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gh-148947: dataclasses: fix error on empty __class__ cell #148948

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JelleZijlstra wants to merge 2 commits intopython:mainfrom
JelleZijlstra:weirdclass
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gh-148947: dataclasses: fix error on empty __class__ cell #148948
JelleZijlstra wants to merge 2 commits intopython:mainfrom
JelleZijlstra:weirdclass

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@JelleZijlstra JelleZijlstra commented Apr 24, 2026

Also add a test demonstrating the need for the existing "is oldcls" check.

Also add a test demonstrating the need for the existing "is oldcls" check.
@JelleZijlstra JelleZijlstra added the needs backport to 3.14 bugs and security fixes label Apr 24, 2026
@johnslavik johnslavik changed the title gh-148947: dataclasses: fix crash on empty __class__ cell gh-148947: dataclasses: fix error on empty __class__ cell Apr 24, 2026
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Nice catch! 🚀

Comment thread Lib/test/test_dataclasses/__init__.py Outdated
@johnslavik johnslavik changed the title gh-148947: dataclasses: fix error on empty __class__ cell gh-148947: dataclasses: fix crash on empty __class__ cell Apr 24, 2026
@johnslavik johnslavik changed the title gh-148947: dataclasses: fix crash on empty __class__ cell gh-148947: dataclasses: fix error on empty __class__ cell Apr 24, 2026
Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
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