these 3 derivations will be built:
  /nix/store/l09xdfh9x5zd8k5yz43kqskdzi3d1syy-source.drv
  /nix/store/xqj13z3nhqjcd3sijs8pbc6dl6pxcqd3-harmonia-deps-3.2.0.drv
  /nix/store/64ds726rwy92qbqqbqj7kpfgrnhkxpp0-harmonia-3.2.0.drv