Replace internal PollExt trait with Poll inherent methods (#625)

Signed-off-by: Miguel Guarniz <mi9uel9@gmail.com>

Author: kckeiks

src/lib.rs

@@ -133,44 +133,3 @@ pub use crate::share::{FlowControl, Ping, PingPong, Pong, RecvStream, SendStream
 
 #[cfg(feature = "unstable")]
 pub use codec::{Codec, SendError, UserError};
-
-use std::task::Poll;
-
-// TODO: Get rid of this trait once https://github.com/rust-lang/rust/pull/63512
-// is stabilized.
-trait PollExt<T, E> {
-    /// Changes the success value of this `Poll` with the closure provided.
-    fn map_ok_<U, F>(self, f: F) -> Poll<Option<Result<U, E>>>
-    where
-        F: FnOnce(T) -> U;
-    /// Changes the error value of this `Poll` with the closure provided.
-    fn map_err_<U, F>(self, f: F) -> Poll<Option<Result<T, U>>>
-    where
-        F: FnOnce(E) -> U;
-}
-
-impl<T, E> PollExt<T, E> for Poll<Option<Result<T, E>>> {
-    fn map_ok_<U, F>(self, f: F) -> Poll<Option<Result<U, E>>>
-    where
-        F: FnOnce(T) -> U,
-    {
-        match self {
-            Poll::Ready(Some(Ok(t))) => Poll::Ready(Some(Ok(f(t)))),
-            Poll::Ready(Some(Err(e))) => Poll::Ready(Some(Err(e))),
-            Poll::Ready(None) => Poll::Ready(None),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-
-    fn map_err_<U, F>(self, f: F) -> Poll<Option<Result<T, U>>>
-    where
-        F: FnOnce(E) -> U,
-    {
-        match self {
-            Poll::Ready(Some(Ok(t))) => Poll::Ready(Some(Ok(t))),
-            Poll::Ready(Some(Err(e))) => Poll::Ready(Some(Err(f(e)))),
-            Poll::Ready(None) => Poll::Ready(None),
-            Poll::Pending => Poll::Pending,
-        }
-    }
-}

src/proto/streams/streams.rs

@@ -12,7 +12,6 @@ use http::{HeaderMap, Request, Response};
 use std::task::{Context, Poll, Waker};
 use tokio::io::AsyncWrite;
 
-use crate::PollExt;
 use std::sync::{Arc, Mutex};
 use std::{fmt, io};
 
@@ -1282,7 +1281,7 @@ impl OpaqueStreamRef {
         me.actions
             .recv
             .poll_pushed(cx, &mut stream)
-            .map_ok_(|(h, key)| {
+            .map_ok(|(h, key)| {
                 me.refs += 1;
                 let opaque_ref =
                     OpaqueStreamRef::new(self.inner.clone(), &mut me.store.resolve(key));

src/share.rs

@@ -5,7 +5,6 @@ use crate::proto::{self, WindowSize};
 use bytes::{Buf, Bytes};
 use http::HeaderMap;
 
-use crate::PollExt;
 use std::fmt;
 #[cfg(feature = "stream")]
 use std::pin::Pin;
@@ -307,8 +306,8 @@ impl<B: Buf> SendStream<B> {
     pub fn poll_capacity(&mut self, cx: &mut Context) -> Poll<Option<Result<usize, crate::Error>>> {
         self.inner
             .poll_capacity(cx)
-            .map_ok_(|w| w as usize)
-            .map_err_(Into::into)
+            .map_ok(|w| w as usize)
+            .map_err(Into::into)
     }
 
     /// Sends a single data frame to the remote peer.
@@ -403,7 +402,7 @@ impl RecvStream {
 
     /// Poll for the next data frame.
     pub fn poll_data(&mut self, cx: &mut Context<'_>) -> Poll<Option<Result<Bytes, crate::Error>>> {
-        self.inner.inner.poll_data(cx).map_err_(Into::into)
+        self.inner.inner.poll_data(cx).map_err(Into::into)
     }
 
     #[doc(hidden)]