code: def test_ensure_flags_dont_clash(self):
      # bpo-39562: test that future flags and compiler flags doesn't clash
  
      # obtain future flags (CO_FUTURE_***) from the __future__ module
      flags = {
          f"CO_FUTURE_{future.upper()}": getattr(
              __future__, future
          ).compiler_flag
          for future in __future__.all_feature_names
      }
      # obtain some of the exported compiler flags (PyCF_***) from the ast module
      flags |= {
          flag: getattr(ast, flag)
          for flag in dir(ast)
          if flag.startswith("PyCF_")
      }
      self.assertCountEqual(set(flags.values()), flags.values())
  
imports: import __future__
  import ast
  import unittest
  from test.support import import_helper
  from test.support.script_helper import spawn_python, kill_python
  from textwrap import dedent
  import os
  import re
  import sys
label_desc: Use image node_id 15 for calling the FutureTest obj's underlying member method code with example usage: obj.test_ensure_flags_dont_clash() without return types