(variable-listp x) recognizes lists where every element satisfies variablep.
(variable-listp x) → std::bool
This is an ordinary std::deflist. It is
"loose" in that it does not care whether
Function:
(defun variable-listp (x) (declare (xargs :guard t)) (let ((__function__ 'variable-listp)) (declare (ignorable __function__)) (if (consp x) (and (variablep (car x)) (variable-listp (cdr x))) t)))