Re: Percent repeats in lyrics causes error in 2.18.2

[Thomas Morley]

Am Mi., 8. Mai 2019 um 00:25 Uhr schrieb David Kastrup <address@hidden>:
>
> Thomas Morley <address@hidden> writes:

> > I tried a quick adhoc coding.
> >
> > Works with \unfoldRepeats, regrettable prints nothing without it.
> > I'd expect to see it at least one time printed without \unfoldRepeats.
> >
> > Anyway, here my coding so far, what do I miss?
>
> An iterator creator ?

I've exactly zero experience with this topic.

I tried to get some more info, we have:
http://lilypond.org/doc/v2.19/Documentation/contributor-big-page.html#iterator-tutorial

Which reads:
"
10.10 Iterator tutorial
TODO – this is a placeholder for a tutorial on iterators
Iterators are routines written in C++ that process music expressions
and sent the music events to the appropriate engravers and/or
performers.
See a short example discussing iterators and their duties in
Articulations on EventChord.
"
Not that enlightening... Admittedly there a some more hints spread over CG.
Though, right now I'm not even sure, if it's possible in scheme at all.

Is there any scheme-example?

Cheers,
  Harm