map.rs

use std::iter::{Iterator, FromIterator};

fn map<T, IT: Iterator<T>, U, IU: FromIterator<U>>(fun: |T|->U, coll: IT) -> IU {
    let mut acc = Vec::new();
    for elt in coll.move_iter() {  // error: type `IT` does not implement any method in scope named `move_iter`
        acc.push(fun(elt));
    }
    acc.move_iter().collect()
}

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