Imported Upstream version 4.3.2.467

Former-commit-id: 9c2cb47f45fa221e661ab616387c9cda183f283d

mcs/tests/test-null-operator-22.cs

@@ -0,0 +1,33 @@
+class A
+{
+	public A this [string arg] {
+		get {
+			return new A ();
+		}
+		set {
+		}
+	}
+
+	public int Count (string a)
+	{
+		return 1;
+	}
+}
+
+static class B
+{
+	public static string Count (this A arg)
+	{
+		return "x";
+	}
+}
+
+class X
+{
+	public static void Main ()
+	{
+		var a = new A ();
+		var b = a ["b"]?.Count ();
+		System.Console.WriteLine (b);
+	}
+}