move Full Measure Rest up

[Orm Finnendahl]

Hi,

 the example in the previous mail was inconsistent with the mail text,
so here again:

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 des''4 c''4 }
>>
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