Mark instructions at end of class scope as artificial. (GH-24222)

Lib/test/test_sys_settrace.py

@@ -956,6 +956,24 @@ class TraceTestCase(unittest.TestCase):
              (2, 'line'),
              (2, 'return')])
 
+    def test_implicit_return_in_class(self):
+
+        def func():
+            class A:
+                if 3 < 9:
+                    a = 1
+                else:
+                    a = 2
+
+        self.run_and_compare(func,
+            [(0, 'call'),
+             (1, 'line'),
+             (1, 'call'),
+             (1, 'line'),
+             (2, 'line'),
+             (3, 'line'),
+             (3, 'return'),
+             (1, 'return')])
 
 class SkipLineEventsTraceTestCase(TraceTestCase):
     """Repeat the trace tests, but with per-line events skipped"""