Imported Upstream version 5.4.0.167

Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa

mcs/errors/cs8116.cs

@@ -0,0 +1,13 @@
+// CS8116: The nullable type `byte?' pattern matching is not allowed. Consider using underlying type `byte'
+// Line: 11
+
+using System;
+
+class C
+{
+	public static void Main ()
+	{
+		object o2 = null;
+		bool r2 = o2 is Nullable<byte> t3;
+	}
+}