these 4 derivations will be built:
  /nix/store/3yz89gdvisrgp8lpx64gnisi0j51h5py-Cargo.toml.drv
  /nix/store/225si5cphbvw7j80c275bwlsp00q756s-source.drv
  /nix/store/xclc32wmr4h0cvsjc4bhl0dxxp86v06q-harmonia-deps-3.3.0.drv
  /nix/store/ndr3qdlpwfiixyq02ya5wwpjvpmjjkjp-harmonia-3.3.0.drv