rust/src/test/run-pass/chan-leak.rs

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// Issue #763
use std;
import std::task;
import std::comm::chan;
import std::comm::send;
import std::comm;
import std::comm::port;
import std::comm::recv;
tag request { quit; close(chan<bool>); }
type ctx = chan<request>;
fn request_task(c: chan<ctx>) {
let p = port();
send(c, chan(p));
let req: request;
req = recv(p);
// Need to drop req before receiving it again
req = recv(p);
}
fn new() -> ctx {
let p = port();
let t = task::spawn(bind request_task(chan(p)));
let cx: ctx;
cx = recv(p);
ret cx;
}
fn main() {
let cx = new();
let p = port::<bool>();
send(cx, close(chan(p)));
send(cx, quit);
}