these 6 derivations will be built:
  /nix/store/5dnswi5b6mbdxs9zxasqy64j5qzywnhx-source.drv
  /nix/store/7sbzp7rlwax0xbh3mx33s1m1pk704w1y-cargo-package-serde_json-1.0.151.drv
  /nix/store/z0dlwr30n62i73434vhcha356wadq9a2-vendor-registry.drv
  /nix/store/74bnkyf08s66yz911qnnikspffjnnj5g-vendor-cargo-deps.drv
  /nix/store/sk55hxl1yamp3mpvqzr7glyfkac40iv5-harmonia-deps-3.1.0.drv
  /nix/store/hp9vzaykx0rmx125pn3lj61lg0x9iwwv-harmonia-llvm-cov-3.1.0.drv