Named breaks in for loops in Rust

问题:

Is there a way to have nested for loops in Rust and break the outer one from inside the inner one, the way one could do e.g. in Java? I know Rust supports named breaks in loop but I can't seem to find information about the same regarding for.

回答1:

Yes. It uses the same syntax as lifetimes.

fn main() {
    'outer: for x in 0..5 {
        'inner: for y in 0..5 {
            println!("{},{}", x, y);
            if y == 3 {
                break 'outer;
            }
        }
    }
}

See loop labels documentation.