:return: None

def needs_fixed_byte(self, byte, value):
        """
        :return: None
        """
        assert isinstance(byte, int)
        assert isinstance(value, int)
        assert byte >= 0 and value >= 0
        assert byte <= 0xff and value <= 0xff
        if byte != value:
            self.parser_error("expects " + chr(value) + " in byte " + chr(byte))