1 files changed, 9 insertions, 0 deletions
diff --git a/Lib/test/test_code.py b/Lib/test/test_code.py
index 2bdd7e74943..9d6b465115c 100644
--- a/Lib/test/test_code.py
+++ b/Lib/test/test_code.py
@@ -320,6 +320,15 @@ class CodeTest(unittest.TestCase):
         with self.assertRaises(ValueError):
             co.replace(co_nlocals=co.co_nlocals + 1)
 
+    def test_shrinking_localsplus(self):
+        # Check that PyCode_NewWithPosOnlyArgs resizes both
+        # localsplusnames and localspluskinds, if an argument is a cell.
+        def func(arg):
+            return lambda: arg
+        code = func.__code__
+        newcode = code.replace(co_name="func")  # Should not raise SystemError
+        self.assertEqual(code, newcode)
+
     def test_empty_linetable(self):
         def func():
             pass