Rust recursive await

recursive_await.rs

  let recursive_got = {
    fn try_get() -> BoxFuture<'static, String> {
      async move {
        if something() {
          return "hello".to_string();
        }        
        tokio::time::sleep(Duration::from_millis(500)).await;
        try_get(driver).await
      }
      .boxed()
    }
    try_get(driver).await
  };