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Python’s loop scoping is misdesigned, resulting in a very common gotcha for functions that close over loop variables [1]. The general problem is so bad that even the Go developers plan to break compatibility in order to fix the same design mistake in their language [2]. Enable the Ruff rule function-uses-loop-variable (B023) [3], which conservatively prohibits functions from binding loop variables at all. [1] https://docs.python-guide.org/writing/gotchas/#late-binding-closures [2] https://go.dev/s/loopvar-design [3] https://beta.ruff.rs/docs/rules/function-uses-loop-variable/ Signed-off-by: Anders Kaseorg <anders@zulip.com>