SafeLang07.hs:2:14: warning:
    -XGeneralizedNewtypeDeriving is not allowed in Safe Haskell; ignoring -XGeneralizedNewtypeDeriving

SafeLang07.hs:15:1: error:
    Could not find module ‘SafeLang07_A’
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.