these 2 derivations will be built:
  /nix/store/hw4mnsr8304a5v7q1p35ddk1rfgly9jm-closure-info.drv
  /nix/store/mqj557rya55rj0x0jv7qrmzigprj4l2f-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy