From be1ad3a4f041df2439083fa74f1dc57e2b880e1c Mon Sep 17 00:00:00 2001
From: Zeeshan Ali Khan <zeenix@gmail.com>
Date: Tue, 10 Jun 2025 21:53:06 +0200
Subject: [PATCH] Add missing `Debug` derive to `vec::IntoIter`

---
 CHANGELOG.md   |  1 +
 src/vec/mod.rs | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ba060d326..85cf1c358c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - `bytes::BufMut` is now implemented on `VecInner`.
 - Removed generic from `history_buf::OldestOrdered`.
 - Made `LenType` opt-in.
+- Add missing `Debug` derive to `vec::IntoIter`.
 
 ### Fixed
 
diff --git a/src/vec/mod.rs b/src/vec/mod.rs
index 5a417964df..29ad3e5726 100644
--- a/src/vec/mod.rs
+++ b/src/vec/mod.rs
@@ -1495,6 +1495,31 @@ where
     }
 }
 
+impl<T, LenT: LenType, const N: usize> core::fmt::Debug for IntoIter<T, N, LenT>
+where
+    T: core::fmt::Debug,
+{
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        let s = if self.next < self.vec.len {
+            unsafe {
+                slice::from_raw_parts(
+                    self.vec
+                        .buffer
+                        .buffer
+                        .as_ptr()
+                        .cast::<T>()
+                        .add(self.next.into_usize()),
+                    (self.vec.len - self.next).into_usize(),
+                )
+            }
+        } else {
+            &[]
+        };
+
+        write!(f, "{s:?}")
+    }
+}
+
 impl<T, LenT: LenType, const N: usize> Drop for IntoIter<T, N, LenT> {
     fn drop(&mut self) {
         unsafe {