From 9b2d03bd60b38c48ddc412963d6c1ea309d196ce Mon Sep 17 00:00:00 2001
From: Marijn Schouten <mhkbst@gmail.com>
Date: Wed, 24 Dec 2025 11:37:54 +0000
Subject: [PATCH] =?UTF-8?q?.checked=5Fsub(1).unwrap=5For(0)=20=E2=86=92=20?=
 =?UTF-8?q?.saturating=5Fsub(1)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 library/alloc/src/collections/linked_list.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/library/alloc/src/collections/linked_list.rs b/library/alloc/src/collections/linked_list.rs
index e738c29c237f..c98aeb80628e 100644
--- a/library/alloc/src/collections/linked_list.rs
+++ b/library/alloc/src/collections/linked_list.rs
@@ -597,7 +597,7 @@ impl<T, A: Allocator> LinkedList<T, A> {
     #[must_use]
     #[unstable(feature = "linked_list_cursors", issue = "58533")]
     pub fn cursor_back(&self) -> Cursor<'_, T, A> {
-        Cursor { index: self.len.checked_sub(1).unwrap_or(0), current: self.tail, list: self }
+        Cursor { index: self.len.saturating_sub(1), current: self.tail, list: self }
     }
 
     /// Provides a cursor with editing operations at the back element.
@@ -607,7 +607,7 @@ impl<T, A: Allocator> LinkedList<T, A> {
     #[must_use]
     #[unstable(feature = "linked_list_cursors", issue = "58533")]
     pub fn cursor_back_mut(&mut self) -> CursorMut<'_, T, A> {
-        CursorMut { index: self.len.checked_sub(1).unwrap_or(0), current: self.tail, list: self }
+        CursorMut { index: self.len.saturating_sub(1), current: self.tail, list: self }
     }
 
     /// Returns `true` if the `LinkedList` is empty.
@@ -1432,7 +1432,7 @@ impl<'a, T, A: Allocator> Cursor<'a, T, A> {
             // No current. We're at the start of the list. Yield None and jump to the end.
             None => {
                 self.current = self.list.tail;
-                self.index = self.list.len().checked_sub(1).unwrap_or(0);
+                self.index = self.list.len().saturating_sub(1);
             }
             // Have a prev. Yield it and go to the previous element.
             Some(current) => unsafe {
@@ -1559,7 +1559,7 @@ impl<'a, T, A: Allocator> CursorMut<'a, T, A> {
             // No current. We're at the start of the list. Yield None and jump to the end.
             None => {
                 self.current = self.list.tail;
-                self.index = self.list.len().checked_sub(1).unwrap_or(0);
+                self.index = self.list.len().saturating_sub(1);
             }
             // Have a prev. Yield it and go to the previous element.
             Some(current) => unsafe {