rust-book/rustbook-en/listings/ch17-async-await/listing-17-18/src/main.rs

extern crate trpl; // required for mdbook test

// ANCHOR: here
use std::pin::Pin;

// -- snip --

// ANCHOR_END: here
use std::time::Duration;

fn main() {
    trpl::run(async {
        let (tx, mut rx) = trpl::channel();

        let tx1 = tx.clone();
        let tx1_fut = async move {
            let vals = vec![
                String::from("hi"),
                String::from("from"),
                String::from("the"),
                String::from("future"),
            ];

            for val in vals {
                tx1.send(val).unwrap();
                trpl::sleep(Duration::from_secs(1)).await;
            }
        };

        let rx_fut = async {
            while let Some(value) = rx.recv().await {
                println!("received '{value}'");
            }
        };

        let tx_fut = async move {
            let vals = vec![
                String::from("more"),
                String::from("messages"),
                String::from("for"),
                String::from("you"),
            ];

            for val in vals {
                tx.send(val).unwrap();
                trpl::sleep(Duration::from_secs(1)).await;
            }
        };

        // ANCHOR: here
        let futures: Vec<Pin<Box<dyn Future<Output = ()>>>> =
            vec![Box::pin(tx1_fut), Box::pin(rx_fut), Box::pin(tx_fut)];
        // ANCHOR_END: here

        trpl::join_all(futures).await;
    });
}