these 3 derivations will be built:
  /nix/store/1yxlgfcy3b0xz6f2qwhnbp02w5bxc714-source.drv
  /nix/store/mxa9i723297ax0mzxmqpp11fc7vdvfah-harmonia-deps-3.3.0.drv
  /nix/store/4fv8kjdcar1ny2ygpp6ln86bbmq98byx-harmonia-3.3.0.drv