I'm not entirely sure whether this is a bug. I'm trying to build a container manually with FrameworkBundle, TwigBundle and another bundle loaded with 2.7:
https://github.com/puli/symfony-bundle/blob/master/Tests/ContainerTest.php#L76

Upon running the test suite, the following error happens:

1. Puli\SymfonyBundle\Tests\ContainerTest::testTwigContainer
   Symfony\Component\DependencyInjection\Exception\InvalidArgumentException: The configure callable for class "Twig_Environment" is not a callable.

/home/bernhard/Entwicklung/Web/puli/symfony-bundle/vendor/symfony/dependency-injection/ContainerBuilder.php:989
/home/bernhard/Entwicklung/Web/puli/symfony-bundle/vendor/symfony/dependency-injection/ContainerBuilder.php:490
/home/bernhard/Entwicklung/Web/puli/symfony-bundle/Tests/ContainerTest.php:67

Apparently, the Definition object in the [Definition, 'configure'] callable is not resolved prior to checking whether the callable is valid. I don't understand where this should be happening. Is this a bug or a mistake on my side?

To reproduce, you can clone https://github.com/puli/symfony-bundle and run phpunit.