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Transunit

Transunitp

Recognizer for transunit structures.

Signature
(transunitp x) → *

Definitions and Theorems

Function: transunitp

(defun transunitp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'transunitp))
    (declare (ignorable __function__))
    (and (mbe :logic (and (alistp x)
                          (equal (strip-cars x) '(decls)))
              :exec (fty::alist-with-carsp x '(decls)))
         (b* ((decls (cdr (std::da-nth 0 x))))
           (extdecl-listp decls)))))

Theorem: consp-when-transunitp

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