Recognize true lists of command landmarks.
(pseudo-command-landmark-listp x) → std::bool
See
Function:
(defun pseudo-command-landmark-listp (x) (declare (xargs :guard t)) (let ((__function__ 'pseudo-command-landmark-listp)) (declare (ignorable __function__)) (if (consp x) (and (pseudo-command-landmarkp (car x)) (pseudo-command-landmark-listp (cdr x))) (null x))))