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[red-knot] Add failing test for use of type[] as a base class (#14913)

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We support using `typing.Type[]` as a base class (and we have tests for
it), but not yet `builtins.type[]`. At some point we should fix that,
but I don't think it';s worth spending much time on now (and it might be
easier once we've implemented generics?). This PR just adds a failing
test with a TODO.
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Alex Waygood 2024-12-11 17:08:00 +00:00 • committed by GitHub
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crates/red_knot_python_semantic/resources/mdtest/type_of/basic.md
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@ -133,3 +133,14 @@ class B: ...
# error: [invalid-type-form]
_: type[A, B]
```
## As a base class
```py
# TODO: this is a false positive
# error: [invalid-base] "Invalid class base with type `GenericAlias` (all bases must be a class, `Any`, `Unknown` or `Todo`)"
class Foo(type[int]): ...
# TODO: should be `tuple[Literal[Foo], Literal[type], Literal[object]]
reveal_type(Foo.__mro__) # revealed: tuple[Literal[Foo], Unknown, Literal[object]]
```