Remove redundant `mut` from variable declaration.

diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
index 59088e432917704f35a84b8c395e2c4eeb33242b..f9613556a1ebc1bd593e68a8ec5616db4184c532 100644 (file)
--- a/src/libcore/cmp.rs
+++ b/src/libcore/cmp.rs
@@ -319,7 +319,7 @@ impl Ordering {
     /// This method can be used to reverse a comparison:
     ///
     /// ```
-    /// let mut data: &mut [_] = &mut [2, 10, 5, 8];
+    /// let data: &mut [_] = &mut [2, 10, 5, 8];
     ///
     /// // sort the array from largest to smallest.
     /// data.sort_by(|a, b| a.cmp(b).reverse());