these 3 derivations will be built:
  /nix/store/ykank7afkclbvm5h2ic2vz6wh91a6dl5-iets-0.2.0.drv
  /nix/store/bfkwcgqp0cqhck4hsv5ldmfpbp5adyjv-iets-conformance-adapter.drv
  /nix/store/9hm23i9s4gb31vm36jc24ag4rr1n7d5h-nix-conformance-iets.drv