these 2 derivations will be built:
  /nix/store/gj8xrhyp83c0hsxvxbq8lrzswb9xpk4y-mardi-gras-0.36.0.drv
  /nix/store/3qxmb8gyjplq06zdy4yg6k8xk7lnj73b-check-mardi-gras.drv