these 2 derivations will be built:
  /nix/store/bzqq2lmmabaaw28mxm1w8q1q4hk02gi4-iets-0.1.0.drv
  /nix/store/zw807laa9z0xi7lrgvqlfv85hfksm8n4-iets-diff-e2e.drv