code: def _backward_kill_word(text, pos):
      
      Kill the word behind pos. Word boundaries are the same as those
      used by _backward_word.
      """
      text, new_pos = _backward_word(text, pos)
      return text[:new_pos] + text[pos:], new_pos
docs: Kill the word behind pos. Word boundaries are the same as those
      used by _backward_word.