Auto merge of #82430 - Dylan-DPC:rollup-nu4kfyc, r=Dylan-DPC

Rollup of 12 pull requests

Successful merges:

 - #79423 (Enable smart punctuation)
 - #81154 (Improve design of `assert_len`)
 - #81235 (Improve suggestion for tuple struct pattern matching errors.)
 - #81769 (Suggest `return`ing tail expressions that match return type)
 - #81837 (Slight perf improvement on char::to_ascii_lowercase)
 - #81969 (Avoid `cfg_if` in `std::os`)
 - #81984 (Make WASI's `hard_link` behavior match other platforms.)
 - #82091 (use PlaceRef abstractions more consistently)
 - #82128 (add diagnostic items for OsString/PathBuf/Owned as well as to_vec on slice)
 - #82166 (add s390x-unknown-linux-musl target)
 - #82234 (Remove query parameters when skipping search results)
 - #82255 (Make `treat_err_as_bug` Option<NonZeroUsize>)

Failed merges:

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

3 files changed, 14 insertions, 14 deletions

diff --git a/compiler/rustc_mir/src/dataflow/impls/liveness.rs b/compiler/rustc_mir/src/dataflow/impls/liveness.rs
index 85aaff5ab72..2d20f0d9547 100644
--- a/compiler/rustc_mir/src/dataflow/impls/liveness.rs
+++ b/compiler/rustc_mir/src/dataflow/impls/liveness.rs
@@ -95,7 +95,7 @@ where
 
         // We purposefully do not call `super_place` here to avoid calling `visit_local` for this
         // place with one of the `Projection` variants of `PlaceContext`.
-        self.visit_projection(local, projection, context, location);
+        self.visit_projection(place.as_ref(), context, location);
 
         match DefUse::for_place(context) {
             // Treat derefs as a use of the base local. `*p = 4` is not a def of `p` but a use.
diff --git a/compiler/rustc_mir/src/transform/check_consts/validation.rs b/compiler/rustc_mir/src/transform/check_consts/validation.rs
index 4973450ca83..a8263683712 100644
--- a/compiler/rustc_mir/src/transform/check_consts/validation.rs
+++ b/compiler/rustc_mir/src/transform/check_consts/validation.rs
@@ -515,7 +515,7 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
         // Special-case reborrows to be more like a copy of a reference.
         match *rvalue {
             Rvalue::Ref(_, kind, place) => {
-                if let Some(reborrowed_proj) = place_as_reborrow(self.tcx, self.body, place) {
+                if let Some(reborrowed_place_ref) = place_as_reborrow(self.tcx, self.body, place) {
                     let ctx = match kind {
                         BorrowKind::Shared => {
                             PlaceContext::NonMutatingUse(NonMutatingUseContext::SharedBorrow)
@@ -530,21 +530,21 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
                             PlaceContext::MutatingUse(MutatingUseContext::Borrow)
                         }
                     };
-                    self.visit_local(&place.local, ctx, location);
-                    self.visit_projection(place.local, reborrowed_proj, ctx, location);
+                    self.visit_local(&reborrowed_place_ref.local, ctx, location);
+                    self.visit_projection(reborrowed_place_ref, ctx, location);
                     return;
                 }
             }
             Rvalue::AddressOf(mutbl, place) => {
-                if let Some(reborrowed_proj) = place_as_reborrow(self.tcx, self.body, place) {
+                if let Some(reborrowed_place_ref) = place_as_reborrow(self.tcx, self.body, place) {
                     let ctx = match mutbl {
                         Mutability::Not => {
                             PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf)
                         }
                         Mutability::Mut => PlaceContext::MutatingUse(MutatingUseContext::AddressOf),
                     };
-                    self.visit_local(&place.local, ctx, location);
-                    self.visit_projection(place.local, reborrowed_proj, ctx, location);
+                    self.visit_local(&reborrowed_place_ref.local, ctx, location);
+                    self.visit_projection(reborrowed_place_ref, ctx, location);
                     return;
                 }
             }
@@ -1039,7 +1039,7 @@ fn place_as_reborrow(
     tcx: TyCtxt<'tcx>,
     body: &Body<'tcx>,
     place: Place<'tcx>,
-) -> Option<&'a [PlaceElem<'tcx>]> {
+) -> Option<PlaceRef<'tcx>> {
     match place.as_ref().last_projection() {
         Some((place_base, ProjectionElem::Deref)) => {
             // A borrow of a `static` also looks like `&(*_1)` in the MIR, but `_1` is a `const`
@@ -1048,13 +1048,14 @@ fn place_as_reborrow(
                 None
             } else {
                 // Ensure the type being derefed is a reference and not a raw pointer.
-                //
                 // This is sufficient to prevent an access to a `static mut` from being marked as a
                 // reborrow, even if the check above were to disappear.
                 let inner_ty = place_base.ty(body, tcx).ty;
-                match inner_ty.kind() {
-                    ty::Ref(..) => Some(place_base.projection),
-                    _ => None,
+
+                if let ty::Ref(..) = inner_ty.kind() {
+                    return Some(place_base);
+                } else {
+                    return None;
                 }
             }
         }
diff --git a/compiler/rustc_mir/src/transform/simplify.rs b/compiler/rustc_mir/src/transform/simplify.rs
index 11539d3ef30..ae4f15b3bbc 100644
--- a/compiler/rustc_mir/src/transform/simplify.rs
+++ b/compiler/rustc_mir/src/transform/simplify.rs
@@ -413,8 +413,7 @@ impl UsedLocals {
         } else {
             // A definition. Although, it still might use other locals for indexing.
             self.super_projection(
-                place.local,
-                &place.projection,
+                place.as_ref(),
                 PlaceContext::MutatingUse(MutatingUseContext::Projection),
                 location,
             );