@0⦊fn main() -> Result<(),u8> {
    let mut countdown = 10⦉@0;
    while @1,2⦊countdown > 0⦉@1,2 {
        if @3,5⦊countdown == 1⦉@3,5 @6,8⦊{
            might_fail_assert(3);
        }⦉@6,8 else if @7⦊countdown < 5⦉@7 @9,11⦊{
            might_fail_assert(2);
        }⦉@9,11@10⦊‸⦉@10
        @13,14⦊countdown -= 1⦉@13,14;
    }
    @4⦊Ok(())
}⦉@4