gh-107909: Test explicit object base in PEP695 generic classes (#108001)

sobolevn · web-flow · commit b61f5995aebb · 2023-08-16T06:30:03.000-07:00
diff --git a/Lib/test/test_type_params.py b/Lib/test/test_type_params.py
@@ -148,6 +148,10 @@ def test_disallowed_expressions(self):
         check_syntax_error(self, "def f[T: [(x := 3) for _ in range(2)]](): pass")
         check_syntax_error(self, "type T = [(x := 3) for _ in range(2)]")
 
+    def test_incorrect_mro_explicit_object(self):
+        with self.assertRaisesRegex(TypeError, r"\(MRO\) for bases object, Generic"):
+            class My[X](object): ...
+
 
 class TypeParamsNonlocalTest(unittest.TestCase):
     def test_nonlocal_disallowed_01(self):
