Symfony version(s) affected: I believe master branch only

Description
Autowiring failures give this exception:

Error: Method class@anonymous::__toString() must not throw an exception, caught Symfony\Component\DependencyInjection\Exception\AutowiringFailedException:

How to reproduce

In a standard project, try to autowiring using an interface that doesn't exist - e.g.

<?php

namespace App\MessageHandler;

use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadataFactoryInterface;

class FooHandler
{
    public function __construct(ArgumentMetadataFactoryInterface $foo)
    {
    }
}

Possible Solution
I believe this is just an edge-case/bug from #29108