[Haskell-cafe] Strange discrepancy between Emacs interpreter and command-line on windows

[Arnaud Bailly]

I did:

ghc-pkg unregister bytestring-0.9.1.6

then restarted emacs and it works now. Don't now if ther weill be
side-effects on other packages...

Thanks for the tip.

arnaud

On Thu, Jun 10, 2010 at 6:15 AM, Arnaud Bailly <arnaud.oqube at gmail.com> wrote:
> Yes, I have two versions installed , 0.9.1.4 and 0.9.1.6. Here is the
> output of ghc-pkg -l:
>
> d:/Program Files/Haskell Platform/2009.2.0.2\package.conf:
>    Cabal-1.6.0.3, GLUT-2.1.1.2, HSlim-0.1, HTTP-4000.0.6,
>    HUnit-1.2.0.3, OpenGL-2.2.1.1, QuickCheck-1.2.0.0,
>    QuickCheck-2.1.0.3, Win32-2.2.0.0, array-0.2.0.0, base-3.0.3.1,
>    base-4.1.0.0, bytestring-0.9.1.4, bytestring-0.9.1.6,
>    cgi-3001.1.7.1, containers-0.2.0.1, directory-1.0.0.3,
>    (dph-base-0.3), (dph-par-0.3), (dph-prim-interface-0.3),
>    (dph-prim-par-0.3), (dph-prim-seq-0.3), (dph-seq-0.3),
>    extensible-exceptions-0.1.1.0, fgl-5.4.2.2, filepath-1.1.0.2,
>    (ghc-6.10.4), ghc-prim-0.1.0.0, haddock-2.4.2, haskell-src-1.0.1.3,
>    haskell98-1.0.1.0, hpc-0.5.0.3, html-1.0.1.2, integer-0.1.0.1,
>    mtl-1.1.0.2, network-2.2.1.4, old-locale-1.0.0.1, old-time-1.0.0.2,
>    packedstring-0.1.0.1, parallel-1.1.0.1, parsec-2.1.0.1,
>    pretty-1.0.1.0, process-1.0.1.1, random-1.0.0.1,
>    regex-base-0.72.0.2, regex-compat-0.71.0.1, regex-posix-0.72.0.3,
>    rts-1.0, stm-2.1.1.2, syb-0.1.0.1, template-haskell-2.3.0.1,
>    time-1.1.2.4, utf8-string-0.3.6, xhtml-3000.2.0.1, zlib-0.5.0.0
>
> However, I tried to force the version I use to be 0.9.1.6 and it does
> not work as ghc itself seems to require 0.9.1.4, as pointed out by
> Ivan. I did not try to remove one or the other however.
>
> Arnaud
>
> On Thu, Jun 10, 2010 at 12:13 AM, Ivan Lazar Miljenovic
> <ivan.miljenovic at gmail.com> wrote:
>> Don Stewart <dons at galois.com> writes:
>>
>>> arnaud.oqube:
>>>> Hello,
>>>> I have a strange issue which sprang today out of nowhere. When I load
>>>> a certain file using bytestring package in Ghci using emacs, I got the
>>>> following error:
>>>>
>>>> Couldn't match expected type `Data.ByteString.Internal.ByteString'
>>>>            against inferred type
>>>> `bytestring-0.9.1.4:Data.ByteString.Internal.ByteString'
>>>>     In the second argument of `hPutStrLn', namely `(fromString msgs)'
>>>>     In a stmt of a 'do' expression: hPutStrLn cnx (fromString msgs)
>>>>
>>>> The same file compiles fine on the command-line. I have a single
>>>> installation of haskell platform, using ghc 6.10.4, on windows XP.
>>>>
>>>
>>> Looks like you might have two versions of bytestring installed (ghc-pkg
>>> list bytestring) and are attempting to combine them. The diamond
>>> dependency problem.
>>>
>>>     * delete the old version (ghc-pkg unregister)
>>
>> Isn't the old version likely to be the one that comes with GHC and hence
>> shouldn't be touched?
>>
>> --
>> Ivan Lazar Miljenovic
>> Ivan.Miljenovic at gmail.com
>> IvanMiljenovic.wordpress.com
>>
>