#![feature(async_await)]
use core::future::Future;

fn main() {
    new_session_wrapper(dispatch);
}

pub async fn dispatch(buf: &mut [u8]) -> Result<(), ()> {
    buf[0] = 1;
    Ok(())
}

pub async fn new_session_wrapper<RET, DISPATCH>(mut dispatch: DISPATCH) -> ()
where
    DISPATCH: for<'a> FnMut(&'a mut [u8]) -> RET,
    RET: Future<Output = Result<(), ()>> + Send,
{
    let mut buf = [0; 10];
    loop {
        dispatch(&mut buf[..]).await;
    }
}