old_contents: try:
      from test.support.os_helpers import FS_NONASCII
  except ImportError:
      from test.support import FS_NONASCII  # noqa
  
new_contents: try:
      from test.support.os_helper import FS_NONASCII
  except ImportError:
      from test.support import FS_NONASCII  # noqa
  
subject: Use os_helper to fix ImportError in Python 3.10