these 2 derivations will be built:
  /nix/store/37l3cw5awml4l0bdhvjfgdsdr0c66ykd-iets-0.1.0.drv
  /nix/store/jibf84qbvjyp9d13rzbfrk1bpr499gk9-iets-diff-e2e.drv