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Thu Aug 2 20:52:12 CEST 2007

weird macro bug

  ;; This driver could be generalized into eager evaluation for macros.

  (define-for-syntax (process-args op stx stx-args)
    (datum->syntax-object
     stx
     (map (lambda (x)
            (if (and (list? x)
                     (eq? ': (car x)))
                (op (cdr x))
                x))
          (syntax-object->datum stx-args))))

  ;; This utility macro calls another macro with an argument list
  ;; reversed if it is tagged with ':'. This is necessary for PN <->
  ;; RPN conversion.

  (define-syntax reverse-args
    (lambda (stx)
      (syntax-case stx ()
        ((_ m . args)
         #`(m . #,(process-args reverse stx #'args))))))



The code above doesn't work.. Something about the syntax gets lost
maybe? Expanding the macro seems to do the right thing though..




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