rt: remove allow(dead_code) after JoinSet stabilization (#7826)

Author: mattiapitossi

tokio/src/runtime/task/core.rs

@@ -204,6 +204,7 @@ pub(super) struct Trailer {
     /// Consumer task waiting on completion of this task.
     pub(super) waker: UnsafeCell<Option<Waker>>,
     /// Optional hooks needed in the harness.
+    #[cfg_attr(not(tokio_unstable), allow(dead_code))] //TODO: remove when hooks are stabilized
     pub(super) hooks: TaskHarnessScheduleHooks,
 }
 

tokio/src/runtime/task/list.rs

@@ -193,9 +193,11 @@ impl<S: 'static> OwnedTasks<S> {
         self.list.len()
     }
 
-    cfg_64bit_metrics! {
-        pub(crate) fn spawned_tasks_count(&self) -> u64 {
-            self.list.added()
+    cfg_unstable_metrics! {
+        cfg_64bit_metrics! {
+            pub(crate) fn spawned_tasks_count(&self) -> u64 {
+                self.list.added()
+            }
         }
     }
 

tokio/src/runtime/task/mod.rs

@@ -178,10 +178,6 @@
 //! poll call will notice it when the poll finishes, and the task is cancelled
 //! at that point.
 
-// Some task infrastructure is here to support `JoinSet`, which is currently
-// unstable. This should be removed once `JoinSet` is stabilized.
-#![cfg_attr(not(tokio_unstable), allow(dead_code))]
-
 mod core;
 use self::core::Cell;
 use self::core::Header;

tokio/src/util/sharded_list.rs

@@ -107,10 +107,12 @@ impl<L: ShardedListItem> ShardedList<L, L::Target> {
         self.count.load(Ordering::Relaxed)
     }
 
-    cfg_64bit_metrics! {
-        /// Gets the total number of elements added to this list.
-        pub(crate) fn added(&self) -> u64 {
-            self.added.load(Ordering::Relaxed)
+    cfg_unstable_metrics! {
+        cfg_64bit_metrics! {
+            /// Gets the total number of elements added to this list.
+            pub(crate) fn added(&self) -> u64 {
+                self.added.load(Ordering::Relaxed)
+            }
         }
     }