rust/src/test/run-pass/for-each-destruct.rs

iter x() -> {x: int, y: int} {
    let i = 0;
    while i < 40 { put {x: i, y: 30 - i}; i += 10; }
}

fn main() {
    for each {x: x, y: y}: {x: int, y: int} in x() { assert (x + y == 30); }
}