rust/src/test/run-pass/infinite-loops.rs

/*
  A simple way to make sure threading works. This should use all the
  CPU cycles an any machines that we're likely to see for a while.
*/
// xfail-stage1
// xfail-stage2
// xfail-stage3

use std;
import std::task::join;

fn loop(n: int) {
    let t1: task;
    let t2: task;

    if n > 0 { t1 = spawn loop(n - 1); t2 = spawn loop(n - 1); }


    while true { }
}

fn main() { let t: task = spawn loop(5); join(t); }