// CS0314: The type `T' cannot be used as type parameter `T' in the generic type or method `IB<K,T>'. There is no boxing or type parameter conversion from `T' to `System.IDisposable' // Line: 20 public interface IA<K> where K : System.IComparable, System.IComparable<K> { } public class A<K> : IA<K> where K : System.IComparable, System.IComparable<K> { } public interface IB<K,T> where T : System.IDisposable { } public class B<K,T> : IB<K,T> where T : B<K,T>.Element, new() where K : System.IComparable, System.IComparable<K> { public abstract class Element : A<K> { } }