eventual.py has two unnecessary lines

[ivank]

In eventual.py, the body of this if block is never run (unless of course some callback mutates _events instead of calling append)

        if self._events and not self._timer:
            self._timer = reactor.callLater(0, self._turn)

I don't think it's needed because _SimpleCallQueue.append sets self._timer.

[Brian Warner]

I concur. Fixed in [7904b98a03324479b6c26a0b7a8ba51052302a09]. Thanks!