def closed(self, reason):
        self.server.remove_connection(self)
        self.protocol.connection_lost(reason)
        if not isinstance(reason, ConnectionClosed):
            logger.warn("connection closed, reason: %s" % str(reason))
        else:
            logger.info("connection closed")
Returns a file name of the flagfile for Closure Linter.
dataset/ETHPy150Open bfrog/whizzer/whizzer/server.py/Connection.closed--crossover with--dataset/ETHPy150Open googkit/googkit/googkit/lib/config.py/Config.linter_flagfile