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: subsasgn_check_funhandle.m
    path of file: ./repos/spm/matlabbatch
    
    the code of the file until where you have to start completion: function sts = subsasgn_check_funhandle(val)

% function sts = subsasgn_check_funhandle(val)
% Return true if val is either empty, or a function or function handle.
% One could also check for nargin == 1 and nargout == 1.
%
% 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


    
function sts = subsasgn_check_funhandle(val)

% function sts = subsasgn_check_funhandle(val)
% Return true if val is either empty, or a function or function handle.
% One could also check for nargin == 1 and nargout == 1.
%
% 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: subsasgn_check_funhandle.m 1764 2008-05-30 13:09:40Z volkmar $

rev = '$Rev: 1764 $'; %#ok

sts = isempty(val) || isa(val, 'function_handle') || ...
    (ischar(val) && (any(exist(val) == 2:6) || ~isempty(which(val))));
if sts && isa(val, 'function_handle')
    try
        f = functions(val);
    catch
        % fail silently if "functions" evaluation fails, keep sts == true
        return;
    end