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[red-knot] Understand type[Unknown] (#15409)

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## Summary

Follow-up to #15194.

## Test Plan

Markdown tests.
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9
crates/red_knot_python_semantic/resources/mdtest/directives/assert_type.md
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@ -66,14 +66,11 @@ def _(a: Unknown, b: Any):
assert_type(b, Unknown) # fine assert_type(b, Unknown) # fine
def _(a: type[Unknown], b: type[Any]): def _(a: type[Unknown], b: type[Any]):
# TODO: Should be `type[Unknown]` reveal_type(a) # revealed: type[Unknown]
reveal_type(a) # revealed: @Todo(unsupported type[X] special form) assert_type(a, type[Any]) # fine
# TODO: Should be fine
assert_type(a, type[Any]) # error: [type-assertion-failure]
reveal_type(b) # revealed: type[Any] reveal_type(b) # revealed: type[Any]
# TODO: Should be fine assert_type(b, type[Unknown]) # fine
assert_type(b, type[Unknown]) # error: [type-assertion-failure]
``` ```
## Tuples ## Tuples

3
crates/red_knot_python_semantic/src/types/infer.rs
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@ -5066,6 +5066,9 @@ impl<'db> TypeInferenceBuilder<'db> {
Type::KnownInstance(KnownInstanceType::Any) => { Type::KnownInstance(KnownInstanceType::Any) => {
SubclassOfType::subclass_of_any() SubclassOfType::subclass_of_any()
} }
Type::KnownInstance(KnownInstanceType::Unknown) => {
SubclassOfType::subclass_of_unknown()
}
_ => todo_type!("unsupported type[X] special form"), _ => todo_type!("unsupported type[X] special form"),
} }
} }