More helpful diagnostic when trying to use PEP 604 union types before 3.10 #437
Description
Summary
I believe this is distinct from #122 because even the most basic UnionType seems to fail.
# test.py
from typing import Union
A = Union[int, str]
B = int | str$ uvx ty check test.py
error[unsupported-operator]: Operator `|` is unsupported between objects of type `<class 'int'>` and `<class 'str'>`
--> test.py:4:5
|
3 | A = Union[int, str]
4 | B = int | str
| ^^^^^^^^^
|
info: rule `unsupported-operator` is enabled by defaultVersion
ty 0.0.1-alpha.5 and ty 0.0.1-alpha.5 (4ad13f2 2025-05-17)