gh-95196: Disable incorrect pickling of the C implemented classmethod descriptors (GH-96383)

(cherry picked from commit 77f0249308de76401bf4f3c6a057789c92f862d1)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index 21419e1..499f80a 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -2776,6 +2776,15 @@ class AbstractPickleTests:
                     unpickled = self.loads(self.dumps(method, proto))
                     self.assertEqual(method(obj), unpickled(obj))
 
+        descriptors = (
+            PyMethodsTest.__dict__['cheese'],  # static method descriptor
+            PyMethodsTest.__dict__['wine'],  # class method descriptor
+        )
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            for descr in descriptors:
+                with self.subTest(proto=proto, descr=descr):
+                    self.assertRaises(TypeError, self.dumps, descr, proto)
+
     def test_c_methods(self):
         global Subclass
         class Subclass(tuple):
@@ -2811,6 +2820,15 @@ class AbstractPickleTests:
                     unpickled = self.loads(self.dumps(method, proto))
                     self.assertEqual(method(*args), unpickled(*args))
 
+        descriptors = (
+            bytearray.__dict__['maketrans'],  # built-in static method descriptor
+            dict.__dict__['fromkeys'],  # built-in class method descriptor
+        )
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            for descr in descriptors:
+                with self.subTest(proto=proto, descr=descr):
+                    self.assertRaises(TypeError, self.dumps, descr, proto)
+
     def test_compat_pickle(self):
         tests = [
             (range(1, 7), '__builtin__', 'xrange'),