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: mergestruct.m
    path of file: ./repos/coursera-machine-learning/machine-learning-ex4/ex4/lib/jsonlab
    
    the code of the file until where you have to start completion: function s=mergestruct(s1,s2)
%
% s=mergestruct(s1,s2)
%
% merge two struct objects into one
%
% authors:Qianqian Fang (fangq<at> nmr.mgh.harvard.edu)
% date: 2012/12/22
%
% input:
%      s1,s2: a struct object, s1 and s2 can not be arrays
%
% output:

    
function s=mergestruct(s1,s2)
%
% s=mergestruct(s1,s2)
%
% merge two struct objects into one
%
% authors:Qianqian Fang (fangq<at> nmr.mgh.harvard.edu)
% date: 2012/12/22
%
% input:
%      s1,s2: a struct object, s1 and s2 can not be arrays
%
% output:
%      s: the merged struct object. fields in s1 and s2 will be combined in s.
%
% license:
%     BSD, see LICENSE_BSD.txt files for details 
%
% -- this function is part of jsonlab toolbox (http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab)
%

if(~isstruct(s1) || ~isstruct(s2))
    error('input parameters contain non-struct');
end