these 3 derivations will be built:
  /nix/store/gyvhd6a5k0i2sr9zdk4jh00x88c8r8qg-source.drv
  /nix/store/mdhaib1w3fn2y2yi75rsfg3wpcmrap0g-collie-1.23.2.drv
  /nix/store/fy6zi3f0rhv9s6z8l168rw710xzxq3vh-check-collie.drv