def __init__(self, type_, value, traceback):
        self._type = type_
        self._value = value
        self._traceback = traceback
Watch a forum and return it.
dataset/ETHPy150Open crossbario/txaio/txaio/aio.py/FailedFuture.__init__--crossover with--dataset/ETHPy150Open mozilla/kitsune/kitsune/forums/tests/test_notifications.py/NotificationsTests._toggle_watch_forum_as