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Exec-outcome

Exec-outcome-p

Recognizer for exec-outcome structures.

Signature
(exec-outcome-p x) → *

Definitions and Theorems

Function: exec-outcome-p

(defun exec-outcome-p (x)
       (declare (xargs :guard t))
       (let ((__function__ 'exec-outcome-p))
            (declare (ignorable __function__))
            (and (consp x)
                 (cond ((or (atom x) (eq (car x) :terminating))
                        (and (true-listp (cdr x))
                             (eql (len (cdr x)) 1)
                             (b* ((result (std::da-nth 0 (cdr x))))
                                 (valuep result))))
                       ((eq (car x) :error)
                        (and (true-listp (cdr x))
                             (eql (len (cdr x)) 0)
                             (b* nil t)))
                       (t (and (eq (car x) :nonterminating)
                               (and (true-listp (cdr x))
                                    (eql (len (cdr x)) 0))
                               (b* nil t)))))))

Theorem: consp-when-exec-outcome-p

(defthm consp-when-exec-outcome-p
        (implies (exec-outcome-p x) (consp x))
        :rule-classes :compound-recognizer)