From 74aad5ce56e685761ed6ea791c542a0097c7b4d7 Mon Sep 17 00:00:00 2001
From: Neven Villani <vanille@crans.org>
Date: Tue, 20 Jun 2023 16:30:44 +0200
Subject: [PATCH] `Adt` for `Unique` may contain a reference

---
 compiler/rustc_mir_transform/src/add_retag.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/rustc_mir_transform/src/add_retag.rs b/compiler/rustc_mir_transform/src/add_retag.rs
index 187d38b385be3..d9e7339f1b274 100644
--- a/compiler/rustc_mir_transform/src/add_retag.rs
+++ b/compiler/rustc_mir_transform/src/add_retag.rs
@@ -28,6 +28,7 @@ fn may_contain_reference<'tcx>(ty: Ty<'tcx>, depth: u32, tcx: TyCtxt<'tcx>) -> b
         // References
         ty::Ref(..) => true,
         ty::Adt(..) if ty.is_box() => true,
+        ty::Adt(adt, _) if Some(adt.did()) == tcx.lang_items().ptr_unique() => true,
         // Compound types: recurse
         ty::Array(ty, _) | ty::Slice(ty) => {
             // This does not branch so we keep the depth the same.