- Hugs-Users - Haskell.org

WinHelp file
by John.Velman＠HSC.com 11 Apr '01

11 Apr '01

I previously compiled the hugs sources with Cygwin using the unix process. It must have compiled out of the box (since I don't know enough to have done any very complicated porting), and works fine in the Cygwin environment from the bash window. For a variety of reasons, I decided I'd see if I can live with native windows versions of Haskell. So.. I downloaded the win32exes.zip and hugs.hlp (linked from WinHelp on the Hugs website). I copied my docs, lib, icons, demos directories from my source directory. I certainly haven't tried anything exotic yet, but both hugs and winhugs run and load the prelude, and seem happy enough side by side (so to speak) with their un*xis cousin I compiled with Cygwin. However, when I hit 'help' on the winhugs menue, (or view it from explorer) I get a message that this is not an ms help file, or is corrupted. Also, none of the other items on the help menu work (not surprisingly, considering the contents of my docs directory). Is there somewhere I can get the docs that belong here without installing Microsoft installer? By the way, winhugs is really very nice. I'm glad I installed it. I may well end up using winhugs instead of "Cygwin hugs" in much the same way that I use the native windows vim (with gvim) instead of the Cygwin vim. Best, John Velman john.velman(a)hsc.com john.r.velman(a)boeing.com I

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cannot build superclass instance
by pablocardenal＠laplatavive.com 06 Apr '01

06 Apr '01

Hello, where is the error? Tested on Hugs 98 February 2001 in Windows 98 Operating System with options -98 +som =========================================================== >class Result r where > nullR :: r > toList :: Result r' => r -> [r'] instance Result [a] where nullR = [] ----------------------------------------------- >class Result r => SubResult r where > sub :: r >instance SubResult [a] where -- this is the line 22 > sub = [] ----------------------------------------------- if add this line 31, then error in line 22 if remove this line 31, then not error >instance Result String -- this is the line 31 Reading file "..\core\result.lhs": Type checking ERROR ..\core\result.lhs:22 - Cannot build superclass instance *** Instance : SubResult [a] *** Context supplied : () *** Required superclass : Result [a] Obviously if replace line 22 with instance Result [a] => SubResult [a] where -- this is -- the new line 22 no error occurs, but why if remove the line 31 the error not occurs ? In previous version of Hugs (March 1999) this error not occurs Thanks. Pablo de la Hoya Cardenal from Argentina

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Hugs question
by Swee Guan 21 Mar '01

21 Mar '01

I was suppose to find a function mid3 that takes three integers and returns the middle one in terms of size but i cant seem to get it. maybe you can help mid3 :: Int -> Int -> Int -> Int -- mid3 takes three integers and -- returns the middle one in terms of size mid3 x y z = min2 x (max2 y z) please send to swigs01(a)hotmail.com

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Fw: Hugs question
by Swee Guan 20 Mar '01

20 Mar '01

----- Original Message ----- From: Swee Guan To: hugs-users(a)haskell.org Sent: Tuesday, March 20, 2001 5:13 PM Subject: Hugs question I was suppose to find a function mid3 that takes three integers and returns the middle one in terms of size but i cant seem to get it. maybe you can help mid3 :: Int -> Int -> Int -> Int -- mid3 takes three integers and -- returns the middle one in terms of size mid3 x y z = min2 x (max2 y z) please send to swigs01(a)hotmail.com

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Bug? - 'forall' in type/data - decls
by Tobias Haeberlein 19 Mar '01

19 Mar '01

Hi all! Why doesnt Hugs (Version February 2001, run with -98 option) accept the following? - type A = (forall b. b -> b) -> Int yields: "Syntax error in type expression (unexpected keyword "forall") " - data A = B ((forall b. b -> b) -> Int) yields "Syntax error in type expression (unexpected `->')" whereas ghc accepts both... Tobi

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Observe
by andreas.marth＠daimlerchrysler.com 14 Mar '01

14 Mar '01

Hallo! With Hugs98Feb2001 comes a module Observe.lhs (in lib/exts). Is there any documentation available? (I looked into the library documentation http://www.cse.ogi.edu/PacSoft/projects/Hugs/pages/hugsman/libs.html but couldn't find any. Thanks, Andreas

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HUGS98-feb2001 edition
by Swee Guan 14 Mar '01

14 Mar '01

I want to know how to install the hugs programs for windows as i cant seem to get it going plese inform me on how to do this. Please send reply to swigs01(a)hotmail.com thank you

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Re: Is this a bug?
by Johan Nordlander 13 Mar '01

13 Mar '01

Jon Fairbairn wrote: > > I think so. The language grammar requires (if I read it > correctly) that the expr in an aexp of the form (op > expr) have a higher priority than op. > > On Mon, 12 Mar 2001 andreas.marth(a)daimlerchrysler.com wrote: > > So why is (^2*3) not equvalent to \a->a^2*3 ? > > Because it's being parsed as (^(2*3)) when it should be > rejected. > > Jón Yes, this is one of a few known and relatively insignificant differences between Hugs 98 and the Haskell report. See further the Hugs manual, section 9.1: http://www.cse.ogi.edu/PacSoft/projects/Hugs/pages/hugsman/diffs.html All the best, Johan

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Is this a bug?
by andreas.marth＠daimlerchrysler.com 13 Mar '01

13 Mar '01

Hallo! I just wonder why map (^2*3) [1..9] returns [1,64,729,4096,15625,46656,117649,262144,531441] . [i^2*3|i<-[1..9]] return the expected [3,12,27,48,75,108,147,192,243]. And so does map (\a->a^2*3) [1..9]. So why is (^2*3) not equvalent to \a->a^2*3 ? Thanks, Andreas

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FREE Biotech Stock Info! 78
by biotechstox89＠msn.com 12 Mar '01

12 Mar '01

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