From fd126fc21050abafbcda03415c998837adbe2e21 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Fri, 12 Jan 2024 14:16:45 -0800
Subject: [PATCH] Update CollectionsMarshal.cs

---
 .../src/System/Runtime/InteropServices/CollectionsMarshal.cs    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/CollectionsMarshal.cs b/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/CollectionsMarshal.cs
index e3cecd684abf6..d27f7ba75aeb2 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/CollectionsMarshal.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/CollectionsMarshal.cs
@@ -34,7 +34,7 @@ public static Span<T> AsSpan<T>(List<T>? list)
                     ThrowHelper.ThrowInvalidOperationException_ConcurrentOperationsNotSupported();
                 }
 
-                Debug.Assert(typeof(T[]) == list._items.GetType(), "Implementation depends on List<T> always using a T[] and not U[] where U : T.");
+                Debug.Assert(typeof(T[]) == list._items.GetType(), $"Implementation depends on List<T> always using a T[] and not U[] where U : T. {typeof(T[])} != {list._items.GetType()}");
                 span = new Span<T>(ref MemoryMarshal.GetArrayDataReference(items), size);
             }