Make #[feature(test)] depend on #[cfg(all(test, feature = "bench"))].

* FIXES Issue #38:
   https://github.com/isislovecruft/curve25519-dalek/pull/38

Cargo.toml

@@ -36,6 +36,7 @@ version = "0.4"
 default = ["std"]
 std = ["rand"]
 yolocrypto = []
+bench = []
 
 # The development profile, used for `cargo build`.
 [profile.dev]

src/curve.rs

@@ -1354,7 +1354,7 @@ mod test {
 // Benchmarks
 // ------------------------------------------------------------------------
 
-#[cfg(test)]
+#[cfg(all(test, feature = "bench"))]
 mod bench {
     use test::Bencher;
     use constants;

src/decaf.rs

@@ -358,7 +358,7 @@ mod test {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "bench"))]
 mod bench {
     use rand::OsRng;
     use test::Bencher;

src/field.rs

@@ -1048,7 +1048,7 @@ mod test {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "bench"))]
 mod bench {
     use test::Bencher;
 

src/lib.rs

@@ -12,7 +12,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(feature = "std"), feature(collections))]
 #![allow(unused_features)]
-#![feature(test)]
+#![cfg_attr(feature = "bench", feature(test))]
 #![deny(missing_docs)] // refuse to compile if documentation is missing
 
 //! # curve25519-dalek
@@ -33,8 +33,9 @@
 //! hatred of the Daleks.  Rusty destroys the other Daleks and departs the
 //! ship, determined to track down and bring an end to the Dalek race.
 
-#[cfg(test)]
+#[cfg(all(test, feature = "bench"))]
 extern crate test;
+
 #[cfg(test)]
 extern crate sha2;
 

src/scalar.rs

@@ -707,7 +707,7 @@ mod test {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "bench"))]
 mod bench {
     use rand::OsRng;
     use test::Bencher;