these 3 derivations will be built:
  /nix/store/ynlwjyqmhylfhdnph7kkchb1hqjibrdl-source.drv
  /nix/store/fn8qfybgmhck7fipnmyjb2jl68iyri95-collie-1.16.2.drv
  /nix/store/70czik76a0b3mcpr19pz16a1006wg93p-check-collie.drv