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• Maybe-stat

Maybe-stat-fix

Fixing function for maybe-stat structures.

Signature

(maybe-stat-fix x) → new-x

Arguments

x — Guard (maybe-statp x).

Returns

new-x — Type (maybe-statp new-x).

Definitions and Theorems

Function: maybe-stat-fix$inline

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

Theorem: maybe-statp-of-maybe-stat-fix

(defthm maybe-statp-of-maybe-stat-fix
  (b* ((new-x (maybe-stat-fix$inline x)))
    (maybe-statp new-x))
  :rule-classes :rewrite)

Theorem: maybe-stat-fix-when-maybe-statp

(defthm maybe-stat-fix-when-maybe-statp
  (implies (maybe-statp x)
           (equal (maybe-stat-fix x) x)))

Function: maybe-stat-equiv$inline

(defun maybe-stat-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (maybe-statp acl2::x)
                              (maybe-statp acl2::y))))
  (equal (maybe-stat-fix acl2::x)
         (maybe-stat-fix acl2::y)))

Theorem: maybe-stat-equiv-is-an-equivalence

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

Theorem: maybe-stat-equiv-implies-equal-maybe-stat-fix-1

(defthm maybe-stat-equiv-implies-equal-maybe-stat-fix-1
  (implies (maybe-stat-equiv acl2::x x-equiv)
           (equal (maybe-stat-fix acl2::x)
                  (maybe-stat-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: maybe-stat-fix-under-maybe-stat-equiv

(defthm maybe-stat-fix-under-maybe-stat-equiv
  (maybe-stat-equiv (maybe-stat-fix acl2::x)
                    acl2::x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-maybe-stat-fix-1-forward-to-maybe-stat-equiv

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

Theorem: equal-of-maybe-stat-fix-2-forward-to-maybe-stat-equiv

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

Theorem: maybe-stat-equiv-of-maybe-stat-fix-1-forward

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

Theorem: maybe-stat-equiv-of-maybe-stat-fix-2-forward

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