these 2 derivations will be built:
  /nix/store/b82cfm443b0c1lvhi6v3bxb78ss1rv4q-iets-0.1.0.drv
  /nix/store/h3fb0vqg1ylpnyvqla2wg9mxhzp7qi2x-iets-diff-e2e.drv