let (ox, oy, w, h) = rect;
let is_outer_wall = (ox, oy) == (&0, &0); // we know this is always the outer wall of the level
for x in 0..*w {
let (ox, oy, w, h) = rect;
let is_outer_wall = (ox, oy) == (&0, &0); // we know this is always the outer wall of the level
for x in 0..*w {