these 3 derivations will be built:
  /nix/store/vcx541x1fm1v62i13i5cimmw6awaixnp-source.drv
  /nix/store/h071nf356sdwxg9ab4cxy5r1l36mdq1c-collie-1.27.4.drv
  /nix/store/hi5p9vghsajd72g4b2g9m2w12m20ywy6-check-collie.drv