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//@ run-pass
#![allow(unused_must_use)]
//@ needs-threads
use std::sync::mpsc::{channel, Sender};
use std::thread;
fn child(tx: &Sender<Box<usize>>, i: usize) {
tx.send(Box::new(i)).unwrap();
}
pub fn main() {
let (tx, rx) = channel();
let n = 100;
let mut expected = 0;
let ts = (0..n).map(|i| {
expected += i;
let tx = tx.clone();
thread::spawn(move|| {
child(&tx, i)
})
}).collect::<Vec<_>>();
let mut actual = 0;
for _ in 0..n {
let j = rx.recv().unwrap();
actual += *j;
}
assert_eq!(expected, actual);
for t in ts { t.join(); }
}
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