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## Summary Fixes #3011. Type checkers currently allow forward references in all contexts in stub files, and stubs frequently make use of this capability (although it doesn't actually seem to be specc'd anywhere --neither in PEP 484, nor https://typing.readthedocs.io/en/latest/source/stubs.html#id6, nor the CPython typing docs). Implementing it so that Ruff allows forward references in _all contexts_ in stub files seems non-trivial, however (or at least, I couldn't figure out how to do it easily), so this PR does not do that. Perhaps it _should_; if we think this apporach isn't principled enough, I'm happy to close it and postpone changing anything here. However, this does reduce the number of F821 errors Ruff emits on typeshed down from 76 to 2, which would mean that we could enable the rule at typeshed. The remaining 2 F821 errors can be trivially fixed at typeshed by moving definitions around; forward references in class bases were really the only remaining places where there was a real _use case_ for forward references in stub files that Ruff wasn't yet allowing. ## Test plan `cargo test`. I also ran this PR branch on typeshed to check to see if there were any new false positives caused by the changes here; there were none. |
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