anchor.diff:  
     /**
      * Return the name of the constructor to be invoked.
  -   *
  -   * @return the name of the constructor to be invoked
      */
     ConstructorName get constructorName => _constructorName;
   
     /**
  -   * Set the name of the constructor to be invoked to the given name.
  -   *
  -   * @param constructorName the name of the constructor to be invoked
  -   */
  -  void set constructorName(ConstructorName constructorName) {
  -    _constructorName = becomeParentOf(constructorName);
  +   * Set the name of the constructor to be invoked to the given [name].
  +   */
  +  void set constructorName(ConstructorName name) {
  +    _constructorName = becomeParentOf(name);
     }
   
     @override
     Token get endToken => _argumentList.endToken;
   
     /**
  -   * Return `true` if this creation expression is used to invoke a constant constructor.
  -   *
  -   * @return `true` if this creation expression is used to invoke a constant constructor
  +   * Return `true` if this creation expression is used to invoke a constant
  +   * constructor.
      */
     bool get isConst =>
         keyword is KeywordToken && (keyword as KeywordToken).keyword == Keyword.CONST;
  
positive.code:   FunctionBody _body;
  
    /**
     * The element associated with the function, or `null` if the AST structure has not been
     * resolved.
     */
    ExecutableElement element;
  
    /**
     * Initialize a newly created function declaration.
     *
     * @param parameters the parameters associated with the function
     * @param body the body of the function
     */
    FunctionExpression(FormalParameterList parameters, FunctionBody body) {
      _parameters = becomeParentOf(parameters);
  
negative.code:       ..add(_defaultValue);
  
    /**
     * Return the expression computing the default value for the parameter, or
     * `null` if there is no default value.
     */
    Expression get defaultValue => _defaultValue;
  
    /**
     * Set the expression computing the default value for the parameter to the
     * given [expression].
     */
    void set defaultValue(Expression expression) {
      _defaultValue = becomeParentOf(expression);
  