Mirror `PoisonError` from the standard library?

Loom already [mirrors](https://docs.rs/loom/latest/loom/sync/index.html) some types of the standard library, such as [`LockResult`](https://doc.rust-lang.org/nightly/std/sync/poison/type.LockResult.html). It would be nice to also mirror the related [`PoisonError`](https://doc.rust-lang.org/std/sync/struct.PoisonError.html).