Hello,

I am using Symfony 3.3 on a project in which I am using TwigRendererInterface as a dependency for a service, and the injected service is @twig.form.engine, it works great since the service implements the mentioned interface.

But when I upgraded the project to the 3.4 version, I got an exception because the service @twig.form.engine does not implement the interface TwigRendererInterface anymore (changes made in commit 6ea71cb#diff-5eb0532c96734f6e23428e921225b2f0) , for me the solution is simple, I had just to change the type-hint, but I am thinking if this would be a BC break?

Best regards,