Cabal sandboxes and GHCi support

Cabal (and cabal-install) 1.18.0 is out and so are some fantastic improvements to make Haskell even more awesome.

To get it, just update:

$ cabal update
$ cabal install Cabal-1.18.0 cabal-install-1.18.0

Here's how working on a package might look like using the new features:

# Only once:
$ cabal sandbox init
$ cabal install --only-dependencies --enable-tests
# Play around with the code in GHCi:
$ cabal repl

More about the user visible changes:

http://coldwa.st/e/blog/2013-08-21-Cabal-1-18.html