Remove async_await feature

.travis.yml

@@ -2,7 +2,7 @@ sudo: false
 dist: trusty
 language: rust
 cache: cargo
-rust: nightly-2019-05-09 # minimum required version for async/await
+rust: nightly-2019-08-21 # minimum required version for async/await
 
 before_install:
   - cargo install mdbook --vers '0.3.1' --debug --force

examples/01_02_why_async/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 
 use {
     futures::{

examples/01_04_async_await_primer/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 
 use futures::executor::block_on;
 

examples/01_05_http_server/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 
 // ANCHOR: imports
 use {

examples/02_03_timer/src/lib.rs

@@ -1,5 +1,3 @@
-#![feature(async_await)]
-
 // ANCHOR: imports
 use {
     std::{

examples/02_04_executor/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 
 // ANCHOR: imports
 use {

examples/03_01_async_await/src/lib.rs

@@ -1,6 +1,5 @@
 #![allow(unused)]
 #![cfg(test)]
-#![feature(async_await)]
 
 mod async_fn_and_block_examples {
 use std::future::Future;

examples/05_01_streams/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 
 mod stream_trait {
 use {

examples/05_02_iteration_and_concurrency/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 
 use {
     futures::{

examples/06_02_join/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 
 struct Book;
 struct Music;

examples/06_03_select/src/lib.rs

@@ -1,5 +1,4 @@
 #![cfg(test)]
-#![feature(async_await)]
 #![recursion_limit="128"]
 
 mod example {

src/01_getting_started/03_state_of_async_rust.md

@@ -3,8 +3,8 @@
 The asynchronous Rust ecosystem has undergone a lot of evolution over time,
 so it can be hard to know what tools to use, what libraries to invest in,
 or what documentation to read. However, the `Future` trait inside the standard
-library has recently been stabilized, and the `async`/`await` feature will
-follow shortly. The ecosystem as a whole is therefore in the midst of migrating
+library and the `async`/`await` language feature has recently been stabilized.
+The ecosystem as a whole is therefore in the midst of migrating
 to the newly-stabilized API, after which point churn will be significantly
 reduced.
 

src/01_getting_started/05_http_server_example.md

@@ -16,17 +16,7 @@ Let's add some dependencies to the `Cargo.toml` file:
 ```
 
 Now that we've got our dependencies out of the way, let's start writing some
-code. Open up `src/main.rs` and enable the `async_await` feature at the top of
-the file: 
-
-```rust
-#![feature(async_await)]
-```
-
-This adds support for the nightly-only but soon-to-be-stabilized
-`async`/`await` syntax.
-
-Additionally, we have some imports to add:
+code. We have some imports to add:
 
 ```rust
 {{#include ../../examples/01_05_http_server/src/lib.rs:imports}}