anchor.diff:                (lambda ,(mapcar #'first bindings)
                   ,@body)))))
   
  -(defconstant +chunk-size+ 128)
  +(defconstant +chunk-size+ 1024)
   
   (defstruct (parallel:stream
               (:constructor %make-stream))
  
positive.code:              (prog1 stream
                 (setf (stream-index stream) index))
               (setf (stream-%next stream)
                     (future-value (stream-next stream)))))))
  
  (defun parallel:tail-prefetch (stream)
    (when (and (stream-p stream)
  
negative.code:                            value (values-list values))))
                  (t
                   (return (values)))))
        (parallel:future-value future))))
  
  (defmacro parallel:bind ((&rest bindings)
                           &body body)
  