[racket] writing a define-world macro

We will add something appropriate to the teaching languages real soon now. 


On Jul 25, 2010, at 6:44 PM, Shriram Krishnamurthi wrote:

> Todd,
> 
> Danny has defined updaters for his world.  However, the reason we
> didn't make these public is because we ultimately need to deal with
> lvalues, which (a) are arguably not a good idea, and (b) we certainly
> can't do as a macro anyway.  Make sure you think about that.
> 
> Shriram
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