REPL with return

return.rkt

#lang racket

(define-namespace-anchor this-module)
(displayln 'start)
(displayln `(repl ,(call/ec (λ (return-k)
                              (parameterize ([current-namespace (namespace-anchor->namespace this-module)])
                                (namespace-set-variable-value! 'return return-k #f (current-namespace) #t)
                                (read-eval-print-loop))))))
(displayln 'end)

A possible variant could set exit-handler (https://docs.racket-lang.org/reference/Exiting.html#%28def._%28%28quote._~23~25kernel%29._exit-handler%29%29)