these 2 derivations will be built:
  /nix/store/y93mbqpf3f2vdfhjz3ifl31zc2w9kwcg-closure-info.drv
  /nix/store/qgm7gprg97pb0apvbzamp9vzq1jzf5kx-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy