Pierre-Yves David <pierre-yves.david@fb.com> [Mon, 18 May 2015 12:27:15 -0500] rev 25171
parsers: use 'next' instead of try/except
This get rid of another StopIteration abomination. The change in self.current
value is supposed to not matter as nobody should be calling '_advance' after
that (as per Matt wisdom).