May 2002 - Hugs-Bugs - Haskell.org

Hugs graphics not working
by Josef Svenningsson 08 May '02

08 May '02

Hi. We're trying to use Haskell Graphics library for X on our solaris machines. Compiling works fine but when we're trying to run the example we get the following error message: Reading file "../../demos/HelloWorld.hs": Reading file "GraphicsUtils.hs": Reading file "GraphicsCore.hs": Reading file "GraphicsEvent.hs": Reading file "GraphicsKey.hs": Reading file "X.hs": Reading file "Xlib_StdDIS.hs": Reading file "/users/cs/josefs/share/hugs/lib/exts/Int.hs": Reading file "/users/cs/josefs/share/hugs/lib/exts/Bits.hs": Reading file "/users/cs/josefs/share/hugs/lib/exts/Int.hs": Reading file "/users/cs/josefs/share/hugs/lib/exts/Word.hs": Reading file "/users/cs/josefs/share/hugs/lib/Numeric.hs": Reading file "/users/cs/josefs/share/hugs/lib/Char.hs": Reading file "/users/cs/josefs/share/hugs/lib/Ratio.hs": Reading file "/users/cs/josefs/share/hugs/lib/Numeric.hs": Reading file "/users/cs/josefs/share/hugs/lib/exts/Word.hs": Reading file "/users/cs/josefs/share/hugs/lib/exts/Addr.hs": Reading file "/users/cs/josefs/share/hugs/lib/Monad.hs": Reading file "/users/cs/josefs/share/hugs/lib/exts/Foreign.hs": Reading file "Xlib_StdDIS.hs": Parsing ERROR "Xlib_StdDIS.hs" - Error while importing DLL "/users/cs/josefs/packages/graphics-2.0.4/lib/x11/Xlib_StdDIS.so": ld.so.1: runhugs: fatal: relocation error: file /usr/X11/lib/libX11.so.6.1: symbol authdes_create: referenced symbol not found I seems to be some incompabilities with the X11 lib but I've no idea what it is or what to do about it. Any ideas? Here's some perhaps relevant info: josefs@muppet90> uname -a SunOS muppet90.cs.chalmers.se 5.7 Generic_106541-16 sun4u sparc SUNW,Ultra-5_10 josefs@muppet90> gcc -v gcc version 2.95.3 20010315 (release) hugs is December 2001 Cheers, /Josef

2 2

set editor problem
by Ernest Paquet 06 May '02

06 May '02

Dear Sirs/Mesdames: I teach Computer Science here at Walsh University, and am planning to teach a new course using Haskell. My computer is a Dell Optiplex GXi with Windows NT version 4. I have Hugs 98, downloaded over a year ago. My download file is named "HUGS98-FEB2001.MSI" -- (I probably inserted the FEB2001 myself.) It installs without problems but at no time asks which editor to associate with HUGS. When I run HUGS and give the command :set, I read the following setting -EC:\WINNT\notepad.exe. Now I have Notetab light installed in C:\Program Files\Notetab Light\notetab.exe. So in Hugs I gave the command: :set -E"C:\\Program Files\\Notetab Light\\notetab.exe". When I then try :edit c:\temp\foo.hs, nothing happens that I can see. I restored the setting to its original form with notepad. Now :edit could no longer bring up notepad. I re-installed HUGS. Still the editor (with setting for notepad as installed) showed no effect when called. How can I set the editor to my preferred software notetab.exe? If I must manually edit the Registry -- something I have never dared to do until now, I would need to know where to navigate to! Many thanks ahead for your kind help! Ernest Paquet Computer Science Dept. Walsh University Canton, OHIO 44720.

2 1

problem
by George Ioannou 06 May '02

06 May '02

i have installed hugs for windows 32 and i think i wrote prelude>:load prelude.hs and from that moment it doesn't work at all it shows me a message ERROR "Prelude.hs" - Module "Prelude" recursively imports itself FATAL ERROR Unable to load prelude please help me if you can _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com

2 1

patch for hugs-dec2001
by Sean O'Rourke 06 May '02

06 May '02

In a couple of places, fgetc()'s return value gets cast to a char before being compared with EOF. The one in input.c makes things hang on my machine. I attached a couple of diffs that fix my problem. /s btw, readline support is a glorious thing... begin 0644 eof-patch M*BHJ("]H;VUE+W-E86XO<W)C+VAU9W,Y."U$96,R,#`Q+W-R8R]H=6=S+F-^ M"51H=2!$96,@,3,@,C(Z-#<Z,S`@,C`P,0HM+2T@+VAO;64O<V5A;B]S<F,O M:'5G<SDX+41E8S(P,#$O<W)C+VAU9W,N8PE3=6X@36%Y("`U(#$Y.C`V.C`R M(#(P,#(**BHJ*BHJ*BHJ*BHJ*BHJ"BHJ*B`S-S,L,S<Y("HJ*BH*("![($=6 M87)N86UE(&QI;F4@(#T@(B(["B`@("!I;G0@("`@("!L:6YE<"`](#`["B`@ M"B$@("!C:&%R(&,["B`@("`@("`@"B`@("!W:&EL92`H("AC/69G971C*&8I M*2`A/2!%3T8@)B8@8R`A/2`G7&XG*2![("`@("`O*B!R96%D($A51U-&3$%' M4R`@("`@("`@("`J+PH@("`@("!I9B`H*&,@(3T@)UQT)RD@)B8@*&,@(3T@ M)UQR)RDI('L@("`@("`@("`@("`@+RH@<VMI<"!S;VUE(&-O;G1R;VP@8VAA M<G,@*B\*+2TM(#,W,RPS-SD@+2TM+0H@('L@1U9A<FYA;64@;&EN92`@/2`B M(CL*("`@(&EN="`@("`@(&QI;F5P(#T@,#L*("`*(2`@(&EN="!C.PH@("`@ M("`@(`H@("`@=VAI;&4@*"`H8SUF9V5T8RAF*2D@(3T@14]&("8F(&,@(3T@ M)UQN)RD@>R`@("`@+RH@<F5A9"!(54=31DQ!1U,@("`@("`@("`@*B\*("`@ M("`@:68@*"AC("$]("=<="<I("8F("AC("$]("=<<B<I*2![("`@("`@("`@ M("`@("\J('-K:7`@<V]M92!C;VYT<F]L(&-H87)S("HO"BHJ*B`O:&]M92]S M96%N+W-R8R]H=6=S.3@M1&5C,C`P,2]S<F,O:6YP=70N8WX)5V5D($1E8R`Q M,B`R,3HR-3HU-2`R,#`Q"BTM+2`O:&]M92]S96%N+W-R8R]H=6=S.3@M1&5C M,C`P,2]S<F,O:6YP=70N8PE3=6X@36%Y("`U(#$Y.C`S.C,W(#(P,#(**BHJ M*BHJ*BHJ*BHJ*BHJ"BHJ*B`U,3(L-3(P("HJ*BH*("!S=&%T:6,@26YT(&QO M8V%L(&YE>'1,:6YE*"D*("!["B`@("`@(&9O<B`H;&EN94QE;F=T:"`](#`[ M(&QI;F5,96YG=&@@/"!,24Y%0E5&1D527U-)6D4M,3L@;&EN94QE;F=T:"LK M*2!["B$@("`@("`@("!L:6YE0G5F9F5R6VQI;F5,96YG=&A=(#T@9F=E=&,H M:6YP=713=')E86TI.PHA("`@("`@("`@:68@*&QI;F5"=69F97);;&EN94QE M;F=T:%T@/3T@14]&*0HA("`@("`@("`@("`@(&)R96%K.PH@("-I9B!-54Q4 M25],24Y%1D5%1`H@("`@("`@("`@:68@*&QI;F5"=69F97);;&EN94QE;F=T M:%T@/3T@)UQR)RD@>PH@("`@("`@("`@("`@(&-H87(@8R`](&9G971C*&EN M<'5T4W1R96%M*3L*+2TM(#4Q,BPU,C$@+2TM+0H@('-T871I8R!);G0@;&]C M86P@;F5X=$QI;F4H*0H@('L*("`@("`@9F]R("AL:6YE3&5N9W1H(#T@,#L@ M;&EN94QE;F=T:"`\($Q)3D5"549&15)?4TE:12TQ.R!L:6YE3&5N9W1H*RLI M('L*(2`):6YT(&,@/2!F9V5T8RAI;G!U=%-T<F5A;2D["B$@"6EF("AC(#T] M($5/1BD*(2`)("`(a)(&)R96%K.PHA("`@("`@("`@;&EN94)U9F9E<EML:6YE M3&5N9W1H72`]("AU;G-I9VYE9"!C:&%R*6,["B`@(VEF($U53%1)7TQ)3D5& M145$"B`@("`@("`@("!I9B`H;&EN94)U9F9E<EML:6YE3&5N9W1H72`]/2`G M7'(G*2!["B`@("`@("`@("`@("`@8VAA<B!C(#T@9F=E=&,H:6YP=713=')E %86TI.PH` end ===== "A foo and his money are soon parted." __________________________________________________ Do You Yahoo!? Yahoo! Health - your guide to health and wellness http://health.yahoo.com

2 1

Lib module Dynamic: bug in instances for tuples
by Joost Visser 06 May '02

06 May '02

Hi, The library module Dynamic provides instances of the Typeable class for various datatypes, among which tuples of various lengths. These instances are incorrect, as demonstrated by the following snippet: Dynamic> (typeOf (True,False)) == ((\(Dynamic t _) -> t) (toDyn (True,False))) False In other words, the type representation produced via the "typeOf" member is not equal to the type representation produced via the function "toDyn". This is wrong. As a result, casting back and forth to the type Dynamic fails: Dynamic> fromDynamic (toDyn (True,False)) :: Maybe (Bool,Bool) Nothing The error is caused by the nested definition of tup2Tc in the following instance declaration: instance (Typeable a, Typeable b) => Typeable (a,b) where typeOf tu = mkAppTy tup2Tc [typeOf (fst tu), typeOf (snd tu)] where fst :: (a,b) -> a fst = undefined snd :: (a,b) -> b snd = undefined tup2Tc = mkTyCon "," If tup2Tc is made top-level, the error vanishes. Likewise for longer tuples. The reason that TyCons must be defined top-level is that they are shared, so they can be mapped onto Ints and compared efficiently. When defined nested inside the instance declaration, this sharing apparently fails. Regards, Joost Visser PS: I'm using hugs98-Dec2001.

2 1

WWW.HASKELL.ORG
by Christine Hall 06 May '02

06 May '02

1 0

Your message to Hugs-Users awaits moderator approval
by hugs-users-admin＠haskell.org 06 May '02

06 May '02

Your mail to 'Hugs-Users' with the subject A very new game Is being held until the list moderator can review it for approval. The reason it is being held: Message body is too big: 126569 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.

1 0

layout ambiguity
by Edmund GRIMLEY EVANS 03 May '02

03 May '02

This program gives different answers with Hugs and GHC. I think Hugs is wrong here: see section 2.7 of the Report, the sentence containing "{}". It wouldn't surprise me if GHC is wrong, too. You might say it's a bad program, so Hugs and GHC can both do whatever they want to, but I'd be a lot happier if at least one of them could signal an error. Can someone make Hugs give an error in cases like this? Edmund a = "ghc" main = print (f "hugs") where f a = y where y = a

2 1

Windows XP
by Andrew Robinson 01 May '02

01 May '02

I have just installed Windows XP on my system, however when I try to run WinHugs I get a fatal error message. saying prelude could not be loaded. Is it possible to fix this or is it not compatible with XP? Yours sincerely Andrew Robinson

3 2