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Struct-denv-option

Struct-denv-optionp

Recognizer for struct-denv-option structures.

Signature
(struct-denv-optionp x) → *

Definitions and Theorems

Function: struct-denv-optionp

(defun struct-denv-optionp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'struct-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))))
                       (struct-denvp get))))
               (t (and (eq (car x) :none)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-struct-denv-optionp

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