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Repeat-range

Repeat-rangep

Recognizer for repeat-range structures.

Signature
(repeat-rangep x) → *

Definitions and Theorems

Function: repeat-rangep

(defun repeat-rangep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'repeat-rangep))
    (declare (ignorable __function__))
    (and (consp x)
         (eq (car x) :repeat)
         (true-listp (cdr x))
         (eql (len (cdr x)) 2)
         (b* ((min (std::da-nth 0 (cdr x)))
              (max (std::da-nth 1 (cdr x))))
           (and (natp min) (natip max))))))

Theorem: consp-when-repeat-rangep

(defthm consp-when-repeat-rangep
  (implies (repeat-rangep x) (consp x))
  :rule-classes :compound-recognizer)