Add new rule RUF059: Unused unpacked assignment #16449
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Split from F841 following discussion in astral-sh#8884. Fixes astral-sh#8884.
JelleZijlstra
commented
Mar 1, 2025
| @@ -48,6 +48,7 @@ pub(crate) fn deferred_scopes(checker: &Checker) { | |||
| Rule::UnusedPrivateTypedDict, | |||
| Rule::UnusedPrivateTypeVar, | |||
| Rule::UnusedStaticMethodArgument, | |||
| Rule::UnusedUnpackedVariable, | |||
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feedback/rant: took me forever to figure out that missing this line was why my tests weren't producing any lints. It makes sense in retrospect and I don't have a better idea for how to do it, but it was a bit frustrating.
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Sorry for that. Yeah, not sure what a good short-term fix for this is. My plan for Red Knot is to remove those manual checks entirely and instead have a more "formal" rule API that allows pre-computing in which phase a rule must run. This will hopefully help prevent such surprises
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| code | total | + violation | - violation | + fix | - fix |
|---|---|---|---|---|---|
| F841 | 1091 | 0 | 1091 | 0 | 0 |
| RUF059 | 831 | 831 | 0 | 0 | 0 |
| PLR0914 | 2 | 1 | 1 | 0 | 0 |
| DOC201 | 2 | 1 | 1 | 0 | 0 |
MichaReiser
added
preview
MichaReiser
approved these changes
Mar 3, 2025
Comment on lines
19
to
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| /// Under [preview mode](https://docs.astral.sh/ruff/preview), this rule also | ||
| /// triggers on unused unpacked assignments (for example, `x, y = foo()`). | ||
| /// |
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Suggested change
| /// Under [preview mode](https://docs.astral.sh/ruff/preview), this rule also | |
| /// triggers on unused unpacked assignments (for example, `x, y = foo()`). | |
| /// |
| @@ -48,6 +48,7 @@ pub(crate) fn deferred_scopes(checker: &Checker) { | |||
| Rule::UnusedPrivateTypedDict, | |||
| Rule::UnusedPrivateTypeVar, | |||
| Rule::UnusedStaticMethodArgument, | |||
| Rule::UnusedUnpackedVariable, | |||
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Sorry for that. Yeah, not sure what a good short-term fix for this is. My plan for Red Knot is to remove those manual checks entirely and instead have a more "formal" rule API that allows pre-computing in which phase a rule must run. This will hopefully help prevent such surprises
MichaReiser
reviewed
Mar 3, 2025
Comment on lines
86
to
100
| for (name, binding) in scope | ||
| .bindings() | ||
| .map(|(name, binding_id)| (name, checker.semantic().binding(binding_id))) | ||
| .filter_map(|(name, binding)| { | ||
| if checker.settings.preview.is_enabled() | ||
| && binding.is_unpacked_assignment() | ||
| && binding.is_unused() | ||
| && !binding.is_nonlocal() | ||
| && !binding.is_global() | ||
| && !checker.settings.dummy_variable_rgx.is_match(name) | ||
| { | ||
| return Some((name, binding)); | ||
| } | ||
|
|
||
| None |
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It's a bit unfortunate that this repeats the entire check from F841 with only the unpack assignment being different. Let me see if we can make this more obvious
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Thanks for the review and merge! |
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Split from F841 following discussion in #8884.
Fixes #8884.
Summary
Add a new rule for unused assignments in tuples. Remove similar behavior from F841.
Test Plan
Adapt F841 tests and move them over to the new rule.