Could not find module ‘Test.QuickCheck’ on Mac

Question

When I try to test my code, IntelliJ gave me this error. However, I have used cabal install QuickCheck to install.

Testing.hs:3:1: error:
    Could not find module ‘Test.QuickCheck’
    Use -v to see a list of the files searched for.
  |
3 | import Test.QuickCheck
  | ^^^^^^^^^^^^^^^^^^^^^^
Failed, 0 modules loaded.

@WillemVanOnsem Resolving dependencies... All the requested packages are already installed: QuickCheck-2.10.0.1 Use --reinstall if you want to reinstall anyway. — K3大魔王, Sep 18 '17 at 15:21
Does IntelliJ use a cabal sandbox? Also, if it's building the binary via cabal then the package might be hidden. — Thomas M. DuBuisson, Sep 18 '17 at 17:56
@ThomasM.DuBuisson I don't think I'm using a cabal sandbox, I just followed regular instructions to install Haskell platform and cabal — K3大魔王, Sep 19 '17 at 04:19
Do you have QuickCheck listed as a build-dependency in your Cabal file? — Jack Henahan, Sep 19 '17 at 19:05

score 0 · Accepted Answer · answered Jan 26 '18 at 21:32

I think this is another instance of a nasty bug in the full release of the 8.2.1 Haskell-Platform binaries.

The solution is either to force reinstalls of the broken things, or simply to upgrade to the fixed release. More details were provided here: https://mail.haskell.org/pipermail/haskell-cafe/2017-October/127979.html

Could not find module ‘Test.QuickCheck’ on Mac

1 Answers1