these 3 derivations will be built:
  /nix/store/y6dalfdkaiphgszmsq0pfwlp8zp4kw8q-iets-0.1.0.drv
  /nix/store/gxmrfgw5px4sy1nks60gb321p1x1wjha-iets-conformance-adapter.drv
  /nix/store/z1kzbhy342hwby484m3v0pl9m7dkf0mv-nix-conformance-iets.drv