anchor.diff:      try {
         final Map<String, String> serialized = command.serialize();
         _logCommunication('>>> $serialized');
  -      final Future<Map<String, dynamic>> future = _appIsolate.invokeExtension(
  +      final Future<Map<String, dynamic>> future = appIsolate.invokeExtension(
           _flutterExtensionMethodName,
           serialized,
         ).then<Map<String, dynamic>>((Object value) => value);
  
positive.code:   /// Returns a [Future] that fires once the connection has been closed.
    Future<void> close() async {
      // Don't leak vm_service_client-specific objects, if any
      await _serviceClient.close();
      await _peer.close();
    }
  }
  
negative.code: /// Drives a Flutter Application running in another process.
  class FlutterDriver {
    /// Creates a driver that uses a connection provided by the given
    /// [serviceClient], [_peer] and [appIsolate].
    @visibleForTesting
    FlutterDriver.connectedTo(
      this.serviceClient,
      this._peer,
      this.appIsolate, {
      bool printCommunication = false,
      bool logCommunicationToFile = true,
    }) : _printCommunication = printCommunication,
  