New submission from Zackery Spytz <zsp...@gmail.com>:

In is_typing_name(), va_end() is not always called before the function returns. 
 It is undefined behavior to call va_start() without also calling va_end().

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components: Interpreter Core
messages: 384261
nosy: ZackerySpytz
priority: normal
severity: normal
status: open
title: Undefined behavior in Objects/genericaliasobject.c
versions: Python 3.10

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42814>
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