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-rw-r--r--src/libstd/container.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/container.rs b/src/libstd/container.rs
index 22525d4cab4..c91a53f9663 100644
--- a/src/libstd/container.rs
+++ b/src/libstd/container.rs
@@ -38,6 +38,7 @@ pub trait Map<K, V>: Container {
     fn find<'a>(&'a self, key: &K) -> Option<&'a V>;
 
     /// Return true if the map contains a value for the specified key
+    #[inline]
     fn contains_key(&self, key: &K) -> bool {
         self.find(key).is_some()
     }