[racket] Null value in macros

On Mon, Sep 23, 2013 at 11:59 AM, Matthias Felleisen
<matthias at ccs.neu.edu> wrote:
>
>      (define field-name (append-id stx "-" #'f))
>      (define set-name (append-id stx #'f "-set!"))

It gets even shorter when you write this as:

(define field-name (format-id stx "-~a" #'f))
(define set-name   (format-id stx "~a-set!" #'f))

using `format-id` from `racket/syntax`.

Sam