these 6 derivations will be built:
  /nix/store/1pxxcm1axvwm2ppdsp39zj5m2hdq1wza-cargo-package-serde_json-1.0.154.drv
  /nix/store/zkf9llm3m6in3y64avzl754k4zk46q1h-vendor-registry.drv
  /nix/store/36zfr5rvm5dlz41b7cgs7w780fzypvja-vendor-cargo-deps.drv
  /nix/store/gqv953wcsavwlwilb8d4rg83d20j2ha8-source.drv
  /nix/store/ilza7wav4y5v0r892hl215dw41vvlr71-harmonia-deps-3.3.0.drv
  /nix/store/prinhq06d8ckyha7zfbph9d1pwnzq8l0-harmonia-llvm-cov-3.3.0.drv