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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
..
corpus [ty] fix deferred name loading in PEP695 generic classes/functions (#19888) 2025-08-13 15:51:59 -07:00
mdtest [ty] impl VarianceInferable for KnownInstanceType (#20924) 2025-10-17 21:12:19 +02:00
primer Fix run-away for mutually referential instance attributes (#20645) 2025-10-16 13:24:41 +02:00
README.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00

README.md

Markdown files within the mdtest/ subdirectory are tests of type inference and type checking; executed by the tests/mdtest.rs integration test.

See crates/ty_test/README.md for documentation of this test format.