anchor.diff:  // widget_inspector.dart library so using protected members is fine.
   // ignore_for_file: invalid_use_of_visible_for_testing_member
   // ignore_for_file: invalid_use_of_protected_member
  -
  -// This annotation should stay here for compatibility with legacy code.
  -// @dart=2.9
   
   import 'dart:async';
   import 'dart:convert';
  
positive.code:     throw 'Dummy extension method to make the code type check when it calls private members';
    }
  
    List<String> /*?*/ get _pubRootDirectories {
      throw 'Dummy extension method to make the code type check when it calls private members';
    }
  }
  
negative.code:     final groupName = parameters['groupName'];
  
      final result = instance._nodeToJson(
        WidgetsBinding.instance.renderViewElement?.toDiagnosticsNode(),
        InspectorSerializationDelegate(
          groupName: groupName,
          subtreeDepth: 1000000,
  