these 2 derivations will be built:
  /nix/store/d7bmxvavxw7cj02zrp1zwbgxm2092scx-iets-0.1.0.drv
  /nix/store/bwwmn23i6qii9zad3qm2gln5l8gf2hv2-iets-partest.drv