInner($primitive);
+
+                // This is required to allow matching a constant.  We don't get it from a derive
+                // because the derived `PartialEq` would do a field projection, which is banned
+                // by <https://github.com/rust-lang/compiler-team/issues/807>.
+                #[unstable(
+                    feature = "nonzero_internals",
+                    reason = "implementation detail which may disappear or be replaced at any time",
+                    issue = "none"
+                )]
+                impl StructuralPartialEq for $NonZeroInner {}
             )+
         }
 
@@ -172,7 +188,7 @@ where
 {
     #[inline]
     fn clone(&self) -> Self {
-        Self(self.0)
+        *self
     }
 }
 
@@ -440,15 +456,21 @@ where
     #[rustc_const_stable(feature = "const_nonzero_get", since = "1.34.0")]
     #[inline]
     pub const fn get(self) -> T {
-        // FIXME: This can be changed to simply `self.0` once LLVM supports `!range` metadata
-        // for function arguments: https://github.com/llvm/llvm-project/issues/76628
-        //
         // Rustc can set range metadata only if it loads `self` from
         // memory somewhere. If the value of `self` was from by-value argument
         // of some not-inlined function, LLVM don't have range metadata
         // to understand that the value cannot be zero.
         //
-        // For now, using the transmute `assume`s the range at runtime.
+        // Using the transmute `assume`s the range at runtime.
+        //
+        // Even once LLVM supports `!range` metadata for function arguments
+        // (see <https://github.com/llvm/llvm-project/issues/76628>), this can't
+        // be `.0` because MCP#807 bans field-projecting into `scalar_valid_range`
+        // types, and it arguably wouldn't want to be anyway because if this is
+        // MIR-inlined, there's no opportunity to put that argument metadata anywhere.
+        //
+        // The good answer here will eventually be pattern types, which will hopefully
+        // allow it to go back to `.0`, maybe with a cast of some sort.
         //
         // SAFETY: `ZeroablePrimitive` guarantees that the size and bit validity
         // of `.0` is such that this transmute is sound.