Incompatible type with generic dataclasses inheritance #7715
Description
The following MWE:
from typing import Generic, TypeVar
import dataclasses
T = TypeVar('T')
@dataclasses.dataclass()
class A(Generic[T]):
attr: T
A(attr=0) # OK!
@dataclasses.dataclass()
class B(A[float]):
...
B(attr=float(0))
# Argument "attr" to "B" has incompatible type "float"; expected "T"
fails with "Argument "attr" to "B" has incompatible type "float"; expected "T"" error in mypy. But the B class specifies T to be float, how to fix that error?