Add default implementation of Map::contains_key function

Map::contains_key can be implemented with Map::find.

Remove several implementations of contains_key.

1 files changed, 0 insertions, 8 deletions

diff --git a/src/libstd/hashmap.rs b/src/libstd/hashmap.rs
index e7d51106c58..424a6884d94 100644
--- a/src/libstd/hashmap.rs
+++ b/src/libstd/hashmap.rs
@@ -292,14 +292,6 @@ impl<K:Hash + Eq,V> Mutable for HashMap<K, V> {
 }
 
 impl<K:Hash + Eq,V> Map<K, V> for HashMap<K, V> {
-    /// Return true if the map contains a value for the specified key
-    fn contains_key(&self, k: &K) -> bool {
-        match self.bucket_for_key(k) {
-            FoundEntry(_) => {true}
-            TableFull | FoundHole(_) => {false}
-        }
-    }
-
     /// Return a reference to the value corresponding to the key
     fn find<'a>(&'a self, k: &K) -> Option<&'a V> {
         match self.bucket_for_key(k) {