these 4 derivations will be built:
  /nix/store/qn60b5cnd496kg4ykvf8bd81znrnn4zx-source.drv
  /nix/store/yxpm34600gh15j5yiy1z6rvn59p5qs86-treehouse-3.1.3-go-modules.drv
  /nix/store/v0akbgxdzg9wa8fh970svdl7ikyzrmmv-treehouse-3.1.3.drv
  /nix/store/2dz4k3m8jmwbnccnki6wd0iqacqpzcs9-check-treehouse.drv