[racket] nested require modules and global variable

How about this?
http://d.hatena.ne.jp/niitsuma/20081113/1324207362
I add some comment

2011/12/18 Danny Yoo <dyoo at cs.wpi.edu>:
>
>
> On Saturday, December 17, 2011, Niitsuma Hirotaka
> <hirotaka.niitsuma at gmail.com> wrote:
>> Is this valid behavior?
>>
>
> The sub.scm file you posted looks malformed, so some copy-and-paste error
> probably happened.
>
> Otherwise, can you also say what you expected to see?