these 3 derivations will be built:
  /nix/store/33mzlh1mqxx1y6xzq1ppj2l0rbdkjabi-source.drv
  /nix/store/q0rdalx1dish6rbv6nr8l5di8x3xbfx3-mcptoon-0.8.39.drv
  /nix/store/sv3kf3prmx8lb0q92qazpwgy3y4830wb-check-mcptoon.drv