> So there is a compatibility module in the new syb. Unfortunately, > that won't tell you about the moves and rationale. Most of the time, > you'll want Data.Data (check "ghc -e ':browse Data.Data'" or the > Haddock pages, or google for "syb" in the libraries@ archives): > > $ ghc-pkg find-module Data.Data > c:/ghc/ghc-6.11.20081004\package.conf: > base-4.0.0.0
Thanks a lot Claus and José for the info. Since all I use is the Data and Typeable classes (presumably like so many others, which I guess was the reason to keep these in base), it would obviously be better for me to avoid linking to the new syb package when I don't have to. > $ ghc -ignore-dot-ghci -e ':info Data.Data.Data' Somehow I find this name hilarious. :-) > > .. I would prefer to use the new > > base-4 when possible. The cabal file already includes a conditional > > "if flag(splitBase)" to handle really old versions, I guess what I'm > > asking for is something similar for this case. Is there a splitSyb > > flag or some such? > > > > I was wondering whether there is a way to set user-defined flags > depending on whether some package is available. Then I recalled > that flags don't work the way I expected - instead Cabal will try > all flag settings to find a buildable configuration (a fact I only became > aware of when a different kind of flag was added recently that does > behave the way I expected;-). Which might be what you want in this case. > Duncan: is this correct, and are these subtleties documented somewhere? While these things would be good to know in general, it seems this is not what I want in this case, since I don't want to use the syb package after all. It seems instead what I want is to simply make a conditional import of either Data.Generics or Data.Data based on which version of base is available. I guess that means more CPP heresy, sigh. Thanks, /Niklas _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users