F821, F822: fix false positive for .pyi
files; add more test coverage for .pyi
files
#10341
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Summary
This PR fixes the following false positive in a
.pyi
stub file:In a
.py
file, this is invalid regardless of whetherfrom __future__ import annotations
is enabled or not. In a.pyi
stub file, however, it's always valid, as an annotation counts as a binding in a stub file even if no value is assigned to the variable.I also added more test coverage for
.pyi
stub files in various edge cases where ruff's behaviour is currently correct, but where.pyi
stub files do slightly different things to.py
files. In the process of doing this, I discovered #10340.Test Plan
cargo test