On Sun, Oct 12, 2008 at 03:40:53PM +0200, Henning Thielemann wrote: > > ... and erm, how can I enable parsing of optimizer rules? > With {-# OPTIONS_GHC -O #-} ? Yes, although note that Cabal passes -O by default. I'd recommend not putting it in a pragma, as that will break ./Setup configure --disable-optimization Thanks Ian