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Identifiers

Umidentifierp

Recognizer for umidentifier.

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

Definitions and Theorems

Function: umidentifierp

(defun umidentifierp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'umidentifierp))
    (declare (ignorable __function__))
    (and (identifierp x)
         (not (equal x (string=>unicode "yield"))))))

Theorem: booleanp-of-umidentifierp

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