anchor.diff:      return leftBracket;
     }
   
  -  /**
  -   * TODO(paulberry): add commas.
  -   */
  -  @override
  +  @override
  +  // TODO(paulberry): add commas.
     Iterable get childEntities => super._childEntities
       ..add(leftBracket)
       ..addAll(entries)
  
positive.code:   @override
    Token get beginToken => implementsKeyword;
  
    /**
     * TODO(paulberry): add commas.
     */
    @override
    Iterable get childEntities => new ChildEntities()
      ..add(implementsKeyword)
      ..addAll(interfaces);
  
negative.code:     _shownNames = new NodeList<SimpleIdentifier>(this, shownNames);
    }
  
    @override
    // TODO(paulberry): add commas.
    Iterable get childEntities => new ChildEntities()
      ..add(keyword)
      ..addAll(_shownNames);
  