these 3 derivations will be built:
  /nix/store/dscs2y55161v5qnywazlh7mlfnlrsqnh-source.drv
  /nix/store/xw1945361yi709kzkam0jq17fm5l9wnx-collie-1.24.1.drv
  /nix/store/kdkkfmdvjyd0610vi6zyg0m1pz60n2m0-check-collie.drv