pub trait SenderExt<T> {
// Required method
fn send_in<'life0, 'async_trait>(
&'life0 self,
message: T,
after: Duration,
) -> Pin<Box<dyn Future<Output = Result<usize, SendError<T>>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
}