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Dec-expo-prefix

Dec-expo-prefix-kind

Get the kind (tag) of a dec-expo-prefix structure.

Signature
(dec-expo-prefix-kind x) → kind
Arguments: x — Guard (dec-expo-prefixp x).

Definitions and Theorems

Function: dec-expo-prefix-kind$inline

(defun dec-expo-prefix-kind$inline (x)
  (declare (xargs :guard (dec-expo-prefixp x)))
  (let ((__function__ 'dec-expo-prefix-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :locase-e))
                       :locase-e)
                      (t :upcase-e))
         :exec (car x))))

Theorem: dec-expo-prefix-kind-possibilities

(defthm dec-expo-prefix-kind-possibilities
  (or (equal (dec-expo-prefix-kind x)
             :locase-e)
      (equal (dec-expo-prefix-kind x)
             :upcase-e))
  :rule-classes
  ((:forward-chaining :trigger-terms ((dec-expo-prefix-kind x)))))