these 3 derivations will be built:
  /nix/store/xy5vjgnmrlq106ik3lpbah9riad9g4j6-iets-0.1.0.drv
  /nix/store/cll08hxfbakn47gbg6r23kbrch354kxk-iets-conformance-adapter.drv
  /nix/store/d40x65dg9ksv18sryyhkkrnp154r0b01-nix-conformance-iets.drv