public function clearCacheFiles()
    {
        @trigger_error(sprintf('The %s method is deprecated since version 1.22 and will be removed in Twig 2.0.', __METHOD__), E_USER_DEPRECATED);

        if (is_string($this->originalCache)) {
            foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($this->originalCache), RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
                if ($file->isFile()) {
                    @unlink($file->getPathname());
                }
            }
        }
    }