these 4 derivations will be built:
  /nix/store/y8i3k1axi9bkcjgn2aa53i5b3r3vahin-crate-rss-2.1.2.tar.gz.drv
  /nix/store/64a551nldwbzyp0bv7k34kjvd3b5551j-rss-2.1.2.drv
  /nix/store/0qnydlmick5niir7hxigzj0nsw1a0xzi-cargo-vendor-dir.drv
  /nix/store/z5rn64h4y7xhimyzn3gvpf2fdzl8w1dq-citiesapp-frontend.drv