Stabilize noop_waker

Co-authored-by: zachs18 <[email protected]>

Author: eholk

tests/pass/async-closure-captures.rs

@@ -1,6 +1,6 @@
 // Same as rustc's `tests/ui/async-await/async-closures/captures.rs`, keep in sync
 
-#![feature(async_closure, noop_waker, async_trait_bounds)]
+#![feature(async_closure, async_trait_bounds)]
 
 use std::future::Future;
 use std::pin::pin;

tests/pass/async-closure-drop.rs

@@ -1,4 +1,4 @@
-#![feature(async_closure, noop_waker, async_trait_bounds)]
+#![feature(async_closure, async_trait_bounds)]
 
 use std::future::Future;
 use std::pin::pin;

tests/pass/async-closure.rs

@@ -1,4 +1,4 @@
-#![feature(async_closure, noop_waker, async_fn_traits)]
+#![feature(async_closure, async_fn_traits)]
 #![allow(unused)]
 
 use std::future::Future;

tests/pass/async-drop.rs

@@ -6,7 +6,7 @@
 // please consider modifying rustc's async drop test at
 // `tests/ui/async-await/async-drop.rs`.
 
-#![feature(async_drop, impl_trait_in_assoc_type, noop_waker, async_closure)]
+#![feature(async_drop, impl_trait_in_assoc_type, async_closure)]
 #![allow(incomplete_features, dead_code)]
 
 // FIXME(zetanumbers): consider AsyncDestruct::async_drop cleanup tests

tests/pass/async-fn.rs

@@ -1,5 +1,4 @@
 #![feature(never_type)]
-#![feature(noop_waker)]
 
 use std::future::Future;
 

tests/pass/dyn-star.rs

@@ -1,7 +1,6 @@
 #![feature(dyn_star)]
 #![allow(incomplete_features)]
 #![feature(custom_inner_attributes)]
-#![feature(noop_waker)]
 // rustfmt destroys `dyn* Trait` syntax
 #![rustfmt::skip]
 

tests/pass/future-self-referential.rs

@@ -1,6 +1,5 @@
 //@revisions: stack tree
 //@[tree]compile-flags: -Zmiri-tree-borrows
-#![feature(noop_waker)]
 
 use std::future::*;
 use std::marker::PhantomPinned;

tests/pass/issues/issue-miri-2068.rs

@@ -1,5 +1,3 @@
-#![feature(noop_waker)]
-
 use std::future::Future;
 use std::pin::Pin;
 use std::task::{Context, Poll, Waker};

tests/pass/move-data-across-await-point.rs

@@ -1,4 +1,3 @@
-#![feature(noop_waker)]
 use std::future::Future;
 use std::ptr;