1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/test_tuple.py b/Lib/test/test_tuple.py
index d928db2324..e41711c8e6 100644
--- a/Lib/test/test_tuple.py
+++ b/Lib/test/test_tuple.py
@@ -193,6 +193,14 @@ class TupleTest(seq_tests.CommonTest):
         d = pickle.dumps(it)
         self.assertEqual(self.type2test(it), self.type2test(reversed(data))[1:])
 
+    def test_no_comdat_folding(self):
+        # Issue 8847: In the PGO build, the MSVC linker's COMDAT folding
+        # optimization causes failures in code that relies on distinct
+        # function addresses.
+        class T(tuple): pass
+        with self.assertRaises(TypeError):
+            [3,] + T((1,2))
+
 def test_main():
     support.run_unittest(TupleTest)