		Search-engine friendly clone of the ACL2 documentation.

State-stobj

Errorp1{0}

Refine errorp to use the stobj states.

Definitions and Theorems

Function: errorp1{0}

(defun errorp1{0} (stat feat)
 (declare (xargs :non-executable t))
 (declare
    (xargs :guard (non-exec (and (stat1p stat)
                                 (statp (stat-from-stat1 stat))
                                 (featp feat)
                                 (stat-validp (stat-from-stat1 stat)
                                              feat)))))
 (prog2$ (acl2::throw-nonexec-error 'errorp1{0}
                                    (list stat feat))
         (if (acl2::mbt$ (stat1p stat))
             (stat->error (stat-from-stat1 stat))
           0)))

Theorem: errorp1{0}-to-errorp

(defthm errorp1{0}-to-errorp
  (implies (stat1p stat)
           (equal (errorp1{0} stat feat)
                  (errorp (stat-from-stat1 stat) feat)))
  :rule-classes :rewrite)

Theorem: errorp-to-errorp1{0}

(defthm errorp-to-errorp1{0}
  (implies (statp stat)
           (equal (errorp stat feat)
                  (errorp1{0} (stat1-from-stat stat)
                              feat)))
  :rule-classes :rewrite)