these 4 derivations will be built:
  /nix/store/vzib175giy4vwgh0d3s2rms5l3mf950i-Cargo.toml.drv
  /nix/store/46194qmmm0z8w68rz177c3077krl67y8-source.drv
  /nix/store/z1cb9kryszvk4bppnbn49b3c46dfgk52-harmonia-deps-3.2.0.drv
  /nix/store/59xp77n6vbd7bwajdxm5pr5mkh5x2w3x-harmonia-clippy-3.2.0.drv