[Vala] Help requested: Abilility to subclass compact class with methods only, report error otherwise

["Jaap A. Haitsma" <jaap haitsma org>]

Hi,

I'm currently stuck with the following bug. OK I can program around
it, but I find that an ugly hack

Bug 578603 – Abilility to subclass compact class with methods only,
report error otherwise
http://bugzilla.gnome.org/show_bug.cgi?id=578603

Can somebody give me some pointers on how to implement this behaviour
in the vala compiler?

Thanks

Jaap