February 2002 - Hugs-Bugs

constraints inside classes
by Ross Paterson 22 Feb '02

22 Feb '02

Hugs and GHC (but not NHC) erroneously accept the following: class Foo a where f :: Eq a => a -> Bool

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Arts & Crafts in SE USA
by noshow＠carolinashows.com 22 Feb '02

22 Feb '02

Carolina Shows is now on the WEB 9 Shows Get your show Discount Coupon GOTO carolinashows.com remove @ noshow(a)carolinashows.com

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RE: hugs / ghc difference over '(..)' imports
by Simon Marlow 19 Feb '02

19 Feb '02

> There is a difference between hugs and ghc in how they treat > imports with the > '(..)' notation. Here's my example: > > module CTree( > --other stuff > Const(..) > ) where > > import ATree (Const) > > --const has constructors CInt, CChar, CStr > > under hugs this module exports CInt, CChar, CStr > but under ghc it does not. Under ghc it only exports the > constructors if I > import 'Const' like this: > > import ATree (Const(..)) > > I don't know which is the right behaviour w.r.t. the H98 > standard, but it > tripped me up. GHC is correct here. According to the Haskell 98 report C(..) exports C and all its constructors *that are currently in scope*. Cheers, Simon

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copyright notice
by Ross Paterson 19 Feb '02

19 Feb '02

Most of the files in src/winhugs still have the old copyright notice.

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missing braces
by Ross Paterson 12 Feb '02

12 Feb '02

>From hugs.c: static Void local addScriptName(s,sch) /* Add script to list of scripts */ String s; /* to be read in ... */ Bool sch; { /* TRUE => requires pathname search*/ if (namesUpto>=NUM_SCRIPTS) { ERRMSG(0) "Too many module files (maximum of %d allowed)", NUM_SCRIPTS EEND; } else scriptName[namesUpto] = strCopy(sch ? findPathname(NULL,s) : s); scriptReal[namesUpto] = strCopy(RealPath(scriptName[namesUpto])); namesUpto++; }

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Rave News & Party Listings from The Loop
by The Loop Newsletter 12 Feb '02

12 Feb '02

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Philipszaal IRENE 2/9 - Atlanta, GA Mirage 2/12 - Salt Lake City, UT Axis 2/16 - Albuquerque, NM Global House Diva 2 Tour Event 2/21 - San Diego, CA SNO 3/9 - Houston, TX Club Numbers Event 3/22 - Los Angeles, CA Red @ the Arena 3/29 - Dallas, Tx Lizard Lounge 4/12 - Pittsburg, PA Mystic Motion Event For more party and event listings, visit: http://www.karmaloop.com/karma/theloop/events.htm ----------------------------------------------------------------- You are currently subscribed to The Loop as: hugs-bugs(a)haskell.org To edit your interests or unsubscribe visit: http://ccprod.roving.com/roving/d.jsp?p=oo&m=1000810254440&ea=hugs-bugs@has… Send suggestions and comments to: theloop(a)karmaloop.com © 2002, Karmaloop LLC. All Rights Reserved. ----------------------------------------------------------------- Powered by Constant Contact www.constantcontact

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windows XP
by Joao Carmo 11 Feb '02

11 Feb '02

i can't install hugs 98 in windows XP .He can't load prelude

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internal error.....
by Byron Cook 11 Feb '02

11 Feb '02

Hi hugs developers..... I'm getting the following error mesg: [byco@bench4 t2h]$ hugs -98 -h99999999 newmodel.hs __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2001 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Report bugs to: hugs-bugs(a)haskell.org || || Version: February 2001 _________________________________________ Hugs mode: Restart with command line option +98 for Haskell 98 mode Reading file "/rhea/u2/byco/hugs/share/hugs/lib/Prelude.hs": Reading file "newmodel.hs": Compiling INTERNAL ERROR: lift the file is pretty large: [byco@bench3 t2h]$ wc newmodel.hs 11450 130059 822584 newmodel.hs Is there some sort of remedy? Thanks - Byron

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RE: layout rules for "where"
by Simon Marlow 08 Feb '02

08 Feb '02

> Can't we require that a local definition be more indented than the > enclosing definition? That way my code would've been rejected by the > compiler, and the error message (something like "Empty where-clause on > line xxx") can actually be helpful. The Haskell definition *does* require that nested definitions be more indented than the enclosing scope, and empty where declarations are legal. Hugs doesn't follow the report here. Thanks for providing some evidence to support my view that this restriction on the layout rule is The Right Thing :-) Cheers, Simon

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Hugs implicit parameters bug
by Conal Elliott 07 Feb '02

07 Feb '02

Dec 2001 Hugs balks at the following simple program, while ghc 5.02.1 likes it just fine. module Tst where t1 :: (Num a) => Int -> ((?z :: Int) => a) -> a t1 w imp = imp with ?z = w The Hugs error message: ERROR "f:/Shader/tst.hs":3 - Inferred type is not general enough *** Expression : t1 *** Expected type : Num a => Int -> ((?z :: Int) => a) -> a *** Inferred type : Num Int => Int -> ((?z :: Int) => a) -> Int I can eliminate the error message by making the function be monomorphic or by eliminating the first argument and using a numeric literal, i.e., hugs likes the following just fine: t2 :: Int -> ((?z :: Int) => String) -> String t2 w imp = imp with ?z = w t3 :: (Num a) => ((?z :: Int) => a) -> a t3 imp = imp with ?z = 3 - Conal

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