Hi everyone.  I have an async method that can return a result containing an error. But since the method is used inside tokio threads, the error type that it returns should impl Send trait, Like this:  async fn connect() -> Result<TcpStream, Box<dyn Error + Send>> { ... }  But the problem is, after adding Send to trait bounds, I can't return normal errors using question mark ? anymore, and this for example leads to trait bound error:  Err("No proxies provided.")?;  Is there any solution?  Thanks

In this post we explore cooperative multitasking and the async/await feature of Rust. We take a detailed look how async/await works in Rust, including…