Pattern matching

use tokio::sync::mpsc;
#[tokio::main]
async fn main() {
    let (mut tx1, mut rx1) = mpsc::channel(128);
    let (mut tx2, mut rx2) = mpsc::channel(128);
        // Do something w/ `tx1` and `tx2`
    tokio::select! {
        Some(v) = rx1.recv() => {
            println!("Got {:?} from rx1", v);
        }
            println!("Got {:?} from rx2", v);
        }
        else => {
            println!("Both channels closed");
    }
}