chore: make #[doc(hidden)] apis private (#2901)

tokio/src/fs/read_dir.rs

@@ -55,8 +55,7 @@ impl ReadDir {
         poll_fn(|cx| self.poll_next_entry(cx)).await
     }
 
-    #[doc(hidden)]
-    pub fn poll_next_entry(&mut self, cx: &mut Context<'_>) -> Poll<io::Result<Option<DirEntry>>> {
+    fn poll_next_entry(&mut self, cx: &mut Context<'_>) -> Poll<io::Result<Option<DirEntry>>> {
         loop {
             match self.0 {
                 State::Idle(ref mut std) => {

tokio/src/io/util/lines.rs

@@ -83,8 +83,7 @@ impl<R> Lines<R>
 where
     R: AsyncBufRead,
 {
-    #[doc(hidden)]
-    pub fn poll_next_line(
+    fn poll_next_line(
         self: Pin<&mut Self>,
         cx: &mut Context<'_>,
     ) -> Poll<io::Result<Option<String>>> {

tokio/src/io/util/split.rs

@@ -65,8 +65,7 @@ impl<R> Split<R>
 where
     R: AsyncBufRead,
 {
-    #[doc(hidden)]
-    pub fn poll_next_segment(
+    fn poll_next_segment(
         self: Pin<&mut Self>,
         cx: &mut Context<'_>,
     ) -> Poll<io::Result<Option<Vec<u8>>>> {

tokio/src/macros/scoped_tls.rs

@@ -23,9 +23,7 @@ macro_rules! scoped_thread_local {
 /// Type representing a thread local storage key corresponding to a reference
 /// to the type parameter `T`.
 pub(crate) struct ScopedKey<T> {
-    #[doc(hidden)]
     pub(crate) inner: &'static LocalKey<Cell<*const ()>>,
-    #[doc(hidden)]
     pub(crate) _marker: marker::PhantomData<T>,
 }
 

tokio/src/net/tcp/stream.rs

@@ -192,9 +192,13 @@ impl TcpStream {
         Ok(TcpStream { io })
     }
 
-    // Connects `TcpStream` asynchronously that may be built with a net2 `TcpBuilder`.
-    //
-    // This should be removed in favor of some in-crate TcpSocket builder API.
+    /// Connects `TcpStream` asynchronously that may be built with a net2 `TcpBuilder`.
+    ///
+    /// This function is intended to be replaced with some sort of TcpSocket builder.
+    /// See https://github.com/tokio-rs/tokio/issues/2902
+    ///
+    /// Despite being hidden, this function is part of the public API of Tokio v0.3, but
+    /// will be removed in v1.0 in favor of a better design.
     #[doc(hidden)]
     pub async fn connect_std(stream: net::TcpStream, addr: &SocketAddr) -> io::Result<TcpStream> {
         let io = mio::net::TcpStream::connect_stream(stream, addr)?;

tokio/src/sync/oneshot.rs

@@ -196,8 +196,7 @@ impl<T> Sender<T> {
         Ok(())
     }
 
-    #[doc(hidden)] // TODO: remove
-    pub fn poll_closed(&mut self, cx: &mut Context<'_>) -> Poll<()> {
+    fn poll_closed(&mut self, cx: &mut Context<'_>) -> Poll<()> {
         // Keep track of task budget
         let coop = ready!(crate::coop::poll_proceed(cx));
 

tokio/src/sync/tests/loom_oneshot.rs

@@ -75,8 +75,10 @@ impl Future for OnClose<'_> {
     type Output = bool;
 
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<bool> {
-        let res = self.get_mut().tx.poll_closed(cx);
-        Ready(res.is_ready())
+        let fut = self.get_mut().tx.closed();
+        crate::pin!(fut);
+
+        Ready(fut.poll(cx).is_ready())
     }
 }
 

tokio/src/time/interval.rs

@@ -122,8 +122,7 @@ pub struct Interval {
 }
 
 impl Interval {
-    #[doc(hidden)] // TODO: document
-    pub fn poll_tick(&mut self, cx: &mut Context<'_>) -> Poll<Instant> {
+    fn poll_tick(&mut self, cx: &mut Context<'_>) -> Poll<Instant> {
         // Wait for the delay to be done
         ready!(Pin::new(&mut self.delay).poll(cx));
 

tokio/tests/sync_oneshot.rs

@@ -6,11 +6,24 @@ use tokio_test::*;
 
 use std::future::Future;
 use std::pin::Pin;
+use std::task::{Context, Poll};
 
 trait AssertSend: Send {}
 impl AssertSend for oneshot::Sender<i32> {}
 impl AssertSend for oneshot::Receiver<i32> {}
 
+trait SenderExt {
+    fn poll_closed(&mut self, cx: &mut Context<'_>) -> Poll<()>;
+}
+impl<T> SenderExt for oneshot::Sender<T> {
+    fn poll_closed(&mut self, cx: &mut Context<'_>) -> Poll<()> {
+        tokio::pin! {
+            let fut = self.closed();
+        }
+        fut.poll(cx)
+    }
+}
+
 #[test]
 fn send_recv() {
     let (tx, rx) = oneshot::channel();

tokio/tests/time_interval.rs

@@ -4,6 +4,7 @@
 use tokio::time::{self, Duration, Instant};
 use tokio_test::{assert_pending, assert_ready_eq, task};
 
+use std::future::Future;
 use std::task::Poll;
 
 #[tokio::test]
@@ -58,7 +59,12 @@ async fn usage_stream() {
 }
 
 fn poll_next(interval: &mut task::Spawn<time::Interval>) -> Poll<Instant> {
-    interval.enter(|cx, mut interval| interval.poll_tick(cx))
+    interval.enter(|cx, mut interval| {
+        tokio::pin! {
+            let fut = interval.tick();
+        }
+        fut.poll(cx)
+    })
 }
 
 fn ms(n: u64) -> Duration {