		Search-engine friendly clone of the ACL2 documentation.

Reserr-option

Reserr-option-fix

Fixing function for reserr-option structures.

Signature
(reserr-option-fix x) → new-x
Arguments: x — Guard (reserr-optionp x).
Returns: new-x — Type (reserr-optionp new-x).

Definitions and Theorems

Function: reserr-option-fix$inline

(defun reserr-option-fix$inline (x)
  (declare (xargs :guard (reserr-optionp x)))
  (let ((__function__ 'reserr-option-fix))
    (declare (ignorable __function__))
    (mbe :logic (cond ((not x) nil)
                      (t (b* ((val (reserr-fix x))) val)))
         :exec x)))

Theorem: reserr-optionp-of-reserr-option-fix

(defthm reserr-optionp-of-reserr-option-fix
  (b* ((new-x (reserr-option-fix$inline x)))
    (reserr-optionp new-x))
  :rule-classes :rewrite)

Theorem: reserr-option-fix-when-reserr-optionp

(defthm reserr-option-fix-when-reserr-optionp
  (implies (reserr-optionp x)
           (equal (reserr-option-fix x) x)))

Function: reserr-option-equiv$inline

(defun reserr-option-equiv$inline (x y)
  (declare (xargs :guard (and (reserr-optionp x)
                              (reserr-optionp y))))
  (equal (reserr-option-fix x)
         (reserr-option-fix y)))

Theorem: reserr-option-equiv-is-an-equivalence

(defthm reserr-option-equiv-is-an-equivalence
  (and (booleanp (reserr-option-equiv x y))
       (reserr-option-equiv x x)
       (implies (reserr-option-equiv x y)
                (reserr-option-equiv y x))
       (implies (and (reserr-option-equiv x y)
                     (reserr-option-equiv y z))
                (reserr-option-equiv x z)))
  :rule-classes (:equivalence))

Theorem: reserr-option-equiv-implies-equal-reserr-option-fix-1

(defthm reserr-option-equiv-implies-equal-reserr-option-fix-1
  (implies (reserr-option-equiv x x-equiv)
           (equal (reserr-option-fix x)
                  (reserr-option-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: reserr-option-fix-under-reserr-option-equiv

(defthm reserr-option-fix-under-reserr-option-equiv
  (reserr-option-equiv (reserr-option-fix x)
                       x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-reserr-option-fix-1-forward-to-reserr-option-equiv

(defthm equal-of-reserr-option-fix-1-forward-to-reserr-option-equiv
  (implies (equal (reserr-option-fix x) y)
           (reserr-option-equiv x y))
  :rule-classes :forward-chaining)

Theorem: equal-of-reserr-option-fix-2-forward-to-reserr-option-equiv

(defthm equal-of-reserr-option-fix-2-forward-to-reserr-option-equiv
  (implies (equal x (reserr-option-fix y))
           (reserr-option-equiv x y))
  :rule-classes :forward-chaining)

Theorem: reserr-option-equiv-of-reserr-option-fix-1-forward

(defthm reserr-option-equiv-of-reserr-option-fix-1-forward
  (implies (reserr-option-equiv (reserr-option-fix x)
                                y)
           (reserr-option-equiv x y))
  :rule-classes :forward-chaining)

Theorem: reserr-option-equiv-of-reserr-option-fix-2-forward

(defthm reserr-option-equiv-of-reserr-option-fix-2-forward
  (implies (reserr-option-equiv x (reserr-option-fix y))
           (reserr-option-equiv x y))
  :rule-classes :forward-chaining)