[ServiceContainer] Php example does not work

[Fan2Shrek]

Hello,

Regarding the documentation example:
https://symfony.com/doc/current/service_container.html#binding-arguments-by-name-or-type

The following configuration example does not appear to work:

return App::config([
    'services' => [
        '_defaults' => [
            'bind' => [
                'iterable $rules' => tagged_iterator('app.foo.rule'),
            ],
        ],
    ],
]);

According to the documentation, this should inject all services tagged with app.foo.rule into the $rules iterable.

However, it throws the following error:

Am I missing something in the configuration, or is the documentation example incorrect?

Thanks.