these 2 derivations will be built:
  /nix/store/i5y4ivqbycb4gn15rpv5iwmgcryk8cr4-closure-info.drv
  /nix/store/760hbnq4fcmvb0qqky68cvi5zslz7ax9-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy