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(in-package :extreload)
(defclass call-id ()
((id
:initform 0
:reader id
:documentation "Current call ID."))
(:documentation "An incrementing identifier."))
(defgeneric next-call-id (call-id)
(:documentation "Increment the call ID and return the result."))
(defmethod next-call-id ((call-id call-id))
(incf (slot-value call-id 'id)))
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