Function bicoro::broadcast_until_finished

pub fn broadcast_until_finished<'a, I, O, A, B>(
    first: Coroutine<'a, I, O, A>,
    second: Coroutine<'a, I, O, B>
) -> Coroutine<'a, I, O, (A, B)>where
    I: Clone,

Sends inputs to both coroutines, and will emit outputs together

If one finishes first, the other will consume the inputs until it is finished. Both routines must finish to return Input must be cloneable as it will need to feed both This is similar to broadcast, but continues running the ‘last’ routine