these 4 derivations will be built:
  /nix/store/gxs955pbxa1nlyj1b88cnlvkgj5pmwcw-Cargo.toml.drv
  /nix/store/3qm2b6afjaxa1g155yh06zh9z75rmfxc-source.drv
  /nix/store/hf01jbz9x3h6xawwqdhcdrhf17a5m98z-harmonia-deps-3.3.0.drv
  /nix/store/hpfmb1fnbdbr9hb807q65j8gqb7nl5pb-harmonia-3.3.0.drv