From 2cd5030ef592a2d4094145060c031dcae66e624f Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Wed, 18 Sep 2019 00:09:19 +0200
Subject: Deny specializing items not in the parent impl

---
 src/liballoc/boxed.rs | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/liballoc')

diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index b2789a535fe..adbc0e6ba2c 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -871,6 +871,11 @@ impl<I: Iterator + ?Sized> Iterator for Box<I> {
     fn nth(&mut self, n: usize) -> Option<I::Item> {
         (**self).nth(n)
     }
+    default fn last(self) -> Option<I::Item> {
+        let mut last = None;
+        for x in self { last = Some(x); }
+        last
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-- 
cgit 1.4.1-3-g733a5