1 files changed, 13 insertions, 0 deletions
diff --git a/components/range/lib.rs b/components/range/lib.rs
index 8c5ca095f53..24c7231946c 100644
--- a/components/range/lib.rs
+++ b/components/range/lib.rs
@@ -193,6 +193,19 @@ impl<I: RangeIndex> Iterator for EachIndex<I> {
     }
 }
 
+impl<I: RangeIndex> DoubleEndedIterator for EachIndex<I> {
+    #[inline]
+    fn next_back(&mut self) -> Option<Self::Item> {
+        if self.start < self.stop {
+            let next = self.stop - I::one();
+            self.stop = next;
+            Some(next)
+        } else {
+            None
+        }
+    }
+}
+
 impl<I: RangeIndex> Range<I> {
     /// Create a new range from beginning and length offsets. This could be
     /// denoted as `[begin, begin + length)`.