Implement Debug for map::IntoIter and set::IntoIter

README.rst

@@ -110,11 +110,11 @@ Recent Changes
 
 - 1.1.0
 
-  - Implemented ``Clone`` for ``Keys``, ``Values``, ``Iter`` (for map and set),
-    ``Difference``, ``Intersection``, ``SymmetricDifference`` and ``Union``
+  - Implemented ``Clone`` for ``map::{Iter, Keys, Values}`` and
+    ``set::{Difference, Intersection, Iter, SymmetricDifference, Union}``
 
-  - Implemented ``Debug`` for ``Keys``, ``Values``, ``Iter`` (for map and set),
-    ``Entry``, ``Difference``, ``Intersection``, ``SymmetricDifference`` and ``Union``
+  - Implemented ``Debug`` for ``map::{Entry, IntoIter, Iter, Keys, Values}`` and
+    ``set::{Difference, Intersection, IntoIter, Iter, SymmetricDifference, Union}``
 
 - 1.0.2
 

src/map.rs

@@ -1715,6 +1715,13 @@ impl<K, V> ExactSizeIterator for IntoIter<K, V> {
     }
 }
 
+impl<K: fmt::Debug, V: fmt::Debug> fmt::Debug for IntoIter<K, V> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let iter = self.iter.as_slice().iter().map(Bucket::refs);
+        f.debug_list().entries(iter).finish()
+    }
+}
+
 /// A draining iterator over the entries of a `IndexMap`.
 ///
 /// This `struct` is created by the [`drain`] method on [`IndexMap`]. See its

src/set.rs

@@ -452,6 +452,13 @@ impl<T> ExactSizeIterator for IntoIter<T> {
     }
 }
 
+impl<T: fmt::Debug> fmt::Debug for IntoIter<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let iter = self.iter.as_slice().iter().map(Bucket::key_ref);
+        f.debug_list().entries(iter).finish()
+    }
+}
+
 
 /// An iterator over the items of a `IndexSet`.
 ///