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Dataclass classmethods don't work #5974
Description
On master and 0.630, the following code fails with error: Incompatible return value type (got "Foo", expected "T"):
from dataclasses import dataclass
import typing as t
T = t.TypeVar('T', bound="Foo")
@dataclass
class Foo:
@classmethod
def make(cls: t.Type[T]) -> T:
return cls()
If I remove the dataclass annotation, it works fine.
Activity
JelleZijlstra commentedon Nov 29, 2018
cc @euresti since this seems to be due to the dataclasses plugin.
euresti commentedon Nov 29, 2018
Hmm. In my code I usually annotate this as:
But I hardly use inheritance.
Also I don't know why the decorator would break it. Does it happens with
@attr.s?ilevkivskyi commentedon Nov 29, 2018
This works on master
ilevkivskyi commentedon Nov 29, 2018
Also this is a duplicate of #5263 that was fixed by #5646