[3.11] gh-105866: fix dataclass with slots=True, weakref_slot=True (GH-105870)

Lib/dataclasses.py

@@ -1132,8 +1132,10 @@ def _dataclass_setstate(self, state):
 
 def _get_slots(cls):
     match cls.__dict__.get('__slots__'):
+        # A class which does not define __slots__ at all is equivalent
+        # to a class defining __slots__ = ('__dict__', '__weakref__')
         case None:
-            return
+            yield from ('__dict__', '__weakref__')
         case str(slot):
             yield slot
         # Slots may be any iterable, but we cannot handle an iterator

Lib/test/test_dataclasses/__init__.py

@@ -3287,6 +3287,17 @@ class A(Base):
         self.assertIs(a.__weakref__, a_ref)
 
 
+    def test_dataclass_derived_weakref_slot(self):
+        class A:
+            pass
+
+        @dataclass(slots=True, weakref_slot=True)
+        class B(A):
+            pass
+
+        B()
+
+
 class TestDescriptors(unittest.TestCase):
     def test_set_name(self):
         # See bpo-33141.

Misc/NEWS.d/next/Library/2023-06-16-19-17-06.gh-issue-105866.0NBveV.rst

@@ -0,0 +1 @@
+Fixed ``_get_slots`` bug which caused error when defining dataclasses with slots and a weakref_slot.