Reminder about hard questions about GHC (was [Haskell-cafe] Temporarily overriding Data.Generics)

Robin Green greenrd at
Wed Feb 4 16:33:15 EST 2009

For low-level or obscure questions about GHC such as this, it might be
better to use glasgow-haskell-users at There are one or two
people who don't read haskell-cafe because it's so busy (and they're so

On Wed, 4 Feb 2009 22:54:15 +0100
Deniz Dogan <deniz.a.m.dogan at> wrote:

> Hi
> I'm currently working on "hacking" Data.Generics for my master thesis.
> I'm basically trying to find out whether it can be made a bit faster
> using e.g. rewrite rules. The problem I'm having is that I need an
> easy way to import my own modified version of Data.Generics (currently
> located in the same directory as my testing program) without
> unregistering or hiding syb- as base seems to depend on it.
> I've read the GHC user manual trying to find nice ways to do this
> using a bunch of different parameters to ghc, but I can't figure it
> out. Does anyone here know?

More information about the Haskell-Cafe mailing list