these 3 derivations will be built:
  /nix/store/0cl7a9z5fn7yf45dzdfhk6jslcf5halx-source.drv
  /nix/store/0m2yy10gra13nqvciq3jwyyj0cfyxi4i-collie-1.26.2.drv
  /nix/store/xcday4cwcq80ra5pichghgsrlx78vg3k-check-collie.drv