[plt-scheme] A question on "expand"

The latest version of DrScheme gives you much better feedback about
syntax objects. In the REPL, they have a little turn down knobby that,
when turned, shows you all kinds of information about them.

If you can't get to the CVS archive, you might instead use
syntax-object->datum -- it produces an sexp version of the syntax
object.

One comment about your code: you need to quote the argument to expand
-- it is a function from syntax (or sexp) to syntax. 

Robby

At Tue, 12 Nov 2002 16:18:53 +1100, Chris Wright wrote:
>   For list-related administrative tasks:
>   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> 
> I'm currently in the middle of getting macros all wrong;)
> So, I'm trying to "see what they look like" by using "expand"
> 
>   (define-macro t
>      (lambda (args)
>        `(apply + ,args)))
> 
> 
> (useless --- I know)
> 
>  > (t ' (1 2))
> 3
> 
> (Yipee!)
> 
> but I want to see the expansion:
> 
>  > (expand (t '(1 2)))
> #<syntax>
>   (expand-to-top-form (t '(1 2)))
> #<syntax>
> 
> Terrific :(
> 
> How do I "see" the expansion?
> 
> 
> thanks
> 
> 
> Chris
> 
> Dr Chris Wright
> Medical Director, ICU
> Monash Medical Centre
> Clayton VIC 3168