From 6828a1edc63819120c7d11544f149cdd839ef915 Mon Sep 17 00:00:00 2001
From: ltdk <usr@ltdk.xyz>
Date: Fri, 4 Oct 2024 13:03:43 -0400
Subject: [PATCH] Stabilize UnsafeCell::from_mut

---
 library/core/src/cell.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/library/core/src/cell.rs b/library/core/src/cell.rs
index de212581e82..26be316a7b9 100644
--- a/library/core/src/cell.rs
+++ b/library/core/src/cell.rs
@@ -2115,7 +2115,6 @@ impl<T: ?Sized> UnsafeCell<T> {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(unsafe_cell_from_mut)]
     /// use std::cell::UnsafeCell;
     ///
     /// let mut val = 42;
@@ -2125,7 +2124,9 @@ impl<T: ?Sized> UnsafeCell<T> {
     /// assert_eq!(*uc.get_mut(), 41);
     /// ```
     #[inline(always)]
-    #[unstable(feature = "unsafe_cell_from_mut", issue = "111645")]
+    #[stable(feature = "unsafe_cell_from_mut", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "unsafe_cell_from_mut", since = "CURRENT_RUSTC_VERSION")]
+    #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_mut_refs))]
     pub const fn from_mut(value: &mut T) -> &mut UnsafeCell<T> {
         // SAFETY: `UnsafeCell<T>` has the same memory layout as `T` due to #[repr(transparent)].
         unsafe { &mut *(value as *mut T as *mut UnsafeCell<T>) }