Incompatible type "Type[ImportError]"; expected "Type[Exception]"

[PeterJCLaw-mns]

Bug Report

Mypy appears not to consider ImportError to be an exception type in some cases.

To Reproduce

y = [
    # ValueError,
    ImportError,  # error: List item 0 has incompatible type "Type[ImportError]"; expected "Type[Exception]"  [list-item]
    AttributeError,
]
reveal_type(y)  # note: Revealed type is "builtins.list[def (*args: builtins.object, *, name: Union[builtins.str, None] =, obj: Union[builtins.str, None] =) -> builtins.Exception]"

The ordering of the list elements doesn't seem to impact the behaviour.

If you un-comment the ValueError however:

y = [
    ValueError,
    ImportError,
    AttributeError,
]
reveal_type(y)  # note: Revealed type is "builtins.list[builtins.type]"

While this is perhaps less precise than I'd hope (I'd hop to get list[type[Exception]]) it feels more right to me.

Adding an annotation to the variable (y: list[type[Exception]]) does help mypy see that this is ok, however in my original use-case the list being constructed was passed to a decorator function, so there was no easy opportunity to annotate it.

Your Environment

• Mypy version used: 0.991
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.11

[JelleZijlstra]

That's pretty weird! I am not sure it's specific to ImportError; I also get an error for y = [AttributeError, ImportError].