Symfony version(s) affected

6.4.0

Description

When the handler is a generator (which you might want if using it sync, and shouldn't be an issue when using async, the values just get ignored), Messenger doesn't recognize failures to execute the handler.

How to reproduce

Do this

#[AsHandler]
class MessageHandler {
     function __invoke(Message $message): iterable
    {
        dd($message);
        yield $message;
    }
}

From my experimentations, this works as expected when using sync transport, but fails with async (in my case Redis), it doesn't recognize the handler having failed.

Possible Solution

Check for the handler being a generator?

Additional Context

No response