From d4ee6982e459c7a39051b15920a07cda2810a8f2 Mon Sep 17 00:00:00 2001
From: Ankit Chandawala <achandaw@amazon.com>
Date: Tue, 21 Sep 2021 09:31:59 +0100
Subject: [PATCH] Fix match for placeholder region

---
 compiler/rustc_middle/src/ich/impls_ty.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_middle/src/ich/impls_ty.rs b/compiler/rustc_middle/src/ich/impls_ty.rs
index 8e53e4ba948..3b0640eb98d 100644
--- 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)
             }
         }