[red-knot] Fallback for typing._NoDefaultType#14783
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`typing_extensions` has a `>=3.13` re-export for the `typing.NoDefault` singleton, but not for `typing._NoDefaultType`. This causes problems as soon as we understand `sys.version_info` branches, so we explicity switch to `typing._NoDefaultType` for Python 3.13 and later.
MichaReiser
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Dec 5, 2024
Co-authored-by: Micha Reiser <micha@reiser.io>
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I'm merging this to decrease the diff in the statically-known branches PR. It seems relatively uncontroversial, but please let me know if something is off. |
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Summary
typing_extensionshas a>=3.13re-export for thetyping.NoDefaultsingleton, but not fortyping._NoDefaultType. This causes problems as soon as we understandsys.version_infobranches, so we explicity switch totyping._NoDefaultTypefor Python 3.13 and later.This is a part of #14759 that I thought might make sense to break out and merge in isolation.
Test Plan
New test that will become more meaningful with #12700