Jeremy Kloth: "I'm not in the position to be able to check this possibility, ATM, but it is possible that other things have also changed since this was commited 5 years ago."

I expect that many bugs have been fixed in virtualenv and venv modules, so maybe bpo-15366 was fixed indirectly?

It would be nice if you can tests on your side, since I'm not confident in my own tests :-)

I modified the build system of Python 2.7, 3.5, 3.6 and master (3.7). So you can pick any of these branches to run your test :-) I'm not sure that the bug affected or can affect Python 2.7.