From 3278e793b2d0332c6659b732178892aab11654ee Mon Sep 17 00:00:00 2001
From: Remi Rampin <remirampin@gmail.com>
Date: Wed, 1 Jul 2015 17:58:05 -0400
Subject: [PATCH] Implement CoerceUnsized for arc::Weak

---
 src/liballoc/arc.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index dd9c1d1fd188..c84649f92e7f 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -145,6 +145,8 @@ pub struct Weak<T: ?Sized> {
 unsafe impl<T: ?Sized + Sync + Send> Send for Weak<T> { }
 unsafe impl<T: ?Sized + Sync + Send> Sync for Weak<T> { }
 
+impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Weak<U>> for Weak<T> {}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized + fmt::Debug> fmt::Debug for Weak<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {