Predicate of define-syntax

[Hans Aberg]

On 8 Jan 2011, at 00:22, Andreas Rottmann wrote:

If you are writing your own macro, I find 'define-syntax' easier:

It's not only easier, it also not inherently broken (as `define-macro'
is).  See <http://en.wikipedia.org/wiki/Hygienic_macro> for a  
discussion
of the hygiene issue.

It seems that one cannot check that it is a macro, though. For some  
reason, they do not self-evaluate.


(macro? cond)
  ~> #t


(define-syntax def
  (syntax-rules ()
    ((def x ...)
      (define x ...))
))

(macro? def)
  ~> error