Your problem lies here:
interface IBar : IFoo
{
public virtual void bar ()
{
}
}
Because IBar is an interface, it doesn't inherit from IFoo. Rather, in Vala
that syntax means whatever class implements IBar's interface must also
implement IFoo (or, IFoo is a prerequisite interface for IBar). For whatever
reason, although interfaces may implement code, in Vala an interface cannot
implement a prerequisite's methods.
I don't know the exact reason why. I suspect it's a limitation of GObject and
not Vala.
I discuss interfaces on the Yorba blog:
http://blog.yorba.org/jim/2011/11/a-few-of-my-favorite-vala-things-interface.html
-- Jim
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