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[ty] type[…] is always assignable to type (#18121)

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## Summary

Model that `type[C]` is always assignable to `type`, even if `C` is not
fully static.

closes https://github.com/astral-sh/ty/issues/312

## Test Plan

* New Markdown tests
* Property tests
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David Peter 2025-05-15 17:13:47 +02:00 • committed by GitHub
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6
crates/ty_python_semantic/resources/mdtest/type_properties/is_assignable_to.md
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@ -196,6 +196,12 @@ static_assert(is_assignable_to(type[Any], Meta))
static_assert(is_assignable_to(type[Unknown], Meta)) static_assert(is_assignable_to(type[Unknown], Meta))
static_assert(is_assignable_to(Meta, type[Any])) static_assert(is_assignable_to(Meta, type[Any]))
static_assert(is_assignable_to(Meta, type[Unknown])) static_assert(is_assignable_to(Meta, type[Unknown]))
class AnyMeta(metaclass=Any): ...
static_assert(is_assignable_to(type[AnyMeta], type))
static_assert(is_assignable_to(type[AnyMeta], type[object]))
static_assert(is_assignable_to(type[AnyMeta], type[Any]))
``` ```
## Heterogeneous tuple types ## Heterogeneous tuple types

9
crates/ty_python_semantic/src/types.rs
View file

@ -1516,6 +1516,15 @@ impl<'db> Type<'db> {
true true
} }
// Every `type[...]` is assignable to `type`
(Type::SubclassOf(_), _)
if KnownClass::Type
.to_instance(db)
.is_assignable_to(db, target) =>
{
true
}
// All `type[...]` types are assignable to `type[Any]`, because `type[Any]` can // All `type[...]` types are assignable to `type[Any]`, because `type[Any]` can
// materialize to any `type[...]` type. // materialize to any `type[...]` type.
// //