Avoid unnecessary renumbering

rust-lang-ci · Oct 16, 2023 · 2bba98b · 2bba98b
1 parent 9ace9da
commit 2bba98b
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/compiler/rustc_borrowck/src/renumber.rs b/compiler/rustc_borrowck/src/renumber.rs
@@ -81,6 +81,10 @@ impl<'a, 'tcx> MutVisitor<'tcx> for RegionRenumberer<'a, 'tcx> {
 
     #[instrument(skip(self), level = "debug")]
     fn visit_ty(&mut self, ty: &mut Ty<'tcx>, ty_context: TyContext) {
+        if matches!(ty_context, TyContext::ReturnTy(_)) {
+            // We will renumber the return ty when called again with `TyContext::LocalDecl`
+            return;
+        }
         *ty = self.renumber_regions(*ty, || RegionCtxt::TyContext(ty_context));
 
         debug!(?ty);