The R6RS Libraries 12.6 says of datum->syntax: "Template-id must be a
template identifier and datum should be a datum value."

That does say "should", not "must", but to be portable, only a datum
value should be used, right?  The syntax object
#'define-record-type-helper in the below makes the list not be a datum
value.  This prevents the reference implementation from working in PLT
Scheme and Ikarus.

          (datum->syntax
           #'tname
           `(,#'define-record-type-helper
             ,type-name ,fields ,parent
             ,(if constructor-args
                  (list constructor-name constructor-args)
                  constructor-name)
             ,predicate-name
             ,accessor-fields ,mutator-fields)))))))

(import
  (rnrs base)
  (err5rs records syntactic))
(define-record-type A #t #t a b)

PLT's error =>

zone/scheme/err5rs/records/syntactic.sls:119:10: datum->syntax:
expected argument of type <datum>; given
{#<syntax:/home/d/.plt-scheme/4.0.2.6/collects/err5rs/records/syntactic.sls:121:16> A #(a b) #f make-A A? {{A-a a} {A-b b}} ()}

--
: Derick
----------------------------------------------------------------