core: Bring clone tests up to date in style

src/libcore/clone.rs

@@ -126,6 +126,8 @@ extern_fn_clone!(A, B, C, D, E, F)
 extern_fn_clone!(A, B, C, D, E, F, G)
 extern_fn_clone!(A, B, C, D, E, F, G, H)
 
+#[cfg(test)]
+mod test {
     #[test]
     fn test_owned_clone() {
         let a = box 5i;
@@ -150,8 +152,8 @@ fn test_borrowed_clone() {
 
     #[test]
     fn test_clone_from() {
-    let a = box 5;
-    let mut b = box 10;
+        let a = ~5;
+        let mut b = ~10;
         b.clone_from(&a);
         assert_eq!(*b, 5);
     }
@@ -169,3 +171,4 @@ fn test_extern_fn_clone() {
         let _ = test_fn_b::<int>.clone();
         let _ = test_fn_c.clone();
     }
+}