| Index: lib/compiler/implementation/native_handler.dart
 | 
| ===================================================================
 | 
| --- lib/compiler/implementation/native_handler.dart	(revision 6623)
 | 
| +++ lib/compiler/implementation/native_handler.dart	(working copy)
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| @@ -26,6 +26,11 @@
 | 
|          () => <ClassElement>[]);
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|      subtypes.add(cls);
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|    }
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| +
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| +  List<Element> directSubtypes = emitter.directSubtypes.putIfAbsent(
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| +      cls.superclass,
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| +      () => <ClassElement>[]);
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| +  directSubtypes.add(cls);
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|  }
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|  
 | 
|  void processNativeClassesInLibrary(Compiler compiler,
 | 
| 
 |