I would write the latter as

#lang racket
(require racket/struct)
(define (copy-prefab s)
  (apply make-prefab-struct (prefab-struct-key s)
         (struct->list s)))

Sam

On Thu, Dec 7, 2017 at 11:53 AM, David Vanderson
<david.vander...@gmail.com> wrote:
> I would appreciate any advice on the best way to copy a prefab struct that
> could be a sub-struct.  I have been using write/read but felt bad about it.
> Trying again now gave me a new option. Is there a better solution out there?
>
> (define (copy-writable s)
>   (read (open-input-string (with-output-to-string (lambda () (write s))))))
>
> (define (copy-prefab s)
>   (call-with-values (lambda () (vector->values (struct->vector s) 1))
>                     (lambda args (apply make-prefab-struct
> (prefab-struct-key s) args))))
>
> Thanks,
> Dave
>
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