From ed7398ca30a9db50f72a53b48f653b0710908423 Mon Sep 17 00:00:00 2001
From: fengcen <fengcen.love@gmail.com>
Date: Tue, 22 Nov 2016 08:32:04 +0800
Subject: [PATCH] fix bench.

---
 src/lib.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 637cdf6..1bc8793 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -92,7 +92,7 @@
 //!
 #![recursion_limit="100"]
 #![deny(missing_docs)]
-#![cfg_attr(feature = "unstable", feature(test))]
+#![cfg_attr(all(feature = "unstable", test), feature(test))]
 
 #[macro_use]
 extern crate quick_error;
@@ -547,6 +547,7 @@ mod benches {
     extern crate test;
     use eval;
     use tree::Tree;
+    use Expr;
 
     #[bench]
     fn bench_deep_brackets(b: &mut test::Bencher) {