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(define-condition generated () | |
((item :initarg :item :reader generated-item))) | |
(defun yield (&optional item) | |
(restart-case (signal 'generated :item item) | |
(resume (&optional item) item))) | |
(defun send (item generator) | |
(let (already-triggered) | |
(handler-bind ((generated (lambda (e) |