# File lib/sass/script/value/helpers.rb, line 161
    def parse_complex_selector(value, name = nil, allow_parent_ref = false)
      selector = parse_selector(value, name, allow_parent_ref)
      return seq if selector.members.length == 1

      err = "#{value.inspect} is not a complex selector"
      err = "$#{name.to_s.gsub('_', '-')}: #{err}" if name
      raise ArgumentError.new(err)
    end