these 3 derivations will be built:
  /nix/store/4wi96sf6y0jg04gwkhkn2nvbzzzdhlf9-iets-0.1.0.drv
  /nix/store/ckfn7i28m8c696hhyl8jim0fl9zihg9l-iets-conformance-adapter.drv
  /nix/store/6dxja2csxhv8ajdgisiifb7475cr0fyj-nix-conformance-iets.drv