[Haskell-cafe] partial inheritance

[Maciej Marcin Piechotka]

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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