Update to stabilized futures_api

Author: taiki-e

futures-channel/benches/sync_mpsc.rs

@@ -1,4 +1,4 @@
-#![feature(test, futures_api)]
+#![feature(test)]
 
 extern crate test;
 use crate::test::Bencher;

futures-channel/src/lib.rs

@@ -3,8 +3,6 @@
 //! This crate provides channels that can be used to communicate between
 //! asynchronous tasks.
 
-#![feature(futures_api)]
-
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]

futures-channel/tests/channel.rs

@@ -1,4 +1,4 @@
-#![feature(async_await, await_macro, futures_api)]
+#![feature(async_await, await_macro)]
 
 use futures::channel::mpsc;
 use futures::executor::block_on;

futures-channel/tests/mpsc.rs

@@ -1,4 +1,4 @@
-#![feature(futures_api, async_await, await_macro)]
+#![feature(async_await, await_macro)]
 
 use futures::channel::{mpsc, oneshot};
 use futures::executor::{block_on, block_on_stream};

futures-channel/tests/oneshot.rs

@@ -1,5 +1,3 @@
-#![feature(futures_api)]
-
 use futures::channel::oneshot::{self, Sender};
 use futures::executor::block_on;
 use futures::future::{Future, FutureExt, poll_fn};

futures-core/src/lib.rs

@@ -1,6 +1,5 @@
 //! Core traits and types for asynchronous operations in Rust.
 
-#![feature(futures_api)]
 #![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]
 
 #![cfg_attr(not(feature = "std"), no_std)]

futures-core/src/task/__internal/atomic_waker.rs

@@ -169,7 +169,6 @@ impl AtomicWaker {
     /// Here is how `register` is used when implementing a flag.
     ///
     /// ```
-    /// #![feature(futures_api)]
     /// use futures::future::Future;
     /// use futures::task::{Context, Poll, AtomicWaker};
     /// use std::sync::atomic::AtomicBool;

futures-executor/benches/thread_notify.rs

@@ -1,4 +1,4 @@
-#![feature(test, futures_api)]
+#![feature(test)]
 
 extern crate test;
 use crate::test::Bencher;

futures-executor/src/lib.rs

@@ -1,7 +1,5 @@
 //! Built-in executors and related tools.
 
-#![feature(futures_api)]
-
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]

futures-executor/src/local_pool.rs

@@ -132,7 +132,6 @@ impl LocalPool {
     /// the `LocalPool` by using its spawner handle:
     ///
     /// ```
-    /// #![feature(futures_api)]
     /// use futures::executor::LocalPool;
     /// use futures::future::ready;
     ///
@@ -170,7 +169,6 @@ impl LocalPool {
     /// can be made. Returns `true` if one future was completed, `false` otherwise.
     ///
     /// ```
-    /// #![feature(futures_api)]
     /// use futures::executor::LocalPool;
     /// use futures::task::LocalSpawnExt;
     /// use futures::future::{ready, empty};
@@ -211,7 +209,6 @@ impl LocalPool {
     /// on any task.
     ///
     /// ```
-    /// #![feature(futures_api)]
     /// use futures::executor::LocalPool;
     /// use futures::task::LocalSpawnExt;
     /// use futures::future::{ready, empty};