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dataclasses: implicitly defined __dict__ and __weakref__ slots of inherited classes are ignored. #105866

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stdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error
@avboag

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@avboag

Bug report

Theweakref slot is redefined when inherited from a class which didn't specify slots at all (and thus has adict andweakref slots).

from dataclasses import dataclassclass A:    pass@dataclass(slots=True, weakref_slot=True)class B(A):    pass

gives the following error:

TypeError: __weakref__ slot disallowed: either we already got one, or __itemsize__ != 0

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    stdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error

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