I'm trying to port zope.proxy to Python 3, and most tests seem to work, but investigating those two who doesn't is confusing. The first one is the test to prevent pickling. This works under Python 2, but as I understand it it should work by implementing a __reduce__ function that throws an exception. But that method is never called under Python 2. Instead a pickling error is thrown, but this is because the pickler has no special knowledge about proxies, and then tries to find __reduce__ and fails. Apparently the __reduce__of the proxy isn't found, weirdly enough. In Python 3, the base object now *has* __reduce__, so it *is* found and used, so the test fails. So there is something I'm missing here. It seems to be that two bugs cancel each other out under Python 2, and under Python 3 they don't, and the test fails. //Lennart