[Haskell-beginners] Parsec 2 and Parsec 3

[John Velman]

Thanks, Jedaï.  Very helpful,

John V.

On Fri, Sep 11, 2009 at 08:44:39AM +0200, Chaddaï Fouché wrote:
> On Thu, Sep 10, 2009 at 9:36 PM, John Velman <velman at cox.net> wrote:
> > I've just started picking up Haskell where I left off a couple years ago
> > when I switched from Linux to OS X (and some other things interfered with
> > continuing my Haskell projects).
> >
> > I was using Parsec at the time -- must have been Parsec 2.
> >
> > When I loaded HOC it seemed to depend on Parsec 3, so I installed Parsec 3.
> >
> > Now -- suppose I want to use Parsec 2 for my own work.
> >
> > Is there a reasonably easy way to install Parsec 2 as, say Parsec2 and have
> > both?
> 
> You can install several version of a package, it's not a problem. You
> then have to say which version to use when compiling your code (by
> default it uses the latest version). If you want to install parsec3
> for the code that may require it and use parsec2 automatically when
> compiling your own code, use ghc-pkg to hide the version 3.
> 
> -- 
> Jedaï