# File lib/less/engine/nodes/function.rb, line 79
      def evaluate context = nil
        if Functions.available.include? self.to_sym
          send to_sym, *@args
        else
          args = @args.map { |e|
            e.parent = self.parent
            e = e.evaluate(context) if e.respond_to?(:evaluate)
            e.to_css
          }  * ', '
          Node::Anonymous.new("#{to_sym}(#{args})")
        end
      end