Function bicoro::unicast_until_finished

pub fn unicast_until_finished<'a, I, IA, IB, O, A, B, F>(
    selector: F,
    first: Coroutine<'a, IA, O, A>,
    second: Coroutine<'a, IB, O, B>
) -> Coroutine<'a, I, O, (A, B)>where
    F: Fn(I) -> UnicastSelect<IA, IB> + Clone + Send + 'a,
    O: Send,
    A: Send,
    B: Send,

Unicast until both routines are completed

Unlike broadcast, there is an issue with completing unicast routines If IA is finished, the rest of its inputs will be thrown away/ignored Be careful, as this could cause the routines to never complete