these 3 derivations will be built:
  /nix/store/7r4a0hpf8m4r3db6pxnd2czwkjcswc12-source.drv
  /nix/store/wvwk2mq3z8d3vqlry437l06aim9a1bm2-harmonia-deps-3.2.0.drv
  /nix/store/c99ka6jw6gf51bh2h5ymfxzr63si3338-harmonia-3.2.0.drv