pub fn main(world: World) -> Void raises {
    var outer: i32 = 0
    while outer < 3 {
        outer = outer + 1
        if outer == 2 {
            continue
        }
        var inner: i32 = 0
        while inner < 5 {
            inner = inner + 1
            if inner == 2 {
                continue
            }
            if inner == 4 {
                break
            }
            check world.out.write("inner tick\n")
        }
        if outer == 3 {
            break
        }
        check world.out.write("outer tick\n")
    }
    check world.out.write("nested break continue ok\n")
}