Enable feature bound_cloned for tests

Author: czipperz

src/libcore/ops/range.rs

@@ -702,6 +702,7 @@ impl<T: Clone> Bound<&T> {
     /// # Examples
     ///
     /// ```
+    /// #![feature(bound_cloned)]
     /// use std::ops::Bound::*;
     /// use std::ops::RangeBounds;
     ///

src/libcore/tests/lib.rs

@@ -1,3 +1,4 @@
+#![feature(bound_cloned)]
 #![feature(box_syntax)]
 #![feature(cell_update)]
 #![feature(core_private_bignum)]