From 7539fc69d5b75f35d97fe98ba02b8a52f5617088 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Thu, 11 Jul 2019 12:57:25 -0700
Subject: [PATCH] Reduce genericity in Iterator::last

---
 src/libcore/iter/traits/iterator.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/libcore/iter/traits/iterator.rs b/src/libcore/iter/traits/iterator.rs
index 955d643fb69..d644787d2c4 100644
--- a/src/libcore/iter/traits/iterator.rs
+++ b/src/libcore/iter/traits/iterator.rs
@@ -267,7 +267,12 @@ fn add1<T>(count: usize, _: T) -> usize {
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn last(self) -> Option<Self::Item> where Self: Sized {
-        self.fold(None, |_, x| Some(x))
+        #[inline]
+        fn some<T>(_: Option<T>, x: T) -> Option<T> {
+            Some(x)
+        }
+
+        self.fold(None, some)
     }
 
     /// Returns the `n`th element of the iterator.