Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0122-23.cs

@@ -0,0 +1,19 @@
+// CS0122: `C.this[int]' is inaccessible due to its protection level
+// Line: 6
+
+using System;
+using System.Collections;
+
+class C
+{
+	protected string this [int i] { set {} }
+}
+
+public class D
+{
+	void Foo ()
+	{
+		C c = new C ();
+		c [0] = null;
+	}
+}