		Search-engine friendly clone of the ACL2 documentation.

Expression-option

Expression-option-fix

Fixing function for expression-option structures.

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

Definitions and Theorems

Function: expression-option-fix$inline

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

Theorem: expression-optionp-of-expression-option-fix

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

Theorem: expression-option-fix-when-expression-optionp

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

Function: expression-option-equiv$inline

(defun expression-option-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (expression-optionp acl2::x)
                              (expression-optionp acl2::y))))
  (equal (expression-option-fix acl2::x)
         (expression-option-fix acl2::y)))

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

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

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

(defthm
      expression-option-equiv-implies-equal-expression-option-fix-1
  (implies (expression-option-equiv acl2::x x-equiv)
           (equal (expression-option-fix acl2::x)
                  (expression-option-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: expression-option-fix-under-expression-option-equiv

(defthm expression-option-fix-under-expression-option-equiv
  (expression-option-equiv (expression-option-fix acl2::x)
                           acl2::x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

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

(defthm
 equal-of-expression-option-fix-1-forward-to-expression-option-equiv
 (implies (equal (expression-option-fix acl2::x)
                 acl2::y)
          (expression-option-equiv acl2::x acl2::y))
 :rule-classes :forward-chaining)

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

(defthm
 equal-of-expression-option-fix-2-forward-to-expression-option-equiv
 (implies (equal acl2::x (expression-option-fix acl2::y))
          (expression-option-equiv acl2::x acl2::y))
 :rule-classes :forward-chaining)

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

(defthm expression-option-equiv-of-expression-option-fix-1-forward
  (implies (expression-option-equiv (expression-option-fix acl2::x)
                                    acl2::y)
           (expression-option-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)

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

(defthm expression-option-equiv-of-expression-option-fix-2-forward
 (implies
   (expression-option-equiv acl2::x (expression-option-fix acl2::y))
   (expression-option-equiv acl2::x acl2::y))
 :rule-classes :forward-chaining)