December 2001 - 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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hugs98-Dec2001.tar.gz on FreeBSD-4.4
by Wilhelm B. Kloke 08 Jan '02

08 Jan '02

There is a small glitch in the configuration from source, and the binaries,too. When I tried to install graphics-2.0.4.src.tar.gz, I had to change LEADING_UNDERSCORE to undefined manually in config.h and recompile. Otherwise hugs failed to find _initModule. -- Dipl.-Math. Wilhelm Bernhard Kloke Institut fuer Arbeitsphysiologie an der Universitaet Dortmund Ardeystrasse 67, D-44139 Dortmund, Tel. 0231-1084-257

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Running xemacs from Hugs under Windows
by Philip Wadler 02 Jan '02

02 Jan '02

Running Hugs98 under Win2k (December 2001 version), I can invoke the xemacs editor with > :! xemacs.lnk +10 c:/prog/hugs/example.hs Then I set Editor setting : -E"xemacs.lnk +%d %s" But if I then type > :e it reports Warning: Editor terminated abnormally Any idea as to what might be wrong or how to fix it? Best wishes for the holiday season, -- P ----------------------------------------------------------------------- Philip Wadler wadler(a)avaya.com Avaya Labs http://www.research.avayalabs.com/user/wadler/ 233 Mount Airy Road, room 2C05 office: +1 908 696 5137 Basking Ridge, NJ 07920 fax: +1 908 696 5402 USA home: +1 908 626 9252 cell: +1 908 872 4436 ----------------------------------------------------------------------- "When a Mathematical Reasoning can be had it's as great a folly to make use of any other, as to grope for a thing in the dark, when you have a Candle standing by you." -- John Arbuthnot, 1692 -----------------------------------------------------------------------

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Problem with installer under Windows 98 SE
by jasa 28 Dec '01

28 Dec '01

Hi, Thank you for providing the Haskell (Hugs) interpreter. I have the windows installer 'installed' in my machine. I tried to install the 'hugs98-Dec2001.msi' package, and windows returned me a nag window saying: 'It wasn't possible to open this installation package. Contact the provider of the package to see if it is a valid package,...' Has anyone already reported the problem until now? Note that, for instance, I installed the ActivePerl msi package without problems. Thanks in advance, Best Regards, and a Happy New Year! J. Augusto

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hugs98-Dec2001 on AIX
by James B. White III (Trey) 28 Dec '01

28 Dec '01

Hugs debuggers, I built the December 2001 distribution of Hugs on AIX using IBM's C compiler, and it required a few changes to the distribution to work. System: AIX 4.3.3 XL C 5.0.2 To build without error, I had to change the value of "CFLAGS". I could not do this with "configure" because it was hardwired to set "CFLAGS = -g". I modified "configure" as follows, commenting out the hardwired values. % diff configure.orig configure 4611,4612c4611,4612 < CFLAGS="-g" < OPTFLAGS="-O2" --- > #CFLAGS="-g" > #OPTFLAGS="-O2" Then I configured with the following command. The "-qalloca" is required. CC=cc CFLAGS="-g -qalloca" OPTFLAGS="-O -qmaxmem=-1" LDFLAGS="-bmaxdata:0x70000000" configure --prefix=$MYPREFIX The resulting Hugs executable hung while parsing the Prelude. (The distribution from February 2001 did not have this problem.) I eventually discovered the root of the problem in "input.c". I made the following change to fix it. % diff input.c.orig input.c 516c516 < if (lineBuffer[lineLength] == EOF) --- > if (lineBuffer[lineLength] == (char)EOF) With AIX, "EOF" is a signed integer of value -1, but characters are unsigned. When the character variable "lineBuffer[lineLength]" is set to "EOF", its value becomes 255. Since 255 doesn't equal -1, the "if" statement is never true. Casting "EOF" to a character give it the needed value of 255. Section 2.7 of K&R's C book, 2nd edition, describes the machine dependence of the automatic conversion of characters "up" to signed integers. The explicit "downward" cast avoids this machine dependence. I humbly suggest incorporating this change to "input.c" in future Hugs distributions. -- James B. White III (Trey) Center for Computational Sciences Oak Ridge National Laboratory whitejbiii(a)ornl.gov

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25 Dec '01

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Re:
by Obec Ka�ava 25 Dec '01

25 Dec '01

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com library
by Michael Vorin 20 Dec '01

20 Dec '01

I take it that by not including the com library in the december release of hugs there is a tacit acknowledgement that it dosn't work with it ? I was trying to get HaskellDB to work with the Feb01 release of hugs then the dec01 release. In either case I could not get it to work with the com library released with Feb01 release. I also tried the com library released with HaskellDirect - together with hugs Feb01, hugs Dec01 - still no luck - error was memory reference error Digging back into the past, the activeX library released with HaskellScript (a long time ago) together with either Hugs Feb01 or Hugs Dec01 worked. tried hugs Nov 99 with com library from Haskell direct - worked tried hugs Nov 99 with com library from Hugs Feb01 - worked Test ---- The test that was run was to load the HaskellDB sample and run test showNames names Conclusion ---------- It appears there is a problem in the interaction of Hugs Dec 01 and the com library - this problem seems to have been introduced with hugs Feb01 _________________________________________________________________ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com

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Bug in context reduction with overlapping instances
by John Hughes 20 Dec '01

20 Dec '01

Here's a small program defining a collection class: ------------------ class Sat a where dict :: a data EqD a = EqD {eq :: a->a->Bool} instance Sat (EqD a) => Eq a where (==) = eq dict class Collection c cxt | c -> cxt where empty :: Sat (cxt a) => c a single :: Sat (cxt a) => a -> c a union :: Sat (cxt a) => c a -> c a -> c a member :: Sat (cxt a) => a -> c a -> Bool instance Collection [] EqD where empty = [] single x = [x] union = (++) member = elem ------------------ Loading this program with overlapping instances turned on produces the error message: Type checking ERROR "C:\windows\Skrivbord\HugsBug.hs":24 - Cannot justify constraints in instance member binding *** Expression : member *** Type : (Collection [] EqD, Sat (EqD a)) => a -> [a] -> Bool *** Given context : (Collection [] EqD, Sat (EqD a)) *** Constraints : Eq a Very strange, given the instance declaration instance Sat (EqD a) => Eq a The behaviour is the same in the February and December 2001 versions. John Hughes

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patch for `interact'
by Malcolm Wallace 20 Dec '01

20 Dec '01

There is a bug in Dec2001 Hugs (and earlier releases too) which causes the Prelude function `interact' to behave unexpectedly - the user's input is not echoed to the screen as she types it. A patch is attached which solves the problem. Regards, Malcolm --- src/iomonad.c Tue Dec 11 00:54:51 2001 +++ src/iomonad.c.patched Tue Dec 18 10:53:47 2001 @@ -844,6 +844,7 @@ HandleArg(h,1); if (handles[h].hmode&HSEMICLOSED) { /* read requires semi-closed handle*/ Int c = (h==HSTDIN ? readTerminalChar() : getc(handles[h].hfp)); + if (h==HSTDIN) putchar(c); if (c!=EOF && c>=0 && c<NUM_CHARS) { updapRoot(consChar(c),ap(nameHreader,primArg(1))); return;

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