From a7a0225a281bbb9306862e647aee2f51aa595086 Mon Sep 17 00:00:00 2001
From: Georg Semmler <georg_semmler_05@web.de>
Date: Fri, 10 Aug 2018 14:21:17 +0200
Subject: [PATCH] Also add a `From` implementation for `&mut Option<T>` ->
 `Option<&mut T>'

---
 src/libcore/option.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index 883e01ff2a8..32a0a8b3c51 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -1071,6 +1071,13 @@ fn from(o: &'a Option<T>) -> Option<&'a T> {
     }
 }
 
+#[stable(feature = "option_ref_from_ref_option", since = "1.30.0")]
+impl<'a, T> From<&'a mut Option<T>> for Option<&'a mut T> {
+    fn from(o: &'a mut Option<T>) -> Option<&'a mut T> {
+        o.as_mut()
+    }
+}
+
 /////////////////////////////////////////////////////////////////////////////
 // The Option Iterators
 /////////////////////////////////////////////////////////////////////////////
-- 
2.44.0