# File lib/sass/script/functions.rb, line 736
    def hsl(hue, saturation, lightness)
      if calc?(hue) || calc?(saturation) || calc?(lightness)
        unquoted_string("hsl(#{hue}, #{saturation}, #{lightness})")
      else
        hsla(hue, saturation, lightness, number(1))
      end
    end