| Index: samples/swarm/swarm_ui_lib/observable/observable.dart | 
| diff --git a/samples/swarm/swarm_ui_lib/observable/observable.dart b/samples/swarm/swarm_ui_lib/observable/observable.dart | 
| index 47564e5a7c1f959cb897463dc158b468f9fb306b..d6789885634a39dbf415469974fb6868141f0e14 100644 | 
| --- a/samples/swarm/swarm_ui_lib/observable/observable.dart | 
| +++ b/samples/swarm/swarm_ui_lib/observable/observable.dart | 
| @@ -257,11 +257,7 @@ class ObservableList<T> | 
| throw new UnimplementedError(); | 
| } | 
|  | 
| -  void removeRange(int start, int length) { | 
| -    throw new UnimplementedError(); | 
| -  } | 
| - | 
| -  void insertRange(int start, int length, [initialValue = null]) { | 
| +  void removeRange(int start, int end) { | 
| throw new UnimplementedError(); | 
| } | 
|  | 
|  |