anchor.diff:     * Return a list containing all of the contributed analysis error result
      * descriptors for Dart sources.
      */
  +  @ExtensionPointId('DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID')
     List<TaskDescriptor> get dartErrorsForSource =>
         dartErrorsForSourceExtensionPoint.extensions;
   
  
positive.code:     }
    }
  }
  
negative.code:    * Return a list containing all of the contributed analysis error result
     * descriptors for Dart library specific units.
     */
    @ExtensionPointId('DART_ERRORS_FOR_UNIT_EXTENSION_POINT_ID')
    List<TaskDescriptor> get dartErrorsForUnit =>
        dartErrorsForUnitExtensionPoint.extensions;
  
  