[issue47128] Enhance Argument Clinic's NoneType return converter to give `void`

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

The function should return different values for success and error. Functions which do not do this have bad design.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47128>
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