8000 "Invalid type" error when creating a synonym for Optional[int] · Issue #1637 · python/mypy · GitHub
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"Invalid type" error when creating a synonym for Optional[int] #1637
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"Invalid type" error when creating a synonym for Optional[int]#1637
@rwbarton

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@rwbarton
rwbarton
opened on Jun 3, 2016
from typing import Optional
MyType = Optional[int]
def f(x: bool) -> MyType:
    pass

produces an error

x/invalidtype.py: note: In function "f":
x/invalidtype.py:4: error: Invalid type "invalidtype.MyType"

A type synonym for Union[str, int] works fine.

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