| Index: sdk/lib/_internal/compiler/implementation/js_backend/namer.dart | 
| diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart | 
| index a9f6407372b4ab8d471c2ae5ecfa0edd966ba8a4..33804f656a471038d9ed31dcfb605763e2bb34ab 100644 | 
| --- a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart | 
| +++ b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart | 
| @@ -739,6 +739,8 @@ class Namer implements ClosureNamer { | 
| return 'String'; | 
| } else if (cls == backend.jsArrayClass) { | 
| return 'List'; | 
| +    } else if (cls == backend.jsNullClass) { | 
| +      return 'Null'; | 
| } else { | 
| return null; | 
| } | 
|  |