Yeah, that's why I talk about stealing it at the language level. Although it's possible to use this based on conventions, the real power comes from being able to use it to cover weird conditions while gluing various libraries together. If your language already has a relatively similar tool (i.e. "traditional" exceptions) there's basically no chance that anything you pick up will support conditions.

That said, it's a wonderful model to know about/follow if you come into the rare case that makes reimplementing it where you can useful.