Setting up exercises for haskell-platform 2013.2

[David Tchepak]

I ran into cabal dependency problems when trying to setup the
exercises after installing the latest Haskell Platform:

Test/Framework/Providers/QuickCheck2.hs:16:31:
Module `Test.QuickCheck.Test' does not export `run'
Failed to install test-framework-quickcheck2-0.2.4

I found an easy way to resolve this, although I'm not sure if it is a
good solution.

First, install cabal-dev [1], which lets us use sandboxed dependencies
for individual projects

$ cabal install cabal-dev

Next, install the course dependencies using cabal-dev.

$ cd course
course $ cabal-dev install

We can now run ghci with these sandboxed dependencies:

course $ cabal-dev ghci
GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help
Ok, modules loaded: Course, L01.Id, ...
ghci>

If we forget and run "ghci" instead of "cabal-dev ghci", we'll get a
"Could not find module `Test.Framework.Providers.QuickCheck2'" or
similar message. In that case just quit ghci, and rerun as "cabal-dev
ghci".

Hope this helps.


[1] https://github.com/creswick/cabal-dev/blob/master/README.md

[Liam McLennan]

The advice I got on irc was to favour virthualenv over cabal-dev for reasons that were not clear. I have been using it for all my projects along with a .cabal file to specify dependencies.

https://github.com/Paczesiowa/virthualenv

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Liam McLennan.

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