def prepend(self, key, val, time=0, min_compress_len=0):
        return self._set("prepend", key, val, time, min_compress_len)
called when excution finishes with a failure
dataset/ETHPy150Open mozilla/source/vendor-local/lib/python/memcache.py/Client.prepend--crossover with--dataset/ETHPy150Open pydoit/doit/doit/reporter.py/ConsoleReporter.add_failure