public static <T> void subscribe(Publisher<? extends T> o) {
        BlockingIgnoringReceiver callback = new BlockingIgnoringReceiver();
        LambdaSubscriber<T> ls = new LambdaSubscriber<T>(Functions.emptyConsumer(),
        callback, callback, Functions.REQUEST_MAX);

        o.subscribe(ls);

        BlockingHelper.awaitForComplete(callback, ls);
        Throwable e = callback.error;
        if (e != null) {
            throw ExceptionHelper.wrapOrThrow(e);
        }
    }