these 4 derivations will be built:
  /nix/store/4wfwq0v3ilgms2gzrvajhkq7by9ya9d8-Cargo.toml.drv
  /nix/store/dparh521paypq13z9z43cnxx1ir5fcfq-source.drv
  /nix/store/a6wpbl4sii93lpbl8qih7f7s4mpkl4hr-harmonia-deps-3.2.0.drv
  /nix/store/yq020m8fiqix8vbb0ssw1xh8l6x1wdik-harmonia-3.2.0.drv