[nix-shell:~/work/src/haskell/hpfp/Chapter-14/wordnumber]$ ghci
GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help
Loaded package environment from /home/hs-user/work/src/haskell/hpfp/Chapter-14/wordnumber/.gh
c.environment.x86_64-linux-8.6.5
Prelude> import Test.Hspec

<no location info>: error:
    Could not load module ‘Test.Hspec’
    It is a member of the hidden package ‘hspec-2.6.1’.
    You can run ‘:set -package hspec’ to expose it.
    (Note: this unloads all the modules in the current scope.)
Prelude> :set -package hspec
package flags have changed, resetting and loading new packages...
Prelude> import Test.Hsepc

<no location info>: error:
    Could not find module ‘Test.Hsepc’
    Perhaps you meant Test.Hspec (from hspec-2.6.1)
Prelude> import Test.Hspec
Prelude Test.Hspec> :q
Leaving GHCi.