these 4 derivations will be built:
  /nix/store/v1f8ksnzjq85v98k1fn1z8p92lkn4kkj-Cargo.toml.drv
  /nix/store/cq1r0iv0qqzq2ar1myycq5ijkn5gppqb-source.drv
  /nix/store/yk067yq4dn2sgklq0y7wyhh1lmb16763-harmonia-deps-3.2.0.drv
  /nix/store/jl39hgggj48xw3nknfl9ks4nn8bldc0w-harmonia-clippy-3.2.0.drv