I think you're missing the point: you need to solve the halting problem if you expect to get prompt notification of asynchronous exceptions. This can't be solved at a language level. The only solution is to expose the pending unhandled exceptions to programmers so that they can use their human judgment to determine when the exception has been pending "long enough" that it's actually an error. (And this isn't a new issue, or specific to promises or await/async.)
GC of an promise tells you that some async exceptions can no longer be handled, but that's only part of the iceberg. Promises can also be kept live indefinitely with unhandled exceptions. That's not necessarily an error -- perhaps a handler will eventually be added. Like I said, you need to solve the halting problem if you want to definitely identified unhandled asynchronous exceptions. The best solution is to expose the pending exceptions to the human, and let them decide. Please go back and reread the extensive discussions we've had on this topic previously on this mailing list. I'm writing from my phone, but perhaps someone better connected can give you a few URLs. --scott
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