Imported Upstream version 3.10.0

Former-commit-id: 172c8e3c300b39d5785c7a3e8dfb08ebdbc1a99b

mcs/errors/cs0023-21.cs

@@ -0,0 +1,12 @@
+// CS0023: The `?' operator cannot be applied to operand of type `int*'
+// Line: 10
+// Compiler options: -unsafe
+
+class C
+{
+	unsafe static void Main ()
+	{
+		int* arr = null;
+		var v2 = arr?.ToString ();
+	}
+}