[Haskell-beginners] Why does this work in a program, but cause a seg fault in ghci?

[Daniel Fischer]

On Wednesday 11 August 2010 08:46:27, Kurt Häusler wrote:
> On Wed, Aug 11, 2010 at 5:56 AM, Maciej Podgurski
>
> <maciej.podgurski at googlemail.com> wrote:
> > What system are you on?
>
> It was a mixture of an old darwin port of 6.10.4 that I had forgotten
> about, and came first in my path, and the second most recent Haskell
> platform on Mac OS.
>
> I deleted the darwin port, and updated the Haskell platform and now it
> works as expected.
>
> I am a bit worried there might be a few nasty surprises hiding in my
> .cabal though, but there doesn't seem to be a command to force a
> recompilation of everything installed by cabal so for now I will
> assume it is not necessary.

ghc-pkg check

should tell you about broken packages. Anything it reports as broken, you 
should reinstall. When ghc-pkg check reports no breakages, you can assume 
everything works (no guarantees, though).