From d634f14f26dc6640a9b6cd8b5f896aaf1ecc3cb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20Rakic?= <remy.rakic+github@gmail.com>
Date: Tue, 28 Jun 2022 22:25:58 +0200
Subject: [PATCH] avoid walk when `get_ptr_alloc` returns no `AllocRef`

---
 compiler/rustc_const_eval/src/interpret/intern.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/compiler/rustc_const_eval/src/interpret/intern.rs b/compiler/rustc_const_eval/src/interpret/intern.rs
index 2f384247caa..9997bb2c0fd 100644
--- a/compiler/rustc_const_eval/src/interpret/intern.rs
+++ b/compiler/rustc_const_eval/src/interpret/intern.rs
@@ -197,6 +197,9 @@ impl<'rt, 'mir, 'tcx: 'mir, M: CompileTimeMachine<'mir, 'tcx, const_eval::Memory
                     if !alloc.has_relocations() {
                         return Ok(false);
                     }
+                } else {
+                    // We're encountering a ZST here, and can avoid the walk as well.
+                    return Ok(false);
                 }
             }