default.nix

{ config, lib, pkgs, ... }:

{

  options.our.test = {
    enable = lib.mkEnableOption "test";

    opt = lib.mkOption {
      type = lib.types.attrs;
      default = {};
    };

  };

  config = lib.mkIf config.our.test.enable
#    (lib.mkMerge []); # works
    (lib.mkMerge (map (d: {}) (lib.attrValues config.our.test.opt))); # infinte recursion
}