Getting TranslationLoader deprecation when container.dumper.inline_class_loader is set to true

[ogizanagi]

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	no
RFC?	no
Symfony version	3.4.0-BETA4

Steps to reproduce:

1. symfony new reproducer 3.4 && cd reproducer
2. Uncomment the translator: { fallbacks: ['%locale%'] } line in app/config/config.yml
3. composer up
4. bin/console c:c -vvv

You'll get the following deprecation logged:

INFO      [php] User Deprecated: The class "Symfony\Bundle\FrameworkBundle\Translation\TranslationLoader" is deprecated since version 3.4 and will be removed in 4.0. Use "Symfony\Component\Translation\Reader\TranslationReader" instead. 
[
  "exception" => ErrorException {
    #message: "User Deprecated: The class "Symfony\Bundle\FrameworkBundle\Translation\TranslationLoader" is deprecated since version 3.4 and will be removed in 4.0. Use "Symfony\Component\Translation\Reader\TranslationReader" instead. "
    #code: 0
    #file: "./vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Translation/TranslationLoader.php"
    #line: 17
    #severity: E_USER_DEPRECATED
    trace: {
      ./vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Translation/TranslationLoader.php:17 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/Debug/DebugClassLoader.php:143 { …}
      Symfony\Component\Debug\DebugClassLoader->loadClass() {}
      spl_autoload_call() {}
      ./vendor/symfony/symfony/src/Symfony/Component/Config/Resource/ClassExistenceResource.php:78 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/ContainerBuilder.php:351 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:344 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:279 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:799 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:851 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:190 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php:816 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php:634 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php:137 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php:154 { …}
      ./vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php:180 { …}
      ./vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php:161 { …}
      ./vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php:117 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/Console/Command/Command.php:252 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:942 { …}
      ./vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Console/Application.php:83 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:225 { …}
      ./vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Console/Application.php:71 { …}
      ./vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:129 { …}
      ./bin/console:27 {
        › $application = new Application($kernel);
        › $application->run($input);
        › 
      }
    }
  }
]

It seems the ContainerBuilder::getReflectionClass() method is called with the TranslationLoader as $class argument when collecting lineages, triggering autoloading and the deprecation through ClassExistenceResource::isFresh().

It does not happen when setting container.dumper.inline_class_loader to false.

[nicolas-grekas]

See #25037