On Tue, 2011-07-19 at 01:13 +0200, Yves Parès wrote: > Oh, I got it: You want to have: > > class Bird b where > > class Penguin p where > > instance (Penguin b) => Bird b where > fly = -- fly method for penguins >
I haven't followed the thread carefully but why does the bird have to be a penguin? ---------- As a side note - I agree with Christopher Done that the answer is that you shouldn't require for bird to fly. Regards
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