Re: [Jscheme-user] macros

[Ken A. <kan...@bb...>]

The problem is that while loadking psyntax-init.scm changes (eval) and (load), the old (eval) and (load) is being used by jscheme.REPL.  I fixed this once, but it got broken when dynamic enviroments were added.

I'll try fixinig it again.  

For now, you can either put the macro definition in a file and load it, or use

(eval '(define-syntax swap ...))
(eval '(swap x y))

BTW, you can see the macroexpansion using sc-expand.

k

At 10:58 AM 3/22/2004 -0500, Borislav Iordanov wrote:
>Hi all,
>
>I have a problem getting macros to work. As I understand, I need to load
>the following two files:
>
>elf/eopl2/jscheme/genwrite.scm
>elf/eopl2/jscheme/psyntax-init.scm
>
>I do that and then try something simple like:
>
>(define-syntax swap
>  (syntax-rules ()
>        ((swap a b) (let ((tmp b)) (set! b a) (set! a tmp)))))
>
>Evaluating the last expression tells me "undefined variable
>'define-syntax'". 
>
>I also tried loading a the OO style code using/friedman-init.scm which
>makes heavy use of macros and I get an error saying that 'pretty-print'
>is not defined.
>
>This is with the latest code from CVS, patched not to set the current
>thread's classloader to Import.CLASSLOADER.
>
>I am quite a beginner in Scheme and I've never used macros, so the
>problem may be a really straightforward misunderstanding on my part.
>
>Thanks,
>Boris
>
>
>
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