How to avoid any values ?

Hello

I have a console program to create, and I have only options.
How can I do to raise an error and display help when I have some values instead of options ?

Example :
```
MyProgram --option1 --> is ok
MyProgram value1 --> I have to inform user that no values are allowed (and display help)
```

Thanks for advance.
Sybaris

issue 中没有指定文件、测试或入口点。先定位位置值的处理方式；确定额外值是否会因错误而被拒绝并显示帮助信息，即视为完成。

由索引模型根据 Issue 内容生成。