anchor.diff:      assert(serviceManager.isServiceAvailable);
       if (!_serviceInitialized && serviceManager.isServiceAvailable) {
         autoDisposeStreamSubscription(serviceManager
  -          .service.onStdoutEventWithHistory
  +          .service!.onStdoutEventWithHistory
             .listen(_handleStdoutEvent));
         autoDisposeStreamSubscription(serviceManager
  -          .service.onStderrEventWithHistory
  +          .service!.onStderrEventWithHistory
             .listen(_handleStderrEvent));
         autoDisposeStreamSubscription(serviceManager
  -          .service.onExtensionEventWithHistory
  +          .service!.onExtensionEventWithHistory
             .listen(_handleExtensionEvent));
         _serviceInitialized = true;
       }
  
positive.code: // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // @dart=2.9
  
  import 'package:flutter/foundation.dart';
  import 'package:vm_service/vm_service.dart';
  
negative.code: /// VM and events emitted from other UI.
  class ConsoleService extends Disposer {
    void appendInstanceRef({
      String? name,
      required InstanceRef? value,
      required RemoteDiagnosticsNode? diagnostic,
      required IsolateRef? isolateRef,
      bool forceScrollIntoView = false,
      bool expandAll = false,
    }) async {
  