- Hugs-Bugs - Haskell.org

Editor problem
by David Sun 31 May '01

31 May '01

Hi, I tried to set the editor in hugs as vim using the string :set -Evim but hugs does not remember the setting after I exit it and I have to set the editor everytime I start hugs. This is very annoying, I dunno if this is a bug or not. I have tried the same with root rights, but the same output occurred. I am running Mandrake Linux Version 8.0 on a Pentium III 500 box. Yours sincerely, David Sun (The) University of Melbourne Melbourne, Australia

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Re: IO Errors
by Sigbjorn Finne 29 May '01

29 May '01

Dominic J Steinitz Dominic.J.Steinitz(a)BritishAirways.com writes: > > Can anyone tell me why this behaves as it does? In Hugs, I get > > C:\My Documents\functional\ldapsck1\buffer.hs > Main> main > > Illegal operation > (561 reductions, 1029 cells) > ..program elided... > The reason for the behaviour you're seeing is that Hugs doesn't report you reading past the end of the file as an EOF error (Hugs never reports EOF errors, but maps them to illegal ops instead). So, to have it work with both Hugs and GHC, you need to change the 'Left' branch of the case expression in 'main' from Left e -> if isEOFError e then do .... else do ... to Left e -> if isEOFError e || isIllegalOperation e then do .... else do ... hth --sigbjorn

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IO Errors
by Steinitz, Dominic J 25 May '01

25 May '01

ghc behaves as expected so I assume this is a bug. ---------------------- Forwarded by Dominic Steinitz/HEATHROW/BRITISH AIRWAYS/GB on 25/05/2001 16:56 --------------------------- Dominic Steinitz 25/05/2001 11:30 To: haskell cc: bcc: Subject: IO Errors Can anyone tell me why this behaves as it does? In Hugs, I get C:\My Documents\functional\ldapsck1\buffer.hs Main> main Illegal operation (561 reductions, 1029 cells) Main> If the input file is the one line: 1234567812345678 the output file is: Starting logging 1234567812345678 Error In ghc, the program hangs without even creating a file. Dominic import IO main :: IO () main = do ofh <- openFile "log.txt" WriteMode logMessage ofh "Starting logging" ifh <- openFile "tst.txt" ReadMode let loop = do b <- try (getBuffer ifh 16) case b of Right msg -> do logMessage ofh msg loop Left e -> if isEOFError e then do logMessage ofh "Finishing logging" hClose ofh else do logMessage ofh "Error" ioError e in loop logMessage :: Handle -> String -> IO () logMessage hd msg = do hPutStrLn hd msg hFlush hd getBuffer :: Handle -> Int -> IO String getBuffer h n = if (n <= 0) then return "" else do c <- hGetChar h cs <- getBuffer h (n-1) return (c:cs) ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com

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(no subject)
by Doug McIlroy 17 May '01

17 May '01

During a vanilla install of hugs 1.4 on Linux 2.2.17, using the unix configure procedure, I encountered the following anomalies. They may be moot, since 1.4 is not the latest version of hugs. Loader flag -ldl had to be added to Makefile in order to get dlopen from the library. snprintf and vsnprintf are in stdio.h, but HAVE_SNPRINTF and HAVE_VSNPRINTF were missing from config.h, which resulted in conflicting declarations. I added the two #defines. The datatype of fpos_t is a struct, not an integral type. I got around it by 3 small (unportable) changes to iomonad.c. Make install bombed because I did not own $(bindir) and $(libdir) and thus could not chmod them. Removing install -d for these directories fixed the problem. Doug McIlroy

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(no subject)
by e.g.stevens 17 May '01

17 May '01

Dear Sir/Madam There seems to be a spelling error at your web site on the web page http://haskell.cs.yale.edu/hugs/. The top section seems to say "Dowload the full release of Hugs 98 here". Obviously you mean Download instead. I am using Internet Explorer version 5.5, if this would make any diference. Regards Kent

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Function with Two Types?
by Steinitz, Dominic J 16 May '01

16 May '01

I wouldn't expect Hugs to give me two different types for the same function depending on what I'd typed in at the command line. Dominic. __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-1999 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Report bugs to: hugs-bugs(a)haskell.org || || Version: February 2000 _________________________________________ Hugs mode: Restart with command line option +98 for Haskell 98 mode Reading file "C:\HUGS98\lib\Prelude.hs": Reading file "C:\My Documents\functional\x690e\BEStc2.hs": Hugs session for: C:\HUGS98\lib\Prelude.hs C:\My Documents\functional\x690e\BEStc2.hs Type :? for help Main> :t unBESNULL unBESNULL :: BESable ([Char] -> Int) => BES -> NULL Main> :t (Primitive' 5 NULL) Primitive' 5 NULL :: BES Main> :t unBESNULL unBESNULL :: BES -> NULL Main> unBESNULL (Primitive' 5 NULL) ERROR: Unresolved overloading *** Type : BESable (Int -> NULL -> BES) => NULL *** Expression : unBESNULL (Primitive' 5 NULL) Main> :t unBESNULL unBESNULL :: BESable (Int -> NULL -> BES) => BES -> NULL Main> :t (Primitive' 5 NULL) Primitive' 5 NULL :: BES Main> :t unBESNULL unBESNULL :: BES -> NULL ============================== data NULL = NULL data BES = forall a . (UnBESable a) => Primitive' Int a | Constructed' Int [BES] class BESable a where bes :: a -> BES unbes :: UnBESable b => a -> b class UnBESable b where doNULL :: NULL -> b doInt :: Int -> b instance BESable NULL where bes = Primitive' 5 unbes = doNULL instance UnBESable NULL where doNULL NULL = NULL doInt x = error "Can't cast" instance BESable Int where bes = Primitive' 2 unbes = doInt instance UnBESable Int where doNULL x = error "Can't cast" doInt x = x unBESNULL (Primitive' 5 x) = (unbes x)::NULL unBESInt (Primitive' 2 x) = (unbes x)::Int ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com

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Re: Integers to Ints
by Steinitz, Dominic J 16 May '01

16 May '01

The consensus is that this is a bug. ---------------------- Forwarded by Dominic Steinitz/HEATHROW/BRITISH AIRWAYS/GB on 16/05/2001 13:48 --------------------------- rjchaaft(a)cs.uu.nl on 16/05/2001 11:54:00 To: haskell cc: bcc: Dominic Steinitz Subject: Re: Integers to Ints Hello, >Can someone explain the following behaviour? Or is it a bug in hugs? I can not explain it. Rather strange is that even this is allowed: (fromIntegral (toInteger (minBound::Int) + 1) -1) :: Int yielding -2147483648 > > (fromIntegral(toInteger(minBound::Int))::Int) > >Program error: {primIntegerToInt (-2147483648)} >(15 reductions, 70 cells) > > > (fromIntegral(toInteger((minBound::Int)+1))::Int) >-2147483647 >(21 reductions, 29 cells) > > > minBound::Int >-2147483648 >(9 reductions, 19 cells) _______________________________________________ Haskell mailing list Haskell(a)haskell.org http://www.haskell.org/mailman/listinfo/haskell ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com

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Where is Time.hs librarie?
by Alfonso Acosta 15 May '01

15 May '01

Hi: This mail is not really a bug report, but I didn't know who to mail to ask this. I use hugs together with Haskore and i've just downloaded the "Standart Libraries" manual from www.haskell.org. There I have read that exists a librarie called Time, which should be very usefull. The point is that I can't find that librarie in hugs. Why it isn't implemented? Thanks a lot: Alfonso Acosta _______________________________________________________________ Do You Yahoo!? Yahoo! Messenger: Comunicación instantánea gratis con tu gente - http://messenger.yahoo.es

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A Little Learning is a Dangerous Thing !
by Iain McNaughton 15 May '01

15 May '01

Hi ! I'm not quite sure if this is the right place to go for help with Hugs, but I'll give it try... Situation is this: I was running some scripts in WinHugs, and everything was running happily. I then attempted to add ( using ":a" ) a new script, and received the following error message: "Program code storage space exhausted". Well, I thought to myself ( fool that I evidently was ! ) that there must be a parameter somewhere in Hugs that I can set to increase the program storage space, so I set out to find it. Unfortunately, having tweaked a couple of numbers ( heap size was one, I think, and the other was something similar-looking ), and restarted Hugs, I now have the following error as I start WinHugs: "Cannot allocate heap storage". Immediately after this error message within the WinHugs interface, a pop-up box appears, containing the message: "Fatal Error: unable to load prelude". At that point, WinHugs disappears. I've tried uninstalling Hugs, and completely re-installing it, but that doesn't appear to do any good. So, I've clearly f*cked up somewhere, but I'm not sure where. Any comments or advice would be greatly appreciated. I understand that this might not count as a bug in its own right, as the software is presumably behaving in a perfectly sensible way; rather, the bug is in me, the over-adventurous user. However, though I've read all the documentation, I'm stuck, and would appreciate any help or assistance you can give me. If you want to flame me for gross stupidity, that would be fine, too ! Thanks for your ( hoped for ) help. Sincerely, Iain McNaughton. -- Iain McNaughton

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stack overflow
by Gustav Andersson 14 May '01

14 May '01

Hello, I think I've found a bug in Hugs 98 (February 2001 version). Hugs crashes (Stack Overflow) whenever I try to execute the following piece of code (well I know, the code is not very useful, it came from a typo): ---------------------- f :: Int -> Int -> Int f a b = f (f' a b) b f':: Int -> Int -> Int f' a b = a+b ---------------------- Then i Hugs execute f with two arbitary integers ex. > f 2 2 Hugs Version February 2001 will crash with the following error (piece from drwatson's log-file in Windows 2000). Application exception occurred: App: (pid=996) When: 2001-05-14 @ 19:01:03.010 Exception number: c00000fd (stack overflow) I've also tried the program under hugs in unix (I don't know the version, it didn't have the function ":version") Stack overflow: pid 9856, proc hugs, addr 0x11fdfffe0, pc 0x12001c124 Segmentation fault I hope this will help you with the next version of hugs. Yours Sincerly Gustav Andersson

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