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## Summary Support recursive type aliases by adding a `Type::TypeAlias` type variant, which allows referring to a type alias directly as a type without eagerly unpacking it to its value. We still unpack type aliases when they are added to intersections and unions, so that we can simplify the intersection/union appropriately based on the unpacked value of the type alias. This introduces new possible recursive types, and so also requires expanding our usage of recursion-detecting visitors in Type methods. The use of these visitors is still not fully comprehensive in this PR, and will require further expansion to support recursion in more kinds of types (I already have further work on this locally), but I think it may be better to do this incrementally in multiple PRs. ## Test Plan Added some recursive type-alias tests and made them pass. |
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| .. | ||
| corpus | ||
| mdtest | ||
| primer | ||
| 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.