rust/src/test/run-pass/fact.rs

// -*- rust -*-
fn f(x: int) -> int {
    // debug!{"in f:"};

    log(debug, x);
    if x == 1 {
        // debug!{"bottoming out"};

        return 1;
    } else {
        // debug!{"recurring"};

        let y: int = x * f(x - 1);
        // debug!{"returned"};

        log(debug, y);
        return y;
    }
}

fn main() {
    assert (f(5) == 120);
    // debug!{"all done"};

}