Completion `break` value in `loop`

[A4-Tacks]

fn main() {
    let _: i32 = loop {
        brea$0
    };
}

Similar return $0; / return;

Expect:

fn main() {
    let _: i32 = loop {
        break $0;
    };
}

Currently:

fn main() {
    let _: i32 = loop {
        break;
    };
}