[3.14] gh-148947: dataclasses: fix error on empty __class__ cell (GH-148948) by miss-islington · Pull Request #148995 · python/cpython

…onGH-148948)

Also add a test demonstrating the need for the existing "is oldcls" check.
(cherry picked from commit 6d7bbee)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>

miss-islington requested a review from ericvsmith as a code owner

bedevere-app Bot added the awaiting review label

JelleZijlstra enabled auto-merge (squash)

JelleZijlstra merged commit 15e2b64 into python:3.14

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bedevere-app Bot removed the awaiting review label

miss-islington deleted the backport-6d7bbee-3.14 branch