docs: def futurize_module(module_path, show_diff, write_update):
      """2to3 uses AST, not Baron."""
      logging.info('Futurizing module... path="{}"'.format(module_path))
      ast_tree = back_to_the_futurize(module_path)
      return d1_dev.util.update_module_file_ast(
          ast_tree, module_path, show_diff, write_update
      )