Re: [Haskell-cafe] Factoring into type classes

Am Montag, 19. Januar 2009 14:31 schrieb Antoine Latter:

2009/1/19 Luke Palmer :

...

As a side curiosity, I would love to see an example of any data structure which has more than one Functor instance. Especially those which have more than one useful functor instance.

(,) ?

-Antoine

Wrong kind. And (,) a has only one useful instance.