From a54ec55516259d16bbb97794e61334d9b52ad7d2 Mon Sep 17 00:00:00 2001
From: nuomi1 <nuomi1@qq.com>
Date: Mon, 31 Jul 2023 03:32:19 +0800
Subject: [PATCH] fix: break reference cycling (#666)

---
 codes/swift/chapter_stack_and_queue/linkedlist_deque.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/codes/swift/chapter_stack_and_queue/linkedlist_deque.swift b/codes/swift/chapter_stack_and_queue/linkedlist_deque.swift
index f50fbbf54..9543054aa 100644
--- a/codes/swift/chapter_stack_and_queue/linkedlist_deque.swift
+++ b/codes/swift/chapter_stack_and_queue/linkedlist_deque.swift
@@ -8,7 +8,7 @@
 class ListNode {
     var val: Int // 节点值
     var next: ListNode? // 后继节点引用（指针）
-    var prev: ListNode? // 前驱节点引用（指针）
+    weak var prev: ListNode? // 前驱节点引用（指针）
 
     init(val: Int) {
         self.val = val