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: emailFeatureGUI.m
    path of file: ./repos/automagic/gui
    
    the code of the file until where you have to start completion: function varargout = emailFeatureGUI(varargin)
% EMAILFEATUREGUI MATLAB code for emailFeatureGUI.fig
%      EMAILFEATUREGUI, by itself, creates a new EMAILFEATUREGUI or raises the existing
%      singleton*.
%

    
function varargout = emailFeatureGUI(varargin)
% EMAILFEATUREGUI MATLAB code for emailFeatureGUI.fig
%      EMAILFEATUREGUI, by itself, creates a new EMAILFEATUREGUI or raises the existing
%      singleton*.
%
%      H = EMAILFEATUREGUI returns the handle to a new EMAILFEATUREGUI or the handle to
%      the existing singleton*.
%
%      EMAILFEATUREGUI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in EMAILFEATUREGUI.M with the given input arguments.
%
%      EMAILFEATUREGUI('Property','Value',...) creates a new EMAILFEATUREGUI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before emailFeatureGUI_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to emailFeatureGUI_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help emailFeatureGUI

% Last Modified by GUIDE v2.5 16-Dec-2019 11:09:43

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @emailFeatureGUI_OpeningFcn, ...
                   'gui_OutputFcn',  @emailFeatureGUI_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end