Message11081

With recent work on #2476 (https://github.com/jythontools/jython/commit/1452e07de33fd894dc4e9ddc815389f990758e83) functools.wraps is now workable. However pathlib still doesn't work; it now shows the for me the same behavior you originally describe.

TypeError: Error when calling the metaclass bases
    multiple bases have instance lay-out conflict

This is due to __slots__. You can probably fix this by guarding __slots__ in Jython case like we did (so far) in #1777, but this is tedious in pathlib case, because they use __slots__ frequently while in sympy it were only three or four occurrences.

I'll think about a better solution for the __slots__ issue.