[issue20586] Argument Clinic: functions with valid sig but no docstring have no __text_signature__

[Roundup Robot]

Roundup Robot added the comment:

New changeset e75fd221a53e by Zachary Ware in branch 'default':
Issue #20586: Argument Clinic now ensures signatures on functions without docstrings.
https://hg.python.org/cpython/rev/e75fd221a53e

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nosy: +python-dev

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<http://bugs.python.org/issue20586>
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