these 2 derivations will be built:
  /nix/store/gnypcihd2qg7i9znxd9n64wsq7ngrn0x-harmonia-deps-3.2.0.drv
  /nix/store/j73yz42ywfnv84vb13f79avsi6p9jvk2-harmonia-llvm-cov-3.2.0.drv