these 3 derivations will be built:
  /nix/store/mm3b37dfnmmwjfmx5lf5wl1pcf48xy6x-iets-0.1.0.drv
  /nix/store/g8pn56dmm0n7xbphvxa9lcinr3qbvzcp-iets-conformance-adapter.drv
  /nix/store/iz012dcbsi2pfn6a9hq1ab494z5hy14g-nix-conformance-iets.drv