From 9e8b0c604df3f09021a93a46fa160e02cb00ee9d Mon Sep 17 00:00:00 2001
From: YoshiRulz <OSSYoshiRulz@gmail.com>
Date: Wed, 25 Jan 2023 01:10:51 +1000
Subject: [PATCH] Add debugging helper `DescribeIsNull`

---
 src/BizHawk.Common/Util.cs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/BizHawk.Common/Util.cs b/src/BizHawk.Common/Util.cs
index eb28b3a6e1..9f33eaf672 100644
--- a/src/BizHawk.Common/Util.cs
+++ b/src/BizHawk.Common/Util.cs
@@ -78,6 +78,22 @@ namespace BizHawk.Common
 			return a.All(kvp => b.TryGetValue(kvp.Key, out var bVal) && comparer.Equals(kvp.Value, bVal));
 		}
 
+#if NET6_0
+		public static string DescribeIsNull<T>(T? obj, [CallerArgumentExpression("boxed")] string expr = default)
+#else
+		public static string DescribeIsNull<T>(T? obj, string expr)
+#endif
+			where T : class
+			=> $"{expr} is {(obj is null ? "null" : "not null")}";
+
+#if NET6_0
+		public static string DescribeIsNullValT<T>(T? boxed, [CallerArgumentExpression("boxed")] string expr = default)
+#else
+		public static string DescribeIsNullValT<T>(T? boxed, string expr)
+#endif
+			where T : struct
+			=> $"{expr} is {(boxed is null ? "null" : "not null")}";
+
 		/// <param name="filesize">in bytes</param>
 		/// <returns>human-readable filesize (converts units up to tebibytes)</returns>
 		public static string FormatFileSize(long filesize)