; 
; Welcome to Racket v7.8.
; 
> (define (selfsame? x)
    (eq? x selfsame?))
> (selfsame? 5)
#f
> (selfsame? selfsame?)
#t
> 

;; define by @cwebber@octodon.social
;; https://octodon.social/@cwebber/105629635767937024