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[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)

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Alex Waygood 2025-10-27 11:19:12 +00:00 • committed by GitHub
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6
crates/ty_python_semantic/resources/mdtest/loops/for.md
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@ -798,11 +798,11 @@ A class literal can be iterated over if it has `Any` or `Unknown` in its MRO, si
```py
from unresolved_module import SomethingUnknown # error: [unresolved-import]
from typing import Any, Iterable
from ty_extensions import static_assert, is_assignable_to, TypeOf, Unknown
from ty_extensions import static_assert, is_assignable_to, TypeOf, Unknown, reveal_mro
class Foo(SomethingUnknown): ...
reveal_type(Foo.__mro__) # revealed: tuple[<class 'Foo'>, Unknown, <class 'object'>]
reveal_mro(Foo) # revealed: (<class 'Foo'>, Unknown, <class 'object'>)
# TODO: these should pass
static_assert(is_assignable_to(TypeOf[Foo], Iterable[Unknown])) # error: [static-assert-error]
@ -815,7 +815,7 @@ for x in Foo:
class Bar(Any): ...
reveal_type(Bar.__mro__) # revealed: tuple[<class 'Bar'>, Any, <class 'object'>]
reveal_mro(Bar) # revealed: (<class 'Bar'>, Any, <class 'object'>)
# TODO: these should pass
static_assert(is_assignable_to(TypeOf[Bar], Iterable[Any])) # error: [static-assert-error]