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Schar-array

Schar-arrayp

Recognizer for schar-array structures.

Signature
(schar-arrayp x) → *

Definitions and Theorems

Function: schar-arrayp

(defun schar-arrayp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'schar-arrayp))
    (declare (ignorable __function__))
    (and (consp x)
         (eq (car x) :array)
         (true-listp (cdr x))
         (eql (len (cdr x)) 2)
         (b* ((elemtype (std::da-nth 0 (cdr x)))
              (elements (std::da-nth 1 (cdr x))))
           (and (typep elemtype)
                (schar-listp elements)
                (type-case elemtype :schar)
                (consp elements))))))

Theorem: consp-when-schar-arrayp

(defthm consp-when-schar-arrayp
  (implies (schar-arrayp x) (consp x))
  :rule-classes :compound-recognizer)