March 2003 - Hugs-Bugs

(no subject)
by survey 31 Mar '03

31 Mar '03

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Syntax error in ST.hs
by mcguire＠cs.utexas.edu 28 Mar '03

28 Mar '03

I noticed this while going through the SOE book: $ hugs __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2002 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Report bugs to: hugs-bugs(a)haskell.org || || Version: November 2002 _________________________________________ Haskell 98 mode: Restart with command line option -98 to enable extensions Reading file "/lusr/lib/hugs/lib/Prelude.hs": Hugs session for: /lusr/lib/hugs/lib/Prelude.hs Type :? for help Prelude> :load Memo Reading file "/lusr/lib/hugs/lib/exts/Memo.hs": Reading file "/lusr/lib/hugs/lib/exts/ST.hs": Reading file "/lusr/lib/hugs/lib/Array.hs": Reading file "/lusr/lib/hugs/lib/Ix.hs": Reading file "/lusr/lib/hugs/lib/List.hs": Reading file "/lusr/lib/hugs/lib/Maybe.hs": Reading file "/lusr/lib/hugs/lib/List.hs": Reading file "/lusr/lib/hugs/lib/Array.hs": Reading file "/lusr/lib/hugs/lib/exts/IOExts.hs": Reading file "/lusr/lib/hugs/lib/IO.hs": Reading file "/lusr/lib/hugs/lib/exts/IORef.lhs": Reading file "/lusr/lib/hugs/lib/exts/IOExts.hs": Reading file "/lusr/lib/hugs/lib/Monad.hs": Reading file "/lusr/lib/hugs/lib/exts/ST.hs": Parsing ERROR "/lusr/lib/hugs/lib/exts/ST.hs":49 - Syntax error in type expression (unexpected `.') Monad> I don't know enough about Haskell to figure out what the problem is. There are at least a couple other modules in the exts directory that apparently show similar errors: ParsecToken, LazyST. Am I looking at a bug or did I do something wrong? Tommy McGuire

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primDivFloat Problem
by Cesar Augusto Acosta Minoli 28 Mar '03

28 Mar '03

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module system bug: qualified exports
by Iavor S. Diatchki 27 Mar '03

27 Mar '03

hi, i run into the following problem: module A (A.f) where import B f = "f of A" module B where f = "f of B" when trying to load module A Hugs says: ERROR "A.hs" - Ambiguous export of entity "f" *** Could refer to: A.f B.f bye iavor

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reading hex literals
by Iavor S. Diatchki 27 Mar '03

27 Mar '03

hi, i am not sure that this is a bug (i.e. i have not checked the report) but it works in GHC: in Hugs: Prelude> read "0x20" :: Int Program error: Prelude.read: no parse in GHC: Prelude> read "0x20" :: Int 32 bye iavor

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errors to stdout?
by Andrew Pimlott 23 Mar '03

23 Mar '03

Hugs dumps errors, traces, and other diagnostics to stdout. It even has the rather perverse #define errorStream stdout (except on windows, it appears) so I assume there is a reason for it. However, I can't imagine the reason, and it is quite annoying to me. I am running "December 2001" hugs on Debian GNU/Linux. I looked at the CVS sources, and trace now seems to go to stderr, but errors still seem to go to stdout (I haven't tried it to be sure). Would you accept a patch to change everything to stderr? Andrew

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failure to check completeness in instance declarations
by Andrew Tolmach 21 Mar '03

21 Mar '03

The following file is accepted by hugs (Nov.02 version on linux) without complaint. Attempting to evaluate z causes a Segmentation fault (not unreasonably, perhaps!). As far as I can tell, completeness is never being checked statically. Sometimes it is successfully checked dynamically and causes an "Undefined member" error. ----------- data Foo a = Foo a instance Eq (Foo a) where z = Foo 1 == Foo 2 ---------------

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existential types and functional dependencies
by Christian Maeder 20 Mar '03

20 Mar '03

The following module is accepted by ghc (with -fglasgow-exts) but rejected by hugs: module ParseAny where class Syntax tag as | tag -> as where parse :: tag -> String -> as data AnyAs = forall tag as. Syntax tag as => MkAs tag as data AnyTag = forall tag as. Syntax tag as => MkTag tag parseAny :: AnyTag -> String -> AnyAs parseAny (MkTag tag) str = MkAs tag $ parse tag str -- ------------------------------------------------------- Hugs mode: Restart with command line option +98 for Haskell 98 mode Reading file "/home/linux-bkb/hugs/lib/hugs/libraries/Hugs/Prelude.hs": Reading file "/home/linux-bkb/hugs/lib/hugs/libraries/Prelude.hs": Reading file "ParseAny.hs": Type checking ERROR "ParseAny.hs":13 - Cannot justify constraints in explicitly typed binding *** Expression : parseAny *** Type : AnyTag -> String -> AnyAs *** Given context : () *** Constraints : Syntax _0 a When I omit the functional dependency "| tag -> as", ghc yields a similar error Cheers Christian

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Your message to Hugs-Users awaits moderator approval
by hugs-users-admin＠haskell.org 18 Mar '03

18 Mar '03

Your mail to 'Hugs-Users' with the subject A very new website Is being held until the list moderator can review it for approval. The reason it is being held: Message body is too big: 143966 bytes but there's a limit of 40 KB Either the message will get posted to the list, or you will receive notification of the moderator's decision.

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MarshalUtils.hs
by Dennis Sidharta 17 Mar '03

17 Mar '03

I tried to run a program that imports SOEGraphics, and I got this error message when hugs tried to read MarshalUtils.hs: "Reading file ... ... Reading file "C:\Program Files\Hugs98\lib\exts\MarshalUtils.hs": Parsing ERROR "C:\Program Files\Hugs98\lib\exts\MarshalUtils.hs":2 - Syntax error in module definition (unexpected keyword "with"; possible cause: -W option not used.) " FYI, I am using WinXP. -- __________________________________________________________ Sign-up for your own FREE Personalized E-mail at Mail.com http://www.mail.com/?sr=signup

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