Async await does not require a feature gate anymore!

nightly-examples/examples/async_fn.rs

@@ -15,7 +15,6 @@
 //!
 //! [`hello_world`]: https://github.com/tokio-rs/tokio/blob/132e9f1da5965530b63554d7a1c59824c3de4e30/tokio/examples/hello_world.rs
 #![deny(rust_2018_idioms)]
-#![feature(async_await)]
 
 use tokio;
 use tokio::io::AsyncWriteExt;

nightly-examples/examples/echo.rs

@@ -21,7 +21,6 @@
 //!
 //! [echo-example]: https://github.com/tokio-rs/tokio/blob/master/tokio/examples/echo.rs
 
-#![feature(async_await)]
 #![warn(rust_2018_idioms)]
 
 use futures::future::{FutureExt, TryFutureExt};
@@ -33,7 +32,7 @@ use std::env;
 use std::error::Error;
 use std::net::SocketAddr;
 
-use tracing::{debug, error, info, info_span, instrument, trace, trace_span, warn};
+use tracing::{debug, info, info_span, trace_span, warn};
 use tracing_futures::Instrument;
 
 #[tokio::main]

nightly-examples/examples/proxy_server.rs

@@ -1,4 +1,3 @@
-#![feature(async_await)]
 #![deny(rust_2018_idioms)]
 
 //! A proxy that forwards data to another server and forwards that server's
@@ -23,7 +22,7 @@
 //! This final terminal will connect to our proxy, which will in turn connect to
 //! the echo server, and you'll be able to see data flowing between them.
 
-use futures::{future::try_join, FutureExt, TryFutureExt};
+use futures::{future::try_join, TryFutureExt};
 use tokio::{
     self,
     io::AsyncReadExt,

nightly-examples/examples/spawny_thing.rs

@@ -1,4 +1,3 @@
-#![feature(async_await)]
 #![deny(rust_2018_idioms)]
 
 /// This is a example showing how information is scoped.
@@ -27,7 +26,7 @@ async fn parent_task(subtasks: usize) {
     let result = join_all(subtasks).await;
 
     debug!("all subtasks completed");
-    let sum = result.into_iter().sum();
+    let sum: usize = result.into_iter().sum();
     info!(sum);
 }
 
@@ -42,7 +41,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let subscriber = tracing_fmt::FmtSubscriber::builder()
         .with_filter("trace".parse::<tracing_fmt::filter::EnvFilter>()?)
         .finish();
-    tracing::subscriber::set_global_default(subscriber);
+    tracing::subscriber::set_global_default(subscriber)?;
     parent_task(10).await;
     Ok(())
 }