these 2 derivations will be built:
  /nix/store/y2i80lv461m1j0vsknqzphp9xg8myilj-hol-guard-3.4.3.drv
  /nix/store/r88g9l4cdcjvja3zp1j9q62rggmqnciw-check-hol-guard.drv