Malcolm Wallace <[EMAIL PROTECTED]> writes:
> But if contexts-on-datatypes worked correctly,
>
> data Set a = Ord a => ....
>
> then even the "real" map from Data.Set:
>
> map :: (Ord a, Ord b) => (a -> b) -> Set a -> Set b
>
> could be an instance method of Functor.
fmap ($0) . fmap const :: Functor f => f a -> f a
When applied to Set Int, how would it represent the intermediate set
of functions? Or if it was disallowed, on what basis?
--
__("< Marcin Kowalczyk
\__/ [EMAIL PROTECTED]
^^ http://qrnik.knm.org.pl/~qrczak/
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