doc question: @example inside @warning?

[Joe Neeman]

If you have a look at commit 06b6383aca113, you'll see a commented out
paragraph that looks like this:

@c FIXME: is it possible to have @example inside @warning?
@c @warning{ Adjacent non-staff lines should have non-increasing
@c @var{staff-affinity} from top-to-bottom.  For example, the behavior
of
@c @example
@c <<
@c   \new Staff c
@c   \new Lyrics \with @{ \override VerticalAxisGroup #'staff-affinity =
#DOWN @}
@c   \new Lyrics \with @{ \override VerticalAxisGroup #'staff-affinity =
#UP @}
@c   \new Staff c
@c >>
@c @end example
@c is undefined.
@c }

It's commented out because I couldn't get it to compile: pdfetex exited
with an error (although it still managed to produce a pdf). Is there
some other way I can achieve the same effect?

Cheers,
Joe