mcs/tests/gtest-571.cs

   1 using System;
   2
   3 public abstract class A<T>
   4 {
   5         public abstract A<MM> For<MM> () where MM : T;
   6 }
   7
   8 public class B<U, X, V> : A<V>
   9         where V : X
  10         where X : U
  11 {
  12         readonly A<U> _inner;
  13
  14         public B (A<U> inner)
  15         {
  16                 _inner = inner;
  17         }
  18
  19         public override A<PP> For<PP> () // base constraint is copied as PP : V
  20         {
  21                 return _inner.For<PP> ();
  22         }
  23 }
  24
  25 public class Test : A<Test>
  26 {
  27         public static void Main ()
  28         {
  29                 var t = new Test ();
  30                 new B<Test, Test, Test> (t).For<Test> ();
  31         }
  32
  33         public override A<QQ> For<QQ> ()
  34         {
  35                 return null;
  36         }
  37 }