chore: bump to newer nightly (#1485)

tokio-sync/src/lib.rs

@@ -6,7 +6,6 @@
     unreachable_pub
 )]
 #![doc(test(no_crate_inject, attr(deny(rust_2018_idioms))))]
-#![feature(async_await)]
 
 //! Asynchronous synchronization primitives.
 //!

tokio-sync/src/lock.rs

@@ -8,8 +8,6 @@
 //! This allows you to do something along the lines of:
 //!
 //! ```rust,no_run
-//! #![feature(async_await)]
-//!
 //! use tokio::sync::Lock;
 //!
 //! #[tokio::main]

tokio-sync/src/mpsc/bounded.rs

@@ -82,8 +82,6 @@ pub struct RecvError(());
 /// # Examples
 ///
 /// ```rust
-/// #![feature(async_await)]
-///
 /// use tokio::sync::mpsc;
 ///
 /// #[tokio::main]
@@ -132,8 +130,6 @@ impl<T> Receiver<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(async_await)]
-    ///
     /// use tokio::sync::mpsc;
     ///
     /// #[tokio::main]
@@ -152,8 +148,6 @@ impl<T> Receiver<T> {
     /// Values are buffered:
     ///
     /// ```
-    /// #![feature(async_await)]
-    ///
     /// use tokio::sync::mpsc;
     ///
     /// #[tokio::main]
@@ -221,8 +215,6 @@ impl<T> Sender<T> {
     /// previously sent value was received.
     ///
     /// ```rust
-    /// #![feature(async_await)]
-    ///
     /// use tokio::sync::mpsc;
     ///
     /// #[tokio::main]

tokio-sync/src/mpsc/unbounded.rs

@@ -100,8 +100,6 @@ impl<T> UnboundedReceiver<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(async_await)]
-    ///
     /// use tokio::sync::mpsc;
     ///
     /// #[tokio::main]
@@ -120,8 +118,6 @@ impl<T> UnboundedReceiver<T> {
     /// Values are buffered:
     ///
     /// ```
-    /// #![feature(async_await)]
-    ///
     /// use tokio::sync::mpsc;
     ///
     /// #[tokio::main]

tokio-sync/src/oneshot.rs

@@ -93,8 +93,6 @@ struct State(usize);
 /// # Examples
 ///
 /// ```
-/// #![feature(async_await)]
-///
 /// use tokio::sync::oneshot;
 ///
 /// #[tokio::main]
@@ -208,8 +206,6 @@ impl<T> Sender<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(async_await)]
-    ///
     /// use tokio::sync::oneshot;
     ///
     /// #[tokio::main]

tokio-sync/src/watch.rs

@@ -18,8 +18,6 @@
 //! # Examples
 //!
 //! ```
-//! #![feature(async_await)]
-//!
 //! use tokio::sync::watch;
 //!
 //! # async fn dox() -> Result<(), Box<dyn std::error::Error>> {
@@ -171,8 +169,6 @@ const CLOSED: usize = 1;
 /// # Examples
 ///
 /// ```
-/// #![feature(async_await)]
-///
 /// use tokio::sync::watch;
 ///
 /// # async fn dox() -> Result<(), Box<dyn std::error::Error>> {