these 5 derivations will be built:
  /nix/store/l87kynm9raz94mhmxrchs45h6yifyszn-vendor-registry.drv
  /nix/store/4a9wka62sj1lgnxvj7h7hs3nkw23rb1j-vendor-cargo-deps.drv
  /nix/store/l7llpiliqqhy4frsvgd12zmnryvkcr83-source.drv
  /nix/store/hm56l9g35yghk9fh2x62j8nk1s8533s9-harmonia-deps-3.1.0.drv
  /nix/store/0710pbvycgvplfjh911kbmfyx0rk98ad-harmonia-llvm-cov-3.1.0.drv