these 2 derivations will be built:
  /nix/store/2f10g0zjm0ydd0w21g6g3wfnd8c5bp0n-iets-0.1.0.drv
  /nix/store/7izfk25sblhav21k9nld9i28bkrzxr6w-iets-diff-e2e.drv