Prabhakar Ragde wrote at 08/09/2011 12:05 PM:
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
Someone other than me can do a better job of explaining, but I'll
quickly and gauchely link to my blog, for some things that were harder
in "syntax-rules" than they would've been in "syntax-case":
http://www.neilvandyke.org/weblog/2010/10/#2010-10-08
http://www.neilvandyke.org/weblog/2008/11/#2008-11-03
http://www.neilvandyke.org/weblog/2009/04/#2009-04-06
http://www.neilvandyke.org/weblog/2009/11/#2009-11-28
Then there are things that are possible in Racket's "syntax-case" but
impossible in RnRS "syntax-rules" (unless perhaps your name is Oleg).
My forthcoming "html-template" package, for example, is implemented
using "syntax-case", so that it can generate large strings of HTML at
expansion time instead of while you're trying to serve Web pages quickly.
--
http://www.neilvandyke.org/
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