code: public Object yyparse (yyInput yyLex, Object yydebug)
  				throws java.io.IOException {
  //t    this.yydebug = (jay.yydebug.yyDebug)yydebug;
      return yyparse(yyLex);
    }
docs: the generated parser, with debugging messages.
  Maintains a dynamic state and value stack.
  @param yyLex scanner.
  @param yydebug debug message writer implementing <tt>yyDebug</tt>, or <tt>null</tt>.
  @return result of the last reduction, if any.