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Stray Birds

I haven't used the HL macros, but what is wrong with the following
(besides "exporting" define-values-helper) as a _reference_
implementation

(define-syntax DEFINE-VALUES
  (syntax-rules
   ()
   ((define-values (<name> ...) <body> ...)
    (begin
      (define <name> #f) ...
      (call-with-values
       (lambda () <body> ...)
       (lambda all-the-values
	 (define-values-helper all-the-values <name> ...)))))))

(define-syntax DEFINE-VALUES-HELPER
  (syntax-rules
   ()
   ((define-values-helper accum)
    #f)
   ((define-values-helper accum <name1> <name2> ...)
    (begin
      (set! <name1> (car accum))
      (define-values-helper (cdr accum) <name2> ...)))))