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Dimb-kind

Dimb-kindp

Recognizer for dimb-kind structures.

Signature
(dimb-kindp x) → *

Definitions and Theorems

Function: dimb-kindp

(defun dimb-kindp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'dimb-kindp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :typedef))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               ((eq (car x) :objfun)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               (t (and (eq (car x) :enumconst)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-dimb-kindp

(defthm consp-when-dimb-kindp
  (implies (dimb-kindp x) (consp x))
  :rule-classes :compound-recognizer)