these 2 derivations will be built:
  /nix/store/kp8ry9zh5zmwn3z87bsb9s336a9gcfcd-closure-info.drv
  /nix/store/rm2s3nkvb56ms17kqp2mx7jwvbnyzlxs-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy