Message port close events channel after all the sender routines exited
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When the context of the `Listen()` being canceled. There is a race condition that the goroutine that closes the `events` channel runs prior than the other handler goroutines (for both `message`/`messageerror`). If this happens, those handler goroutines will panic as the `events` channel is closed, and sending to a closed channel just panics in Go.
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When the context of the
Listen()being canceled. There is a race condition that the goroutine that closes theeventschannel runs prior than the other handler goroutines (for bothmessage/messageerror). If this happens, those handler goroutines will panic as theeventschannel is closed, and sending to a closed channel just panics in Go.