[issue40204] Docs build error with Sphinx 3.0 due to invalid C declaration

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

This issue prevents to upgrade Sphinx to Sphinx 3 in Fedora Rawhide, at least it breaks the python3-docs package which is Python 3.9 documentation:
https://bugzilla.redhat.com/show_bug.cgi?id=1823898

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40204>
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