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Fun-spec

Fun-specp

Recognizer for fun-spec structures.

Signature
(fun-specp x) → *

Definitions and Theorems

Function: fun-specp

(defun fun-specp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'fun-specp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :inline))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((uscores (std::da-nth 0 (cdr x))))
                       (keyword-uscores-p uscores))))
               (t (and (eq (car x) :noreturn)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-fun-specp

(defthm consp-when-fun-specp
  (implies (fun-specp x) (consp x))
  :rule-classes :compound-recognizer)