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

No file, test, or entry point is named in the issue. Start by locating how positional values are handled; done means determining whether extra values are rejected with an error and help displayed.

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