these 2 derivations will be built:
  /nix/store/fxbdb21mlixfd9535b9ccndml2n0ydlm-iets-deps-0.1.0.drv
  /nix/store/nnwb4npig51jwqzcr9j11ji9i9l0gcsp-iets-doctest-0.1.0.drv