these 7 derivations will be built:
  /nix/store/gzbhcsk84msxk5qzwwkgjwhvp69qb7zn-cargo-src-actix-files-0.7.3.drv
  /nix/store/1ghh5m8k9p8dx1fz13nlm922bvwz578k-cargo-package-actix-files-0.7.3.drv
  /nix/store/8ykd00wx95qnfg5wk605bji9bs4cqkxr-vendor-registry.drv
  /nix/store/211mm8k9g3axxwkbpaby5kw81nxd661d-vendor-cargo-deps.drv
  /nix/store/rc4f8abfhb6iqcyhwqzpyc8dnfxiljjs-source.drv
  /nix/store/b185mw8bbygn1g7rgllr4g2xgal1rxc6-harmonia-deps-3.3.0.drv
  /nix/store/zfqv4jpri8p8smyyzlmw16p2m3p6id0p-harmonia-llvm-cov-3.3.0.drv