# File lib/Getopt/Declare2.rb, line 516
      def Arg.posflagpat(*t)
        if !@@posflagpat && @@flags
          @@posflagpat = '(?:' + ( @@flags.map { |i| 
                                  Regexp::quote(i) } ).join('|') + ')'
        else
          @@posflagpat
        end
      end