| class OldIterable(Sized, Protocol[T]): | |
| def __getitem__(self, item: int) -> T: ... | |
| CompatIterable = Union[Iterable[T], OldIterable[T]] | |
| class A: | |
| def __iter__(self) -> Iterator[str]: ... | |
| class B: | |
| def __len__(self) -> int: ... | |
| def __getitem__(self, item: int) -> str: ... | |
| def iterate(it: CompatIterable[str]) -> None: | |
| ... | |
| iterate(A()) # OK | |
| iterate(B()) # OK | |