docs: def write_structure(times=None):
      """
      Produce a formatted record of a times data structure.
  
      Args:
          times (Times, optional): If not provided, uses the current root timer.
  
      Returns:
          str: Timer tree hierarchy in a formatted string.
  
      Raises:
          TypeError: If provided argument is not a Times object.
      """
      if times is None:
          return report_loc.write_structure(f.root.times)
      else:
          if not isinstance(times, Times):
              raise TypeError("Expected Times instance for param 'times' (default is root).")
          return report_loc.write_structure(times)