these 2 derivations will be built:
  /nix/store/jccw7p7ig5i5dqfg3agqmkgr5qyv3q05-iets-0.1.0.drv
  /nix/store/q4ivz3xds1x053dqqfxw0a6fx71kxphx-iets-partest.drv