1 // Compiler options: -langversion:future
14 protected A (object x)
18 public virtual int this [int i] {
32 public override int this [int i] {
34 base [i : i] = value + 4;
39 class XAttribute:Attribute
41 public XAttribute (int h)
49 static void Foo (int a)
53 public static int Main ()
62 Console.WriteLine ("ok");