these 3 derivations will be built:
  /nix/store/6vf9l2bxdxznccza6pcnmc0183lzmag6-iets-0.1.0.drv
  /nix/store/1i3idfa9jw6hbzg4qk5yigsnipzdlf9b-iets-conformance-adapter.drv
  /nix/store/3dsn33k60isqmd6lvxncsz5sp2v6d144-nix-conformance-iets.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy