pub fn select_ok<I>(iter: I) -> SelectOk<<I::Item as IntoFuture>::Future> where
Creates a new future which will select the first successful future over a list of futures.
The returned future will wait for any future within
iter to be ready and Ok. Unlike
select_all, this will only return the first successful completion, or the last
failure. This is useful in contexts where any success is desired and failures
are ignored, unless all the futures fail.
This function will panic if the iterator specified contains no items.