Hello Bullat,
>> also, ghc66 adds impredicative polymorphism. how it differs from
>> unqualified existentials?
> I have not tried ghc66, but I think one of the things you should be able to
> do and that
> is perhaps helpful for understanding existencial is:
>
> > myList :: [forall a . Num a =>
Hello Bullat,
>now i'm reading Haskell' proposals and found that these two things
>considered as different:
>
>http://hackage.haskell.org/trac/haskell-prime/wiki/ExistentialQuantification
>http://hackage.haskell.org/trac/haskell-prime/wiki/PolymorphicComponents
>
>can you please explain
Hello Ross,
Thursday, September 21, 2006, 12:55:40 PM, you wrote:
>> data Ex = forall a. Num a => Ex a
>>
>> and
>>
>> data Po = Po (forall a. Num a => a)
> Consider the types of the constructors:
> Ex :: forall a. (Num a) => a -> Ex
> Po :: (forall a. (Num a) => a) -> Po
sorry, Ross, can y
[apologies to Bulat for the repeat posting]
On Thu, Sep 21, 2006 at 12:05:23PM +0400, Bulat Ziganshin wrote:
> now i'm reading Haskell' proposals and found that these two things
> considered as different:
>
> http://hackage.haskell.org/trac/haskell-prime/wiki/ExistentialQuantification
> http://ha
Hello haskell-cafe,
now i'm reading Haskell' proposals and found that these two things
considered as different:
http://hackage.haskell.org/trac/haskell-prime/wiki/ExistentialQuantification
http://hackage.haskell.org/trac/haskell-prime/wiki/PolymorphicComponents
can you please explain me what is
