hmm, couldn't figure out a way to login to reply. Hackage wrote:
The longer term solution is to allow installing multiple instances of
Replying to [ticket:220 duncan]: the same versions of a package built against different versions of its dependencies. This is the functional Nix approach however it would probably also require support from ghc.
Couldn't this lead to an exponential explosion in the number of package instances?
only if you *actually* install all possible combinations, which seems unlikely. If you're worried about all the old cruft hanging around taking up space, maybe looking at Nix's garbage collection and other features would be good sharing of experience. Maybe (with the user's permission) pre-emptively upgrading some things sometimes would help... not sure. -Isaac