December 2001 - Hugs-Bugs

Re:
by Bastian Venthur 14 Dec '01

14 Dec '01

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Another test release
by Johan Nordlander 13 Dec '01

13 Dec '01

MacOS X users might want to try this stuffed installer package: http://cvs.haskell.org/Hugs/downloads/hugs98-Dec2001.pkg.sit -- Johan

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more Test releases
by Jeffrey R Lewis 13 Dec '01

13 Dec '01

There is a RedHat 7.2 rpm available for testing at: http://cvs.haskell.org/Hugs/downloads/hugs98-Dec2001pre1-1.i386.rpm http://cvs.haskell.org/Hugs/downloads/hugs98-Dec2001pre1-1.src.rpm --Jeff

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modules & functional dependencies?
by Iavor S. Diatchki 13 Dec '01

13 Dec '01

hi i seem to have stumbled upon a bug which somehow seems to be realted to the module system and functional dependencies. attached are four files (sorry about that, but it seems to happen when the class and instance are in different modules), 2 files per example. when Bug1 is loaded, no error is reported (although it should have been). if i edit the file (say just add a blank line) using the :e feature, then an error is reported, but seems like the wrong error - it says ERROR "Bug1.hs":6 - Illegal type in class constraint while if i just move the class to the same module, i get the correct error ERROR "Bug1.hs":8 - Undefined type variable "t'" (GHC comes up with this same error) when Bug2 is loaded i get the error: INTERNAL ERROR: inheritFundeps - predicate failed to match it's own head! although these messages dont seem related it seems like their cause is common. i am using the vesrion of hugs from the CVS from about 2 weeks ago (doesnt seem to have a number it just says YYMMDD) bye iavor

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Correction
by The Loop Newsletter 13 Dec '01

13 Dec '01

Correction * --- * --- * --- * --- * --- * --- * * --- * --- * --- * --- * --- * --- * Apologies, Last night a version of The Loop Newsletter was erroneously sent to a few of our subscribers with the subject title "Buy One Get One Free & Free Crystal Method CD at Karmaloop.com." The correct subject title should have read "Rave News & Party Listings from The Loop." We apologize for any inconvenience this misinformation may have caused. We hope you all have a safe and happy holiday season. Best Wishes, The Loop Newsletter ------------------------------------------------ email: karmaloop3(a)roving.com voice: 617-859-1920 web: http://www.karmaloop.com ------------------------------------------------ This email has been sent to hugs-bugs(a)haskell.org at your request, by Karmaloop. Visit our Subscription Center to edit your interests or unsubscribe. http://ccprod.roving.com/roving/d.jsp?p=oo&m=idebpce6&ea=hugs-bugs@haskell.… View our privacy policy: http://ccprod.roving.com/roving/CCPrivacyPolicy.jsp Powered by Constant Contact(R) www.constantcontact.com

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fixST bug in win32.
by Ulf Norell 13 Dec '01

13 Dec '01

Hi. Short story ----------- fixST does not work in Win32 implementation. Hugs version ------------ I installed hugs from the Windows Installer package found at http://www.cse.ogi.edu/PacSoft/projects/Hugs/downloads/hugs98-Feb2001.msi The same problem seems to be present also in the February 2000 release. Specs ----- I am running Windows 2000 Professional (Service Pack 2) on an Athlon Thunderbird machine. Details ------- When using (strict) ST i get the following: ST> runST (fixST (\_ -> return 1)) Show_default_show (Make.Show (Show_default_show (Make.Show ({Interrupted!} ST> $$ () ST> $$ Program error: {_Gc Black Hole} ST> $$ () ST> $$ () ST> $$ 1 ST> $$ Unexpected signal C:\Source\Haskell> It is also possible to get a control stack overflow. Another fascinating example is the following: funny = do ones <- fixST (\xs -> return (1:xs)) return (take 10 ones) Main> runST funny Program error: Prelude.take: negative argument Main> After doing this a few times you get an Unexpected signal. The LazyST module is a little more well-behaved (?). Instead of the unexpected signal you get control stack overflow in the first example, and the second example always gives the program error. If you define the above examples as functions (non-updatable) test1 _ = fixST (\_ -> return 1) funny _ = do xs <- fixST (\xs -> return (1:xs)) return (take 10 xs) Main> runST (test1 ()) 1 Main> runST (funny ()) Program error: Prelude.take: negative argument The first example works while the second still gives an error. Now (of course) you get the same result every time. If you redefine funny using ($) in the fixST application it works a little better: funny' _ = do xs <- fixST $ \xs -> return (1:xs) return (take 10 xs) Main> runST (funny' ()) [1 Program error: Prelude.take: negative argument Best Regards Ulf Norell /----------------\ /-----------------------\ ( Ulf Norell | 031-18 68 74 ) ( Uppstigen 108-21 | 073-676 40 54 ) ( 412 80 Göteborg | d98ulf(a)dtek.chalmers.se ) \----------------/ \-----------------------/

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Buy One Get One Free & Free Crystal Method CD at Karmaloop.com
by The Loop Newsletter 13 Dec '01

13 Dec '01

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Incorrect syntax errors
by Ian Lynagh 11 Dec '01

11 Dec '01

Hi guys, With the module { foo = 5 } I get ERROR tt.hs:2 - Syntax error in input (unexpected `{', possibly due to bad layout) and with the module module Foo where { foo = 5 bar = 6 } ERROR tt.hs:4 - Syntax error in definition (unexpected `=') Thanks Ian

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hugs
by james dickinson 11 Dec '01

11 Dec '01

Hello, my problem is not really a bug at all, but is still a problem. I am trying to complete a university project due in soon and to do this i need to get hugs working on sun's solaris OS, which I'm not really used to. I have used the UNIX instructions given with the install package, but it doesn't work. After typing ./configure , all the comments say "no" and then there's a line saying some prefix can't be found. It then doesn't do anything when I type make install - it doesn't understand. I would really appreciate some help - or if you could recommend someone who can help. Thankyou, James Dickinson. __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com

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RE: modules & functional dependencies?
by Simon Peyton-Jones 11 Dec '01

11 Dec '01

Just for info, GHC currently disallows a class decl like class Foo a b => Baz b where ... on the grounds that 'a' is isn't mentioned in the 'Baz b' part. Arguably, if Foo has a FD b->a then it should be OK. But currently it's rejected. Simon | -----Original Message----- | From: Iavor S. Diatchki [mailto:diatchki@cse.ogi.edu] | Sent: 10 December 2001 23:19 | To: hugs-bugs(a)haskell.org | Subject: modules & functional dependencies? | | | hi | | i seem to have stumbled upon a bug which somehow seems to be | realted to | the module system and functional dependencies. attached are | four files (sorry about that, but it seems to happen when the | class and instance are in | different modules), 2 files per example. | | when Bug1 is loaded, no error is reported (although it should | have been). if i edit the file (say just add a blank line) | using the :e feature, then an | error is reported, but seems like the wrong error - it says | ERROR "Bug1.hs":6 - Illegal type in class constraint while if | i just move the class to the same module, i get the correct | error ERROR "Bug1.hs":8 - Undefined type variable "t'" (GHC | comes up with this same error) | | when Bug2 is loaded i get the error: | INTERNAL ERROR: inheritFundeps - predicate failed to match | it's own head! | | although these messages dont seem related it seems like their | cause is | common. i am using the vesrion of hugs from the CVS from | about 2 weeks ago (doesnt seem to have a number it just says YYMMDD) | | bye | iavor | |

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