def __Expect(self, symbol_string):
    if not self.__Accept(symbol_string):
      self.__Error('Unexpected Symbol: %s' % symbol_string)
Require that the next symbol matches symbol_string, or emit an error.
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/gql/__init__.py/GQL.__Expect