bpo-43977: Make sure that tp_flags for pattern matching are inherited correctly. (GH-25813)
diff --git a/Lib/test/test_patma.py b/Lib/test/test_patma.py
index 8a273be..084d087 100644
--- a/Lib/test/test_patma.py
+++ b/Lib/test/test_patma.py
@@ -2979,6 +2979,47 @@ def f(x):
self.assertEqual(f((False, range(10, 20), True)), alts[4])
+class TestInheritance(unittest.TestCase):
+
+ def test_multiple_inheritance(self):
+ class C:
+ pass
+ class S1(collections.UserList, collections.abc.Mapping):
+ pass
+ class S2(C, collections.UserList, collections.abc.Mapping):
+ pass
+ class S3(list, C, collections.abc.Mapping):
+ pass
+ class S4(collections.UserList, dict, C):
+ pass
+ class M1(collections.UserDict, collections.abc.Sequence):
+ pass
+ class M2(C, collections.UserDict, collections.abc.Sequence):
+ pass
+ class M3(collections.UserDict, C, list):
+ pass
+ class M4(dict, collections.abc.Sequence, C):
+ pass
+ def f(x):
+ match x:
+ case []:
+ return "seq"
+ case {}:
+ return "map"
+ def g(x):
+ match x:
+ case {}:
+ return "map"
+ case []:
+ return "seq"
+ for Seq in (S1, S2, S3, S4):
+ self.assertEqual(f(Seq()), "seq")
+ self.assertEqual(g(Seq()), "seq")
+ for Map in (M1, M2, M3, M4):
+ self.assertEqual(f(Map()), "map")
+ self.assertEqual(g(Map()), "map")
+
+
class PerfPatma(TestPatma):
def assertEqual(*_, **__):