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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)