From c5802e9154c0650fbf0ac1d1e80eaf1a49c57188 Mon Sep 17 00:00:00 2001
From: YoshiRulz <OSSYoshiRulz@gmail.com>
Date: Fri, 2 Apr 2021 19:52:51 +1000
Subject: [PATCH] Only use IReadOnlySet in .NET 5, ICollection for other
 targets

forgot AppVeyor compiles the test project for .NET Core 3.1
---
 .../Client.Common/config/SerializationStabilityTests.cs       | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/BizHawk.Tests/Client.Common/config/SerializationStabilityTests.cs b/src/BizHawk.Tests/Client.Common/config/SerializationStabilityTests.cs
index 3f5baa4c90..4c809a94b6 100644
--- a/src/BizHawk.Tests/Client.Common/config/SerializationStabilityTests.cs
+++ b/src/BizHawk.Tests/Client.Common/config/SerializationStabilityTests.cs
@@ -13,7 +13,11 @@ namespace BizHawk.Tests.Client.Common.config
 	[TestClass]
 	public sealed class SerializationStabilityTests
 	{
+#if NET5_0
 		private static readonly IReadOnlySet<Type> KnownGoodFromStdlib = new HashSet<Type>
+#else
+		private static readonly ICollection<Type> KnownGoodFromStdlib = new HashSet<Type>
+#endif
 		{
 			typeof(bool),
 			typeof(DateTime),