From 0e2427cd3c52f251d135b7f8c0d73f93369b6e7e Mon Sep 17 00:00:00 2001
From: Jacob Kiesel <kieseljake@gmail.com>
Date: Tue, 5 Sep 2017 15:32:02 -0600
Subject: [PATCH] Remove unneeded copy

---
 src/liballoc/vec.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index 8141851b8c9..158331af2ae 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -2691,7 +2691,8 @@ fn next(&mut self) -> Option<T> {
                     self.del += 1;
                     return Some(ptr::read(&v[i]));
                 } else if self.del > 0 {
-                    v.swap(i - self.del, i);
+                    let del = self.del;
+                    ptr::copy_nonoverlapping(self.vec.as_ptr().offset(i), self.vec.as_mut_ptr().offset(i - del), 1);
                 }
             }
             None
-- 
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