		Search-engine friendly clone of the ACL2 documentation.

States

Errorp

Check if the error flag in the state is set.

Signature
(errorp stat feat) → yes/no
Arguments: stat — Guard (statp stat).; feat — Guard (featp feat).
Returns: yes/no — Type (booleanp yes/no).

Definitions and Theorems

Function: errorp

(defun errorp (stat feat)
  (declare (xargs :guard (and (statp stat) (featp feat))))
  (declare (ignore feat))
  (declare (xargs :guard (stat-validp stat feat)))
  (let ((__function__ 'errorp))
    (declare (ignorable __function__))
    (stat->error stat)))

Theorem: booleanp-of-errorp

(defthm booleanp-of-errorp
  (b* ((yes/no (errorp stat feat)))
    (booleanp yes/no))
  :rule-classes :rewrite)

Theorem: errorp-of-stat-fix-stat

(defthm errorp-of-stat-fix-stat
  (equal (errorp (stat-fix stat) feat)
         (errorp stat feat)))

Theorem: errorp-stat-equiv-congruence-on-stat

(defthm errorp-stat-equiv-congruence-on-stat
  (implies (stat-equiv stat stat-equiv)
           (equal (errorp stat feat)
                  (errorp stat-equiv feat)))
  :rule-classes :congruence)

Theorem: errorp-of-feat-fix-feat

(defthm errorp-of-feat-fix-feat
  (equal (errorp stat (feat-fix feat))
         (errorp stat feat)))

Theorem: errorp-feat-equiv-congruence-on-feat

(defthm errorp-feat-equiv-congruence-on-feat
  (implies (feat-equiv feat feat-equiv)
           (equal (errorp stat feat)
                  (errorp stat feat-equiv)))
  :rule-classes :congruence)