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• Token-option

Token-optionp

Recognizer for token-option structures.

Signature

(token-optionp x) → *

Definitions and Theorems

Function: token-optionp

(defun token-optionp (x)
  (declare (xargs :guard t))
  (cond ((not x) (b* nil t))
        (t (b* ((fty::val x)) (tokenp fty::val)))))