[racket] Macros and literal-id

From: Prabhakar Ragde (plragde at uwaterloo.ca)
Date: Tue Aug 9 12:05:47 EDT 2011

Neil Van Dyke wrote:

> The hardest macro tasks, in "syntax-rules",
> become opportunities to show off how well one can do scary-looking CPS
> that's really expensive at expansion time.

For my edification, as well as that of other macro newbies, can you give 
some examples of this, and how syntax-case can be more expressive? 
Thanks. --PR

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