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//! Async/await syntax.
//!
//! ```
//! # #![feature(conservative_impl_trait)]
//! # #![feature(generators)]
//! # #![feature(never_type)]
//! # #![feature(prelude_import)]
//! # #![feature(proc_macro)]
//! # #[macro_use] extern crate drone_core;
//! # extern crate futures;
//! # #[prelude_import] use drone_core::prelude::*;
//! # use futures::executor::Notify;
//! # struct NotifyNop;
//! # const NOTIFY_NOP: &NotifyNop = &NotifyNop;
//! # impl Notify for NotifyNop { fn notify(&self, _id: usize) {} }
//! use drone_core::sync::spsc::oneshot;
//! use futures::executor;
//!
//! fn plus_one(
//! rx: oneshot::Receiver<usize, !>,
//! ) -> impl Future<Item = usize, Error = oneshot::RecvError<!>> {
//! AsyncFuture::new(|| {
//! let number = await!(rx)?;
//! Ok(number + 1)
//! })
//! }
//!
//! fn main() {
//! let (tx, rx) = oneshot::channel::<usize, !>();
//! let mut executor = executor::spawn(plus_one(rx));
//! assert_eq!(tx.send(Ok(1)), Ok(()));
//! assert_eq!(
//! executor.poll_future_notify(&NOTIFY_NOP, 0),
//! Ok(Async::Ready(2))
//! );
//! }
//! ```
//!
//! ```
//! # #![feature(conservative_impl_trait)]
//! # #![feature(generators)]
//! # #![feature(never_type)]
//! # #![feature(prelude_import)]
//! # #![feature(proc_macro)]
//! # #[macro_use] extern crate drone_core;
//! # extern crate futures;
//! # #[prelude_import] use drone_core::prelude::*;
//! # use futures::executor::Notify;
//! # struct NotifyNop;
//! # const NOTIFY_NOP: &NotifyNop = &NotifyNop;
//! # impl Notify for NotifyNop { fn notify(&self, _id: usize) {} }
//! use drone_core::sync::spsc::ring;
//! use futures::executor;
//!
//! fn sum(
//! rx: ring::Receiver<usize, !>,
//! ) -> impl Future<Item = usize, Error = !> {
//! AsyncFuture::new(|| {
//! let mut sum = 0;
//! await_for!(number in rx; {
//! sum += number;
//! });
//! Ok(sum)
//! })
//! }
//!
//! fn main() {
//! let (mut tx, rx) = ring::channel::<usize, !>(8);
//! let mut executor = executor::spawn(sum(rx));
//! assert_eq!(tx.send_overwrite(3), Ok(()));
//! assert_eq!(tx.send_overwrite(4), Ok(()));
//! assert_eq!(tx.send_overwrite(5), Ok(()));
//! drop(tx);
//! assert_eq!(
//! executor.poll_future_notify(&NOTIFY_NOP, 0),
//! Ok(Async::Ready(12))
//! );
//! }
//! ```
pub use AsyncFuture;