these 3 derivations will be built:
  /nix/store/mv7sfyvnnq3jm1q64yxf0rw4rvf0dkdy-plan.drv
  /nix/store/qn59g5arbh8di69pw28zfh0461j61nkw-init.drv
  /nix/store/r4rk3354lb9ssavfnciqfa3c8a20jbxx-nix-shell.drv