rust/src/test/run-pass/block-iter-2.rs

fn iter_vec<T>(v: ~[T], f: fn(T)) { for v.each |x| { f(x); } }

fn main() {
    let v = ~[1, 2, 3, 4, 5];
    let mut sum = 0;
    iter_vec(v, |i| {
        iter_vec(v, |j| {
            log(error, i * j);
            sum += i * j;
        });
    });
    log(error, sum);
    assert (sum == 225);
}