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dataclass(slots=True) fails if method has an empty __class__ cell #148947
Description
Bug report
Bug description:
On Python 3.14, this code:
def maker():
if False:
__class__ = 42
def method(self):
return __class__
return method
from dataclasses import dataclass
@dataclass(slots=True)
class X:
a: int
meth = maker()Fails with ValueError: Cell is empty, because some dataclasses machinery for updating the __class__ cell doesn't reckon with the possibility that the cell may be empty.
CPython versions tested on:
3.14, CPython main branch
Operating systems tested on:
macOS
Activity
[-]dataclass(slots=True) crashes if method has an empty `__class__` cell[/-][+]dataclass(slots=True) fails if method has an empty `__class__` cell[/+][-]dataclass(slots=True) fails if method has an empty `__class__` cell[/-][+]dataclass(slots=True) crashes if method has an empty `__class__` cell[/+][-]dataclass(slots=True) crashes if method has an empty `__class__` cell[/-][+]dataclass(slots=True) fails if method has an empty `__class__` cell[/+]gh-148947: dataclasses: fix error on empty __class__ cell (#148948)
pythongh-148947: dataclasses: fix error on empty __class__ cell (pyth…
[3.14] gh-148947: dataclasses: fix error on empty __class__ cell (GH-…
[3.13] pythongh-148947: dataclasses: fix error on empty __class__ cell (
[3.13] pythongh-148947: dataclasses: fix error on empty __class__ cell (
[3.13] gh-105936: Properly update closure cells for __setattr__ and _…