You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: server.rs
    path of file: ./repos/materialize/src/cluster/src
    
    the code of the file until where you have to start completion: // Copyright Materialize, Inc. and contributors. All rights 
    
    async fn send(&mut self, cmd: C) -> Result<(), Error> {
        // Changing this debug statement requires changing the replica-isolation test
        tracing::debug!("ClusterClient send={:?}", &cmd);
        match cmd.try_into_timely_config() {
            Ok((config, epoch)) => self.build(config, epoch).await,
            Err(cmd) => self.inner.as_mut().expect("initialized").send(cmd).await,
        }
    }