u/ArtisticHamster

I am trying to box AsyncFn to dyn type in this way:

fn box_it(
    f: impl AsyncFn() -> usize + 'static,
) -> Box<dyn Fn() -> Pin<Box<dyn Future<Output = usize>>> + 'static> {
    // let res =  Box<dyn Fn() -> Pin<Box<dyn Future<Output = usize>>> + 'static>;
    Box::new(|| {
        let fut = f();
        Box::pin(async { fut.await })
    })
}

However, there's a problem. Future in AsyncFn might have non 'static lifetime. Is there any way to write a type constraint which limits this?