You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: cat.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/matlabbatch/@cfg_item
    
    the code of the file until where you have to start completion: function varargout = cat(varargin)

% function varargout = cat(varargin)
% Prevent cat for cfg_item objects.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: cat.m 1862 2008-06-30 14:12:49Z volkmar $

rev = '$Rev: 1862 $'; %#ok

if nargin > 2

    
function varargout = cat(varargin)

% function varargout = cat(varargin)
% Prevent cat for cfg_item objects.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: cat.m 1862 2008-06-30 14:12:49Z volkmar $

rev = '$Rev: 1862 $'; %#ok

if nargin > 2
    cfg_message('matlabbatch:cfg_item:cat', ['Concatenation of cfg_item objects is ' ...
                    'not allowed.']);
else
    varargout{1} = varargin{2};
end