message: Add Send and Sync to Error
diff: @@ -135,7 +135,7 @@ use tokio::net::TcpStream;
  use tokio::sync::{mpsc, oneshot};
  use tokio::task;
  -pub type Error = Box<dyn std::error::Error>;
  +pub type Error = Box<dyn std::error::Error + Send + Sync>;
  const VERSION: &str = env!("CARGO_PKG_VERSION");
  const LANG: &str = "rust";
  