preemption: avoid annoying warning that turns into error

tokio/src/league/mod.rs

@@ -64,8 +64,7 @@ pub(crate) fn ceded() {
 }
 
 /// Returns `Poll::Pending` if the current task has exceeded its budget and should yield.
-#[allow(unreachable_pub)]
-pub fn poll_cooperate(cx: &mut Context<'_>) -> Poll<()> {
+pub(crate) fn poll_cooperate(cx: &mut Context<'_>) -> Poll<()> {
     HITS.with(|hits| {
         let n = hits.get();
         if n == 0 {
@@ -92,8 +91,7 @@ pub fn poll_cooperate(cx: &mut Context<'_>) -> Poll<()> {
 ///     }
 /// }
 /// ```
-#[allow(unreachable_pub)]
-pub async fn cooperate() {
+pub(crate) async fn cooperate() {
     use crate::future::poll_fn;
     poll_fn(|cx| poll_cooperate(cx)).await;
 }