these 3 derivations will be built:
  /nix/store/m18nshfabmrb9q8g2gi9z9hxg59g8nba-source.drv
  /nix/store/44dfalsfip7pp3vyxxpxgsxx5lpjnprq-collie-1.24.0.drv
  /nix/store/hd9vbxicv1ycg0zk6n3lvbgyayk2hhvz-check-collie.drv