these 3 derivations will be built:
  /nix/store/9plig19aap4910n4wc756gvdi2ylzshc-source.drv
  /nix/store/jhy98d8lf4jvfzhz2sfs3wkxbg8m9dcf-harmonia-deps-3.3.0.drv
  /nix/store/rx6nms5xbdc745nlcjykvg5296p6mwka-harmonia-3.3.0.drv