[Haskell-beginners] Strange behavior

[Luca Ciciriello]

Ok, Thanks.
This works fine. I found out that also mapP and sumP are working as expected, but elemP and foldP do not behave correctly.

Luca.

On Aug 29, 2011, at 11:14 AM, Daniel Fischer wrote:

> On Monday 29 August 2011, 08:41:35, Luca Ciciriello wrote:
>> Hi Alba.
>> Since I've got no answer to my question I think that my strange behavior
>> is a very deep problem.
> 
> Well, perhaps it's not very deep, just not enough people on this list are 
> familiar with dph.
> In such cases, ask on haskell-cafe or #haskell to reach a wider audience.
> 
> Anyway, I'm pretty sure it's a bug in dph. If you change your code to avoid 
> elemP:
> 
> 
> isElement :: String -> Bool
> isElement x = x `elemP1` parArr
>  where
>    elemP1 :: Eq a => a -> [:a:] -> Bool
>    elemP1 v ar = lengthP (filterP (== v) ar) /= 0
> 
> you get the expected result(s) [but not with HEAD].
> 
> I've opened a ticket: http://hackage.haskell.org/trac/ghc/ticket/5438
> 
>> I let you know when I have news.
>> 
>> Bye.
>> 
>> Luca.
> 
> Cheers,
> Daniel
>