[Python] "python -m doctest" ignores files with same names in different directories

Suppose we have two files:

fail/stuff.py


"""
>>> True
False
"""

pass/stuff.py


"""
>>> True
True
"""


Then we run them both under doctest:

python -m doctest fail/stuff.py pass/stuff.py


As expected, we see an error from fail/stuff.py. But if we run them in the opposite order:

python -m doctest pass/stuff.py fail/stuff.py


Then it passes!

Is there some fundamental reason why Python's import system is unable to cope with loading tests from both files, or is doctest simply broken?

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