these 2 derivations will be built:
  /nix/store/bxpl96ryw70k6r4scdina0bwi6sk3mw8-harmonia-deps-3.2.0.drv
  /nix/store/wcqnqlck433vcprisl2889zjwk3qzpd9-harmonia-llvm-cov-3.2.0.drv