> box_ref.tag.store(COLLECTING_TAG.load(Ordering::Release))

Is it just me or do release semantics not make sense for a load? Release is for stores (I'm coming from the C/C++ atomics model). Hm, the docs[1] say a Release load will panic:

> Panics if order is Release or AcqRel.

Maybe just a blog transcription typo for tag.store(TAG.load(Relaxed), Release).

[1]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize...