April 2003 - Hugs-Bugs

Re: [Newbie]Unexpected signal from FFI on Solaris 8
by Alastair Reid 09 May '03

09 May '03

[redirected to hugs-bugs] Marco Vezzoli <marco.vezzoli(a)st.com> writes: > Hi, I'm learning how to use ffi with hugs (latest version, on > Solaris 8). I can compile this simple example without errors > [...] > Hugs loads correctly the module but fails one of the tests: > [...] Thanks for an excellent bug report. I was easily able to repeat what you did! On my machine (Linux/x86 running the CVS copy of Hugs), things worked fine and I got this output: Test> testIncr 2 Test> testTimes times running 3 aaa Test> [Leaving Hugs] Looks like a bug. The major possibilities are: 1) The problem is a Solaris specific bug in Hugs. This is highly likely since Sparcs have some peculiar calling conventions and, more importantly, most testing has been on my Linux/x86 and Windows/x86 machines. 2) The problem is a C compiler specific bug in Hugs. Solaris boxes usually have a Sun compiler and it's often true that gcc isn't installed, properly maintained or the default compiler. Again, most testing has been with gcc. 3) The problem was present in the official release but has been fixed in the CVS repository. I don't recall any fixes - but it's been a busy 6 months for me since the release. 4) The problem is in your code. I don't see an obvious problem. Can someone who uses the standard release check whether the bug shows up on solaris and/or non-solaris machines? Can you (Marco) rerun ffihugs with the additional flag '+L"-v"' to find out which compiler you're using: ffihugs -P{Hugs}/libraries/:{Hugs}/oldlib +G +L"test.c" Test.hs +L"-v" If you're using gcc, this will produce about 50 lines of output which will start with something like: Reading specs from /usr/lib/gcc-lib/i386-linux/3.2.3/specs which says that I use gcc 3.2.3. If you're using another compiler, the flag may be --version or -h or whatever. -- Alastair Reid alastair(a)reid-consulting-uk.ltd.uk Reid Consulting (UK) Limited http://www.reid-consulting-uk.ltd.uk/alastair/

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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 26 Apr '03

26 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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Vietnam - Hanoi Trade and Technology Transferring Company
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

Dear sir or madam We are an international trader, we export and import commodities in Hanoi, the capital of Vietnam. We know your address on Internet, we would like to know the detail information of the commodities you need, we can supply all Vietnamese products or the commodities from the thirth country with competitive price, also could you inform us the products which you export? It is easy for us whenever we have requirements that correspond with your company. Looking forward to hearing you Wishes for further co-operation Chaiman General Director- Engineer Mr. Le Khac Triet contact us: Hanoi Trade and Technology Transferring Company (HATETRA CO .,LTD) Address:No 918, 1A Block, Linh Dam Peninsula,Thanh Tri Dist, Hanoi Vietnam. Tel : 0084-4-6412714 / 6412334 - Fax : 0084-4-6412714 Email: exhibition(a)hn.vnn.vn Web : www.iex-exhibition.com.vn

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Hugs for Windows 32 - fatal error
by Nick Blower 23 Apr '03

23 Apr '03

Hi, I've used WinHugs for my functional programming courses whilst at University successfully under Windows 98, however upon recently upgrading to Windows 2000 I've hit a problem! I have to enable the extension for my current piece of coursework, so I go to the command line and when I've reached the appropriate directory I type winhugs -98, the GUI then starts to load but I get a fatal error "unable to load prelude" and the interface prints an error: "ERROR - Illegal character escape sequence". Its weird because hugs still work fine and loads prelude, so it is there but for some reason WinHugs has a problem, even when loading it without the extensions. I'm I doing something stupid or do you have any ideas? Many Thanks Nick Blower

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ambiguity problem
by Martin Sulzmann 22 Apr '03

22 Apr '03

Hi, I'm using -- Hugs Version February 2001. hugs -98 reports ambiguity for the following program class Bar a b | a -> b where bar :: a -> b class Foo a b where foo :: Bar b c => a -> b Ambiguous type signature in class declaration *** ambiguous type : (Foo a b, Bar b c) => a -> b *** assigned to : foo This strange cause the functional dependency should uniquely determine c! Suprisingly, class Bar a b | a -> b where bar :: a -> b class Foo a b -- ok f :: (Foo a b, Bar b c) => a->b f = undefined is accepted. This seems like a bug. Martin

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the message
by hnmlnjbsca＠hotmail.com 21 Apr '03

21 Apr '03

Here is the Message: http://www.themeaning.info You won't receive messages anymore.

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Hugs98 Nov 2002 documentation glitch
by dhw＠thedance.net 21 Apr '03

21 Apr '03

The Nov 2002 implementation of Hugs says it implements a particular version of the Haskell FFI draft (probably 0.7 but I'm not in a position to check right this moment) and gives a URL in Australia as the only reference as to what this FFI version contains. Unfortunately, the URL in question now contains only the subsequent (probably 0.8) version of the FFI, so Hugs users are left with no documentation as to what the current version actually implements. The latter would be better included either with Hugs or at least on the same site, so that consistency between documentation and implementation would be under your control rather than someone else's. -David

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I got the graphics package to compile with macosx
by Hisashi T Fujinaka 20 Apr '03

20 Apr '03

So do I submit the patches (both lines :) )? I've done terrible things to the makefile, so I'd have to clean it up. -- Hisashi T Fujinaka - htodd(a)twofifty.com BSEE (6/86) + BSChem (3/95) + BAEnglish (8/95) + $2.50 = mocha latte

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