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//@ run-pass
#![allow(unused_must_use)]
#![allow(unused_mut)]
//@ needs-threads
use std::thread;
use std::sync::mpsc::{channel, Sender};
fn start(tx: &Sender<Sender<String>>) {
let (tx2, rx) = channel();
tx.send(tx2).unwrap();
let mut a;
let mut b;
a = rx.recv().unwrap();
assert_eq!(a, "A".to_string());
println!("{}", a);
b = rx.recv().unwrap();
assert_eq!(b, "B".to_string());
println!("{}", b);
}
pub fn main() {
let (tx, rx) = channel();
let child = thread::spawn(move|| { start(&tx) });
let mut c = rx.recv().unwrap();
c.send("A".to_string()).unwrap();
c.send("B".to_string()).unwrap();
thread::yield_now();
child.join();
}
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