pub trait EchoLauncherProxyInterface: Send + Sync {
type GetEchoResponseFut: Future<Output = Result<ClientEnd<EchoMarker>, Error>> + Send;
// Required methods
fn get_echo(&self, echo_prefix: &str) -> Self::GetEchoResponseFut;
fn get_echo_pipelined(
&self,
echo_prefix: &str,
request: ServerEnd<EchoMarker>,
) -> Result<(), Error>;
}