Mark failing test

Author: fanninpm

Lib/test/test_reprlib.py

@@ -198,6 +198,8 @@ def inner():
                                   r'int object at 0x[0-9A-Fa-f]+>')
         self.assertRegex(r(x), r'<cell at 0x.*\.\.\..*>')
 
+    # TODO: RUSTPYTHON
+    @unittest.expectedFailure
     def test_descriptors(self):
         eq = self.assertEqual
         # method descriptors