$ cabal install cabal-dev
$ ./bin/setup-koans
This may take time.
$ ./bin/basic-functions-koans
This tells you what to do. Modify test/BasicFunctions.hs's replaceValues to let the test passes.
$ ./bin/list-koans
$ ./bin/basic-io-koans
$ ./bin/currification-koans
$ ./bin/parserc-koans