new_contents: import imp
  import os
  import sys
  
  PATH = None
  EXT = None
  FILENAME = None
  NAME = '_testcapi'
  _file_exts = [x[0] for x in imp.get_suffixes() if x[2] == imp.C_EXTENSION]
  try:
      for PATH in sys.path:
          for EXT in _file_exts:
              FILENAME = NAME + EXT
              FILEPATH = os.path.join(PATH, FILENAME)
              if os.path.exists(os.path.join(PATH, FILENAME)):
                  raise StopIteration
      else:
          PATH = EXT = FILENAME = FILEPATH = None
  except StopIteration:
      pass
  del _file_exts
  
subject: Add the missing importlib.test.extension.util.