[issue37138] PEP 590 method_vectorcall calls memcpy with NULL src

[Jeroen Demeyer]

Change by Jeroen Demeyer <J.Demeyer at UGent.be>:


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keywords: +patch
pull_requests: +13743
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/13867

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<https://bugs.python.org/issue37138>
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