anchor.diff:  
         overrides = mkOption {
           default = self: super: {};
  -        type = hmTypes.overlayFunction;
  +        type = hm.types.overlayFunction;
           defaultText = "self: super: {}";
           example = literalExample ''
             self: super: rec {
  
positive.code: 
        extraPackages = mkOption {
          default = self: [];
          type = hmTypes.selectorFunction;
          defaultText = "epkgs: []";
          example = literalExample "epkgs: [ epkgs.emms epkgs.magit ]";
          description = ''
  
negative.code: with lib;
  
  let
  
    cfg = config.programs.emacs;
  
  