these 2 derivations will be built:
  /nix/store/crjvyis3b4gviy4lcsn8agki7vprn1m6-iets-0.1.0.drv
  /nix/store/c3mxbn5drf957yqiy3hmm8lk0aqr38vy-iets-diff-e2e.drv