-----
(define-syntax define-object
  (syntax-rules ()
    ((define-objects NAME FIELDS ...)
     (begin
       (define NAME
	 (make-gromit-object
	   'NAME
	   (let-syntax ((field->list
			  (syntax-rules ()
			    ((field->list (name type))
			     '(name type)))))
	     (vector (field->list FIELDS) ...))))))
    ))
-----

works but,

-----
(define-syntax define-object
  (syntax-rules ()
    ((define-objects NAME FIELDS ...)
     (begin
       (define NAME
	 (make-gromit-object
	   'NAME
	   (let-syntax ((field->list
			  (syntax-rules ()
			    ((field->list (name type flags ...))
			     '(name type flags ...)))))
	     (vector (field->list FIELDS) ...))))))
    ))
-----

gives

-----
Error: during expansion of (syntax-rules ...) - too many ellipses: (type ...)

        Call history:

        <syntax>          (define-syntax define-object (syntax-rules () ((define-objects NAME FIELDS ...) (begin (define NAME ...
        <syntax>          (##core#define-syntax define-object (syntax-rules () ((define-objects NAME FIELDS ...) (begin (defin......
        <syntax>          (syntax-rules () ((define-objects NAME FIELDS ...) (begin (define NAME (make-gromit-object (quote NA......    <--
-----