this derivation will be built:
  /nix/store/lxrgf5g1gqcqmhfiks0rcb4i4m9mcqch-treefmt-check.drv
error: Cannot build '/nix/store/lxrgf5g1gqcqmhfiks0rcb4i4m9mcqch-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/7rkj86v2lxl45lylg8y1fz4hip86x7wn-treefmt-check
       Last 25 log lines:
       > -            dataset = lib.mkOption {
       > -              type = lib.types.str;
       > -              description = "ZFS dataset containing this OpenCloud instance's data.";
       > -            };
       > -            dataDir = lib.mkOption {
       > -              type = lib.types.str;
       > -              description = "Mountpoint for this OpenCloud instance's data dataset.";
       > -            };
       > +      lib.types.submodule (_: {
       > +        options = {
       > +          dataset = lib.mkOption {
       > +            type = lib.types.str;
       > +            description = "ZFS dataset containing this OpenCloud instance's data.";
       >            };
       > -        }
       > -      )
       > +          dataDir = lib.mkOption {
       > +            type = lib.types.str;
       > +            description = "Mountpoint for this OpenCloud instance's data dataset.";
       > +          };
       > +        };
       > +      })
       >      );
       >      default = null;
       >      description = "Mali storage and NFS export for one OpenCloud instance.";
       For full logs, run:
         nix log /nix/store/lxrgf5g1gqcqmhfiks0rcb4i4m9mcqch-treefmt-check.drv