these 3 derivations will be built:
  /nix/store/z7rm2pfwxq2ypy7xbl3gz9dbx2sr9dgh-iets-0.1.0.drv
  /nix/store/lkn7wwmk6njwrl69rfbgaclk1yf2mimv-iets-conformance-adapter.drv
  /nix/store/yx9flpddadqa48xj0yizl2cqpv0fgccf-nix-conformance-iets.drv