Hello Artem,
With FPS i did use the library with GHC 6.4 by fetching and installing it via Cabal, and with GHC 6.6 it is shipped (thanks for that!). The same might be done to FilePath: those who need it before GHC 6.8 will fetch and install it manually (or via hackage), and those who use GHC 6.8 will have it out of the box.
P.S. I think it should be possible to install the fresh version of FPS and GHC compiler should be smart enough to link both the old version (if it is required by some other part of the base) and the new one...
well, i should explain the situation. first, there is no problem to include FPS as *separate* library in GHC and actually 6.6 provides lots of such libs (including ones that was not shipped with 6.4). you don't need to download/install these libraries too FPS is different - it was made a part of base library and this means 1) that .cabal files for libs/apps that uses fps should be different for ghc 6.4 and 6.6 2) that i can't upgrade to newer fps versions 3) that fps versions with api changes can't be used at all with 6.6! all that i propose is to detach fps from base lib and ship it as separate library *together* with ghc -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com