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

fn iter_vec[T](v: &[T], f: &block(&T) ) { for x: T in v { f(x); } }

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