Enable building on beta

Author: apasel422

.travis.yml

@@ -1,12 +1,16 @@
 language: rust
-rust:
-    - nightly
 sudo: false
+matrix:
+    include:
+        - rust: beta
+        - rust: nightly
+          env: FEATURES="--features nightly"
 script:
-    - cargo build
-    - cargo test
-    - cargo doc --no-deps
+    - cargo build $FEATURES
+    - cargo test $FEATURES
+    - cargo doc --no-deps $FEATURES
 after_success: |
+    [ $TRAVIS_RUST_VERSION = nightly ] &&
     [ $TRAVIS_BRANCH = master ] &&
     [ $TRAVIS_PULL_REQUEST = false ] &&
     bash deploy-docs.sh

Cargo.toml

@@ -14,3 +14,6 @@ homepage = "https://github.com/contain-rs/linked-hash-map"
 documentation = "https://contain-rs.github.io/linked-hash-map/linked_hash_map"
 keywords = ["data-structures"]
 readme = "README.md"
+
+[features]
+nightly = []

src/lib.rs

@@ -28,7 +28,7 @@
 //! ```
 
 #![forbid(missing_docs)]
-#![cfg_attr(test, feature(test))]
+#![cfg_attr(all(feature = "nightly", test), feature(test))]
 
 use std::borrow::Borrow;
 use std::cmp::Ordering;
@@ -877,7 +877,7 @@ impl<'a, K: Hash + Eq, V, S: BuildHasher> IntoIterator for &'a mut LinkedHashMap
     fn into_iter(self) -> IterMut<'a, K, V> { self.iter_mut() }
 }
 
-#[cfg(test)]
+#[cfg(all(feature = "nightly", test))]
 mod bench {
     extern crate test;