code: def test_unsupported_restype_1(self):
      # Only "fundamental" result types are supported for callback
      # functions, the type must have a non-NULL stgdict->setfunc.
      # POINTER(c_double), for example, is not supported.
  
      prototype = self.functype.im_func(POINTER(c_double))
      # The type is checked when the prototype is called
      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 19 for calling the Callbacks obj's underlying member method code with example usage: obj.test_unsupported_restype_1() without return types