code: def test_unsupported_restype_2(self):
      prototype = self.functype.im_func(object)
      self.assertRaises(TypeError, prototype, lambda: None)
  
imports: import functools
  import unittest
  from ctypes import *
  from ctypes.test import need_symbol
  import _ctypes_test
label_desc: Use image node_id 20 for calling the Callbacks obj's underlying member method code with example usage: obj.test_unsupported_restype_2() without return types