Comment by jihiggins

idk there are a lot of uses for it

    let dx = {
        let prev_x = x;
        x = get_x();
        x - prev_x
    };

often, it's slightly better cpp style scoping blocks if nothing else? there are tons of other little QoL things it enables though, but they're all going to be little ergonomics things that only seem worth it if you've used the language for awhile