Shunsuke Shibayama e4384fc212 [ty] impl VarianceInferable for KnownInstanceType (#20924) ... ## 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.		2025-10-17 21:12:19 +02:00
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aliases.md	[ty] Add support for generic PEP695 type aliases (#20219)	2025-09-08 13:26:21 -07:00
classes.md	[ty] Improve diagnostics for bad @overload definitions (#20745)	2025-10-07 21:52:57 +00:00
functions.md	[ty] bidirectional type inference using function return type annotations (#20528)	2025-10-11 00:38:35 +00:00
variables.md	[ty] Add mdtests that exercise constraint sets (#20319)	2025-09-10 13:22:19 -04:00
variance.md	[ty] impl VarianceInferable for KnownInstanceType (#20924)	2025-10-17 21:12:19 +02:00