Matthias\SymfonyServiceDefinitionValidator\ArgumentValidator::validateReferenceArgument PHP Метод

    private function validateReferenceArgument($className, Reference $reference)
    {
        // the __toString method of a Reference is the referenced service id
        $referencedServiceId = (string) $reference;
        $definition = $this->containerBuilder->findDefinition($referencedServiceId);
        // we don't have to check if the definition exists, since the ContainerBuilder itself does that already
        $this->validateDefinitionArgument($className, $definition);
    }