    # File lib/compass/sass_extensions/functions/font_files.rb, line 2
      def font_files(*args)
        raise Sass::SyntaxError, "An even number of arguments must be passed to font_files()" unless args.size % 2 == 0
        files = []
        while args.size > 0
          files << "#{font_url(args.shift)} format('#{args.shift}')"
        end
        Sass::Script::String.new(files.join(", "))
      end