Traceback (most recent call last):
  File "/nix/python3-3.12.4/lib/python3.12/py_compile.py", line 144, in compile
    code = loader.source_to_code(source_bytes, dfile or file,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap_external>", line 1059, in source_to_code
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/w/foo.py", line 6
    a[i], a[i+1] = a[i+1], a[i]
                               ^
IndentationError: unindent does not match any outer indentation level

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/nix/python3-3.12.4/lib/python3.12/py_compile.py", line 150, in compile
    raise py_exc
py_compile.PyCompileError: Sorry: IndentationError: unindent does not match any outer indentation level (foo.py, line 6)