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• Token+span

Token+span-p

Recognizer for token+span structures.

Signature

(token+span-p x) → *

Definitions and Theorems

Function: token+span-p

(defun token+span-p (x)
  (declare (xargs :guard t))
  (and (consp x)
       (b* ((token (car x)) (span (cdr x)))
         (and (tokenp token) (spanp span)))))

Theorem: consp-when-token+span-p

(defthm consp-when-token+span-p
  (implies (token+span-p x) (consp x))
  :rule-classes :compound-recognizer)