[issue38368] Crash when subclassing ctypes.Union

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Also crashes on Windows (x64 and x86), and on 3.7.5rc1, so this is likely in our code.

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nosy: +ned.deily, steve.dower
priority: normal -> release blocker
stage:  -> test needed
versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38368>
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