these 3 derivations will be built:
  /nix/store/8k9ghrqclj1qbgmnp2vy9wwkvzg03n0x-source.drv
  /nix/store/cp5b0v88011jkvifqvh8a0d84a3rqcq3-harmonia-deps-3.2.0.drv
  /nix/store/khz0ngnv09vb4hss80kjfn9csrvm3fgl-harmonia-3.2.0.drv