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fn op_listen(state: &mut OpState) -> Result<ResourceId, Error> {  log::debug!("listen");  let addr = "127.0.0.1:4570".parse::<SocketAddr>().unwrap();  let std_listener = std::net::TcpListener::bind(&addr)?;  std_listener.set_nonblocking(true)?;  let listener = TcpListener::try_from(std_listener)?;  let rid = state.resource_table.add(listener);  Ok(rid)}