anchor.diff:     * [leftParenthesis]. Return the formal parameters that were parsed.
      */
     FormalParameterList _parseFormalParameterListAfterParen(Token leftParenthesis,
  -      {bool inFunctionType = false}) {
  +      {bool inFunctionType: false}) {
       if (_matches(TokenType.CLOSE_PAREN)) {
         return astFactory.formalParameterList(
             leftParenthesis, null, null, null, getAndAdvance());
  
positive.code:    *       | type
     */
    FinalConstVarOrType parseFinalConstVarOrType(bool optional,
        {bool inFunctionType = false}) {
      Token keywordToken = null;
      TypeName type = null;
      Keyword keyword = _currentToken.keyword;
  
negative.code:    * This method assumes that the current token matches `TokenType.OPEN_PAREN`.
     */
    FormalParameterList _parseFormalParameterListUnchecked(
        {bool inFunctionType: false}) {
      return _parseFormalParameterListAfterParen(getAndAdvance(),
          inFunctionType: inFunctionType);
    }
  