		Search-engine friendly clone of the ACL2 documentation.

String-element

String-element-kind

Get the kind (tag) of a string-element structure.

Signature
(string-element-kind x) → kind
Arguments: x — Guard (string-elementp x).

Definitions and Theorems

Function: string-element-kind$inline

(defun string-element-kind$inline (x)
  (declare (xargs :guard (string-elementp x)))
  (let ((__function__ 'string-element-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :char)) :char)
                      (t :escape))
         :exec (car x))))

Theorem: string-element-kind-possibilities

(defthm string-element-kind-possibilities
  (or (equal (string-element-kind x) :char)
      (equal (string-element-kind x) :escape))
  :rule-classes
  ((:forward-chaining :trigger-terms ((string-element-kind x)))))