this derivation will be built:
  /nix/store/lxrgf5g1gqcqmhfiks0rcb4i4m9mcqch-treefmt-check.drv
building '/nix/store/lxrgf5g1gqcqmhfiks0rcb4i4m9mcqch-treefmt-check.drv'
treefmt-check> treefmt v2.5.0traversed 716 files
treefmt-check> emitted 494 files for processing
treefmt-check> formatted 494 files (1 changed) in 4.603s
treefmt-check>  M hosts/mali/opencloud-home.nix
treefmt-check> diff --git a/hosts/mali/opencloud-home.nix b/hosts/mali/opencloud-home.nix
treefmt-check> index 0fdcbc7..72fd044 100644
treefmt-check> --- a/hosts/mali/opencloud-home.nix
treefmt-check> +++ b/hosts/mali/opencloud-home.nix
treefmt-check> @@ -11,20 +11,18 @@ in
treefmt-check>  {
treefmt-check>    options.modules.services.opencloud.maliStorage = lib.mkOption {
treefmt-check>      type = lib.types.nullOr (
treefmt-check> -      lib.types.submodule (
treefmt-check> -        _: {
treefmt-check> -          options = {
treefmt-check> -            dataset = lib.mkOption {
treefmt-check> -              type = lib.types.str;
treefmt-check> -              description = "ZFS dataset containing this OpenCloud instance's data.";
treefmt-check> -            };
treefmt-check> -            dataDir = lib.mkOption {
treefmt-check> -              type = lib.types.str;
treefmt-check> -              description = "Mountpoint for this OpenCloud instance's data dataset.";
treefmt-check> -            };
treefmt-check> +      lib.types.submodule (_: {
treefmt-check> +        options = {
treefmt-check> +          dataset = lib.mkOption {
treefmt-check> +            type = lib.types.str;
treefmt-check> +            description = "ZFS dataset containing this OpenCloud instance's data.";
treefmt-check>            };
treefmt-check> -        }
treefmt-check> -      )
treefmt-check> +          dataDir = lib.mkOption {
treefmt-check> +            type = lib.types.str;
treefmt-check> +            description = "Mountpoint for this OpenCloud instance's data dataset.";
treefmt-check> +          };
treefmt-check> +        };
treefmt-check> +      })
treefmt-check>      );
treefmt-check>      default = null;
treefmt-check>      description = "Mali storage and NFS export for one OpenCloud instance.";
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