| Index: sdk/lib/_internal/compiler/implementation/lib/constant_map.dart
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| diff --git a/sdk/lib/_internal/compiler/implementation/lib/constant_map.dart b/sdk/lib/_internal/compiler/implementation/lib/constant_map.dart
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| index d84b4a574435c1d6270a9d2adf547e1c87d7928f..1647f32c9e534a747b743947b230aadb307d26dc 100644
 | 
| --- a/sdk/lib/_internal/compiler/implementation/lib/constant_map.dart
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| +++ b/sdk/lib/_internal/compiler/implementation/lib/constant_map.dart
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| @@ -40,6 +40,8 @@ class ConstantMap<V> implements Map<String, V> {
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|  
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|    bool get isEmpty => length == 0;
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|  
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| +  bool get isNotEmpty => !isEmpty;
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| +
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|    String toString() => Maps.mapToString(this);
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|  
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|    _throwUnmodifiable() {
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| 
 |