anchor.diff:    bool limitInvalidationInTaskModel = false;
   
     /**
  +   * The plugins that are defined outside the `analyzer` package.
  +   */
  +  List<Plugin> _userDefinedPlugins = <Plugin>[];
  +
  +  /**
      * The task manager used to manage the tasks used to analyze code.
      */
     TaskManager _taskManager;
  
positive.code:       _taskManager.addGeneralResult(DART_ERRORS);
      }
      return _taskManager;
    }
  
    /**
  
negative.code:    * Perform work until the given [result] has been computed for the given
     * [target]. Return the computed value.
     */
    Object /*V*/ computeResult(
        AnalysisTarget target, ResultDescriptor /*<V>*/ result);
  
    /**
     * Notifies the context that the client is going to stop using this context.
  