map.rs

fn map<T, U>(fun: |T|->U, coll: ~[T]) -> ~[U] {
    let mut acc = Vec::new();
    for elt in coll.move_iter() {
        acc.push(fun(elt));
    }
    acc.move_iter().collect()
}

fn main() {
    let x = map(|x| x+2, ~[1u,2,3]);
    println!("{:?}", x);
}