1 files changed, 36 insertions, 0 deletions
diff --git a/src/libcollections/vec_deque.rs b/src/libcollections/vec_deque.rs
index 5e1adb3d808..8d42045ff16 100644
--- a/src/libcollections/vec_deque.rs
+++ b/src/libcollections/vec_deque.rs
@@ -1856,6 +1856,15 @@ pub struct Iter<'a, T: 'a> {
     head: usize,
 }
 
+#[stable(feature = "collection_debug", since = "1.17.0")]
+impl<'a, T: 'a + fmt::Debug> fmt::Debug for Iter<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("Iter")
+         .field(&self.clone())
+         .finish()
+    }
+}
+
 // FIXME(#19839) Remove in favor of `#[derive(Clone)]`
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T> Clone for Iter<'a, T> {
@@ -1928,6 +1937,15 @@ pub struct IterMut<'a, T: 'a> {
     head: usize,
 }
 
+#[stable(feature = "collection_debug", since = "1.17.0")]
+impl<'a, T: 'a + fmt::Debug> fmt::Debug for IterMut<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("IterMut")
+         .field(&self.clone())
+         .finish()
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T> Iterator for IterMut<'a, T> {
     type Item = &'a mut T;
@@ -1994,6 +2012,15 @@ pub struct IntoIter<T> {
     inner: VecDeque<T>,
 }
 
+#[stable(feature = "collection_debug", since = "1.17.0")]
+impl<T: fmt::Debug> fmt::Debug for IntoIter<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("IntoIter")
+         .field(&self.clone())
+         .finish()
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Iterator for IntoIter<T> {
     type Item = T;
@@ -2037,6 +2064,15 @@ pub struct Drain<'a, T: 'a> {
     deque: Shared<VecDeque<T>>,
 }
 
+#[stable(feature = "collection_debug", since = "1.17.0")]
+impl<'a, T: 'a + fmt::Debug> fmt::Debug for Drain<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("Drain")
+         .field(&self.clone())
+         .finish()
+    }
+}
+
 #[stable(feature = "drain", since = "1.6.0")]
 unsafe impl<'a, T: Sync> Sync for Drain<'a, T> {}
 #[stable(feature = "drain", since = "1.6.0")]