these 2 derivations will be built:
  /nix/store/ims02kfhvx7sllp8ds297fn0z4d5g4l7-iets-0.1.0.drv
  /nix/store/f4mvxy6xpm2bccdb0qmw4mbdys0y2hiv-iets-diff-e2e.drv