# File lib/sass/script/funcall.rb, line 45
      def to_sass(opts = {})
        args = @args.map {|a| a.to_sass(opts)}.join(', ')
        keywords = @keywords.sort_by {|k, v| k}.
          map {|k, v| "$#{dasherize(k, opts)}: #{v.to_sass(opts)}"}.join(', ')
        "#{dasherize(name, opts)}(#{args}#{', ' unless args.empty? || keywords.empty?}#{keywords})"
      end