def addError(self, test, err):
        self._successful = False
        return self._subunit.addError(
            test, util.excInfoOrFailureToExcInfo(err))
Returns a new TaskQuerySet that is a copy of the current one.
dataset/ETHPy150Open twisted/twisted/twisted/trial/reporter.py/SubunitReporter.addError--crossover with--dataset/ETHPy150Open robgolding63/tasklib/tasklib/task.py/TaskQuerySet.all