these 3 derivations will be built:
  /nix/store/jsz1gw6pqx97h0k2gy1wbzyk0gpv8yml-source.drv
  /nix/store/jp0x2znana2xzijaknyshfy8k8hxphk7-mardi-gras-0.30.1-go-modules.drv
  /nix/store/kjc77vfalyzy61rvym3fwqwl87c13aap-mardi-gras-0.30.1.drv