anchor.diff:  
       connectedApp = ConnectedApp();
   
  -    service.onEvent(kServiceStream).listen((e) {
  +    void handleServiceEvent(Event e) {
         if (e.kind == EventKind.kServiceRegistered) {
           if (!_registeredMethodsForService.containsKey(e.service)) {
             _registeredMethodsForService[e.service] = [e.method];
  
positive.code:       try {
          await service.streamListen(id);
        } catch (e) {
          // Don't complain about '_Logging' or 'Logging' events (newer VMs don't
          // support '_Logging' and older VMs don't support 'Logging').
          // TODO(devoncarew): Remove this check on or after approx. Oct 1 2019.
          if (!id.endsWith('Logging')) {
            print("Service client stream not supported: '$id'\n  $e");
          }
        }
  
negative.code:     VmServiceWrapper service, {
      @required Future<void> onClosed,
    }) async {
      const kServiceStreamOld = '_Service';
      const kServiceStreamNew = 'Service';
  
      final vm = await service.getVM();
      this.vm = vm;
  