these 4 derivations will be built:
  /nix/store/pdlbjmqqk9r77dwdsjj816vhd7sclnah-source.drv
  /nix/store/dfyl1yxycgb2zn88waw1dss7xi4jd91c-treehouse-3.1.3-go-modules.drv
  /nix/store/vshjihmn8rvwn6slv1kvc9i5nmbqi3dy-treehouse-3.1.3.drv
  /nix/store/kl4qnnzi0macjp85prq23giqx31xqksc-check-treehouse.drv