anchor.diff:    @override
     Element get bestElement => staticElement;
   
  -  /**
  -   * TODO(paulberry): add "." tokens.
  -   */
  -  @override
  +  @override
  +  // TODO(paulberry): add "." tokens.
     Iterable get childEntities => new ChildEntities()..addAll(_components);
   
     /**
  
positive.code:   @override
    Token get beginToken => poundSign;
  
    /**
     * TODO(paulberry): add "." tokens.
     */
    @override
    Iterable get childEntities => new ChildEntities()
      ..add(poundSign)
      ..addAll(components);
  
negative.code:   @override
    Token get beginToken => leftBracket;
  
    @override
    // TODO(paulberry): Add commas.
    Iterable get childEntities => new ChildEntities()
      ..add(leftBracket)
      ..addAll(_arguments)
  