Rollup merge of rust-lang#89142 - nerandell:master, r=jackh726

Fix match for placeholder region cc rust-lang#89118
the8472 · Sep 21, 2021 · aca790b · aca790b
2 parents 17c9a22 + d4ee698
commit aca790b
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/compiler/rustc_middle/src/ich/impls_ty.rs b/compiler/rustc_middle/src/ich/impls_ty.rs
@@ -90,7 +90,10 @@ impl<'a> HashStable<StableHashingContext<'a>> for ty::RegionKind {
             ty::ReFree(ref free_region) => {
                 free_region.hash_stable(hcx, hasher);
             }
-            ty::ReVar(..) | ty::RePlaceholder(..) => {
+            ty::RePlaceholder(p) => {
+                p.hash_stable(hcx, hasher);
+            }
+            ty::ReVar(..) => {
                 bug!("StableHasher: unexpected region {:?}", *self)
             }
         }