these 6 derivations will be built:
  /nix/store/dgiwvaqvi7mhzdcx2xn1wlkllvc5h03c-cargo-package-bstr-1.13.0.drv
  /nix/store/104yhmivh61h07maf8c2qgm0sykg5vc7-vendor-registry.drv
  /nix/store/0qycgkz0v54naq9lbcqfa6zf5q7qhdv3-vendor-cargo-deps.drv
  /nix/store/jc5lb248lvcb3rmn9wi22m0pfbp61iis-source.drv
  /nix/store/pj6msk3qrk8wm0b57brv7rc4v6nv68ys-harmonia-deps-3.1.0.drv
  /nix/store/lqb6mp0f07cqn5h7fhw7xrcwzhgz6wkp-harmonia-llvm-cov-3.1.0.drv