Re: [Haskell-cafe] "Could not find module ... which is hidden" problem

alexander.dunlap:

Is the "random" package in the build-depends of your cabal file? If not, that's why it's hidden. Cabal hides all of the packages that aren't listed in build-depends so that you can't accidentally depend on something that you don't list.

Yes, looks like he was using HCL 1.2 -- well spotted! Try building HCL 1.3 http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HCL