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// run-pass
#![allow(unused_must_use)]
// pretty-expanded FIXME #23616
// ignore-emscripten no threads support
use std::sync::mpsc::{channel, Sender};
use std::thread;
fn start(tx: &Sender<Sender<isize>>) {
let (tx2, _rx) = channel();
tx.send(tx2).unwrap();
}
pub fn main() {
let (tx, rx) = channel();
let child = thread::spawn(move|| {
start(&tx)
});
let _tx = rx.recv().unwrap();
child.join();
}
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