The Console\Application::setDispatcher() method added in PR #7466 references EventDispatcherInterface as a type hint, however symfony/event-dispatcher is not listed as a runtime Composer dependency.

This has caused a BC breakage when using reflection on the console Application class, in the form of the following exception:

ReflectionException: Class Symfony\Component\EventDispatcher\EventDispatcherInterface does not exist

I'm not sure how this should be fixed, two possible solutions come to mind:

• Promote symfony/event-dispatcher from require-dev to require
• Do not use a type-hint on Application::setDispatcher()

As a workaround we've manually added symfony/event-dispatcher to our project's composer.json, but this does not feel like a good solution as our app does not use the event features at all.