these 4 derivations will be built:
  /nix/store/kvniz0b89417cb5w44b6v02kvyw3d1vw-source.drv
  /nix/store/i12wy0ssj1j7bbaig8d2irmamfn26qqf-treehouse-3.1.4-go-modules.drv
  /nix/store/h1jkwdnqjg6c8kml5yi49r4zwvbs22cq-treehouse-3.1.4.drv
  /nix/store/lpc78s6madjq0pm2qynq4kg6lkn39k91-check-treehouse.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy