these 2 derivations will be built:
  /nix/store/5ifcjwgq1rgqjh3g45m24rpgy63qkbv5-iets-0.1.0.drv
  /nix/store/24bf6rb3fngl4vh6q7kqb47k2fzb5mzs-iets-diff-e2e.drv