[ty] Use key and value parameter types as type context for __setitem__ dunder calls#22148
Merged
ibraheemdev merged 3 commits intomainfrom Jan 12, 2026
Merged
[ty] Use key and value parameter types as type context for __setitem__ dunder calls#22148ibraheemdev merged 3 commits intomainfrom
__setitem__ dunder calls#22148ibraheemdev merged 3 commits intomainfrom
Conversation
Diagnostic diff on typing conformance testsNo changes detected when running ty on typing conformance tests ✅ |
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| Lint rule | Added | Removed | Changed |
|---|---|---|---|
invalid-assignment |
0 | 28 | 9 |
invalid-argument-type |
1 | 12 | 3 |
invalid-await |
2 | 0 | 6 |
invalid-return-type |
0 | 0 | 6 |
possibly-missing-attribute |
3 | 0 | 1 |
unresolved-attribute |
0 | 0 | 2 |
not-subscriptable |
0 | 1 | 0 |
unused-ignore-comment |
0 | 1 | 0 |
| Total | 6 | 42 | 27 |
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MichaReiser
reviewed
Dec 30, 2025
MichaReiser
reviewed
Dec 30, 2025
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carljm
approved these changes
Jan 12, 2026
Comment on lines
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| let ast_arguments = [ | ||
| ArgOrKeyword::Arg(&target.slice), | ||
| ArgOrKeyword::Arg(rhs_value_node), | ||
| ]; | ||
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| let mut call_arguments = | ||
| CallArguments::positional([Type::unknown(), Type::unknown()]); | ||
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| let mut infer_argument_ty = | ||
| |builder: &mut Self, (argument_index, _, tcx): ArgExpr<'db, '_>| { | ||
| match argument_index { | ||
| 0 => infer_slice_ty(builder, tcx), | ||
| 1 => infer_rhs_value(builder, tcx), | ||
| _ => unreachable!(), | ||
| } | ||
| }; | ||
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| let Err(call_dunder_err) = self.infer_and_try_call_dunder( |
Contributor
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I think the ergonomics of argument handling for self.infer_and_try_call_dunder could probably be better? But we can defer that to once we have >1 use of it.
Member
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Yeah, it's just a little bit tricky because the underlying method infer_all_argument_types is meant to work with variadic AST arguments, while this case requires a custom inference method per argument. Open to suggestions.
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Summary
Resolves astral-sh/ty#2136.