Function claim 

pub async fn claim<S: Storage + ?Sized>(
    storage: &S,
    now: WallTime,
) -> Result<Claim>

Claim the writer’s lock on storage’s container — what Storage::claim does for a storage with no lock of its own.

A lock entry whose process is gone is stale — a writer that died without releasing it — and is broken rather than left to make the container unopenable forever. So is one that does not parse: it names nobody, and a container cannot be held hostage by a corrupt byte.

Errors

Failure to write the lock entry.