these 4 derivations will be built:
  /nix/store/r2qs2kf19sf03rqh11ammq4sljqrb0rx-vendor-registry.drv
  /nix/store/fyk69i3kpxsj5dlyy8vwby43880nqjmz-vendor-cargo-deps.drv
  /nix/store/zy27daf6habmi1q94223baz7ybhi8m2k-harmonia-deps-3.3.0.drv
  /nix/store/18p9dr3ly7xk7kn18fr3igl4p6by009n-harmonia-llvm-cov-3.3.0.drv