From 07af6f0f43a2f96c0f4fa8afbf1c383539d18030 Mon Sep 17 00:00:00 2001
From: Jonathan S <gereeter@gmail.com>
Date: Thu, 20 Nov 2014 10:34:54 -0600
Subject: [PATCH] Implement BorrowFrom<&'a T> for T (with mutable variants)

---
 src/libcore/borrow.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/libcore/borrow.rs b/src/libcore/borrow.rs
index f0a14c02382..70b1bc16227 100644
--- a/src/libcore/borrow.rs
+++ b/src/libcore/borrow.rs
@@ -69,8 +69,16 @@ impl<Sized? T> BorrowFromMut<T> for T {
     fn borrow_from_mut(owned: &mut T) -> &mut T { owned }
 }
 
-impl BorrowFrom<&'static str> for str {
-    fn borrow_from<'a>(owned: &'a &'static str) -> &'a str { &**owned }
+impl<'a, Sized? T> BorrowFrom<&'a T> for T {
+    fn borrow_from<'b>(owned: &'b &'a T) -> &'b T { &**owned }
+}
+
+impl<'a, Sized? T> BorrowFrom<&'a mut T> for T {
+    fn borrow_from<'b>(owned: &'b &'a mut T) -> &'b T { &**owned }
+}
+
+impl<'a, Sized? T> BorrowFromMut<&'a mut T> for T {
+    fn borrow_from_mut<'b>(owned: &'b mut &'a mut T) -> &'b mut T { &mut **owned }
 }
 
 /// A generalization of Clone to borrowed data.