these 3 derivations will be built:
  /nix/store/50179a6q6hfr3sjy37kb2vdkjv141za2-source.drv
  /nix/store/pp4r6gsxdppk7hqz5sbwdxaa42s5pnxb-collie-1.28.2.drv
  /nix/store/3mx3vxwz6gl4xlgay8klb6w3dxkkpvkg-check-collie.drv