Re: Problem with define-macro from compiled file (Guile 1.9)

[Hans Aberg <haberg-1@telia.com>]

On 6 Jan 2011, at 19:18, Patrick Bernaud wrote:

> I have a case where a macro is defined in a file that is then loaded
> by another which makes use of the macro. And it produces a 'wrong type
> to apply' error from the VM.
>
> (Works fine with GUILE_AUTO_COMPILE=0 and compiled files removed).
>
> For example, with the 'when' macro from the manual:
>
> -%<---- when.scm ----%<-
> (define-macro (when cond exp . rest)
> `(if ,cond
>      (begin ,exp . ,rest)))
> -%<---- when.scm ----%<-
>
> -%<---- test.scm ----%<-
> (load "when.scm")
> (when #t (display "Launching missiles!\n"))
> -%<---- test.scm ----%<-

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

(use-syntax (ice-9 syncase))

(define-syntax when
  (syntax-rules ()
    ((when cond x ...)
      (if cond (begin x ...)))
))

(when #t (display "Launching missiles!\n"))