jnicholls

```Compiling syntex v0.35.0
   Compiling quasi v0.12.0
   Compiling aster v0.18.0
   Compiling quasi_codegen v0.12.0
   Compiling serde_codegen v0.7.10 (https://github.com/serde-rs/serde?rev=8a09f05644ad286e5a18c714ec1af58ed90d1d8b#8a09f056)
error[E0463]: can't find crate for `syntex`
 --> /home/vagrant/.multirust/toolchains/stable/cargo/git/checkouts/serde-1cbd136c2e06ab68/8a09f05644ad286e5a18c714ec1af58ed90d1d8b/serde_codegen/build.rs:3:5
  |
3 |     extern crate syntex;
  |     ^^^^^^^^^^^^^^^^^^^^ can't find crate

jnicholls

struct Device {
    pub data: u32
}

impl Device {
    pub fn new() -> Self { Device { data: 0 } }
    
    pub fn async(&mut self) -> BoxFuture<(), ()> {
        async_fn().and_then(|result| {
            self.data = result;

jnicholls

use std::marker::PhantomData;
use std::pin::Pin;
use std::task::{Context, Poll};

use bincode::Error;
use bytes::{Bytes, BytesMut};
use futures::{Sink, Stream, TryStream};
use pin_utils::unsafe_pinned;
use serde::{Deserialize, Serialize};
use tokio_serde::{Deserializer, FramedRead, FramedWrite, Serializer};