collections: Fix conditional when reserving extra vec space

diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index b8efaa78af3a9eb68de96705236140e20c23e3ac..d53ecabd5a9cb147e5093e7ce172dd91acf1835a 100644 (file)
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -496,7 +496,7 @@ pub fn reserve_additional(&mut self, extra: uint) {
     /// 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))
         }
     }