fix unused import warning

src/secp256k1.rs

@@ -4,14 +4,12 @@
 #![crate_name = "bitcoin-secp256k1-rs"]
 #![comment = "Bindings and wrapper functions for bitcoin secp256k1 library."]
 #![feature(phase)]
+#![feature(globs)]  // for tests only
 
 
 extern crate libc;
 extern crate sync;
 
-use std::rand;
-use std::rand::Rng;
-
 use libc::{c_int, c_uchar};
 use sync::one::{Once, ONCE_INIT};
 
@@ -252,6 +250,14 @@ impl Secp256k1 {
     }
 }
 
+
+#[cfg(test)]
+mod test {
+
+    use std::rand;
+    use std::rand::Rng;
+    use super::*;
+
     #[test]
     fn invalid_pubkey() {
         let s = Secp256k1::new();
@@ -369,5 +375,4 @@ fn sign_compact_with_recovery() {
 
         assert_eq!(s.recover_compact(msg.as_slice(), sig.as_slice(), &mut pubkey, recid), Ok(()));
     }
-
-
+}