async_await_no_tls.rs

#![feature(async_await)]
  
pub async fn bar() -> u32{
    5
}
pub async fn foo() -> u32{
    let z = bar().await;
    5 + z
}

// Sorta lowered code

pub async fn bar() ->  ::std::future::from_generator(move || { 5 })
pub async fn foo() -> ::std::future::from_generator(move |mut cx| {
    let z = { 
        let mut pinned = bar();
        loop  {                           
            match F::poll((unsafe { <::std::pin::Pin>::new_unchecked(&mut pinned) }), cx)) {
                ::std::task::Poll::Ready(result) => break result ,
                ::std::task::Poll::Pending => { }
            }                                 
             cx = yield ();
        }                                 
    };                                
    5 + z                             
})