these 3 derivations will be built:
  /nix/store/vg5fzr7gmx9z9zqcdq07a8167gkzsbmm-source.drv
  /nix/store/xy8m6c4kzbhv1ivy9axw4iajjkj8gks7-collie-1.12.0.drv
  /nix/store/i2b4v2pwmlldr8gsg6x88crx1411q41h-check-collie.drv