// We want to test that `nosy::sync` and `nosy::unsync` are equally usable — that there are no
// differences in declaration that cause one to be able to do something the other cannot,
// other than their fundamental `Send + Sync` difference.
// In order to do that, we write tests that are compiled once for each flavor.
// TODO: Ideally, we would test the "spin-sync" version but it has partial item availability
// that's tricky to cfg for.