fn main() {
    'outer: for i in 0..5 {
        for j in 0..5 {
            if i + j > 4 {
                println!("breaking at i={}, j={}", i, j);
                break 'outer;
            }
            println!("({}, {})", i, j);
        }
    }

    // labeled loop with return value
    let result = 'search: loop {
        for i in 0..10 {
            if i * i > 50 {
                break 'search i;
            }
        }
    };
    println!("first i where i*i > 50: {}", result);
}