def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def bad(self, f, msg):
        """Callback from dirstate.walk for each explicit file that can't be
        found/accessed, with an error message."""