 File "formatter_example.py", line 42, in format_stack1
      41 | def format_stack1(formatter):
-->   42 |     return format_stack2(formatter)
                      ^^^^^^^^^^^^^^^^^^^^^^^^
 File "formatter_example.py", line 46, in format_stack2
      45 | def format_stack2(formatter):
-->   46 |     return list(formatter.format_stack())
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
