Error-on-close is basically another form of error-on-destruct, and like you say it doesn't make much sense to raise an error about something that no longer exis

Error-on-close is basically another form of error-on-destruct, and like you say it doesn't make much sense to raise an error about something that no longer exists. It's not RAII that's wrong here, but the messy semantics of close() and its use as an ad-hoc asynchronous error reporting mechanism.