標籤

continue 以及 break 都可以選擇性地接收一個迴圈標籤，用來跳出巢狀迴圈中的某一層：

fn main() {
    let s = [[5, 6, 7], [8, 9, 10], [21, 15, 32]];
    let mut elements_searched = 0;
    let target_value = 10;
    'outer: for i in 0..=2 {
        for j in 0..=2 {
            elements_searched += 1;
            if s[i][j] == target_value {
                break 'outer;
            }
        }
    }
    print!("elements searched: {elements_searched}");
}