these 2 derivations will be built:
  /nix/store/qpmkqc4w3qz6dsxgvg98vq5dyp5mbiqi-closure-info.drv
  /nix/store/0j00d6fz63abh6h9qrknkvdg9sprkj1y-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy