[Haskell-beginners] Strange behavior

[Luca Ciciriello]

Hi Alba.
Since I've got no answer to my question I think that my strange behavior  is a very deep problem. 
I let you know when I have news.

Bye.

Luca.

On Aug 29, 2011, at 8:35 AM, Alba Marchisio wrote:

> Yes, I'm interested too in this problem.
> Is any body able to answer to the Luca's question? 
> 
> Alba
> 
> 2011/8/25 Luca Ciciriello <luca_ciciriello at hotmail.com>
> I found a strange behavior in my code
> 
> Here a (very) simplified version of my code:
> 
> {-# LANGUAGE PArr #-}
> {-# OPTIONS -fdph-seq #-}
> 
> module Main where
> 
> import Control.Parallel
> import GHC.PArr
> 
> parArr :: [:String:]
> parArr = [: "1", "2", "3", "4" :]
> 
> isElement :: String -> Bool
> isElement x = x `elemP` parArr
> 
> main :: IO ()
> main = do
>          putStrLn $ (show . isElement) "5"
> 
> The aspected result is "False" ("5" isn't a member of parArr), but the result I get is "True".
> 
> I've compiled this code with the command:
> ghc --make -Odph -threaded Test.hs -rtsopts -o test
> 
> and launched with:
> test +RTS -N2
> 
> My system is MacOS X 10.7.1 with Xcode 4.1 and GHC 7.0.4 (I've found the same behavior on Windows).
> 
> Its obvious I'm missing something. Could someone help me?
> 
> Thanks.
> 
> Luca.
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