---

yaml
---
r: 143223
b: refs/heads/try2
c: 625ca7a
h: refs/heads/master
i:
  143221: a8f7962
  143219: f48790c
  143215: 1ccb8d3
v: v3

Author: blake2-ppc

[refs]

@@ -5,7 +5,7 @@ refs/heads/snap-stage3: 78a7676898d9f80ab540c6df5d4c9ce35bb50463
 refs/heads/try: 519addf6277dbafccbb4159db4b710c37eaa2ec5
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b
-refs/heads/try2: 5991c607501595b32998a3367171ca42f5d8ef0b
+refs/heads/try2: 625ca7afe4fb50758215d623d45de84a5f4290ae
 refs/heads/dist-snap: ba4081a5a8573875fed17545846f6f6902c8ba8d
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503

branches/try2/src/libstd/option.rs

@@ -159,6 +159,17 @@ impl<T> Option<T> {
         }
     }
 
+    /// Update an optional value by optionally running its content by mut reference
+    /// through a function that returns an option.
+    #[inline]
+    pub fn chain_mut_ref<'a, U>(&'a mut self, f: &fn(x: &'a mut T) -> Option<U>)
+                                -> Option<U> {
+        match *self {
+            Some(ref mut x) => f(x),
+            None => None
+        }
+    }
+
     /// Filters an optional value using given function.
     #[inline(always)]
     pub fn filtered(self, f: &fn(t: &T) -> bool) -> Option<T> {