| Index: sdk/lib/io/platform_impl.dart
 | 
| diff --git a/sdk/lib/io/platform_impl.dart b/sdk/lib/io/platform_impl.dart
 | 
| index 8b858c9873a5e4069e200430c47ebb71b5212bb8..cee4e38075a2b6bcae0d1865d84fe7be8b1d2358 100644
 | 
| --- a/sdk/lib/io/platform_impl.dart
 | 
| +++ b/sdk/lib/io/platform_impl.dart
 | 
| @@ -87,6 +87,7 @@ class _CaseInsensitiveStringMap<V> implements Map<String, V> {
 | 
|    Iterable<V> get values => _map.values;
 | 
|    int get length => _map.length;
 | 
|    bool get isEmpty => _map.isEmpty;
 | 
| +  bool get isNotEmpty => _map.isNotEmpty;
 | 
|  
 | 
|    Map<String, V> _map;
 | 
|  }
 | 
| 
 |