This directory contains two packages, external-package-demo and external-package-user, the
second one depends on the first one. Both packages were created with cabal init.
external-package-demo was uploaded to local Hackage at localhost and 01-index.tar.gz from that
Hackage was downloaded to this directory. Then the index file was processed with hackage-to-nix,
the result is in hackage/ directory.
The tests check that cabalProject' is able to construct plan with dependencies from extra Hackage
and then build the package itself.