# File lib/sass/tree/root_node.rb, line 100
      def _to_s(*args)
        result = String.new
        children.each do |child|
          next if child.invisible?
          child_str = child.to_s(1)
          result << child_str + (style == :compressed ? '' : "\n")
        end
        result.rstrip!
        return "" if result.empty?
        return result + "\n"
      end