docstr: Test that accessing `f_back` does not cause a segmentation fault on
  a frame created with `PyFrame_New` (GH-99110).
docstr_tok: ["Test","that","accessing","`","f_back","`","does","not","cause","a","segmentation","fault","on","a","frame","created","with","`","PyFrame_New","`","(","GH-99110",")","."]
code: def test_frame_fback_api(self):
      """Test that accessing `f_back` does not cause a segmentation fault on
      a frame created with `PyFrame_New` (GH-99110)."""
  
      def dummy():
          pass
  
      frame = _testcapi.frame_new(dummy.__code__, globals(), locals())
      # The following line should not cause a segmentation fault.
      self.assertIsNone(frame.f_back)
  
imports: import gc
  import operator
  import re
  import sys
  import textwrap
  import threading
  import types
  import unittest
  import weakref
  from test import support
  from test.support import threading_helper
  from test.support.script_helper import assert_python_ok
label_desc: Use image node_id 6 for calling the TestCAPI obj's underlying member method code with example usage: obj.test_frame_fback_api() without return types