these 3 derivations will be built:
  /nix/store/byi883viwsvdc0hzg614ndnkacwbpasr-iets-0.1.0.drv
  /nix/store/21b5ra61c7ddb86xh67vh28c55wbqrqx-iets-conformance-adapter.drv
  /nix/store/1116l8j5yiyj0qbfzsk61rcc5yabxbni-nix-conformance-iets.drv