`Iterator[int]` not recognised as `Hashable`

Bug Report

Iterator[int] is not recognised as Hashable.

To Reproduce

• https://play.ty.dev/13380319-febd-421a-9540-ce987c4bbc9c
• https://pyrefly.org/sandbox/?project=v2.lVVBboMwEPzKqjlgWoJL1RMPqHrs3eWAUgSWmoCwqZJD_95Zg8GoSZRckGV21-uZ2fEdlvnoBcqlxTEH_NbrZdLKkZ4o47DAk4QLf32JQcp_zDb0MW7QdDzcAmDXAzwJIKafhw3sqKLG2s7kUvr0tq9ldZBf7c7IVYYklkf5U2rndOty1DqODcqeJyu7iaxo5Cq6RlXETCFirw0Grd6aoav67Q4iwk8LWQKLBXHtIb9g3Mvz8V6ahi-2-Bmb4FuP0Vk5mqksTwJMbe1bCaHNnOwAC1TmW4c1i9n7_HkKHAMHTl5mmdIUADIz-1N3IlwCShmHJqGJILeLta4b9nOetLlPEadhf8J1Ibg0HtL5Gyc83L1Qz0WMtcoKCCioofIgoACoiIDCLotdP_z-AQ
• https://pyright-play.net/?code=GYJw9gtgBAxmA28CmMAuBLMA7AzgOgEMAjGKdCABzBFSgGUkBHAVySxiQBooAJAnABbFkAKBEx4-HFAAiBVAQBiIAhCQAuEVG1QAJkmBQA%2BkZxIMqJBBMAKLTodn4wbgGskAT3VRUzCsgBtHHh0Dm4%2BQWEkAF1uADcCeFZvBhY2DgD0LFRo%2B20ASigAWgA%2BKAA5bA0oPFqxAGIoCA8KDygCLF0fNqQQcBBuVpADeDaOrqH0AHMBWgopETkFZVUkG3y8EzMLK1sbYNC1yqwuCqruY6R87nRLEBsAgAZo-OuoAIBGF8X5JRU1dYBdQ3O4PZ75aJQAC87y%2BIiAA
• https://mypy-play.net/?gist=71aba787eb6f23212e1fd4e0a63cf86f

from collections.abc import Sequence, Hashable

class DataFrame:
    def __setitem__(
        self, key: tuple[slice, Hashable], value: Sequence[int]
    ) -> None: ...

# mypy and ty error, pyrefly and pyright pass
DataFrame().__setitem__((slice(None, None, None), iter([0])), [1])
DataFrame()[:, iter([0])] = [1]

Expected Behavior

error free

Actual Behavior

main.py:9: error: Invalid index type "tuple[slice[Any, Any, Any], Iterator[int]]" for "DataFrame"; expected type "tuple[slice[Any, Any, Any], Hashable]"  [index]
main.py:10: error: Invalid index type "tuple[slice[None, None, None], Iterator[int]]" for "DataFrame"; expected type "tuple[slice[Any, Any, Any], Hashable]"  [index]
Found 2 errors in 1 file (checked 1 source file)

Your Environment

Playground

Start with the main.py reproducer in the linked mypy playground and run mypy to confirm the invalid index type diagnostic. Trace how Iterator[int] is checked against Hashable, then verify the reproducer is error-free while preserving the expected tuple index types.