# File lib/sass/script/tree/list_literal.rb, line 29
    def to_sass(opts = {})
      return "()" if elements.empty?
      members = elements.map do |v|
        if element_needs_parens?(v)
          "(#{v.to_sass(opts)})"
        else
          v.to_sass(opts)
        end
      end

      return "(#{members.first},)" if separator == :comma && members.length == 1

      members.join(sep_str(nil))
    end