From c5b367bf10e085c0b5b692de17579869f84e7903 Mon Sep 17 00:00:00 2001
From: Philippe-Cholet <phcholet@orange.fr>
Date: Thu, 9 Nov 2023 19:53:15 +0100
Subject: [PATCH 1/2] `PadUsing::fold`

---
 src/pad_tail.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/pad_tail.rs b/src/pad_tail.rs
index 47e62b2cf..4be781242 100644
--- a/src/pad_tail.rs
+++ b/src/pad_tail.rs
@@ -67,6 +67,18 @@ where
         let tail = self.min.saturating_sub(self.pos);
         size_hint::max(self.iter.size_hint(), (tail, Some(tail)))
     }
+
+    fn fold<B, G>(self, mut init: B, mut f: G) -> B
+    where
+        G: FnMut(B, Self::Item) -> B,
+    {
+        let mut pos = self.pos;
+        init = self.iter.fold(init, |acc, item| {
+            pos += 1;
+            f(acc, item)
+        });
+        (pos..self.min).map(self.filler).fold(init, f)
+    }
 }
 
 impl<I, F> DoubleEndedIterator for PadUsing<I, F>

From 1629077004c5d511a3882963f9332092673f13ec Mon Sep 17 00:00:00 2001
From: Philippe-Cholet <phcholet@orange.fr>
Date: Sun, 26 Nov 2023 14:07:00 +0100
Subject: [PATCH 2/2] `PadUsing::rfold`

---
 src/pad_tail.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/pad_tail.rs b/src/pad_tail.rs
index 4be781242..5595b42ba 100644
--- a/src/pad_tail.rs
+++ b/src/pad_tail.rs
@@ -97,6 +97,16 @@ where
             Some((self.filler)(self.min))
         }
     }
+
+    fn rfold<B, G>(self, mut init: B, mut f: G) -> B
+    where
+        G: FnMut(B, Self::Item) -> B,
+    {
+        init = (self.iter.len()..self.min)
+            .map(self.filler)
+            .rfold(init, &mut f);
+        self.iter.rfold(init, f)
+    }
 }
 
 impl<I, F> ExactSizeIterator for PadUsing<I, F>