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[EventDispatcher] LegacyEventDispatcherProxy incompatible with WrappedListener #31457

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@keulinho

Description

@keulinho

Symfony version(s) affected: 4.3.0

Description
The \Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy implements the EventDispatcherInterface from the Contracts Bundle, but the \Symfony\Component\EventDispatcher\Debug\WrappedListener expects the EventDispatcherInterface from the EventDispatcher Bundle in its __invoke() method.

This leads to the error below.

How to reporduce*
Dispatch an Event with the deprecated dispatch(Event $event) signature, when your are in a dev env.

Possible Solution
The \Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy should probably implement the EventDispatcherInterface from the EventDispatcher Bundle as it already implements all additional functions described by the EventDispatcherInterface from the EventDispatcher Bundle compared to the interface from the Contracts Bundle.

Additional context

PHP Fatal error:  Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Argument 3 passed to Symfony\Component\EventDispatcher\Debug\WrappedListener::__invoke() must implement interface Symfony\Component\EventDispatcher\EventDispatcherInterface, instance of Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy given, called in /app/vendor/symfony/event-dispatcher/LegacyEventDispatcherProxy.php on line 78 in /app/vendor/symfony/event-dispatcher/Debug/WrappedListener.php:113
        Stack trace:
        #0 /app/vendor/symfony/event-dispatcher/LegacyEventDispatcherProxy.php(78): Symfony\Component\EventDispatcher\Debug\WrappedListener->__invoke(Object(Symfony\Component\Console\Event\ConsoleErrorEvent), 'console.error', Object(Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy))
        #1 /app/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php(168): Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy->dispatch(Object(Symfony\Component\Console\Event\ConsoleErrorEvent), 'console.error')
        #2 /app/vendor/sym in /app/vendor/symfony/event-dispatcher/Debug/WrappedListener.php on line 113

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