Imported Upstream version 3.8.0

Former-commit-id: 6a76a29bd07d86e57c6c8da45c65ed5447d38a61

mcs/errors/cs0151-4.cs

@@ -0,0 +1,30 @@
+// CS0151: A switch expression of type `S1?' cannot be converted to an integral type, bool, char, string, enum or nullable type
+// Line: 24
+
+using System;
+
+struct S1
+{
+	public static implicit operator int? (S1? s)
+	{
+		throw new ApplicationException ();
+	}
+
+	public static implicit operator int (S1? s)
+	{
+		throw new ApplicationException ();
+	}
+}
+
+class C
+{
+	public static int Main ()
+	{
+		S1? s1 = new S1 ();
+		switch (s1)
+		{
+			default:
+				return 1;
+		}
+	}
+}