From 3e38a049542fe7a2b4ff07738292f865059cb3a1 Mon Sep 17 00:00:00 2001
From: martincostello <martin@martincostello.com>
Date: Thu, 11 Jul 2024 15:28:47 +0100
Subject: [PATCH] Use System.Threading.Lock

Use `System.Threading.Lock` instead of an object to resolve `IDE0330` warning in .NET 9 preview 7.
---
 src/ProjectEuler/Puzzles/Puzzle014.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ProjectEuler/Puzzles/Puzzle014.cs b/src/ProjectEuler/Puzzles/Puzzle014.cs
index 1b301a18..94a4ae39 100644
--- a/src/ProjectEuler/Puzzles/Puzzle014.cs
+++ b/src/ProjectEuler/Puzzles/Puzzle014.cs
@@ -13,7 +13,7 @@ public sealed class Puzzle014 : Puzzle
     /// </summary>
     private static readonly Dictionary<long, int> _cache = new(1_000_000);
 
-    private static readonly object _lock = new();
+    private static readonly System.Threading.Lock _lock = new();
 
     /// <inheritdoc />
     public override string Question => "Which starting number, under one million, produces the longest chain?";