[Twisted-Python] overly specific ImportError assert for python 3?

[Glyph]

cyli was working on <https://twistedmatrix.com/trac/ticket/7144> and encountered this peculiar failure on her branch (and not on trunk): <https://buildbot.twistedmatrix.com/builders/python-3.3-tests/builds/2212/steps/shell/logs/stdio>.

The interesting bit of the failure is that in one case, the ImportError's message is "import of 'service_identity' halted; None in sys.modules" and on trunk it's apparently 'No module named service_identity'.

The branch in question changes conch, which isn't even tested on python 3.

So... anyone have an idea what's going on?

-g