these 3 derivations will be built:
  /nix/store/nal19ckpyj9cw0hpnj6yah3fz72qih9s-source.drv
  /nix/store/nzjmhas555gq8n9v6aw7ds9avvx2sav2-mcptoon-0.8.31.drv
  /nix/store/s2839y30f69c7v3g064mvms6arl4gwsg-check-mcptoon.drv