these 3 derivations will be built:
  /nix/store/xcl457cs0rm46sw2lm40n6gj9vr4ib2b-source.drv
  /nix/store/ivml1f0m3r44vacj1xmxymizjkayqlg8-collie-1.20.2.drv
  /nix/store/pya310zmlj5xb2ag7vd86js6hsfl5w9c-check-collie.drv