[issue34616] implement "Async exec"

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> Could it be due to rebasing and force-pushing ? Cause I did force-push on this branch a couple of times...

Maybe you used "git merge" and your PR "contained" changes from other issues?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34616>
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