Как в Symfony 3.4 сделать dependency inject для EventDispatcher

В конфигурации нужно использовать ссылку на сервис event_dispatcher:

new Reference('event_dispatcher')

Например:

$container->autowire('new_service', Service::class)
    ->addMethodCall('setEventDispatcher', new Reference('event_dispatcher'))
;

А в сервисе, требующим зависимость:

use Symfony\Component\EventDispatcher\EventDispatcherInterface;

public function setEventDispatcher(EventDispatcherInterface $EventDispatcher) {
    $this->EventDispatcher = $EventDispatcher;
}
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