public function getSource()
    {
        if (!$this->deprecationTriggered && (\func_num_args() < 1 || func_get_arg(0))) {
            @trigger_error(sprintf('The "%s" class is deprecated since version 4.3 and will be removed in 5.0. Use strings as roles instead.', __CLASS__), E_USER_DEPRECATED);

            $this->deprecationTriggered = true;
        }

        return $this->source;
    }