[plt-scheme] except-out?

(module a scheme (provide (except-out (all-from-out scheme) +)))

Chongkai

Jos Koot wrote:
> You would do me a great favor by telling what is wrong in:
>  
> (module a scheme (provide (except-out scheme +)))
>  
> Welcome to DrScheme, version 3.99.0.10-svn31jan2008 [3m].
> Language: Module.
> except-out: identifier `+' not included in nested provide spec in: scheme
>  
> Kind regards, Jos Koot
>