these 2 derivations will be built:
  /nix/store/35yqcgq9y8ddmdjlkglrv284amkwr7yl-closure-info.drv
  /nix/store/plwavcq761zi5n3vfd5iy9qvdsy704sz-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy