Move the Borrow and BorrowMut traits to libcore.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index bb2daa2a1d7..b68d7976540 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -73,6 +73,7 @@ use boxed::Box;
 
 use core::sync::atomic;
 use core::sync::atomic::Ordering::{Relaxed, Release, Acquire, SeqCst};
+use core::borrow;
 use core::fmt;
 use core::cmp::Ordering;
 use core::mem::{align_of_val, size_of_val};
@@ -1109,3 +1110,7 @@ mod tests {
         assert!(y.upgrade().is_none());
     }
 }
+
+impl<T: ?Sized> borrow::Borrow<T> for Arc<T> {
+    fn borrow(&self) -> &T { &**self }
+}