[issue18060] Updating _fields_ of a derived struct type yields a bad cif

[Jeffrey Kintscher]

Jeffrey Kintscher <websurfer at surf2c.net> added the comment:

It still behaves as described in the 3.7 and master branches. The proposed fix works. I will submit a pull request.

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nosy: +websurfer5
versions: +Python 3.7, Python 3.8

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<https://bugs.python.org/issue18060>
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