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-rw-r--r--src/libcollections/btree/node.rs5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/libcollections/btree/node.rs b/src/libcollections/btree/node.rs
index 0a93bbf89c9..82d8dc286ee 100644
--- a/src/libcollections/btree/node.rs
+++ b/src/libcollections/btree/node.rs
@@ -493,7 +493,7 @@ impl<K: Clone, V: Clone> Clone for Node<K, V> {
 ///     // Now the handle still points at index 75, but on the small node, which has no index 75.
 ///     flag.set(true);
 ///
-///     println!("Uninitialized memory: {}", handle.into_kv());
+///     println!("Uninitialized memory: {:?}", handle.into_kv());
 /// }
 /// ```
 #[derive(Copy)]
@@ -1417,7 +1417,7 @@ pub type MutTraversal<'a, K, V> = AbsTraversal<ElemsAndEdges<Zip<slice::Iter<'a,
 /// An owning traversal over a node's entries and edges
 pub type MoveTraversal<K, V> = AbsTraversal<MoveTraversalImpl<K, V>>;
 
-
+#[old_impl_check]
 impl<K, V, E, Impl: TraversalImpl<K, V, E>> Iterator for AbsTraversal<Impl> {
     type Item = TraversalItem<K, V, E>;
 
@@ -1433,6 +1433,7 @@ impl<K, V, E, Impl: TraversalImpl<K, V, E>> Iterator for AbsTraversal<Impl> {
     }
 }
 
+#[old_impl_check]
 impl<K, V, E, Impl: TraversalImpl<K, V, E>> DoubleEndedIterator for AbsTraversal<Impl> {
     fn next_back(&mut self) -> Option<TraversalItem<K, V, E>> {
         let tail_is_edge = self.tail_is_edge;