pub struct Set[T] {
mut:
    elements map[T]u8
}

pub fn (l Set[T]) == (r Set[T]) bool {
    if l.elements.len != r.elements.len {
        return false
    }
    for key, l_val in l.elements {
        r_val := r.elements[key] or { return false }
        if l_val != r_val {
            return false
        }
    }
    return true
}

fn test_main() {
    _ := Set[int]{}
}