Re: [Haskell-cafe] MySQL and Haskell on Windows
Hi, some time ago I've had similar problems making MySQL work on Windows, and I wrote a post to haskell-cafe how I finally fixed them [1]. Maybe it helps you to solve your problems. I'm still getting linker errors when using hsql-mysql [2], so if you're going to use it and run into the same errors, but are able to fix them -- please let me know! Best wishes, Maciej [1] http://www.mail-archive.com/haskell-cafe@haskell.org/msg61265.html [2] http://www.mail-archive.com/haskell-cafe@haskell.org/msg71670.html gladst...@gladstein.com wrote: cabal install hdbc-mysql almost works on windows, but errors because the mysql_config command isn't part of the windows MySQL install. Has anyone been able to get a Haskell interface to MySql going on Windows, either directly or via odbc? cabal install haskelldb-hsql-odbc fails because it can't find an 'odbc' library. There are any number of odbc dll's installed by the MySQL odbc connector, but they all have slightly different names. As always, a precompiled binary would be preferable but I'm happy to compile stuff under Cygwin or MINGW if need be. Thanks in advance for your help. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Happstack/Apache configuration problem
Hi, I'm not sure if this is the right place to ask because the problem may lay in my Apache or system configuration. I use the Apache proxy module to forward a HTTP request from port 80 to a Happstack application listening on port 8000 via `ProxyPass / http://localhost:8000/' on Windows XP. When calling http://my_domain in the browser, I get `503 service temporarily unavailable' and in the apache logs `proxy: HTTP: attempt to connect to 127.0.0.1:8000 (localhost) failed'. So I tried to access http://127.0.0.1:8000 manually in the browser but got a connection error, while http://[::1]:8000/ works perfectly and displays the content returned from the Happstack application. Maybe I'm wrong, but isn't the problem here that Happstack only accepts IPv6 addresses, while Apache forwards an IPv4 request? Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] installing Network on windows
Am 17.03.2010 21:17 schrieb Andrew Coppin: gladst...@gladstein.com wrote: I need some advice on the most straightforward way to install the Network package on Windows. I can install Cywgin if that's what it takes. Thanks in advance. cabal install network Resolving dependencies... Configuring network-2.2.1.7... cabal: Error: some packages failed to install: network-2.2.1.7 failed during the configure step. The exception was: sh: runGenProcess: does not exist (No such file or directory) Looks like it wants to run sh (i.e., the Borne Shell), which obviously doesn't exist on Windows. Now I'm sure some kind soul somewhere has probably compiled a Win32 binary for it, but I would suggest that the build will just immediately trip over again because some *other* Unix-only tool isn't available. How to fix? Well, I'm guessing you'll be forced to install some kind of Unix emulation layer such as Cygwin. I don't have any expertise of such things... You can also use MSYS/MinGW, I prefer this to Cygwin. Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Problems linking hsql-mysql
Hi, no, it's absolutely not urgent. I'm just in early stage with building a Happstack webpage and testing via GHCi works fine. The problem occurs on a Windows XP machine with hsql-1.7.1, hsql-mysql-1.7.1, GHC-6.10.4 and MySQL Server 5.1. Last year I posted an instruction on how I got hsql-mysql running (see http://www.mail-archive.com/haskell-cafe@haskell.org/msg61265.html), the changes for the new GHC version where exactly the same. To replicate the error, just do an import Database.HSQL.MySQL and build the file via ghc --make. As far as I remember this worked with GHC-6.8.3, but I'm not quite sure. Let me know if you need additional informationen. Thanks for help, Maciej Am 24.02.2010 01:07 schrieb Nick Rudnick: Hi Maciej, I will try to reproduce the error -- could you send me your both *.cabal files (for hsql hsql-mysql), if you have changed anything, and your system configuration. Is this extremely urgent? I ask this, as these days exactly the end phase of the projects of about 100 beginner Haskell students, which I am the one to look after. So I am in a little of slow motion regarding other things... ;-) But in case you are in emergency, please let me know... At first sight, I would say it looks like a configuration problem... ;-) Cheers, Nick Maciej Podgurski wrote: Hi, I have problems linking a simple test program that imports Database.HSQL.MySQL via ghc --make Test.hs. The error only occurs when importing this module of hsql-mysql-1.7.1. I pasted the building output here: http://hpaste.org/fastcgi/hpaste.fcgi/view?id=22911 (actually it was even longer but hpaste only takes 30k). When I do ghc -e main Test.hs or starting it from GHCi, everything works fine and no errors occur. So I guess all needed .lib files are there but GHC can't find them when linking (adding the flag -Lpath to mysql/lib/opt doesn't help). Anyone an idea? Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Problems linking hsql-mysql
Hi, I have problems linking a simple test program that imports Database.HSQL.MySQL via ghc --make Test.hs. The error only occurs when importing this module of hsql-mysql-1.7.1. I pasted the building output here: http://hpaste.org/fastcgi/hpaste.fcgi/view?id=22911 (actually it was even longer but hpaste only takes 30k). When I do ghc -e main Test.hs or starting it from GHCi, everything works fine and no errors occur. So I guess all needed .lib files are there but GHC can't find them when linking (adding the flag -Lpath to mysql/lib/opt doesn't help). Anyone an idea? Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Cabal update problem
Hi, after updating to cabal-install-0.8.0/Cabal-1.8.0.2 with GHC 6.10.4, I always get an error when updating the package list: cabal update Downloading the latest package list from hackage.haskell.org cabal: Codec.Compression.Zlib: premature end of compressed stream Is there a way to fix this without rebuilding from the latest darcs repo? Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Re: Cabal update problem
Am 19.02.2010 12:57 schrieb Christian Maeder: Maciej Podgurski schrieb: Hi, after updating to cabal-install-0.8.0/Cabal-1.8.0.2 with GHC 6.10.4, I always get an error when updating the package list: cabal update Downloading the latest package list from hackage.haskell.org cabal: Codec.Compression.Zlib: premature end of compressed stream Is there a way to fix this without rebuilding from the latest darcs repo? Does removing ~/.cabal/packages/hackage.haskell.org/00-index.tar.gz help? Did you overwrite your old cabal-binary. If not, does this binary also fail? Removing this file doesn't help. The old version was cabal-install-0.6.2 + Cabal-1.6.0.2 with GHC 6.10.3. I deleted it because I changed to GHC 6.10.4, but it worked fine 2 days ago. (I think everything under ~/.cabal/packages/hackage.haskell.org can be savely deleted and will be downloaded again if needed.) Which architecture you're on? Windows XP Best wishes, Maciej Cheers Christian Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-caf ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Cabal update problem
Am 19.02.2010 13:55 schrieb Valery V. Vorotyntsev: after updating to cabal-install-0.8.0/Cabal-1.8.0.2 with GHC 6.10.4, I always get an error when updating the package list: cabal update Downloading the latest package list from hackage.haskell.org cabal: Codec.Compression.Zlib: premature end of compressed stream Would you please send the output of `cabal update -v3' command? Downloading the latest package list from hackage.haskell.org Sending: GET /packages/archive/00-index.tar.gz HTTP/1.1 Host: hackage.haskell.org User-Agent: cabal-install/0.8.0 Creating new connection to hackage.haskell.org Received: HTTP/1.1 200 OK Date: Fri, 19 Feb 2010 13:28:11 GMT Server: Apache/2.2.9 (Debian) mod_python/3.3.1 Python/2.5.2 Last-Modified: Fri, 19 Feb 2010 11:18:51 GMT ETag: 1bda0c4-167869-47ff23f7fdcc0 Accept-Ranges: bytes Content-Length: 1472617 Content-Type: application/x-tar Content-Encoding: x-gzip Downloaded to C:\Dokumente und Einstellungen\Maciej\Anwendungsdaten\cabal\packages\hackage.haskell.org\00-index.tar.gz cabal: Codec.Compression.Zlib: premature end of compressed stream Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Re: Cabal update problem
Am 19.02.2010 15:29 schrieb Christian Maeder: Sorry, I've got no further idea (except reinstalling everything). http://hackage.haskell.org/trac/hackage/ticket/562 may be related. Did your installation of cabal-install-0.8.0 also reinstall HTTP and zlib packages? Yes, I installed the latest versions of that packages. Now I tried to gradually go back to the versions before (HTTP-4000.0.9 to 4000.0.7 and zlib-0.5.2.0 to 0.5.0.0), without any success. Finally cabal-install made it at version 0.6.2, so the problem really seems to be at cabal-install-0.8.0. Good luck Christian Maciej Podgurski schrieb: Am 19.02.2010 12:57 schrieb Christian Maeder: Maciej Podgurski schrieb: Hi, after updating to cabal-install-0.8.0/Cabal-1.8.0.2 with GHC 6.10.4, I always get an error when updating the package list: cabal update Downloading the latest package list from hackage.haskell.org cabal: Codec.Compression.Zlib: premature end of compressed stream Is there a way to fix this without rebuilding from the latest darcs repo? Does removing ~/.cabal/packages/hackage.haskell.org/00-index.tar.gz help? Did you overwrite your old cabal-binary. If not, does this binary also fail? Removing this file doesn't help. The old version was cabal-install-0.6.2 + Cabal-1.6.0.2 with GHC 6.10.3. I deleted it because I changed to GHC 6.10.4, but it worked fine 2 days ago. (I think everything under ~/.cabal/packages/hackage.haskell.org can be savely deleted and will be downloaded again if needed.) Which architecture you're on? Windows XP Best wishes, Maciej Cheers Christian Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-caf ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Re: Cabal update problem
But the platform only includes cabal-install-0.6.2. My intention was getting the merge-all-package-documentation-into-single-html feature :-) Best wishes, Maciej Am 19.02.2010 16:50 schrieb Bas van Gijzel: I had the same problem on Windows XP when doing cabal install cabal-install. I fixed it by just replacing the cabal-install executable by the old one used in the haskell platform. Cheers, Bas On 19 February 2010 16:11, Maciej Podgurski maciej.podgur...@googlemail.com wrote: Am 19.02.2010 15:29 schrieb Christian Maeder: Sorry, I've got no further idea (except reinstalling everything). http://hackage.haskell.org/trac/hackage/ticket/562 may be related. Did your installation of cabal-install-0.8.0 also reinstall HTTP and zlib packages? Yes, I installed the latest versions of that packages. Now I tried to gradually go back to the versions before (HTTP-4000.0.9 to 4000.0.7 and zlib-0.5.2.0 to 0.5.0.0), without any success. Finally cabal-install made it at version 0.6.2, so the problem really seems to be at cabal-install-0.8.0. Good luck Christian Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Virus alert while installing happstack
Hi, I tried to install happstack via cabal install happstack on my WinXP system. While installation progress, my anti-virus software (Avira AntiVir) warned me about dll_hsc_make.exe and files_hsc_make.exe to be a Trojan horse called TR/Dropper.Gen. It's a bit confusing to get a virus alert while installing Haskell packages. Has anyone experienced this problem? And can I trust these files to be harmless? Besh wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Use MySQL from Haskell
Does Database.HDBC.getTables work for you? I successfully created a new table and selected data from a database but getTables always returns an empty list (what is not a big problem since a query show tables works fine). Besh wishes, Maciej W dniu 19.06.2009 13:50 Daniel van den Eijkel pisze: The same with me - I'm on XP, and HDBC-odbc is the library I got running to access the MySQL database. Regards, Daniel Michael Snoyman schrieb: Marciej, I went the HDBC route and got the same problem. Although it does not seem to be officially blessed, try installing the time-1.1.3 package. It's working for me at least, which I know is a dubious recommendation. Also, I am currently using the hdbc-odbc package for accessing MySQL. I couldn't get hdbc-mysql to work properly. I hope that once I get this project working right, I'll have a chance to dig into the hdbc-mysql issue itself. Good luck! Michael ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Use MySQL from Haskell
Hi Björn, thanks for your hint, I finally made HDBC-odbc and even hsql-mysql run. Below is a step-by-step manual how to install both packages on windows for people having the same troubles I had. I used GHC 6.8.3. MySQL from HDBC-odbc 1.) Install package time-1.1.2.4. 2.) Download package convertible-1.0.5. In convertible.cabal find the line Build-Depends: ..., time=1.1.2.4, ... and replace it by Build-Depends: ..., time=1.1.2.4 1.1.3, ... Now the installation shouldn't fail with a compilation error. 3.) Download package HDBC-2.1.1, modfiy HDBC.cabal in the same way as in 2.) and install the package. 4.) Install package HDBC-odbc-2.1.0.0. 5.) There still was one thing I didn't know that made my example fail with an exception. You need to install a MySQL ODBC connector for Windows (available from dev.mysql.com). 6) Now the following example should return a list of all table names in the database: import Database.HDBC import Database.HDBC.ODBC main :: IO () main = do conn - connectODBC DRIVER={MySQL ODBC 5.1 Driver}; SERVER=my_server; DATABASE=my_database; UID=my_username; PASSWORD=my_password qs - quickQuery' conn show tables [] mapM_ (\[SqlByteString table] - print table) qs disconnect conn (There's also a getTables function but it always returns an empty list on my system, I don't know why). MySQL from hsql-mysql * 1.) Install package hsql-1.7.1. 2.) Download package hsql-mysql-1.7.1. In hsql-mysql.cabal find the line include-dirs: Database/HSQL, /usr/include/mysql and replace it by include-dirs: Database/HSQL Also find the line extra-lib-dirs: /usr/lib/mysql and remove it. 3.) Do a runghc Setup configure --extra-include-dirs=path_to_mysql/include/ --extra-lib-dirs=path_to_mysql/lib/opt/ runghc Setup build runghc Setup install where path_to_mysql is the path to your MySQL server installation. I'm using MySQL Server 5.1, so maybe you have to adjust the include or lib path. 4.) Now you should be able to compile: import Database.HSQL import Database.HSQL.MySQL main :: IO () main = do conn - connect my_server my_database my_username my_password ts - tables conn mapM_ print ts disconnect conn 5.) Execute the main function. If you get an error like Loading package hsql-mysql-1.7.1 ... can't load .so/.DLL for: mysqlclient (addDLL: unknown error) go to path_to_mysql/bin where a file libmySQL.dll should reside. Copy this file to mysqlclient.dll and try executing the main function again. Now you should get a list of all tables in the database. Installing HDBC-mysql still failed due to a missing file mysql_config which seems to be available only for linux systems. Best wishes, Maciej W dniu 19.06.2009 09:31 Björn Peemöller pisze: Maciej Podgurski schrieb: So I switched to HDBC-2.1.1 and got the next compile error: Building convertible-1.0.5... Data/Convertible/Instances/Num.hs:671:0: warning: no newline at end of file [...] [5 of 8] Compiling Data.Convertible.Instances.C ( Data/Convertible/Instances/C.hs, dist\build/Data/C onvertible/Instances/C.o ) [6 of 8] Compiling Data.Convertible.Instances.Time ( Data/Convertible/Instances/Time.hs, dist\build/ Data/Convertible/Instances/Time.o ) Data/Convertible/Instances/Time.hs:64:0: Duplicate instance declarations: instance Typeable NominalDiffTime -- Defined at Data/Convertible/Instances/Time.hs:(64,0)-(65,42) instance Typeable NominalDiffTime -- Defined in time-1.1.3:Data.Time.Clock.UTC Data/Convertible/Instances/Time.hs:67:0: Duplicate instance declarations: instance Typeable UTCTime -- Defined at Data/Convertible/Instances/Time.hs:(67,0)-(68,34) instance Typeable UTCTime -- Defined in time-1.1.3:Data.Time.Clock.UTC Hi Maciej, this is quite easy to fix (although a little bit dirty). The problem is that time-1.1.3 now defines some Typeable instances which time-1.1.2.4 did not and which are therefore defined in convertible, too. I don't know a general fix to the problem, but you can either - download the convertible package and comment out the two instance declarations as shown in the error message and then cabal install it - install from Hackage with additional constraint: cabal install convertible --constraint=time1.1.3 I hope this will help you get HDBC running. Cheers, Björn ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Use MySQL from Haskell
Hi Daniel, I use HDBC-2.1.1 + HDBC-odbc-2.1.0.0 with GHC 6.8.3 and MySQL Server 5.1 on XP. The hsql equivalent Database.HSQL.tables works as expected. Best wishes, Maciej W dniu 20.06.2009 01:16 Daniel van den Eijkel pisze: Hi Maciej, Database.HDBC.getTables works fine here (XP, ghc 6.10.2, HDBC-2.1.0, HDBC-ODBC-2.1.0.0) - it gives me the list of all tablenames, as intended. Which HDBC version do you use? best regards, daniel Maciej Podgurski schrieb: Does Database.HDBC.getTables work for you? I successfully created a new table and selected data from a database but getTables always returns an empty list (what is not a big problem since a query show tables works fine). Besh wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Use MySQL from Haskell
Hello, I'm trying to use MySQL from Haskell but it seems impossible for me to install one of the MySQL packages on my Windows XP machine. First I tired to install hsql-mysql-1.7.1 on GHC 6.10.3 but installing haskelldb-hsql failed with a hidden package error. So I added the old-time package to the cabal file but there still was a compile error (something due to the change from Exception to Exception e = e). So I switched to GHC 6.8.3 and tried it again. Now it says: Configuring hsql-mysql-1.7.1... Warning: 'extra-lib-dirs: /usr/lib/mysql' directory does not exist. Warning: 'include-dirs: /usr/include/mysql' directory does not exist. Warning: This package indirectly depends on multiple versions of the same package. This is highly likely to cause a compile failure. package process-1.0.0.1 requires filepath-1.1.0.0 package directory-1.0.0.1 requires filepath-1.1.0.0 package Cabal-1.6.0.3 requires filepath-1.1.0.2 Setup: Missing dependency on a foreign library: * Missing C library: mysqlclient This problem can usually be solved by installing the system package that provides this library (you may need the -dev version). If the library is already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where it is. There's no Haskell package mysqlclient and I don't know how to install a C library in Haskell. So I switched to HDBC-2.1.1 and got the next compile error: Building convertible-1.0.5... Data/Convertible/Instances/Num.hs:671:0: warning: no newline at end of file [...] [5 of 8] Compiling Data.Convertible.Instances.C ( Data/Convertible/Instances/C.hs, dist\build/Data/C onvertible/Instances/C.o ) [6 of 8] Compiling Data.Convertible.Instances.Time ( Data/Convertible/Instances/Time.hs, dist\build/ Data/Convertible/Instances/Time.o ) Data/Convertible/Instances/Time.hs:64:0: Duplicate instance declarations: instance Typeable NominalDiffTime -- Defined at Data/Convertible/Instances/Time.hs:(64,0)-(65,42) instance Typeable NominalDiffTime -- Defined in time-1.1.3:Data.Time.Clock.UTC Data/Convertible/Instances/Time.hs:67:0: Duplicate instance declarations: instance Typeable UTCTime -- Defined at Data/Convertible/Instances/Time.hs:(67,0)-(68,34) instance Typeable UTCTime -- Defined in time-1.1.3:Data.Time.Clock.UTC So please help me, what GHC/package configuration will I need to use MySQL from my Haskell programs on Windows? I really like Haskell but all those broken packages are really discouraging. :( Best wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] self-referential data
brian wrote: On Sat, Aug 9, 2008 at 5:18 PM, Brent Yorgey [EMAIL PROTECTED] wrote: The problem is that BString is not a type, it is a data constructor. I know. You could use M.Map BValue BValue, but of course that's probably not what you want either. Right. That wouldn't be according to spec either. What's wrong with just using 'String' as the Map key? It seems wrong. Yeah, it's just a String, but we're being all abstract because that's better practice. It happens that when you parse bencoded data, the length of the string is given. Maybe I want to store that in BString, too. But mainly I want to know how to think about it differently so that I know what to do when it comes up again and actually matters. What about using a type parameter: data BValue bString = BString bString | BIntegerInteger | BList [BValue bString] | BDictionary (Map bString (BValue bString)) Regards, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Return user state in Parsec
Hi, I'm currently writing a parser using the Parsec library. What I want is to store the order of each subparser called in a user state. So every single parser will be marked with a label that is stored in a special treelike structure when the parser is run. My problem is to return the last state of this structure when a parse error occurred. This information shall be used to display a kind of stack trace showing the order of the parser calls for debug purposes. Any ideas how to achieve this? Thanks, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Parsec: Transforming between parsers with different token streams
Hi, I'm writing a simple parser for a line-oriented language using Parsec. A group of lines is parsed by a parser that tokens are of type String. Each token is again parsed by a parser that tokens are of type Char (i.e. this parser has the Parsec type Parser a). Now I wrote a transforming function that converts a char parser to a line parser by running the char parser on the current token of the line parser and accepting the token, if the char parser did not fail: type LineParser = GenParser String () a toLineParser :: Parser a - LineParser a toLineParser p = tokenPrim showLine nextPos testLine ? how to get the inner error message??? where showLine l = \: ++ l ++ \ nextPos pos t rest = incSourceLine pos 1 testLine l = case parse p l of Left msg - Nothing Right res - Just res My problem is to extract the possible error message of the inner char parser (msg) and pass it to the outer line parser. Maybe using tokenPrim is no the best approach here. Someone how can help me with that problem? Besh wishes, Maciej ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe