Error in The Form Component

[topwebstudio]

https://symfony.com/doc/master/components/form.html

$twig->addExtension(
    new FormExtension(new TwigRenderer($formEngine, $csrfManager))
);

This line throws an error.

Uncaught exception 'InvalidArgumentException' with message 'Passing any arguments the constructor of Symfony\Bridge\Twig\Extension\FormExtension is reserved for internal use.'

[xabbuh]

We indeed need to update the example. Thank you for reporting it @topwebstudio!

However, I wonder why you get the exception and do not see a deprecation being triggered here: https://github.com/symfony/symfony/blob/3.2/src/Symfony/Bridge/Twig/Extension/FormExtension.php#L35

[topwebstudio]

I followed the guide for the Form component outside Symfony scope (as a standalone).

[xabbuh]

@topwebstudio Indeed, I was able to reproduce your initial issue (see the related PR symfony/symfony#20882 which will lead to the expected deprecation instead of the exception).

Nonetheless, we still need to update the documentation. So thanks again for reporting the issue! :)

[topwebstudio]

I don't know if this is related to Form Component documentation errors above, but when following the official documentation I'm running into new error:

Fatal error: Uncaught exception 'Twig_Error_Runtime' with message 'Unable to load the "Symfony\Bridge\Twig\Form\TwigRenderer" runtime.'

I've made pretty minimalistic example to display this error:
https://github.com/topwebstudio/symfonyform

[xabbuh]

@topwebstudio Can you report this as a bug in the code repository?

[topwebstudio]

Here is the bug report link