these 4 derivations will be built:
  /nix/store/wavbzj8s640lyhi2a9qjjvc1b0bcain8-source.drv
  /nix/store/c4vd4bm8zy9zhx2snahgacpnxd9dii9k-treehouse-3.1.7-go-modules.drv
  /nix/store/1dkb3dkc6rz8ph3ywg2h96c2bli1gh41-treehouse-3.1.7.drv
  /nix/store/9whw6x802kkdvlzkny84y4xd3x8z18yh-check-treehouse.drv