these 2 derivations will be built:
  /nix/store/q4cg6ywclp832s9n53gqnjk5gc315a0y-mardi-gras-0.36.0.drv
  /nix/store/0c40dd4wb2rw545zda9vn8bq1iv906j7-check-mardi-gras.drv