[issue32711] Fix warnings for Python/ast_unparse.c

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

Hi Christian,

I add Lukasz in the loop because Victor asked to him a small review because he is not sure about the right way, PyErr_XXX or Py_UNREACHABLE.

Thank you for your review.

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nosy: +lukasz.langa

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<https://bugs.python.org/issue32711>
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