Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

When function sets an exception, it should return NULL. Otherwise the behavior 
of the interpreter is undefined, it can crash in debug build or developing mode.

See for example 
https://docs.python.org/3/extending/extending.html#intermezzo-errors-and-exceptions

----------
nosy: +serhiy.storchaka
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue17544>
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