From d288c28ff323445e6157b95893072a571009a434 Mon Sep 17 00:00:00 2001
From: Thomas de Zeeuw <thomasdezeeuw@gmail.com>
Date: Mon, 6 Jan 2020 15:41:09 +0100
Subject: [PATCH] Relax the Sized bounds on Pin::map_unchecked(_mut)

---
 src/libcore/pin.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libcore/pin.rs b/src/libcore/pin.rs
index aca6fb2013881..676d2c784acee 100644
--- a/src/libcore/pin.rs
+++ b/src/libcore/pin.rs
@@ -672,6 +672,7 @@ impl<'a, T: ?Sized> Pin<&'a T> {
     #[stable(feature = "pin", since = "1.33.0")]
     pub unsafe fn map_unchecked<U, F>(self, func: F) -> Pin<&'a U>
     where
+        U: ?Sized,
         F: FnOnce(&T) -> &U,
     {
         let pointer = &*self.pointer;
@@ -763,6 +764,7 @@ impl<'a, T: ?Sized> Pin<&'a mut T> {
     #[stable(feature = "pin", since = "1.33.0")]
     pub unsafe fn map_unchecked_mut<U, F>(self, func: F) -> Pin<&'a mut U>
     where
+        U: ?Sized,
         F: FnOnce(&mut T) -> &mut U,
     {
         let pointer = Pin::get_unchecked_mut(self);