these 4 derivations will be built:
  /nix/store/zip06ms8fa6fxa11pm3isx7k8dvmhvfz-Cargo.toml.drv
  /nix/store/yhhwq7ld926vv05mnf5kilbxk7v570n4-source.drv
  /nix/store/ik6y71hq0zjcsydd4lcs8vyifq4wzfaa-harmonia-deps-3.3.0.drv
  /nix/store/bp9xdanw9js1w47247yap63lz5c4jq73-harmonia-3.3.0.drv