these 2 derivations will be built:
  /nix/store/ivh4h1ydsba2y9k2q161b432vipjmp44-iets-deps-0.1.0.drv
  /nix/store/czi0zs2mb6w8vdjxfxdxngv9scwzvk6s-iets-doctest-0.1.0.drv