Some support code in trial's own unit tests could use deferLater to be slightly simpler

[exarkun]

src/twisted/trial/test/erroneous.py has this:

    def test_fail(self):
        """                                                                                                                                                                       
        A test which fails in the callback of the returned L{defer.Deferred}.                                                                                                     
        """
        d = defer.Deferred()
        d.addCallback(self._later)
        reactor.callLater(0, d.callback, None)
        return d

    def _later(self, res):
        self.fail("I fail later")

twisted.internet.task.deferLater would simplify this a bit.