From 417e4b41bbf347a183766c97055ac6625cff1e70 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <japaric@linux.com>
Date: Sun, 31 Aug 2014 02:09:46 -0500
Subject: [PATCH] &mut [T] now implements Collection. Fixes #16896

---
 src/libcore/slice.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/libcore/slice.rs b/src/libcore/slice.rs
index 5070a3973d1..dc048bf5ed4 100644
--- a/src/libcore/slice.rs
+++ b/src/libcore/slice.rs
@@ -991,6 +991,15 @@ impl<'a, T> Collection for &'a [T] {
     }
 }
 
+#[experimental = "trait is experimental"]
+impl<'a, T> Collection for &'a mut [T] {
+    /// Returns the length of a vector
+    #[inline]
+    fn len(&self) -> uint {
+        self.repr().len
+    }
+}
+
 #[unstable = "waiting for DST"]
 impl<'a, T> Default for &'a [T] {
     fn default() -> &'a [T] { &[] }