Issue 1930 in lilypond: convert-ly: No rule for MMRs 'staff-position = #0

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Ugly

New issue 1930 by brownian.box: convert-ly: No rule for  
MMRs 'staff-position = #0
http://code.google.com/p/lilypond/issues/detail?id=1930

Since #'staff-position = #0 does not place MMR to "default position",  
convert-ly should at least warn on this:

%----------------8<-------------------
\version "2.12.3"

{
  \override MultiMeasureRest #'staff-position = #0
  R1
}
%----------------8<-------------------

Please, how _critical_ it is?