these 3 derivations will be built:
  /nix/store/gbhp3y618q1p5i515v61nkasyj0q40ha-source.drv
  /nix/store/33v15h7haza1abhs3qvi0dkryjsnndhd-hax-0.7.0.drv
  /nix/store/v4916xwm0r4cbfabihad6kdcw2qqi332-check-hax.drv