protected function validateTemplate(\Twig_Environment $twig, OutputInterface $output, $template, $file = null)
{
try {
$twig->parse($twig->tokenize($template, $file ? (string) $file : null));
$output->ok($template, $file);
} catch (\Twig_Error $e) {
$output->error($template, $e, $file);
return 1;
}
return 0;
}