Alexander Hirner <a.hir...@gmail.com> added the comment:
Dropping ABCMeta stops at instantiation. This should be in the dataclass code
that's been generated.
File "<string>", line 2, in __init__
AttributeError: can't set attribute
Repro:
```
class QuasiABC:
@property
@abstractmethod
def x(self) -> int: ...
@dataclass(frozen=True)
class E(QuasiABC):
x: int
E(10)
```
Interestingly, frozen=False is giving the same error.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39134>
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