From 76a8bc2473e60be35f96ecc268c6bb1d992ede78 Mon Sep 17 00:00:00 2001
From: Chris Gregory <czipperz@gmail.com>
Date: Sun, 7 Jul 2019 16:54:48 -0700
Subject: [PATCH] Use fold in Iterator::last

Replace last impl with fold
---
 src/libcore/iter/traits/iterator.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/libcore/iter/traits/iterator.rs b/src/libcore/iter/traits/iterator.rs
index 30923c7414504..d934b20a33fac 100644
--- a/src/libcore/iter/traits/iterator.rs
+++ b/src/libcore/iter/traits/iterator.rs
@@ -263,9 +263,7 @@ pub trait Iterator {
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn last(self) -> Option<Self::Item> where Self: Sized {
-        let mut last = None;
-        for x in self { last = Some(x); }
-        last
+        self.fold(None, |_, x| Some(x))
     }
 
     /// Returns the `n`th element of the iterator.