From 81edef2c76c7560e9c2c7ed40cf195eb86a9a290 Mon Sep 17 00:00:00 2001
From: Bodil Stokke <bodil@bodil.org>
Date: Sat, 13 Apr 2019 22:48:31 +0100
Subject: [PATCH] Implement DoubleEndedIterator for Drain.

---
 src/sized_chunk.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/sized_chunk.rs b/src/sized_chunk.rs
index 32998d7..fb5cc2e 100644
--- a/src/sized_chunk.rs
+++ b/src/sized_chunk.rs
@@ -931,6 +931,20 @@ where
     }
 }
 
+impl<'a, A, N> DoubleEndedIterator for Drain<'a, A, N>
+where
+    A: 'a,
+    N: ChunkLength<A> + 'a,
+{
+    fn next_back(&mut self) -> Option<Self::Item> {
+        if self.chunk.is_empty() {
+            None
+        } else {
+            Some(self.chunk.pop_back())
+        }
+    }
+}
+
 impl<'a, A, N> ExactSizeIterator for Drain<'a, A, N>
 where
     A: 'a,