Euler problem #1 in Rust

problem1.rs

fn solution1 () -> int {
    let mut sum = 0;
    for i in range(1, 1000) {
        if i % 3 == 0 || i % 5 == 0 {
            sum += i;
        }
    }
    sum
}

fn solution2 () -> int {
    let mut numbers = range(1, 1000).filter(|i| i % 3 == 0 || i % 5  == 0);
    numbers.fold(0, |acc, x| acc + x)
}

fn solution3 () -> int {
    use std::iter::AdditiveIterator;
    let mut numbers = range(1, 1000).filter(|i| i % 3 == 0 || i % 5  == 0);
    numbers.sum()
}

fn main () {
    println!("{}", solution1());
    println!("{}", solution2());
    println!("{}", solution3());
}