ServiceSubscriberTrait

Start with src/Service/MyService.php and the phpstan.neon configuration using containerXmlPath, then run PHPStan against the reproduced ServiceSubscriberTrait example. Trace how the generated container XML represents the #[SubscribedService] methods; done means valid router and logger services are recognized without false "not registered" errors.

I have an issue with ServiceSubscriberTrait (https://symfony.com/doc/5.4/service_container/service_subscribers_locators.html#service-subscriber-trait) on symfony 5.4 and PHP 7.4. Error message is like Service "App\Service\MyService::router" is not registered in the container.

How to reproduce:

1. Install this extesion
2. Add config as described in https://github.com/phpstan/phpstan-symfony#configuration

// phpstan.neon
    symfony:
        containerXmlPath: var/cache/dev/App_KernelDevDebugContainer.xml

3. Create class MyService and copy code from symfony docs.

// src/Service/MyService.php
<?php

declare(strict_types=1);

namespace App\Service;

use Psr\Log\LoggerInterface;
use Symfony\Component\Routing\RouterInterface;
use Symfony\Contracts\Service\Attribute\SubscribedService;
use Symfony\Contracts\Service\ServiceSubscriberInterface;
use Symfony\Contracts\Service\ServiceSubscriberTrait;

class MyService implements ServiceSubscriberInterface
{
    use ServiceSubscriberTrait;

    public function doSomething()
    {
        // $this->router() ...
        // $this->logger() ...
    }

    #[SubscribedService]
    private function router(): RouterInterface
    {
        return $this->container->get(__METHOD__);
    }

    #[SubscribedService]
    private function logger(): LoggerInterface
    {
        return $this->container->get(__METHOD__);
    }
}

4. Run phpstan

The output will be:

 ------ ------------------------------------------------------------------
  Line   src/Service/MyService.php
 ------ ------------------------------------------------------------------
  17     Method App\Service\MyService::doSomething() has no return type
         specified.
  24     Method App\Service\MyService::router() is unused.
  26     Service "App\Service\MyService::router" is not registered in the
         container.
  30     Method App\Service\MyService::logger() is unused.
  32     Service "App\Service\MyService::logger" is not registered in the
         container.
 ------ ------------------------------------------------------------------