these 5 derivations will be built:
  /nix/store/wib813pn5vhvl28jpp1s3f3ss0sb0z62-vendor-registry.drv
  /nix/store/cv7c1mr261rbj6c6h3vl2mdp0yk90hk5-vendor-cargo-deps.drv
  /nix/store/j3scksgs5xkg5z0kzb6r20yx6ndvqvvr-source.drv
  /nix/store/9myjmjm6x1v0fajjk4rcngifi1cvxq1g-harmonia-deps-3.1.0.drv
  /nix/store/g1gvwyknssdcz1w5hn2amaix221xsrp1-harmonia-llvm-cov-3.1.0.drv