[Vala] Another interface implementation problem

[Dominique Würtz <housirer gmx de>]

Hi,

I'm struggling with the following hierarchy provided by GooCanvas (which 
I'm creating bindings for):

interface Item {
   public abstract View create_view ();
}

abstract class SimpleItem : Item {
   // This does _not_ implement create_view ()
}

class MyItem : SimpleItem {
   public override View create_view ();
}

Vala complains that it can't find I prototype for create_view () in 
SimpleItem which can be overridden. Out of curiosity I fed this 
hierarchy into the Mono C# compiler and found that C# requires you to 
implement the complete interface in SimpleItem. However, GooCanvas 
relies on these relaxed inheritance policies, so my question is, could 
Vala be modified to accept abstract classes implementing interfaces only 
partly?

Dominique