public function ensureIlluminateBase(Container $app = null)
    {
        if (! $app->bound('events')) {
            $app->singleton('events', $this->illuminateClasses['events']);
            $app['events']->fire('booting');
        }

        if (! $app->bound('files')) {
            $app->bindIf('files', $this->illuminateClasses['files']);
        }
    }