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

Since contextlib._GeneratorContextManager is implemented in Python, it is 
unlikely that it is a culprit of the error. Do you use any third-party 
extensions? Likely some extension provoked the error.

Can you provide a minimal script that reproduces the issue?

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32799>
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