svn: r18006
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#lang scheme/gui
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(require 2htdp/universe)
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(require 2htdp/image)
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(define s "")
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(define x 1)
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(big-bang 1
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(on-tick (lambda (w)
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(begin
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(set! x (+ x 1))
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(if (= x 3) 0 1))))
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(stop-when zero?)
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(on-draw (lambda (w)
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(begin
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(set! s (string-append "-" s))
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(rectangle 1 1 'solid 'green)))))
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(unless (string=? s "---") (error 'world-update-test "failed! ~s" s))
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