T4806a.hs:1:1: error: [GHC-87110]
    Could not load module ‘Data.Map’.
    It is a member of the package ‘containers-0.6.7’
    which is unusable because the -ignore-package flag was used to ignore at least one of its dependencies:
      deepseq-1.4.8.1 template-haskell-2.20.0.0
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.