$ read -r -d '' code << EOM
import doctest 

if __name__ == '__main__':
    _ = object.__getattribute__.__get__(object()) 
    doctest.testmod(verbose=True)
EOM
$ python3.10 -c "$code"
1 items had no tests:
    __main__
0 tests in 1 items.
0 passed and 0 failed.
Test passed.
$ python3.11 -c "$code"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Lib/doctest.py", line 1970, in testmod
    for test in finder.find(m, name, globs=globs, extraglobs=extraglobs):
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Lib/doctest.py", line 940, in find
    self._find(tests, obj, name, module, source_lines, globs, {})
  File "/Lib/doctest.py", line 1013, in _find
    self._from_module(module, val)):
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Lib/doctest.py", line 975, in _from_module
    raise ValueError("object must be a class or function")
ValueError: object must be a class or function