[issue10849] Backport test/__main__

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

> The possible downside, as with any new feature, is that code using the
> new feature will not run on on previous micro (x.y.z) releases.

That's absolutely no downside: I daresay 99% of test runs by developers are done at the branch head, not some released version.

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nosy: +georg.brandl

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