symfony/src/Symfony/Bundle/TwigBundle/TwigBundle.php

<?php

namespace Symfony\Bundle\TwigBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigEnvironmentPass;

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Bundle.
 *
 * @author Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class TwigBundle extends Bundle
{
    public function registerExtensions(ContainerBuilder $container)
    {
        parent::registerExtensions($container);

        $container->addCompilerPass(new TwigEnvironmentPass());
    }
}