these 6 derivations will be built:
  /nix/store/zmkhsqlblsf8slq0jq7jb4946vlz1bgl-cargo-package-libc-0.2.190.drv
  /nix/store/l7rny47r4pnsy1s0j4l1m9699f6hi553-vendor-registry.drv
  /nix/store/9s3anb44sxjqf86i05w054rgpgm6s2xl-vendor-cargo-deps.drv
  /nix/store/vwvfda4zzp1bsk27mlkrlbr27d1y34gc-source.drv
  /nix/store/6z539as1kb5f72i1brws0mra2rjqgrxs-harmonia-deps-3.3.0.drv
  /nix/store/zz241c8bbkc79zn0bhkgdw52dnb54rw2-harmonia-llvm-cov-3.3.0.drv