these 2 derivations will be built:
  /nix/store/pdndzx3i9lh5y4a1mlfz7r83ljmafnyz-iets-0.1.0.drv
  /nix/store/aj2rkh5xknj8d3b6lzr5aw619p1bsb6w-iets-partest.drv