Rollup merge of rust-lang#92020 - Folyd:stream-unpin, r=m-ou-se

matthiaskrgr · web-flow · commit e22aae009f05 · 2021-12-19T00:38:42.000+01:00
Remove P: Unpin bound on impl Stream for Pin Similar to rust-lang#81363.
diff --git a/library/core/src/stream/stream.rs b/library/core/src/stream/stream.rs
@@ -95,13 +95,13 @@ impl<S: ?Sized + Stream + Unpin> Stream for &mut S {
 #[unstable(feature = "async_stream", issue = "79024")]
 impl<P> Stream for Pin<P>
 where
-    P: DerefMut + Unpin,
+    P: DerefMut,
     P::Target: Stream,
 {
     type Item = <P::Target as Stream>::Item;
 
     fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
-        self.get_mut().as_mut().poll_next(cx)
+        <P::Target as Stream>::poll_next(self.as_deref_mut(), cx)
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {

Original file line number	Diff line number	Diff line change
`@@ -95,13 +95,13 @@ impl<S: ?Sized + Stream + Unpin> Stream for &mut S {`
`95`	`95`	`#[unstable(feature = "async_stream", issue = "79024")]`
`96`	`96`	`impl<P> Stream for Pin<P>`
`97`	`97`	`where`
`98`		`- P: DerefMut + Unpin,`
	`98`	`+ P: DerefMut,`
`99`	`99`	`P::Target: Stream,`
`100`	`100`	`{`
`101`	`101`	`type Item = <P::Target as Stream>::Item;`
`102`	`102`
`103`	`103`	`fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {`
`104`		`- self.get_mut().as_mut().poll_next(cx)`
	`104`	`+ <P::Target as Stream>::poll_next(self.as_deref_mut(), cx)`
`105`	`105`	`}`
`106`	`106`
`107`	`107`	`fn size_hint(&self) -> (usize, Option<usize>) {`