these 2 derivations will be built:
  /nix/store/zz5mlyrgf4z729am8kky7qgf8ncfjii2-harmonia-deps-3.2.0.drv
  /nix/store/i697xlmvjv291k0v4n3vrpg24vik4qy3-harmonia-llvm-cov-3.2.0.drv