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Identifiers

Identifierp

Recognizer for identifier.

Signature
(identifierp x) → yes/no
Returns: yes/no — Type (booleanp yes/no).

Definitions and Theorems

Function: identifierp

(defun identifierp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'identifierp))
    (declare (ignorable __function__))
    (and (unicode-listp x)
         (consp x)
         (identifier-start-p (car x))
         (identifier-part-listp (cdr x))
         (not (jkeywordp x))
         (not (boolean-literalp x))
         (not (null-literalp x)))))

Theorem: booleanp-of-identifierp

(defthm booleanp-of-identifierp
  (b* ((yes/no (identifierp x)))
    (booleanp yes/no))
  :rule-classes :rewrite)