std: override clone_from for Vec.

A vector can reuse its allocation (and the allocations/resources of any
contained values) when cloning into an already-instantiated vector, so
we might as well do so.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index fb6c1b4c8a3..7971c332b27 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -232,4 +232,5 @@ mod std {
     pub use to_str;
     pub use ty;
     pub use unstable;
+    pub use vec;
 }