Wrap all of `x.py` in `if name == 'main':` to avoid problems with `multiprocessing`#111049

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Zalathar wants to merge 1 commit intorust-lang:masterfrom

Commits on May 1, 2023

Wrap all of `x.py` in `if __name__ == '__main__':` to avoid problems with `multiprocessing`
Zalathar
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