these 2 derivations will be built:
  /nix/store/a4r4x9j8s9x1lxxc21hpxpkxznrllmfq-closure-info.drv
  /nix/store/7h9a431rjhakr8ssc3302sj8f6yz1dzk-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy