these 3 derivations will be built:
  /nix/store/c5bl8b5bz0nlw5c67hg6hnj3k0iwrgkh-iets-0.1.0.drv
  /nix/store/q0sw1d2cn8psnbiacbrdah7pg125qlxy-iets-conformance-adapter.drv
  /nix/store/4jipnr2jj86yyv5497dndfmv0i2jxkbb-nix-conformance-iets.drv