these 6 derivations will be built:
  /nix/store/pdjkzgxm9543rfx86b37d6xk26nr5m0q-cargo-package-toml-1.1.8+spec-1.1.0.drv
  /nix/store/lic52wzg4vxih94xcy08z8175axqsgsm-vendor-registry.drv
  /nix/store/hf149rk2a7yw2g1md99dbmak8875rv1i-vendor-cargo-deps.drv
  /nix/store/vbzvpkh45vki5p03n4m6dkf2ij510y2i-source.drv
  /nix/store/0id18ncbbdwfs9q7igwvivgz6z7wqvbr-harmonia-deps-3.3.0.drv
  /nix/store/pmf53xsilzm81nkprdy80yck5ym1961i-harmonia-llvm-cov-3.3.0.drv