anchor.diff:            title: new Text('Plugin example app'),
           ),
           body: new Center(
  -          child: new Text('Running on: $_platformVersion\n'),
  +          child: new Text('Running on: $_version\n'),
           ),
         ),
       );
  
positive.code:       return;
  
      setState(() {
        _platformVersion = platformVersion;
      });
    }
  
  
negative.code: }
  
  class _MyAppState extends State<MyApp> {
    MediaStream _localStream;
    String _version = "0.0.1";
  
    @override
    initState() {
  