these 3 derivations will be built:
  /nix/store/cmirgxc1mbgnvczn7g9rfm7s30lkylcn-iets-0.2.0.drv
  /nix/store/v9ws6gvqksifiqqcip1ndgcg20qng9y8-iets-conformance-adapter.drv
  /nix/store/xwd4n1f6fb5x0dm70n6mji67wl35wbvi-nix-conformance-iets.drv