From b57b9980803209c683fb87bbd4654f98dba7b8e8 Mon Sep 17 00:00:00 2001
From: Jeremy Smart <jeremy3141592@gmail.com>
Date: Thu, 21 Aug 2025 17:06:27 -0400
Subject: [PATCH] unstably constify ptr::drop_in_place

---
 library/core/src/ptr/mod.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/library/core/src/ptr/mod.rs b/library/core/src/ptr/mod.rs
index f5c490ca7cea3..89b7e34687e56 100644
--- a/library/core/src/ptr/mod.rs
+++ b/library/core/src/ptr/mod.rs
@@ -801,7 +801,8 @@ pub const unsafe fn write_bytes<T>(dst: *mut T, val: u8, count: usize) {
 #[lang = "drop_in_place"]
 #[allow(unconditional_recursion)]
 #[rustc_diagnostic_item = "ptr_drop_in_place"]
-pub unsafe fn drop_in_place<T: PointeeSized>(to_drop: *mut T) {
+#[rustc_const_unstable(feature = "const_drop_in_place", issue = "109342")]
+pub const unsafe fn drop_in_place<T: PointeeSized>(to_drop: *mut T) {
     // Code here does not matter - this is replaced by the
     // real drop glue by the compiler.