Template resolution and interfaces

[Torje Digernes]

http://pastie.org/8542555

Compositing an class via curry fails when I try to use interfaces.

Guessing that this is due to when classes are validated for
interface implementation and when templates are instantiated.

I thought this was a cool optional way to build/composite classes
instead of wrappers. Don't think it has inherent advantages
(except that trivial wrappers look silly), just another way to do
it. Any chance I can do this anytime soon? Or already by writing
somewhat smarter?