code: def test_optional_no_contained_type(self):
      def optional_no_contained_type(x: Any):
          assert torch.jit.isinstance(x, Optional)
  
      x = ("1", "2", "3")
  
      err_msg = (
          "Attempted to use Optional without a contained type. "
          r"Please add a contained type, e.g. Optional\[int\]"
      )
  
      with self.assertRaisesRegex(
          RuntimeError,
          err_msg,
      ):
          torch.jit.script(optional_no_contained_type)
      with self.assertRaisesRegex(
          RuntimeError,
          err_msg,
      ):
          optional_no_contained_type(x)
  
imports: import os
  import sys
  import torch
  import warnings
  from typing import List, Any, Dict, Tuple, Optional
  from torch.testing._internal.jit_utils import JitTestCase
label_desc: Use image node_id 24 for calling the TestIsinstance obj's underlying member method code with example usage: obj.test_optional_no_contained_type() without return types