these 2 derivations will be built:
  /nix/store/vpzj5yr37x9mci3q73gzrbw094ghf57z-closure-info.drv
  /nix/store/frx0wpck8842717bdfzhicwf418qqjg6-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy