def on_fallback(self, data, meta):
        return
From the input stream, predict what alternative will succeed
dataset/ETHPy150Open appdotnet/ADNpy/adnpy/stream.py/StreamListener.on_fallback--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/_internal/antlr3/dfa.py/DFA.predict