GH-123185: Check for NULL after calling _PyEvalFramePushAndInit (GH-123194)

Lib/test/test_class.py

@@ -787,6 +787,19 @@ class ClassTests(unittest.TestCase):
             Type(i)
         self.assertEqual(calls, 100)
 
+    def test_specialization_class_call_doesnt_crash(self):
+        # gh-123185
+
+        class Foo:
+            def __init__(self, arg):
+                pass
+
+        for _ in range(8):
+            try:
+                Foo()
+            except:
+                pass
+
 
 from _testinternalcapi import has_inline_values