protected function variable(&$name)
    {
        $s = $this->seek();
        if ($this->literal($this->lessc->vPrefix, false) &&
            ($this->variable($sub) || $this->keyword($name))) {
            if (!empty($sub)) {
                $name = array('variable', $sub);
            } else {
                $name = $this->lessc->vPrefix.$name;
            }

            return true;
        }

        $name = null;
        $this->seek($s);

        return false;
    }