# File lib/Getopt/Declare2.rb, line 506
      def Arg.negflagpat(*t)
        if !@@negflagpat && @@flags
          @@negflagpat = ( @@flags.map { |i| 
                          "(?!" + Regexp::quote(i) + ")" } ).join('')
        else
          @@negflagpat
        end
      end