these 2 derivations will be built:
  /nix/store/q320010f6sl6cr7wzk8ziqr9h3yxh5ji-iets-deps-0.2.0.drv
  /nix/store/brkdflavl687jnrf5jqqxnxg7vgaasmk-iets-doctest-0.2.0.drv