Subject: Re: Questions... I am new to scheme
From: rpw3@rigden.engr.sgi.com (Rob Warnock)
Date: 1998/12/04
Newsgroups: comp.lang.scheme
Message-ID: <747fhr$382i@fido.engr.sgi.com>
Ben Goetter <goetter@angrygraycat.com.xyz> wrote:
+---------------
| You've spoofed the very simple SIOD evaluator.  If the SIOD evaluator 
| finds a symbol, it will evaluate that symbol, then recur.
| 
| > (set! c 'hi)
| > (c) => ERROR: unbound variable (errobj hi)
| 
| SIOD's trying to evaluate the symbol you gave it as a procedure.  Looks 
| up C, gets the symbol Hi; looks up Hi with no joy.
+---------------

Actually, in SIOD this is considered a "feature", not a "bug", ;-}  ;-}
and is the macro mechanism in SIOD [transcript edited some]:

	> (define (mq-expander form)
	    (puts  "DEBUG: mq-expander: form = ")
	    (print form)
	    (cons 'quote (cdr form)))
	> (define my-quote 'mq-expander)
	mq-expander
	> (my-quote 5)
	DEBUG: mq-expander: form = (my-quote 5)
	5
	> (my-quote (this that (the other) thing))
	DEBUG: mq-expander: form = (my-quote (this that (the other) thing))
	(this that (the other) thing)
	> 


-Rob

-----
Rob Warnock, 8L-855		rpw3@sgi.com
Applied Networking		http://reality.sgi.com/rpw3/
Silicon Graphics, Inc.		Phone: 650-933-1673
2011 N. Shoreline Blvd.		FAX: 650-964-0811
Mountain View, CA  94043	PP-ASEL-IA