Imported Upstream version 5.10.0.47

Former-commit-id: d0813289fa2d35e1f8ed77530acb4fb1df441bc0

mcs/errors/cs1599-4.cs

@@ -0,0 +1,12 @@
+// CS1599: The return type of `System.TypedReference' is not allowed
+// Line: 8
+
+using System;
+
+public class Program
+{
+    public static TypedReference operator + (int a, Program b)
+    {
+    	throw new ApplicationException ();
+    }
+}