Preserve backtraces in fork_daemon and fork_promise_exn #779
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If the fiber fails, record the backtrace when failing the switch. `fork` itself already did this, but `fork_daemon` and `fork_promise_exn` didn't.
talex5
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If the fiber fails, record the backtrace when failing the switch.
forkitself already did this, butfork_daemonandfork_promise_exndidn't.This caused unhelpful errors such as: