Chromium Code Reviews| Index: sdk/lib/collection/hash_set.dart | 
| diff --git a/sdk/lib/collection/hash_set.dart b/sdk/lib/collection/hash_set.dart | 
| index c459f9900b21696e1fd3869479120f60e2393d49..8d484db877728f252108cdf80aa4eea2097aa22e 100644 | 
| --- a/sdk/lib/collection/hash_set.dart | 
| +++ b/sdk/lib/collection/hash_set.dart | 
| @@ -70,6 +70,8 @@ class HashSet<E> extends _HashSetBase<E> { | 
| external bool get isEmpty; | 
| + external bool get isNotEmpty; | 
| + | 
| external bool contains(Object object); | 
| // Collection. |