Eric V. Smith <e...@trueblade.com> added the comment:
My point is that the problem is that after:
@dataclass
class Base:
__slots__ = ('x',)
x: Any
Base.x has a value (it's the member_descriptor for x). That's what's causing
the problem that when adding a field to the derived class, it thinks you're
adding a field without a default value after one that has a default value.
I agree that I could detect this specific case and allow it. My comment about
the error message was inaccurate.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33100>
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