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-rw-r--r--src/libcore/container.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/container.rs b/src/libcore/container.rs
index 9eba2c7105c..e20821b919b 100644
--- a/src/libcore/container.rs
+++ b/src/libcore/container.rs
@@ -42,7 +42,7 @@ pub trait Map<K, V>: Mutable {
     fn find(&self, key: &K) -> Option<&'self V>;
 
     /// Return a mutable reference to the value corresponding to the key
-    //fn find_mut(&mut self, key: &K) -> Option<&'self mut V>;
+    fn find_mut(&mut self, key: &K) -> Option<&'self mut V>;
 
     /// Insert a key-value pair into the map. An existing value for a
     /// key is replaced by the new value. Return true if the key did