From 8e5e0951d4731243dcaba18a46c6e0fb3cc5c772 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anthony=20=F0=9F=8C=BD?=
 <46182959+yomercy@users.noreply.github.com>
Date: Sat, 5 Oct 2024 14:18:17 +0300
Subject: [PATCH] fix MutableLinkedList when appending empty list

---
 src/mutable_list.jl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mutable_list.jl b/src/mutable_list.jl
index cf085d59..31840fc2 100644
--- a/src/mutable_list.jl
+++ b/src/mutable_list.jl
@@ -152,9 +152,9 @@ end
 
 function Base.append!(l1::MutableLinkedList{T}, l2::MutableLinkedList{T}) where T
     l1.node.prev.next = l2.node.next # l1's last's next is now l2's first
-    l2.node.prev.next = l1.node # l2's last's next is now l1.node
     l2.node.next.prev = l1.node.prev # l2's first's prev is now l1's last
-    l1.node.prev      = l2.node.prev # l1's first's prev is now l2's last
+    l1.node.prev      = l2.node.prev # l1's last is now l2's last
+    l2.node.prev.next = l1.node # l2's last's next is now l1.node
     l1.len += length(l2)
     # make l2 empty
     l2.node.prev = l2.node