Implemented BorrowFrom<Rc<T>> for T.

diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 53891583edb20c768fa2068498511b8a76b2c5b8..217c898e661a0596c2470c149b57201f2df7c72d 100644 (file)
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -141,6 +141,7 @@
 
 #![stable]
 
+use core::borrow::BorrowFrom;
 use core::cell::Cell;
 use core::clone::Clone;
 use core::cmp::{PartialEq, PartialOrd, Eq, Ord, Ordering};
@@ -349,6 +350,12 @@ pub fn make_unique(&mut self) -> &mut T {
     }
 }
 
+impl<T> BorrowFrom<Rc<T>> for T {
+    fn borrow_from(owned: &Rc<T>) -> &T {
+        &**owned
+    }
+}
+
 #[experimental = "Deref is experimental."]
 impl<T> Deref<T> for Rc<T> {
     #[inline(always)]