From 703d7b519e69daf03e34edcd1af2957e393414b5 Mon Sep 17 00:00:00 2001
From: Aaronepower <theaaronepower@gmail.com>
Date: Thu, 16 Jun 2016 14:44:56 +0100
Subject: [PATCH] Added Default trait for Cow

---
 src/libcollections/borrow.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/libcollections/borrow.rs b/src/libcollections/borrow.rs
index 6ca0db68a88ce..37dbeb4eae17d 100644
--- a/src/libcollections/borrow.rs
+++ b/src/libcollections/borrow.rs
@@ -15,6 +15,7 @@
 use core::clone::Clone;
 use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
 use core::convert::AsRef;
+use core::default::Default;
 use core::hash::{Hash, Hasher};
 use core::marker::Sized;
 use core::ops::Deref;
@@ -248,6 +249,16 @@ impl<'a, B: ?Sized> fmt::Display for Cow<'a, B>
     }
 }
 
+#[stable(feature = "default", since = "1.11.0")]
+impl<'a, B: ?Sized> Default for Cow<'a, B>
+    where B: ToOwned,
+          <B as ToOwned>::Owned: Default
+{
+    fn default() -> Cow<'a, B> {
+        Owned(<B as ToOwned>::Owned::default())
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, B: ?Sized> Hash for Cow<'a, B> where B: Hash + ToOwned {
     #[inline]