these 3 derivations will be built:
  /nix/store/r2ifcacyhy93qaazixqlf6m81q9dfhq3-source.drv
  /nix/store/fgnq62qn0yg7jj9xq7mkhgh88k4dcckk-collie-1.25.2.drv
  /nix/store/iyv0jfvrgkscmhlf1z5hlslfd0pqsbxm-check-collie.drv