# File lib/sass/script/parser.rb, line 103
      def parse_mixin_definition_arglist
        args, splat = defn_arglist!(false)
        assert_done

        args.each do |k, v|
          k.options = @options
          v.options = @options if v
        end
        splat.options = @options if splat
        return args, splat
      rescue Sass::SyntaxError => e
        e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
        raise e
      end