From 0d2d0334152f0025b00a826482f130f499e7d627 Mon Sep 17 00:00:00 2001
From: The8472 <git@infinite-source.de>
Date: Sat, 25 Jan 2020 15:01:39 +0100
Subject: [PATCH] replace unsafe ptr::write with deref-write, benchmarks show
 no difference

---
 library/alloc/src/vec.rs | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/library/alloc/src/vec.rs b/library/alloc/src/vec.rs
index 9b7f2af3ba9e..d2f92b7c0082 100644
--- a/library/alloc/src/vec.rs
+++ b/library/alloc/src/vec.rs
@@ -2086,11 +2086,8 @@ impl<T> Extend<T> for Vec<T> {
             <Self as SpecExtend<T, I::IntoIter>>::spec_extend(self, iter.into_iter())
         } else {
             // if self has no allocation then use the more powerful from_iter specializations
-            let other = SpecFrom::from_iter(iter.into_iter());
-            // replace self, don't run drop since self was empty
-            unsafe {
-                ptr::write(self, other);
-            }
+            // and overwrite self
+            *self = SpecFrom::from_iter(iter.into_iter());
         }
     }
 
@@ -2544,11 +2541,8 @@ impl<'a, T: 'a + Copy> Extend<&'a T> for Vec<T> {
             self.spec_extend(iter.into_iter())
         } else {
             // if self has no allocation then use the more powerful from_iter specializations
-            let other = SpecFrom::from_iter(iter.into_iter());
-            // replace self, don't run drop since self was empty
-            unsafe {
-                ptr::write(self, other);
-            }
+            // and overwrite self
+            *self = SpecFrom::from_iter(iter.into_iter());
         }
     }