Could not load module ‘Database.Postgres.Temp’ It is a member of the hidden package ‘tmp-postgres-1.34.1.0’. Perhaps you need to add ‘tmp-postgres’ to the build-depends in your .cabal file. Use -v (or `:set -v` in ghci) to see a list of the files searched for. | 31 | import qualified Database.Postgres.Temp as Tmp | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^