move Full Measure Rest up

[Orm Finnendahl]

Hi,

 in the following snippet the whole measure rest in the upper voice
collides with the des in the lower voice an needs to be moved up:

8<-----------------------------------------------------------
\version "2.19"

<<
 { R1 }
   \\  
 { aes'2 bes'4 c''4 | %40
      bes'4 des'4 ges'4 f'4 | %41
 }
>>
8<-----------------------------------------------------------

Using a note name with \rest will place the rest on the first
beat. Is there a way to move the rest up but keep it centered in the
measure?

--
Orm