Overlapping unions creates issues with inference #7579

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yilinwei opened this issue Sep 28, 2019 · 1 comment

yilinwei commented Sep 28, 2019

version: 7.3.0

When creating a union which has overlapping types, the inference fails. Either this should throw an error, or it should be inferred correctly.

from typing import TypeVar, Union, Iterable, List

T = TypeVar("T")

def foo(test: Union[T, List[T]]):
    pass

foo([1]) # Fails with incompatible type List[<nothing>]

Example of misuse here

Member

ilevkivskyi commented Sep 28, 2019

Duplicate of #6417

ilevkivskyi marked this as a duplicate of #6417

ilevkivskyi closed this as completed

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