these 5 derivations will be built:
  /nix/store/0rvjayksbslicv5dw8pmhjnj7zncdkpi-source.drv
  /nix/store/r3rjx2i5a3aj39g0q00hgg41q5gqmypc-vendor-registry.drv
  /nix/store/khlpn48hkikn1sqfdagycw2ks6b5k7ks-vendor-cargo-deps.drv
  /nix/store/w703ajx9a065bjcjvfvnjr3437w5jac9-harmonia-deps-3.3.0.drv
  /nix/store/npgkirxlwpzfyawx70ldvy8ljsax9ya3-harmonia-llvm-cov-3.3.0.drv