1 files changed, 2 insertions, 3 deletions
diff --git a/src/test/bench/shootout-binarytrees.rs b/src/test/bench/shootout-binarytrees.rs
index 64c38722137..ce050cc7323 100644
--- a/src/test/bench/shootout-binarytrees.rs
+++ b/src/test/bench/shootout-binarytrees.rs
@@ -38,11 +38,10 @@
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 // OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#![feature(rustc_private, core)]
+#![feature(rustc_private, core, step_by)]
 
 extern crate arena;
 
-use std::iter::range_step;
 use std::thread;
 use arena::TypedArena;
 
@@ -109,7 +108,7 @@ fn main() {
     let long_lived_arena = TypedArena::new();
     let long_lived_tree = bottom_up_tree(&long_lived_arena, 0, max_depth);
 
-    let messages = range_step(min_depth, max_depth + 1, 2).map(|depth| {
+    let messages = (min_depth..max_depth + 1).step_by(2).map(|depth| {
         use std::num::Int;
         let iterations = 2.pow((max_depth - depth + min_depth) as u32);
         thread::scoped(move || inner(depth, iterations))