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Delimited control example
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| (run-cc | |
| ($lambda () | |
| ($let ((p (make-prompt))) | |
| (+ 2 ($push-prompt p | |
| ($if (with-sub-cont p | |
| ($lambda (k) | |
| (+ ($push-sub-cont k #f) | |
| ($push-sub-cont k #t)))) | |
| 3 | |
| 4)))))) | |
| ;; ==> 9 |
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