November 2000 - Hugs-Bugs

OSX
by Michel Schellekens 25 Oct '02

25 Oct '02

After downloading the OSX version, and typing "hugs" to start up the language, I obtain the following error: [schellekens:~] mpcs% hugs dyld: hugs can't open library: /usr/lib/libncurses.5.dylib (No such file or directory, errno = 2) Any suggestions? Michel.

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Quick question
by Micha Pringle 04 Dec '00

04 Dec '00

I'd like to make a simple infix expression evaluator. It should be able to support simple functions, such as *, +, -,/ as well as simpl recursion. That is, if I define G <- 19 H <- G + 6 evaluate G shoulr return 25 Anyone know a good webpage for some info? cheers, Micha __________________________________________ Micha Pringle Systems Development TISCOM Systems Albisriederstrasse 365 CH-8047 Zurich Switzerland Tel: +41 (0)1 405 60 80 Fax: +41 (0)1 405 60 99 e-mail: micha.pringle(a)tiscom.com __________________________________________

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ERROR: Too many ForeignObjs open
by Koen Claessen 29 Nov '00

29 Nov '00

Hi, Playing around with H/Direct, I often get the error: ERROR: Too many ForeignObjs open I think that in my case, a simple garbage collect would get rid of a lot of these foreign objects. Is this true? In other words: would a garbage collect just before this error is generated help? Regards, Koen. -- Koen Claessen http://www.cs.chalmers.se/~koen phone:+46-31-772 5424 mailto:koen@cs.chalmers.se ----------------------------------------------------- Chalmers University of Technology, Gothenburg, Sweden

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unsubscribe hugs-bugs
by Wooseok Yang 25 Nov '00

25 Nov '00

unsubscribe hugs-bugs

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Bug in Dependent Parameters?
by Koen Claessen 23 Nov '00

23 Nov '00

Hi, I am running "hugs -98" on Solaris, version February 2000. I get the following strange error message: >>> Main> generalZipWith (+) [1,2,3] [3,4,5] :: [Int] ERROR: Cannot justify constraints in type annotation *** Expression : generalZipWith (+) [1,2,3] [3,4,5] *** Type : [Int] *** Given context : () *** Constraints : (Num Int, Num Int, Num Int, Num Int, Num Int, Num Int, Num Int) <<< Apart from looking at the program that generates this message, isn't it a bit strange that it complains about unjustified constraints of the form "Num Int"? How can this constraint be unjustified?? When I write all the types explicitly I get the correct answer: >>> Main> generalZipWith (+) ([1,2,3]::[Int]) ([3,4,5]::[Int]) :: [Int] [4,6,8] <<< The program generating this is attached. Regards, Koen. -- Koen Claessen http://www.cs.chalmers.se/~koen phone:+46-31-772 5424 mailto:koen@cs.chalmers.se ----------------------------------------------------- Chalmers University of Technology, Gothenburg, Sweden

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Invalid Page Fault
by Steinitz, Dominic J 20 Nov '00

20 Nov '00

---------------------- Forwarded by Dominic Steinitz/HEATHROW/BRITISH AIRWAYS/GB on 20/11/2000 09:18 --------------------------- Dominic Steinitz 19/11/2000 00:27 To: hugs-bugs cc: bcc: Subject: Invalid Page Fault HUGS caused an invalid page fault in module HUGS.EXE at 0137:00406d72. Registers: EAX=fffd54da CS=0137 EIP=00406d72 EFLGS=00010297 EBX=00000000 SS=013f ESP=006e0000 EBP=007dfbd0 ECX=fffc2f70 DS=013f ESI=fffd54f6 FS=0e17 EDX=00000200 ES=013f EDI=00c14250 GS=0000 Bytes at CS:EIP: 50 e8 e8 00 00 00 8b 15 04 ef 4c 00 83 c4 04 89 Stack dump: 00000020 fffd551a 00406f07 00000002 fffd551e 00406edf fffd551a 00c14250 fffd5524 00406d78 fffd551e 00000040 fffd5539 00406f07 00000004 fffd553d Here's the session details. c 2 works ok as below but c 80 causes the page fault. 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\parser\hugsprob.hs": Reading file "C:\My Documents\functional\parser\UU_Parsing.hs": Reading file "C:\My Documents\functional\parser\hugsprob.hs": Hugs session for: C:\HUGS98\lib\Prelude.hs C:\My Documents\functional\parser\UU_Parsing.hs C:\My Documents\functional\parser\hugsprob.hs Type :? for help Main> c 2 ([Entry{dN=DN{eN=Just (EmployeeNumber "3729"),ou=Ou "People",o=Organisation "bap lc.com",dc=DC "pathway"},unitHierarchyCode=Just (UnitHierarchyCode "BAIOMH"),tel ephoneExtnNumber=Just (TelephoneExtnNumber "27635"),ou'=Ou "People",manager=Just (Manager DN{eN=Just (EmployeeNumber "652413"),ou=Ou "People",o=Organisation "ba plc.com",dc=DC "pathway"}),objectClasses=[ObjectClass "top",ObjectClass "person" ,ObjectClass "organizationalPerson",ObjectClass "inetOrgPerson",ObjectClass "pth wyOrgPerson"]},Entry{dN=DN{eN=Just (EmployeeNumber "3729"),ou=Ou "People",o=Orga nisation "baplc.com",dc=DC "pathway"},unitHierarchyCode=Just (UnitHierarchyCode "BAIOMH"),telephoneExtnNumber=Just (TelephoneExtnNumber "27635"),ou'=Ou "People" ,manager=Just (Manager DN{eN=Just (EmployeeNumber "652413"),ou=Ou "People",o=Org anisation "baplc.com",dc=DC "pathway"}),objectClasses=[ObjectClass "top",ObjectC lass "person",ObjectClass "organizationalPerson",ObjectClass "inetOrgPerson",Obj ectClass "pthwyOrgPerson"]}],"",) (62505 reductions, 124185 cells) ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com ------------------------------------------------------------------------------------------------- 21st century air travel http://www.britishairways.com

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(no subject)
by Riaz Ahmad 18 Nov '00

18 Nov '00

Hello I've been trying to download the Feb2000 versions for Win32 of Hugs - which is OK. When I unzip and run, the Hugs window opens with a fatal error warning saying "could not load prelude", and subsequently crashes. Any ideas on how I can overcome this and get Hugs to run properly. I'd welcome any assistance/comments. Thanks Riaz Ahmad

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Win32 library on Hugs download page is out of date
by Alastair Reid 17 Nov '00

17 Nov '00

The Win32 library on the Hugs download page http://www.cse.ogi.edu/PacSoft/projects/Hugs/pages/downloading.htm is out of date and bears little resemblance to that in the CVS repository. This is causing repeated problems for users of the graphics library. A more current version can be found in http://haskell.org/graphics/downloads/Win32.zip Can you please, please, please, replace the old copy with the above? (Or build your own from the CVS tree. Or just delete the link.) Thanks, -- Alastair Reid reid(a)cs.utah.edu http://www.cs.utah.edu/~reid/

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Extra uinfo RE: Quick question
by Micha Pringle 15 Nov '00

15 Nov '00

I want a web page that has some decent information because I may expand on my trivial implementation to support additional functions. Thus I want to start with a good design that can be generalized (which is why I am asking). Sorry for any confusion. I'd like to make a simple infix expression evaluator. It should be able to support simple functions, such as *, +, -,/ as well as simple recursion. That is, if I define G <- 19 H <- G + 6 evaluate G should return 25 Anyone know a good webpage for some info? cheers, Micha __________________________________________ Micha Pringle Systems Development TISCOM Systems Albisriederstrasse 365 CH-8047 Zurich Switzerland Tel: +41 (0)1 405 60 80 Fax: +41 (0)1 405 60 99 e-mail: micha.pringle(a)tiscom.com __________________________________________ _______________________________________________ Hugs-Bugs mailing list Hugs-Bugs(a)haskell.org http://www.haskell.org/mailman/listinfo/hugs-bugs

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increasing control stack size?
by Dima Pasechnik 10 Nov '00

10 Nov '00

As I was getting "Control stack overflow" while attempting to generate large (>1MB) data files using Hugs, I recompiled Hugs with 10-fold increased value of the corresponding parameter (was 16K). Then I was able to do the necessary computations. However, I wonder if it was safe to so, i.e. that this change didn't break functionality of the Hugs system. Hugs documentation sounds as if one gets "Control stack overflow" then it surely must be an infinite recursion; while in my case it's just concatenation of long (>20K) strings. I guess it would've been nice if documentation said something more about that, and explained ways of increasing stack size. IMHO, some internal Hugs part uses the stack (thus, something that is not controllable by the command line options) for data that ought to be held in the heap (whose size is controllable by command line options)... Best regards, Dmitrii Pasechnik http://ssor.twi.tudelft.nl/~dima/

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