[Rayne]

The global package index meant (for me) that pretty much everything I installed broke something else I needed. Once they've got the sandbox stuff working (and when you can start a repl in that sandbox, imo it's nearly useless if you can't), it should be much better.

[cantankerous]

I think you're describing what cabal-dev does.

https://github.com/creswick/cabal-dev