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emended.
author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 13:10:57 +0900
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gosh> (define (cont-test i)
  (print "before")
  (call/cc (lambda (k) (set! cont k)))
  (print "after")
  (set! i (+ 1 i))
  i)
cont-test
gosh> (cont-test 10)
before
after
11
gosh> (cont)
after
12
gosh> (cont)
after
13
gosh> (cont-test 2222)
before
after
2223
gosh> (cont)
after
2224