these 3 derivations will be built:
  /nix/store/8s1k1x9s0kf5rmw9xdgk39xpqpyw4i35-source.drv
  /nix/store/mmfkas4c4bkhr7a2p94hw7vmpfbfwln8-iets-deps-0.2.0.drv
  /nix/store/q51r441ayxl1gzrc81jg8hy23qa2lxnd-iets-nextest-0.2.0.drv