From 84ce206db6a1b452c3277963e8eafd99baba0668 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 7 May 2018 12:51:59 +0200
Subject: [PATCH] Change PinMut::map to be able to preserve the original
 reference's lifetime

Suggested by @dylanede at <https://github.com/rust-lang/rust/issues/49150#issuecomment-381071442>.
---
 src/libcore/mem.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
index 5d344c48cb8..a062ec7ee3d 100644
--- a/src/libcore/mem.rs
+++ b/src/libcore/mem.rs
@@ -1155,7 +1155,7 @@ impl<'a, T: ?Sized> PinMut<'a, T> {
     /// because it is one of the fields of that value), and also that you do
     /// not move out of the argument you receive to the interior function.
     #[unstable(feature = "pin", issue = "49150")]
-    pub unsafe fn map<'b, U, F>(this: &'b mut PinMut<'a, T>, f: F) -> PinMut<'b, U> where
+    pub unsafe fn map<U, F>(this: PinMut<'a, T>, f: F) -> PinMut<'a, U> where
         F: FnOnce(&mut T) -> &mut U
     {
         PinMut { inner: f(this.inner) }