struct Point {
    x: u64;
    y: u64;
}

struct Line {
    start: Point;
    end: Point;
}

function slope(l) -> u64
    (l.end.y - l.start.y) / (l.end.x - l.start.x);

test = Line {
    start: Point {
        x: 1;
        y: 2;
    };
    end: Point {
        x: 2;
        y: 4;
    };
};

foo = slope(test);

print foo;