\version "2.12.0"
\header {
texidoc = "Whole and half rests moving outside the staff should get
ledger lines."
}


\paper { ragged-right = ##t } 

{
   \override Rest  #'staff-position = #4
  r1 \override Rest  #'staff-position = #5
  r1 \override Rest  #'staff-position = #6
  
  r1 \override Rest  #'staff-position = #-6
  r1 \override Rest  #'staff-position = #-7
  r1 \override Rest  #'staff-position = #-8
  r1

   \override Rest  #'staff-position = #6
  r2 \override Rest  #'staff-position = #7
  r2 \override Rest  #'staff-position = #8
  
  r2 \override Rest  #'staff-position = #-4
  r2 \override Rest  #'staff-position = #-5
  r2 \override Rest  #'staff-position = #-6
  r2

}