March 2007 - Hugs-Users

readline library?
by Iavor Diatchki 28 Mar '07

28 Mar '07

Hello, It seems that the hugs98-plus-Sep2006.tar.gz package from the Hugs website is missing the readline library (System.Console.Readline). Is this by design or did I do something wrong while compiling it? -Iavor

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Improved readline command completion support
by Georg Sauthoff 25 Mar '07

25 Mar '07

Hi, fyi, I wrote a patch that improves the readline command completion support of hugs. It is available at http://hackage.haskell.org/trac/hugs/ticket/61 . I.e.: - added completion of function names and constructors - added completion of command names (:<cmd>) - added completion of module names (e.g. after :browse , etc.) - only do filename completion where it makes sense (e.g. after :load , etc.) - expand use of tilde (~) in filenames (previously it was completed but not recognized by hugs) - read and write the history from/to ~/.hugs_history - make hugs recognize :help Best regards Georg Sauthoff

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64-bit Ints
by unknown＠example.com 24 Mar '07

24 Mar '07

Is there a simple way to build hugs with 64-bit ints instead of 32-bit ints for Int? Thanks, Dave Feustel

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'=' and ':' generate errors
by unknown＠example.com 24 Mar '07

24 Mar '07

running Hugs98 sept 2006 version, on AMD 64-bit OpenBSD 4.0, test :: Int ERROR - Undefined variable "test" size = 12+13 ERROR - Syntax error in input (unexpected `=') These lines are right out of _The Craftf of Functional Programming_, 2nd Edition, which I just received in the mail. Is Hugs98 broken on my system? Thanks, Dave Feustel

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Cannot access the anonymous CVS repository
by Georg Sauthoff 12 Mar '07

12 Mar '07

Hi, I followed http://hackage.haskell.org/trac/hugs/wiki/GettingTheSource, but I get this strange error message: CVSROOT=:pserver:anoncvs@cvs.haskell.org:/cvs cvs login Logging in to :pserver:anoncvs@cvs.haskell.org:2401/cvs CVS password: PAM start error: Critical error - immediate abort Fatal error, aborting. cvs [login aborted]: unrecognized auth response from cvs.haskell.org: pam failed to release authenticator Best regards Georg Sauthoff

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arrowp-0.5
by luc.duponcheel＠accenture.com 09 Mar '07

09 Mar '07

Hi all, ... probably a very stupid question ... here is the content of the arrowp-0.5 README file ---begin--- Various arrow materials: preprocessor a prototype preprocessor translating arrow notation to Haskell. examples some illustrative applications of the preprocessor and libraries. The preprocessor works with GHC. The rest can be used with either Hugs or GHC (>= 5.00). ---end--- Does this mean that the preprocessor cannot be used with Hugs? In other words: can the generated code sometimes not be interpreted by Hugs? (because of subtle language and/or library differences, maybe?) I find this a little bit strange, since GHC has 'native' support for arrows anyway (via -farrows), so why does arrowp exist if it can be used with GHC but not with Hugs? Luc This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, please notify the sender immediately and delete the original. Any other use of the email by you is prohibited.

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Re: [Hugs-users] Old bug hanging around?
by dfeustel＠mindspring.com 07 Mar '07

07 Mar '07

> On Wed, Mar 07, 2007 at 10:54:55PM +0000, Dave(a)haskell.org wrote: > > io f = interact (unlines . f . lines) > > showln = (++ "\n") . show > > > > -- Compute a simple cksum of a file > > > > main = interact $ showln . foldl' k 5381 > > where k h c = h * 33 + ord c > > > > ======== > > > > Hugs> :load chksum.hs > > ERROR "chksum.hs":15 - Unresolved top-level overloading > > *** Binding : showln > > *** Outstanding context : Show b > > > > Text.Printf> > > > > This error has been around for a while. > > Yes, it's a documented divergence from Haskell 98 in the handling of > the Monomorphism Restriction. > > Workarounds are to give an explicit signature for showln, or to tweak > the definition so it's a function: > > showln x = show x ++ "\n" > > (or, better) > > showln x = shows x "\n" That Works. Thanks, Dave

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Old bug hanging around?
by unknown＠example.com 07 Mar '07

07 Mar '07

I got an error on the following short program (which ghc compiles and runs). =========== -- Some unix-like tools written in simple, clean Haskell import Data.List import Data.Char import System.IO import Text.Printf -- First, two helpers io f = interact (unlines . f . lines) showln = (++ "\n") . show -- Compute a simple cksum of a file main = interact $ showln . foldl' k 5381 where k h c = h * 33 + ord c ======== Hugs> :load chksum.hs ERROR "chksum.hs":15 - Unresolved top-level overloading *** Binding : showln *** Outstanding context : Show b Text.Printf> This error has been around for a while. See http://www.arcknowledge.com/gmane.comp.lang.haskell.hugs.bugs/2006-11/msg00… Is there a fix for this problem? Thanks, Dave Feustel

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Re: [Hugs-users] Missing Prelude
by dfeustel＠mindspring.com 06 Mar '07

06 Mar '07

> On Tue, Mar 06, 2007 at 06:21:44PM +0000, Dave(a)haskell.org wrote: > > I replaced installed Hugs and ghc with the newest versions which > > I built myself. ghc works but hugs now exits with the message > > > > __ __ __ __ ____ ___ _________________________________________ > > || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard > > ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2005 > > ||---|| ___|| World Wide Web: http://haskell.org/hugs > > || || Bugs: http://hackage.haskell.org/trac/hugs > > || || Version: September 2006 _________________________________________ > > > > Haskell 98 mode: Restart with command line option -98 to enable extensions > > > > Hugs.Prelude not found on current path: ".:{Home}/lib/hugs/packages/*:/usr/local/lib/hugs/packages/*" > > > > FATAL ERROR: Unable to load prelude implementation > > > > Where does hugs normally find the Hugs.Prelude file? > > With these settings (which are the default), > > /usr/local/lib/hugs/packages/hugsbase/Hugs/Prelude.hs > ls: /usr/local/lib/hugs/packages/hugsbase/Hugs/P*: Permission denied Thanks. Somehow directory /usr/local/lib/hugs had the x permissions removed from group and world which removed my access to Prelude. I restored the permissions and hugs now works again.

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Missing Prelude
by unknown＠example.com 06 Mar '07

06 Mar '07

I replaced installed Hugs and ghc with the newest versions which I built myself. ghc works but hugs now exits with the message __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2005 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Bugs: http://hackage.haskell.org/trac/hugs || || Version: September 2006 _________________________________________ Haskell 98 mode: Restart with command line option -98 to enable extensions Hugs.Prelude not found on current path: ".:{Home}/lib/hugs/packages/*:/usr/local/lib/hugs/packages/*" FATAL ERROR: Unable to load prelude implementation Where does hugs normally find the Hugs.Prelude file? Thanks, Dave Feustel

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