[ty] display variance on hover over type variables#20900
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MichaReiser merged 7 commits intoastral-sh:mainfrom Oct 20, 2025
Merged
[ty] display variance on hover over type variables#20900MichaReiser merged 7 commits intoastral-sh:mainfrom
MichaReiser merged 7 commits intoastral-sh:mainfrom
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Diagnostic diff on typing conformance testsNo changes detected when running ty on typing conformance tests ✅ |
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@mtshiba, unfortunately, there are now some merge conflicts. |
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## Summary Derived from #20900 Implement `VarianceInferable` for `KnownInstanceType` (especially for `KnownInstanceType::TypeAliasType`). The variance of a type alias matches its value type. In normal usage, type aliases are expanded to value types, so the variance of a type alias can be obtained without implementing this. However, for example, if we want to display the variance when hovering over a type alias, we need to be able to obtain the variance of the type alias itself (cf. #20900). ## Test Plan I couldn't come up with a way to test this in mdtest, so I'm testing it in a test submodule at the end of `types.rs`. I also added a test to `mdtest/generics/pep695/variance.md`, but it passes without the changes in this PR.
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Divergence suppression for recursive aliases is addressed in #20969. Please check it out. |
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This reverts commit 2dc528c.
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Summary
Edit: please merge #20924 first
Closes astral-sh/ty#1348
The variance of a type variable is displayed (next to the type) when hovered over.
They are also displayed in the type parameters list.
This is an enhancement to the language server, but also includes some internal additions to
ty_python_semantic(such as calculating variances for type aliases).Test Plan
New tests in
ty_ide/hover/tests.