53 lines
1.1 KiB
Scheme
53 lines
1.1 KiB
Scheme
; Copyright (c) 1993-1999 by Richard Kelsey and Jonathan Rees. See file COPYING.
|
|
|
|
|
|
"
|
|
The correct output looks something like this:
|
|
|
|
wind-1 f: 1
|
|
wind-2 f: 2
|
|
before-throw-out f: 3
|
|
unwind-2 f: 2
|
|
unwind-1 f: 1
|
|
after-throw-out f: top
|
|
wind-1 f: 1
|
|
wind-2 f: 2
|
|
after-throw-in f: 3
|
|
unwind-2 f: 2
|
|
unwind-1 f: 1
|
|
done f: top
|
|
"
|
|
|
|
(define (wind-test)
|
|
(let* ((f (make-fluid 'top))
|
|
(report (lambda (foo)
|
|
(write foo)
|
|
(display " f: ")
|
|
(write (fluid f))
|
|
(newline))))
|
|
((call-with-current-continuation
|
|
(lambda (k1)
|
|
(let-fluid f 1
|
|
(lambda ()
|
|
(dynamic-wind
|
|
(lambda () (report 'wind-1))
|
|
(lambda ()
|
|
(let-fluid f 2
|
|
(lambda ()
|
|
(dynamic-wind
|
|
(lambda () (report 'wind-2))
|
|
(lambda ()
|
|
(let-fluid f 3
|
|
(lambda ()
|
|
(report 'before-throw-out)
|
|
(call-with-current-continuation
|
|
(lambda (k2)
|
|
(k1 (lambda ()
|
|
(report 'after-throw-out)
|
|
(k2 #f)))))
|
|
(report 'after-throw-in)
|
|
(lambda () (report 'done)))))
|
|
(lambda () (report 'unwind-2))))))
|
|
(lambda () (report 'unwind-1))))))))))
|
|
|