(Merge 3.1) Issue #9756: When calling a method descriptor or a slot wrapper
descriptor, the check of the object type doesn't read the __class__ attribute
anymore.  Fix a crash if a class override its __class__ attribute (e.g. a proxy
of the str type).
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index b5e86fb..1fe0de5 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -4564,6 +4564,22 @@
         with self.assertRaises(AttributeError):
             del X.__abstractmethods__
 
+    def test_proxy_call(self):
+        class FakeStr(object):
+            __class__ = str
+
+        fake_str = FakeStr()
+        # isinstance() reads __class__ on new style classes
+        self.assertTrue(isinstance(fake_str, str))
+
+        # call a method descriptor
+        with self.assertRaises(TypeError):
+            str.split(fake_str)
+
+        # call a slot wrapper descriptor
+        with self.assertRaises(TypeError):
+            str.__add__(fake_str, "abc")
+
 
 class DictProxyTests(unittest.TestCase):
     def setUp(self):