From ddfcd934a34659bc626f02911aeaf92bfe5f1f0c Mon Sep 17 00:00:00 2001
From: Max Dexheimer <maxdexh03@gmail.com>
Date: Wed, 30 Sep 2026 20:25:50 +0200
Subject: [PATCH] Remove `T: Send + Sync` bound from `Arc::downcast`

---
 library/alloc/src/rcs/arc.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/library/alloc/src/rcs/arc.rs b/library/alloc/src/rcs/arc.rs
index e61ea5193eccb..0c62a4cd35f58 100644
--- a/library/alloc/src/rcs/arc.rs
+++ b/library/alloc/src/rcs/arc.rs
@@ -3045,7 +3045,7 @@ impl<A: Allocator> Arc<dyn Any + Send + Sync, A> {
     #[stable(feature = "rc_downcast", since = "1.29.0")]
     pub fn downcast<T>(self) -> Result<Arc<T, A>, Self>
     where
-        T: Any + Send + Sync,
+        T: Any,
     {
         if (*self).is::<T>() {
             // SAFETY: Check ensures the typecast is okay.
@@ -3088,7 +3088,7 @@ impl<A: Allocator> Arc<dyn Any + Send + Sync, A> {
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     pub unsafe fn downcast_unchecked<T>(self) -> Arc<T, A>
     where
-        T: Any + Send + Sync,
+        T: Any,
     {
         // SAFETY: Upheld by caller.
         unsafe {