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: parseAxisHandle.m
    path of file: ./repos/matGeom/matGeom/utils
    
    the code of the file until where you have to start completion: function [ax, varargin] = parseAxisHandle(varargin)
%PARSEAXISHANDLE Parse handle to axis, or return current axis.
%
%   Usage:
%   [ax, varargin] = parseAxisHandle(varargin{:});
%
%   Example
%   parseAxisHandle
%
%   See also 
%     isAxisHandle

% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2023-09-05, using Matlab 9.14.0.2206163 (R2023a)
% Copyright 2023 INRAE - BIA Research Unit - BIBS Platform (Nantes)


    
function [ax, varargin] = parseAxisHandle(varargin)
%PARSEAXISHANDLE Parse handle to axis, or return current axis.
%
%   Usage:
%   [ax, varargin] = parseAxisHandle(varargin{:});
%
%   Example
%   parseAxisHandle
%
%   See also 
%     isAxisHandle

% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2023-09-05, using Matlab 9.14.0.2206163 (R2023a)
% Copyright 2023 INRAE - BIA Research Unit - BIBS Platform (Nantes)

% varargin can not be empty
if isempty(varargin)
    error('Requires at least one input argument');
end