these 6 derivations will be built:
  /nix/store/yh9bmqv8v4ck70kribww6qrx9ll68a40-cargo-package-futures-core-0.3.34.drv
  /nix/store/nmd5cbsh6101n75685p5c2gjbv41pa2c-vendor-registry.drv
  /nix/store/9g39bk1114j4kw8dcbpay7k0qfdima52-vendor-cargo-deps.drv
  /nix/store/5x2b45cc3kynplw10hmmvj9qdb5x3xk3-source.drv
  /nix/store/kaynk83jkpynfm1v760fwqmr951kx6kl-harmonia-deps-3.2.0.drv
  /nix/store/32hkaw007flf21g649fsxzd2pzk1q95q-harmonia-llvm-cov-3.2.0.drv