gh-117486: Improve behavior for user-defined AST subclasses #118212
Merged
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Now, such classes will no longer require changes in Python 3.13 in the normal case.
The test suite for robotframework passes with no DeprecationWarnings under this PR.
I also added a new DeprecationWarning for the case where
_field_types
existsbut is incomplete, since that seems likely to indicate a user mistake.
Closes #117486
📚 Documentation preview 📚: https://cpython-previews--118212.org.readthedocs.build/