From 6ed5d835665af89c66ea8ec7f57130f92dc9b76f Mon Sep 17 00:00:00 2001
From: Erick Tryzelaar <erick.tryzelaar@gmail.com>
Date: Thu, 3 Jul 2014 08:40:08 -0700
Subject: [PATCH 1/2] collections: grow should use the overflow-checked
 reserve_additional

---
 src/libcollections/vec.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index 2ffc168f82c0e..b8efaa78af3a9 100644
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -253,8 +253,7 @@ impl<T: Clone> Vec<T> {
     /// assert_eq!(vec, vec!("hello", "world", "world"));
     /// ```
     pub fn grow(&mut self, n: uint, value: &T) {
-        let new_len = self.len() + n;
-        self.reserve(new_len);
+        self.reserve_additional(n);
         let mut i: uint = 0u;
 
         while i < n {

From 128edc387213e59f162e10b4c5c31e93365d87a6 Mon Sep 17 00:00:00 2001
From: Erick Tryzelaar <erick.tryzelaar@gmail.com>
Date: Thu, 3 Jul 2014 08:45:28 -0700
Subject: [PATCH 2/2] collections: Fix conditional when reserving extra vec
 space

---
 src/libcollections/vec.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index b8efaa78af3a9..d53ecabd5a9cb 100644
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -496,7 +496,7 @@ impl<T> Vec<T> {
     /// assert!(vec.capacity() >= 10);
     /// ```
     pub fn reserve(&mut self, capacity: uint) {
-        if capacity >= self.len {
+        if capacity > self.cap {
             self.reserve_exact(num::next_power_of_two(capacity))
         }
     }