Cabal sandboxes to test a package on hackage requiring a version of base I don't have
cabal, haskell
Solution
The trouble with `base` (and a couple of other packages) is that they are tied to the GHC version you have. You can't simply install a different version of `base`, with or without sandboxes.
cabal HEAD has a flag `--allow-newer` which should help in this case. Or just bug the maintainer of `monad-journal` to relax version bounds.
Problem
I was reading this: http://devskypers.blogspot.fr/2014/02/logging-flow-activity.html And wanting to try. A simple `cabal install monad-journal` tells me that I have base 4.6.0.1 but monad-journal requires 4.5.*. I was hoping a sandbox could help, but sandboxes seem only to be for my own packages, and even then I don't really understand how it manages things. I tried making a simple cabal file for an empty package and get the note: `Note: when using a sandbox, all packages are required to have consistent dependencies. Try reinstalling/unregistering the offending packages or recreating the sandbox.` Is there any simple way to say "Install this package, and any dependencies it has, in my local sandbox so I can play around with it, ignoring whatever else I might have globally installed"? I tried --shadow-installed-packages as suggested here, but I get the same error.