On Sun, Jul 04, 2010 at 10:31:34AM +0100, Andrew Coppin wrote: > > I have literally no idea what a type family is. I understand ATs (I think!), > but TFs make no sense to me. ATs are just TFs which happen to be associated with a particular class. So if you understand ATs then you understand TFs too, you just didn't know it. =) -Brent