//@ run-pass

fn even(x: usize) -> bool {
    if x < 2 {
        return false;
    } else if x == 2 { return true; } else { return even(x - 2); }
}

fn foo(x: usize) {
    if even(x) {
        println!("{}", x);
    } else {
        panic!();
    }
}

pub fn main() { foo(2); }