Cabal and testing

Hi I'm just about to hook up Cabal for doing some testing, so I started with the obvious template: import Distribution.Simple main = defaultMainWithHooks defaultUserHooks{runTests=test} test :: Args -> Bool -> PackageDescription -> LocalBuildInfo -> IO ExitCode test args bool pd lbi = return ExitSuccess A few questions about this interface: 1) What on earth is "bool"? Perhaps either a haddock comment, or a type alias would make it more clear. 2) If the tests fail to run, ExitFailure would be appropriate. If the tests run and pass then ExitSuccess seems sensible. If the tests run, but fail, what should be returned? 3) On failure should I "print" something, or just "error" out? Thanks Neil