- Hugs-Bugs - Haskell.org

functioanl dependencies bug
by Iavor Diatchki 05 May '03

05 May '03

> module Test where Consider the following class declarations: > class C a b | a -> b > class C a b => D a Given the way functional dependencies work at the moment, Hugs should probably report an error that "b" is missing (this is what GHC does). I don't really like this restriction (perhaps the determined parameters could be automatically added?), but the current situation with Hugs is very confusing... Here is what happens: Given the following instance declarations: > instance C Int Bool > instance C Char Int > instance D Int Hugs is happy, but if I swap the top two lines (the instances for C) it complains: ERROR "bug3.lhs":18 - Cannot build superclass instance *** Instance : D Int *** Context supplied : () *** Required superclass : C Int Int I am guessing, but I think "b" ends up being a free type variable, and instances are processed from the bottom up (the ubiquitous stack?), so when I swap the declarations, "b" gets bound to Int... bye iavor

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Confirmation
by Derek.Olson＠SmileAtYou.com 05 May '03

05 May '03

Confirmation for hugs-bugs(a)haskell.org Please confirm that you would like updates of my work. We have decided to add this 'double opt-in' system because some prankster decided it would be fun to add a bunch of people without their permission or knowledge. This event has led me to answer angry emails all week instead of carving. All I want to do is carve and share my work with those who can feel it and receive the light. Nobody wants more useless email, and I certainly have no desire to share my work and ideas with anyone who has no interest. Reply to this email and type 'Yes Please' in the body and you will be added. Do nothing and you will be forgotten. Derek Olson Tristan Woodworks http://www.SmileAtYou.com Highlands Ranch, Colorado

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05 May '03

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04 May '03

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MAXPATHLEN issue
by Isaac Jones 02 May '03

02 May '03

In a recent thread, it's mentioned that Hugs should ideally support arbitrarily long file names: http://www.haskell.org/pipermail/hugs-bugs/2003-April/001181.html >From Ross's reply, it seems that this is not a completely trivial fix. Perhaps we could put a bandaid on it with a #define of MAXPATHLEN as suggested in the Debian bug report: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=101506 Hurd could use some Hugs after all :) peace, isaac

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by james＠hello.com 02 May '03

02 May '03

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Arkadasa yardimci olalim
by Dr. Ahmet Yalcin 27 Apr '03

27 Apr '03

Arkadaslar, lütfen dikkate alin, yardimci olalim: Merhaba, cok zor durumda ve baska caresi kalmamis biri olarak hosgörünüze ve insan sevginize siginarak sizden bana cok kisada olsa kulak vermenizi rica edecegim. Ben, 34 yasinda evli ve 4 yasinda olan bir cocuk babasiyim. Aile hayatimizin sorunsuz ve mutlu sekilde devam ederken biricik oglumuz aniden rahatsizlandi. Uzun süren arastirmalar sonucu oglumuz Ali Can'in kalbinde hayati bir fonksiyon bozuklugunun bulundugu doktorlar tarafindan tespit edildi. Oglumuz cok acil sekilde ameliyat olmazsa maalesef hayata gözlerini yumacak. Ancak ne varki ameliyat icin gerekli olan parayi ödememiz bizim icin mümkün gözükmüyor. Bu nedenle uzun ugraslar sonucu iki önemli Internet sirketi ile yaptigimiz görüsme sonucu, bize her mailde gönderecegimiz link'in tiklanmasi durumunda cocugumuzun ameliyat masraflarina 10 Cent (= 0,10 Euro) katkida bulunacaklari yönünde anlasmaya varabildik. Bu dogrultuda sizden rica edecegimiz, sizi sözkonusu sirketlerin sayfalarina yönelten bu linki tiklamaniz. Bu linki tiklayarak sizinde ameliyat masraflarini karsilamamizda katkiniz olabilir. Sizden bu zor durumumuzda istedigimiz sadece bir tik. >> TIKLAYINIZ --> http://partners.webmasterplan.com/click.asp?ref=160073&site=2514&type=text&… Bunun yaninda bu emaili tüm tanidiklariniza gönderirseniz bize son derece yardimci olursunuz. Ne kadar kisi linki tiklarsa, gerekli olan ameliyat masrafini yakalayabilmemiz o kadar olasi olur. Hos görünüz icin tesekkür eder, saygilarimi sunarim. Mehmet Can Yakupoglu.

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Type inferrence problem
by hjgtuyl＠chello.nl 27 Apr '03

27 Apr '03

Hugs (Version Nov 2002) cannot handle the following function definition: f :: Ord a => Int -> [a] -> [a] f 0 xs = xs f _ [] = [] f n (x:y:zs) | x > y = y : (f (n - 1) x:zs) | otherwise = x : (f (n - 1) y:zs) Hugs generates the message: ERROR "C:\Program Files\Hugs98\Henk-Jan\error.hs":2 - Inferred type is not general enough *** Expression : f *** Expected type : Ord a => Int -> [a] -> [a] *** Inferred type : Ord [a] => Int -> [[a]] -> [[a]] It seems to me that this is a bug in the inferrence mechanism. Henk-Jan. --

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by IEX.CO .,LTD 23 Apr '03

23 Apr '03

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Vietnam - Hanoi Trade and Technology Transferring Company
by IEX.CO .,LTD 23 Apr '03

23 Apr '03

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