public static function getRegionBundle()
    {
        @trigger_error(sprintf('The method "%s()" is deprecated since Symfony 4.3, use "%s" instead.', __METHOD__, Regions::class), E_USER_DEPRECATED);

        if (null === self::$regionBundle) {
            self::$regionBundle = new RegionBundle(
                self::getDataDirectory().'/'.self::REGION_DIR,
                self::getEntryReader(),
                self::$localeBundle ?? self::$localeBundle = new LocaleBundle(self::getDataDirectory().'/'.self::LOCALE_DIR, self::getEntryReader())
            );
        }

        return self::$regionBundle;
    }