these 3 derivations will be built:
  /nix/store/5w7dpdmhgqh2m53smhd5x91flhdyb45i-source.drv
  /nix/store/h7lcljv8x5df5mx8cch9cbdy6g64pr59-mardi-gras-0.30.1-go-modules.drv
  /nix/store/vlb36awpdf4vysirywqydkgvj28k7liv-mardi-gras-0.30.1.drv