Failed to load interface

[andrewthad]

I use doctests in the ip package. With version 0.8.7 (and probably with others), running stack test causes everything to run successfully. If instead, I run:

cabal new-build --enable-tests
./dist-newstyle/build/ip-0.8.7/build/doctest/doctest

It fails. I get a lot of Failed to load interface errors:

src/Net/IPv4.hs:30:1: error:
    Failed to load interface for ‘Net.Types’
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:34:1: error:
    Failed to load interface for ‘Data.Hashable’
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:35:1: error:
    Failed to load interface for ‘Data.Aeson’
    Perhaps you meant Data.Version (from base-4.9.0.0)
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:37:1: error:
    Failed to load interface for ‘Net.Internal’
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:39:1: error:
    Failed to load interface for ‘Data.Text.Internal’
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:43:1: error:
    Failed to load interface for ‘Data.Vector.Generic.Mutable’
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:44:1: error:
    Failed to load interface for ‘Control.Monad.Primitive’
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:45:1: error:
    Failed to load interface for ‘Net.Internal’
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:46:1: error:
    Failed to load interface for ‘Data.Text.Lazy’
    Perhaps you meant
      Data.Map.Lazy (from containers-0.5.7.1)
      Data.STRef.Lazy (from base-4.9.0.0)
    Use -v to see a list of the files searched for.

src/Net/IPv4.hs:47:1: error:
    Failed to load interface for ‘Data.Text.IO’
    Use -v to see a list of the files searched for.

I'm guessing that the GHCi environment that doctest ends up using is missing almost everything. How can I prevent this from happening? The reason this is actually a problem for me is that on nixpkgs, my tests fail. This can be easily confirmed by running:

nix-build -p "haskellPackages.ip"

Granted, nix actually uses cabal build instead of cabal new-build but I still run into the problem of missing packages.