Re: v2.15.24: void-, scheme- or music-function in toc-section?

[Jan-Peter Voigt]

Hi Thomas,
> BTW: I thought the 2.15.24-define-music-function not always needs to
> return music.
>
> http://lilypond.org/doc/v2.15/Documentation/changes-big-page.html
>
> "The construct #{ … #} can now be used not just for constructing
> sequential music lists, but also for single music events, void music
> expressions, post events, markups (mostly freeing users from having to
> use the markup macro), markup lists, number expressions, context
> definitions and modifications, and a few other things. If it encloses
> nothing or only a single music event, it no longer returns a
> sequential music list but rather a void music expression or just the
> music event itself, respectively."
>
> Did I misunderstood (because of my insufficient english-skills)?
I don't know ;-)?
When you have

#{
\tocItemA $text
\tocItemB $text
#}

every toc-command returns an EventChord marked with a page-label. So the 
#{-#}-construct already contains a list of music-events and leads to 
'SequentialMusic.
How #{#} is used to produce something else, I didn't understand yet. It 
is a quite new feature that I've heard of, but I didn't use it.

HTH
Cheers,
Jan-Peter