def clear(self):
        self._ring.clear()
        self._prev_yank = None
If the wrapped protocol doesn't have a L{logPrefix} method,
dataset/ETHPy150Open ipython/ipython-py3k/IPython/frontend/qt/console/kill_ring.py/QtKillRing.clear--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/test/test_policies.py/WrapperTestCase.test_protocolLogPrefixFallback