[plt-scheme] Re: plt-scheme Digest, Vol 2, Issue 45

> module: identifier already imported (from a different
> source) in: string-upcase
> 
> I believe that mzscheme already has a string-upcase
> defined in it but then how does the SRFI 13 work?

A couple of SRFI's have name conflicts with the core mzscheme library, 
so they have alternative modules that can be imported without 
conflicting. For SRFI's 1 and 13, do this:

     (require (lib "list.ss" "srfi" "1"))
     (require (lib "string.ss" "srfi" "13"))

Dave