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@amszmidt @ponies @simontatham
Speaking as someone who's been dealing with bash for a *very long time* in occasionally weird situations, I have to weigh in here: your particular use case is not common.
It's *your* use case, though, and it looks to me like you could save yourself a lot of trouble by simply getting in the habit of not editing bash scripts while you run them.

That's an interesting workaround you have come up with, though I don't know how you're planning to exit main with an error code to pass to $? without actually exiting the script.

I'm not meaning to pry much, but what on earth are you doing that does not benefit from a restart with correct code?