1 files changed, 13 insertions, 0 deletions
diff --git a/Lib/test/test_structseq.py b/Lib/test/test_structseq.py
index 6aec63e2603..d0bc0bd7b61 100644
--- a/Lib/test/test_structseq.py
+++ b/Lib/test/test_structseq.py
@@ -2,8 +2,10 @@ import copy
 import os
 import pickle
 import re
+import textwrap
 import time
 import unittest
+from test.support import script_helper
 
 
 class StructSeqTest(unittest.TestCase):
@@ -342,6 +344,17 @@ class StructSeqTest(unittest.TestCase):
         with self.assertRaisesRegex(TypeError, error_message):
             copy.replace(r, st_mode=1, error=2)
 
+    def test_reference_cycle(self):
+        # gh-122527: Check that a structseq that's part of a reference cycle
+        # with its own type doesn't crash. Previously, if the type's dictionary
+        # was cleared first, the structseq instance would crash in the
+        # destructor.
+        script_helper.assert_python_ok("-c", textwrap.dedent(r"""
+            import time
+            t = time.gmtime()
+            type(t).refcyle = t
+        """))
+
 
 if __name__ == "__main__":
     unittest.main()