these 3 derivations will be built:
  /nix/store/f2wjfjv688iwapgkpagh2ml64p5zdi1x-source.drv
  /nix/store/rbr4agrpjl9d6vz3b6vq3ff2dfw6n07r-mcptoon-0.8.22.drv
  /nix/store/wscnhscqyphl5ja84gr9wkqnxxcq09by-check-mcptoon.drv