From 5383205555cf8b498deb849682c50dd5029739be Mon Sep 17 00:00:00 2001
From: panicbit <panicbit.dev@gmail.com>
Date: Mon, 7 Aug 2017 12:54:40 +0200
Subject: [PATCH] Fix Option<&mut T>::cloned doc test

---
 src/libcore/option.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index 5328877a64b..a3f449f1b2d 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -781,6 +781,7 @@ impl<'a, T: Clone> Option<&'a mut T> {
     /// # Examples
     ///
     /// ```
+    /// #![feature(option_ref_mut_cloned)]
     /// let mut x = 12;
     /// let opt_x = Some(&mut x);
     /// assert_eq!(opt_x, Some(&mut 12));