# File lib/sprockets/sass/functions.rb, line 75
      def image_url(source, options = {}, cache_buster = nil)
        # Work with the Compass #image_url API
        if options.respond_to? :value
          case options.value
          when true
            return image_path source
          else
            options = {}
          end
        end
        ::Sass::Script::String.new "url(#{image_path(source, options)})"
      end