anchor.diff:  }
   
   class _GeolocatorWidgetState extends State<GeolocatorWidget> {
  -  static final String _kLocationServicesDisabledMessage =
  +  static const String _locationServicesDisabledMessage =
         'Location services are disabled.';
  -  static final String _kPermissionDeniedMessage = 'Permission denied.';
  -  static final String _kPermissionDeniedForeverMessage =
  +  static const String _permissionDeniedMessage = 'Permission denied.';
  +  static const String _permissionDeniedForeverMessage =
         'Permission denied forever.';
  -  static final String _kPermissionGrantedMessage = 'Permission granted.';
  +  static const String _permissionGrantedMessage = 'Permission granted.';
   
     final GeolocatorPlatform _geolocatorPlatform = GeolocatorPlatform.instance;
     final List<_PositionItem> _positionItems = <_PositionItem>[];
  
positive.code:     // continue accessing the position of the device.
      _updatePositionList(
        _PositionItemType.log,
        _kPermissionGrantedMessage,
      );
      return true;
    }
  
negative.code:       // Permissions are denied forever, handle appropriately.
        _updatePositionList(
          _PositionItemType.log,
          _permissionDeniedForeverMessage,
        );
  
        return false;
  