anchor.diff:  
   (defvar *current-cols*)
   (defvar *current-lines*)
  +
  +(defvar *window-sufficient-width* 150)
   
   (defvar *modeline-default-format*
     (list 'modeline-read-only-p
  
positive.code: (in-package :lem)
  
  (export '(*modeline-default-format*
            window-list
            window
            window-nlines
  
negative.code:           set-window-delete-hook
            recenter
            redraw-screen
            split-window-vertically
            split-window-horizontally
            split-window
            get-next-window
            other-window
  