symfony/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/TranslatorPass.php

<?php

namespace Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;

class TranslatorPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        if (!$container->hasDefinition('translator')) {
            return;
        }

        $loaders = array();
        foreach ($container->findTaggedServiceIds('translation.loader') as $id => $attributes) {
            $loaders[$id] = $attributes[0]['alias'];
        }
        $container->setParameter('translation.loaders', $loaders);
    }
}