src/tools/rustfmt/tests/source/label_break.rs

// format with label break value.
fn main() {

'empty_block: {}

'block: {
    do_thing();
    if condition_not_met() {
        break 'block;
    }
    do_next_thing();
    if condition_not_met() {
        break 'block;
    }
    do_last_thing();
}

let result = 'block: {
    if foo() {
        // comment
        break 'block       1;
    }
    if bar() { /* comment */
        break 'block      2;
    }
    3
};
}