From 5c7711623030f13f7e2a6f1c1078b68013c2b441 Mon Sep 17 00:00:00 2001
From: Folyd <lyshuhow@gmail.com>
Date: Fri, 17 Dec 2021 11:14:02 +0800
Subject: [PATCH] Remove P: Unpin bound on impl Stream for Pin

---
 library/core/src/stream/stream.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/library/core/src/stream/stream.rs b/library/core/src/stream/stream.rs
index d102619b8e5ec..2cfddf9ad013d 100644
--- 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>) {