these 2 derivations will be built:
  /nix/store/8dyid13lk89j6wfl7yqlkd2z54cc6lkk-harmonia-deps-3.3.0.drv
  /nix/store/lg6hdd6apywnl3pi091w1j1m4y6ja6z1-harmonia-llvm-cov-3.3.0.drv