Can anybody suggest where to find (within the standard library) or how to easily make (e.g. in a C extension) a type without a __mro__, except for those (such as types.InstanceType) which are explicitly recorded in the dispatch table copy._deepcopy_dispatch...?
Weird request, I know, so let me explain. There's a bug in the forthcoming 2.3.5's copy.py which can be tickled only by such a type. Fixing the bug is trivially easy (I'll just use inspect.getmro(cls) instead of cls.__mro__), but I also want to add to test_copy.py a unit test that tickles the bug, rather than just commit an ``untested fix''. I'm stumped at finding a type that's suitable for reproducing the bug; I've asked the submitter of the original bug report (which comes up with Zope and some specific application -- unsuitable for a core python unit test, sigh), I've asked on python-dev, I've even IM'd a couple of Python-guru friends, but the friends are equally stumped and I'm getting no answers on python-dev nor from the submitter of the bug report. So, I thought I'd turn to the collective ingenuity of comp.lang.python... thanks in advance for any help! Alex -- http://mail.python.org/mailman/listinfo/python-list
