44 lines
880 B
C#
44 lines
880 B
C#
using System.Collections.Generic;
|
|
|
|
// comment this line to see another bug in gmcs (unrelated)
|
|
interface IB { bool foo (); }
|
|
|
|
|
|
class B : IB { public bool foo () { return true; } }
|
|
|
|
interface Filter <T> where T : IB {
|
|
T Is (IB x);
|
|
|
|
}
|
|
|
|
struct K : IB {
|
|
public bool foo () { return false; }
|
|
|
|
}
|
|
|
|
class MyFilter : Filter <K> {
|
|
public K Is (IB x) { return new K(); }
|
|
}
|
|
|
|
class MyBFilter : Filter <B> {
|
|
public B Is (IB x) { return new B(); }
|
|
}
|
|
|
|
class M {
|
|
|
|
static List<T> foo1 <T> (Filter <T> x) where T : IB {
|
|
List <T> result = new List <T>();
|
|
T maybe = x.Is (new B());
|
|
if (maybe != null)
|
|
result.Add (maybe);
|
|
return result;
|
|
}
|
|
|
|
public static void Main () {
|
|
MyFilter m = new MyFilter ();
|
|
System.Console.WriteLine (foo1 <K> (m).Count);
|
|
MyBFilter mb = new MyBFilter ();
|
|
System.Console.WriteLine (foo1 <B> (mb).Count);
|
|
}
|
|
}
|