these 15 derivations will be built:
  /nix/store/rf1lfdlmmjn0kw3043bj7p6nvf51g4xy-stub-program.drv
  /nix/store/0bzvlamjkz0w3zck2gdgzf5ka2xdj1an-effect-script.sh.drv
  /nix/store/0qgrl2cmllwsa7z2nr9s3ncgcp1f8znh-effect-script.sh.drv
  /nix/store/2yrd53ixgfmkz2p26sdaj67bpi67z5l1-effect-script.sh.drv
  /nix/store/876v9npmp6hccqsjjn7vi0qah54glsjs-effect-script.sh.drv
  /nix/store/8mc63l5n665082k9013vn5nyq2llib9z-effect-script.sh.drv
  /nix/store/bfamnxjiqbbrsw97kayzs5mdggc0rd1m-effect-script.sh.drv
  /nix/store/g9nlf53sm9lipirm1s9lwc8mx1r27r5k-effect-script.sh.drv
  /nix/store/ki56ibb7a1mhfl9ccxnm2p64dlbwh2j5-effect-script.sh.drv
  /nix/store/mf67ic6iq5fp4kpr4nfhw85f8rx6jvs3-effect-script.sh.drv
  /nix/store/mm1z812ydrprm0hh2nzacagpavh8jfi2-effect-script.sh.drv
  /nix/store/p2gyrx6h6cgb5h8q1wqrdg1kx28xl29y-effect-script.sh.drv
  /nix/store/vsra62pdljz22shwbgya7x438cv2gk43-effect-script.sh.drv
  /nix/store/wgnvypiacm9yxmchvfdaz52gy6l1437g-effect-script.sh.drv
  /nix/store/1n08di2496mdgayxsc14a1604yyl1kwa-effects-interpreter.drv