python-libcst fails to build with Python 3.14.0a6. Check import: libcst.codegen.gen_matcher_classes Traceback (most recent call last): File "/usr/lib/rpm/redhat/import_all_modules.py", line 171, in <module> main() ~~~~^^ File "/usr/lib/rpm/redhat/import_all_modules.py", line 167, in main import_modules(modules) ~~~~~~~~~~~~~~^^^^^^^^^ File "/usr/lib/rpm/redhat/import_all_modules.py", line 100, in import_modules importlib.import_module(module) ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^ File "/usr/lib64/python3.14/importlib/__init__.py", line 88, in import_module return _bootstrap._gcd_import(name[level:], package, level) ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "<frozen importlib._bootstrap>", line 1395, in _gcd_import File "<frozen importlib._bootstrap>", line 1368, in _find_and_load File "<frozen importlib._bootstrap>", line 1339, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 935, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 762, in exec_module File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed File "/builddir/build/BUILD/python-libcst-1.7.0-build/BUILDROOT/usr/lib64/python3.14/site-packages/libcst/codegen/gen_matcher_classes.py", line 521, in <module> node_fields = list(_get_fields(node)) File "/builddir/build/BUILD/python-libcst-1.7.0-build/BUILDROOT/usr/lib64/python3.14/site-packages/libcst/codegen/gen_matcher_classes.py", line 425, in _get_fields fieldtype, aliases = _get_clean_type_and_aliases(field.type) ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/builddir/build/BUILD/python-libcst-1.7.0-build/BUILDROOT/usr/lib64/python3.14/site-packages/libcst/codegen/gen_matcher_classes.py", line 400, in _get_clean_type_and_aliases raise Exception("Logic error, unexpected top level type!") Exception: Logic error, unexpected top level type! https://docs.python.org/3.14/whatsnew/3.14.html For the build logs, see: https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08837364-python-libcst/ For all our attempts to build python-libcst with Python 3.14, see: https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/python-libcst/ Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.14: https://copr.fedorainfracloud.org/coprs/g/python/python3.14/ Let us know here if you have any questions. Python 3.14 is planned to be included in Fedora 43. To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14. A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon. We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.
https://src.fedoraproject.org/rpms/python-libcst/pull-request/9
$ python3 Python 3.14.0b2 (main, May 26 2025, 00:00:00) [GCC 15.1.1 20250521 (Red Hat 15.1.1-2)] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import libcst.codegen.gen_matcher_classes Traceback (most recent call last): File "<python-input-0>", line 1, in <module> import libcst.codegen.gen_matcher_classes File "/usr/lib64/python3.14/site-packages/libcst/codegen/gen_matcher_classes.py", line 521, in <module> node_fields = list(_get_fields(node)) File "/usr/lib64/python3.14/site-packages/libcst/codegen/gen_matcher_classes.py", line 425, in _get_fields fieldtype, aliases = _get_clean_type_and_aliases(field.type) ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/usr/lib64/python3.14/site-packages/libcst/codegen/gen_matcher_classes.py", line 400, in _get_clean_type_and_aliases raise Exception("Logic error, unexpected top level type!") Exception: Logic error, unexpected top level type!