gen.rs

#[generator]
fn gen_ints() -> usize {
    let mut state = State1;
    loop {
        match state {
            State1 => {
                state = State2;
                return Some(1);
            }
            State2 => {
                state = State3 { y: 3 };
                return Some(2);
            }
            State3 { y } => {
                let tmp = y + 1;
                state = State4 { _return_slot: tmp };
                continue;
            }
            State4 { _return_slot } => {
                let y = _return_slot;
                state = End;
                return Some(y);
            }
            End => {
                return None;
            }
        }
    }
}