#lang scheme/base
(require 2htdp/universe ; "sb-universe.ss"
         htdp/error ; check-arg
         "tiles.ss"
         "io-stuff.ss")
(provide ; (all-from-out "sb-universe.ss")
         (all-from-out "tiles.ss")   ; includes all-from-out 2htdp/image, plus a few simple add-ons
         (all-from-out "io-stuff.ss")) ; includes with-{input-from,output-to}-{string,file}, with-io-strings
(provide show-it)
(provide (all-from-out 2htdp/universe))


(define (show-it img)
  (check-arg 'show-it (image? img) "image" "first" img)
  img)