[Haskell-beginners] Problems installing TagSoup.Parsec

[Daniel Fischer]

Am Montag 01 Februar 2010 21:21:12 schrieb Mark Wong-VanHaren:
> Hi, folks-
>
> I'm a Haskell newbie.  There's a very real chance my question has a
> simple answer.

Yes and no. The problem is that the build-depends field of tagsoup-
parsec.cabal doesn't specify an upper bound on the version of tagsoup to 
use. Thus cabal tries to build it with the latest and greates tagsoup, 0.8.
Neill Mitchell changed the tagsoup API, bad .cabal files break.

Fix: unpack tagsoup-parsec-0.0.6, open the .cabal file, change


Library
   Build-Depends:  base<5, tagsoup, parsec<3

to

Library
   Build-Depends:  base<5, tagsoup < 0.7, parsec<3

$ cd tagsoup-parsec-0.0.6
$ cabal install

email maintainer of tagsoup-parsec to fix it (adapt to new tagsoup API).

>
> I wish to use the library Text.HTML.TagSoup.Parsec (
> http://hackage.haskell.org/package/tagsoup-parsec), which looks very
> cool.
>
> When I attempt to install it, I get this error:
>
> # cabal install tagsoup-parsec
> Resolving dependencies...
> Configuring tagsoup-parsec-0.0.6...
> Preprocessing library tagsoup-parsec-0.0.6...
> Building tagsoup-parsec-0.0.6...
> [1 of 1] Compiling Text.HTML.TagSoup.Parsec (
> Text/HTML/TagSoup/Parsec.hs, dist/build/Text/HTML/TagSoup/Parsec.o )
>
> Text/HTML/TagSoup/Parsec.hs:37:5:
>    `Tag' is not applied to enough type arguments
>    Expected kind `*', but `Tag' has kind `* -> *'
>    In the type synonym declaration for `WholeTag'
> cabal: Error: some packages failed to install:
> tagsoup-parsec-0.0.6 failed during the building phase. The exception
> was: exit: ExitFailure 1
>
>
> It would seem to be a type mismatch between TagSoup.Parsec and the base
> TagSoup (on which it depends).
>
> Suspecting that the version-number dependency information might be
> incorrect, I tried uninstalling TagSoup and reinstalling an older
> version. This didn't help.
>
> Can anyone steer me in the right direction?
>
> Thanks!
> -Mark