[Symfony] Try to check private service existence from container

[Gnucki]

I was trying to migrate a bundle to enqueue 0.9 (from 0.8) in order to use symfony 4.2 messaging component instead of 4.1.

I did not changed my enqueue config:

enqueue:
    async_events:
        enabled: false
    transport:
        default: rabbitmq_amqp
        rabbitmq_amqp:
            dsn: '%env(BROKER_DSN)%'
    client: ~

But got this strange exception:

RuntimeException: Can't find Enqueue's transport named "default": Service "enqueue.transport.default.context" is not found.

Then, I tried to trace the exception. It is coming from messenger-adapter:

if (!$this->container->has($contextService = 'enqueue.transport.'.$enqueueContextName.'.context')) {

The problem is that context services are private so they are not accessible from container get method.

Am I missing something?
If not, I made a PR: #622

[makasim]

context has to be added to enqueue.locator just like here and the locator should be used in messenger adapter (instead of the whole container).

Services are public in the locator.

[Gnucki]

#623