def test_overlapping_schemas(restore_singletons: Any) -> None:  # noqa: F811
    @dataclass
    class Plugin:
        name: str = MISSING
        params: Dict[str, Any] = MISSING

    @dataclass
    class ConcretePlugin:
        name: str = "foobar_plugin"

        @dataclass
        class FoobarParams:
            foo: int = 10

        params: FoobarParams = FoobarParams()

    @dataclass
    class Config:
        plugin: Plugin = Plugin()

    cs = ConfigStore.instance()
    cs.store(name="config", node=Config)
    cs.store(group="plugin", name="concrete", node=ConcretePlugin, path="plugin")

    config_loader = ConfigLoaderImpl(config_search_path=create_config_search_path(None))
    cfg = config_loader.load_configuration(config_name="config", overrides=[])
    del cfg["hydra"]
    assert cfg == {"plugin": {"name": "???", "params": "???"}}
    assert cfg.plugin._type == Plugin

    cfg = config_loader.load_configuration(
        config_name="config", overrides=["plugin=concrete"]
    )
    del cfg["hydra"]
    assert cfg == {"plugin": {"name": "foobar_plugin", "params": {"foo": 10}}}
    assert cfg.plugin._type == ConcretePlugin
    assert cfg.plugin.params._type == ConcretePlugin.FoobarParams
    with pytest.raises(ValidationError):
        cfg.plugin = 10