time   calls  line
                108 function status = request_close_helper(h,pre_or_post)
                109 % When called with a valid figure handle and the flag 'pre', this stores
                110 % current figure and current state of hidden handles in persistent variables
                111 % for easy restoration.
                112 % When called with any 1st input and the flag 'post', this restores
                113 % current figure and the state of hidden handles.
                114 % If called with the flag 'pre' twice without an intervening call with flag
                115 % 'post', a warning is thrown, the passed in handle is deleted, and status
                116 % returned is false.
                117 
            34  118 persistent closeVisitedHandles; 
            34  119 persistent old_shh; 
                120 
            34  121 switch pre_or_post 
            34  122  case 'pre' 
                123   % prevent recursion
            17  124   if ismember(h, closeVisitedHandles) 
                125       % Throw the warning. Allow users to turn off the warning using the ID.
                126       warning('MATLAB:Figure:RecursionOnClose', ...
                127               'A callback recursively calls CLOSE.  Use DELETE to prevent this message.');
                128       delete(h)
                129       status = false;
                130       return;
                131   end
                132 
            17  133   if ~checkfigs(h) 
                134       error('MATLAB:close:assert','Unexpected invalid handle passed to request_close_helper')
                135   end
                136 
            17  137   old_shh{end+1} = get(0,'ShowHiddenHandles'); 
            17  138   set(0,'ShowHiddenHandles', 'on') 
            17  139   set(0,'CurrentFigure', h) 
            17  140   closeVisitedHandles = [closeVisitedHandles, h]; 
            17  141   status = true; 
            17  142  case 'post' 
                143   % we don't want to restore gcf here as the CloseRequestFcn
                144   % may have changed it on purpose
            17  145   set(0,'ShowHiddenHandles', old_shh{end}) 
            17  146   old_shh(end) = []; 
            17  147   closeVisitedHandles(closeVisitedHandles==h) = []; 
            17  148   status = true; 
                149  otherwise
                150   error('MATLAB:close:assert','Unexpected value passed to request_close_helper')
                151 end

Other subfunctions in this file are not included in this listing.