# File lib/juicer/binary.rb, line 68
    def set_opt(opt, value)
      opt = opt.to_sym
      if @options.key?(opt)
        @options[opt] = value
        @opt_set = true
      else
        msg = "Illegal option '#{opt}', specify one of: #{@options.keys.join(', ')}"
        raise ArgumentError.new(msg)
      end
    end