these 4 derivations will be built:
  /nix/store/rjqfdiiwhvcsaw4cdls1qrn0djwpvlls-Cargo.toml.drv
  /nix/store/0yxxsgh02f3sf0w85afwzhy6mlrj4882-source.drv
  /nix/store/087z60pa216ha34dghr880xjmgahg4f4-harmonia-deps-3.2.0.drv
  /nix/store/xghfv8kvg7qzgjj2639bar9brs1wsj05-harmonia-3.2.0.drv