these 4 derivations will be built:
  /nix/store/a2ifiirjm2yv9mgmfngxsawp36kkchpp-Cargo.toml.drv
  /nix/store/b36m5jd3xks4bd3gp5c1sbaxyx9mg8yv-source.drv
  /nix/store/y208j7cqx8c8b3czac9651a9ib89crlk-harmonia-deps-3.2.0.drv
  /nix/store/kz8m5883crcaqg5g6rkp34imda1wfirk-harmonia-3.2.0.drv