| Index: sdk/lib/collection/linked_hash_set.dart
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| diff --git a/sdk/lib/collection/linked_hash_set.dart b/sdk/lib/collection/linked_hash_set.dart
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| index e866b6369893b8a1e999f91104cb931864bf1a4c..ee9cdb14e2eac704fcfebb5515b2b9065bbd28d3 100644
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| --- a/sdk/lib/collection/linked_hash_set.dart
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| +++ b/sdk/lib/collection/linked_hash_set.dart
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| @@ -19,6 +19,8 @@ class LinkedHashSet<E> extends _HashSetBase<E> {
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|  
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|    external bool get isEmpty;
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|  
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| +  external bool get isNotEmpty;
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| +
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|    external bool contains(Object object);
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|  
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|    external void forEach(void action(E element));
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| 
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