these 5 derivations will be built:
  /nix/store/8ixsfbrq5c8j15jg76m4x6361j1jzn56-vendor-registry.drv
  /nix/store/1apry9hng8rpc09lpwx6p1z4md9my6n0-vendor-cargo-deps.drv
  /nix/store/956jc6rhqpabjqkd19c8qm39xp0108lc-source.drv
  /nix/store/23kgdgp0607saxnhsj6zgb0m74ibw054-harmonia-deps-3.3.0.drv
  /nix/store/wmh4p54yxkb0m61r34pfk7wlx5y3zmnh-harmonia-llvm-cov-3.3.0.drv