these 4 derivations will be built:
  /nix/store/z2z9n7zppbpkihc64qr1maag7wp08bma-Cargo.toml.drv
  /nix/store/wvkmqqfvkqz71s3n5wdxajgxmqvbcsji-source.drv
  /nix/store/m9zsf9flng7m98zd11d2292fq79qbiif-harmonia-deps-3.2.0.drv
  /nix/store/f0vzmbj2f95lzg41ak8fsxh70in9b7n2-harmonia-3.2.0.drv