[Haskell-beginners] Re: HXT runtime error

[aditya siram]

Upon further investigation, it seems my problem is using HaXml 1.13.2 and
HXT 8.3.0 in the same file. Furthermore I can't even import both HaXml and
HXT because they each pull in different versions of 'network' which is
causing the 'duplicate definition for symbol' problem. I can't think of a
workaround - so I guess it's one or the other.

Also is there any reason the cabal installed version of HaXml 1.13.3 is so
far behind the latest release 1.19.7? Is HXT, with a far more recent
release, preferable overall?

thanks,
deech

On Wed, Jun 3, 2009 at 12:42 AM, aditya siram <aditya.siram at gmail.com>wrote:

> Hi all,
> I am trying to use HXT to parse an XML file. However whenever I try and run
> 'xread', GHCI crashes. The code and output are below.
>
> The following code queries isbndb.com ( a book ISBN database ) which
> responds with XML describing the book. I am using 'xread' from HXT to parse
> the response into an XMLTree.
>
> respHTML'' isbn = do
>       rsp <- simpleHTTP (getRequest $ "
> http://isbndb.com/api/books.xml?results=details&access_key="
>                                 ++ key
>                                 ++ "&index1=isbn&value1="
>                                 ++ isbn :: Request_String)
>       case rsp of
>         Left x  -> putStrLn $ "Error " ++ (show x)
>         Right r -> putStrLn $ show $ xread $ rspBody r
>
> When I try this respHTML'' in GHCI usin the isbn for "Real World Haskell" ,
> this is what I get:
>
> *Main> respHTML'' rwhis
> Loading package syb ... linking ... done.
> Loading package base-3.0.3.1 ... linking ... done.
> Loading package array-0.2.0.0 ... linking ... done.
> Loading package containers-0.2.0.1 ... linking ... done.
> Loading package bytestring-0.9.1.4 ... linking ... done.
> Loading package old-locale-1.0.0.1 ... linking ... done.
> Loading package old-time-1.0.0.2 ... linking ... done.
> Loading package unix-2.3.2.0 ... linking ... done.
> Loading package filepath-1.1.0.2 ... linking ... done.
> Loading package directory-1.0.0.3 ... linking ... done.
> Loading package process-1.0.1.1 ... linking ... done.
> Loading package pretty-1.0.1.0 ... linking ... done.
> Loading package random-1.0.0.1 ... linking ... done.
> Loading package haskell98 ... linking ... done.
> Loading package parsec-2.1.0.1 ... linking ... done.
> Loading package network-2.2.1 ... linking ... done.
> Loading package mtl-1.1.0.2 ... linking ... done.
> Loading package parallel-1.1.0.1 ... linking ... done.
> Loading package HTTP-4000.0.6 ... linking ... done.
> Loading package HaXml-1.13.3 ... linking ... done.
> Loading package MaybeT-0.1.2 ... linking ... done.
> Loading package HUnit-1.2.0.3 ... linking ... done.
> Loading package curl-1.3.5 ... linking ... done.
> Loading package network-2.2.1.2 ...
>
> GHCi runtime linker: fatal error: I found a duplicate definition for symbol
>    my_inet_ntoa
> whilst processing object file
>    /home/deech/.cabal/lib/network-2.2.1.2/ghc-6.10.3/HSnetwork-2.2.1.2.o
> This could be caused by:
>    * Loading two different object files which export the same symbol
>    * Specifying the same object file twice on the GHCi command line
>    * An incorrect `package.conf' entry, causing some object to be
>      loaded twice.
> GHCi cannot safely continue in this situation.  Exiting now.  Sorry.
>
> It seems to want to load the 'network' package twice. Is this causing the
> trouble?
>
> thanks ,
> deech
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.haskell.org/pipermail/beginners/attachments/20090603/3e26b909/attachment-0001.html