[issue39871] math.copysign raises SystemError with non-float x and custom y

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +easy (C)
stage:  -> needs patch
versions: +Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39871>
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