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Fix F401 infinite loop when adding duplicate symbols to __all__ - #23052
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Adds dedup() call after sorting imports in fix_by_reexporting to prevent infinite loops when the same symbol appears multiple times due to star imports combined with explicit imports. Without deduplication, ruff would repeatedly add the same symbol to __all__, creating an infinite fix loop. Fixes astral-sh#22221
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Thanks for your interest in contributing to Ruff! Unfortunately this does not seem to fix the linked issue: ❯ gh pr checkout 23052
❯ mkdir foo && echo 'import foo.bar.module
import foo.baz.module
__all__ = ["foo"]' > foo/__init__.py
❯ cargo run -p ruff -- check --no-cache --isolated --select F401 --preview foo/__init__.py
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
Running `target/debug/ruff check --no-cache --isolated --select F401 --preview foo/__init__.py`
F401 [*] `foo.baz.module` imported but unused; consider removing, adding to `__all__`, or using a redundant alias
--> foo/__init__.py:2:8
|
1 | import foo.bar.module
2 | import foo.baz.module
| ^^^^^^^^^^^^^^
3 |
4 | __all__ = ["foo"]
|
help: Add `foo` to __all__
1 | import foo.bar.module
2 | import foo.baz.module
3 |
- __all__ = ["foo"]
4 + __all__ = ["foo", "foo"]
Found 1 error.
[*] 1 fixable with the `--fix` option.Moreover, even if it did, we need to do more than just change the autofix - the help text is also incorrect in this situation. So I think we need something closer to what I started working on in this draft #23038 Finally, I'm not sure I understand the test case you tried. The autofix would add |
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Summary
Fixes #22221
Running
ruff check --fixcould enter an infinite loop when fixing F401 (unused imports) in__init__.pyfiles that combine star imports with explicit imports of the same symbol.Problem
When adding symbols to
__all__infix_by_reexporting, duplicate symbols could be collected (e.g., when a module has bothfrom foo import *andfrom foo import bar). Without deduplication, ruff would repeatedly add the same symbol to__all__, creating an infinite fix loop.Changes
Added a
dedup()call aftersort_unstable()infix_by_reexportingto remove duplicate symbols before adding them to__all__.Test Plan
Tested with:
Before this fix,
ruff check --fix --unsafe-fixeswould loop infinitely. After this fix, it correctly adds each symbol once.