		Search-engine friendly clone of the ACL2 documentation.

Function-denv-option

Function-denv-optionp

Recognizer for function-denv-option structures.

Signature
(function-denv-optionp x) → *

Definitions and Theorems

Function: function-denv-optionp

(defun function-denv-optionp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'function-denv-optionp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :some))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((get (std::da-nth 0 (cdr x))))
                       (function-denvp get))))
               (t (and (eq (car x) :none)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-function-denv-optionp

(defthm consp-when-function-denv-optionp
  (implies (function-denv-optionp x)
           (consp x))
  :rule-classes :compound-recognizer)