bstrie

fn main() {
    let numbers = [1, 2, 3];
    let keys = ["foo", "bar", "baz"];

    for iter::zip(numbers, keys) |&number, &key| {
        io::println(fmt!("%s => %d", key, number));
    }

    for iter::enumerate(keys) |&index, &key| {
        io::println(fmt!("%u => %s", index, key));
    }
}

mitsuhiko

fn main() {
    let numbers = [1, 2, 3];
    let keys = ["foo", "bar", "baz"];

    for (index, (&number, &key)): iter::enumerate(iter::zip(numbers, keys)) {
        io::println(fmt!("%u: %s => %d", index, key, number));
    }
}