# File lib/compass/sass_extensions/functions/gradient_support.rb, line 10
    def initialize(color, stop = nil)
      unless Sass::Script::Color === color ||
             Sass::Script::Funcall === color ||
             (Sass::Script::String === color && color.value == "transparent")
        raise Sass::SyntaxError, "Expected a color. Got: #{color}"
      end
      if stop && !stop.is_a?(Sass::Script::Number)
        raise Sass::SyntaxError, "Expected a number. Got: #{stop}"
      end
      self.color, self.stop = color, stop
    end