these 2 derivations will be built:
  /nix/store/si6krgdir5b6c6s497my61cf8zn6q29h-closure-info.drv
  /nix/store/9jw9nmgfkw8k0kfdhcra9sflzrm0a87g-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy