+;;; closure
+
+(declaim (notinline true))
+(defun true (x)
+ (declare (ignore x))
+ t)
+
+(defun-with-dx dxclosure (x)
+ (flet ((f (y)
+ (+ y x)))
+ (declare (dynamic-extent #'f))
+ (true #'f)))
+
+(assert (eq t (dxclosure 13)))
+
+;;; value-cells
+
+(defun-with-dx dx-value-cell (x)
+ ;; Not implemented everywhere, yet.
+ #+(or x86 x86-64 mips)
+ (let ((cell x))
+ (declare (dynamic-extent cell))
+ (flet ((f ()
+ (incf cell)))
+ (declare (dynamic-extent #'f))
+ (true #'f))))
+
+;;; CONS
+
+(defun-with-dx cons-on-stack (x)
+ (let ((cons (cons x x)))
+ (declare (dynamic-extent cons))
+ (true cons)
+ nil))
+
+;;; with-spinlock should use DX and not cons
+
+(defvar *slock* (sb-thread::make-spinlock :name "slocklock"))
+
+(defun test-spinlock ()
+ (sb-thread::with-spinlock (*slock*)
+ (true *slock*)))
+
+;;; not really DX, but GETHASH and (SETF GETHASH) should not cons