From 59b3c83a819567a1ca8b7c8535dad5bf73c855b1 Mon Sep 17 00:00:00 2001
From: Tobias Bucher <tobiasbucher5991@gmail.com>
Date: Wed, 12 Nov 2014 23:34:32 +0100
Subject: [PATCH] Fix `Vec::map_in_place` not doing what is written in the
 comment

---
 src/libcollections/vec.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index 0e3799ed9ac37..4a3418986064d 100644
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -1661,7 +1661,10 @@ impl<T> Vec<T> {
             // Create a `Vec` from our `PartialVecZeroSized` and make sure the
             // destructor of the latter will not run. None of this can panic.
             let mut result = Vec::new();
-            unsafe { result.set_len(pv.num_u); }
+            unsafe {
+                result.set_len(pv.num_u);
+                mem::forget(pv);
+            }
             result
         }
     }