Re: Any ideas what is happening here?

[Dan Eble]

> On Nov 3, 2021, at 19:20, David Kastrup <dak@gnu.org> wrote:
> 
> Dan Eble <nine.fierce.ballads@gmail.com> writes:
> 
>> On Nov 3, 2021, at 18:40, David Kastrup <dak@gnu.org> wrote:
>>> 
>>> 
>>> My use case is something different entirely and it does not work as
>>> expected.  This may or may not be a relevant minimal example for my use
>>> case (no idea) but is weird enough to suggest something's off.
>>> 
>>> {
>>> \repeat volta 2
>>> {
>>>   c'1
>>>   \volta 1 \set Timing.baseMoment = #(ly:make-moment 1/4)
>>>   e'1
>>> }
>>> }
>> 
>> I have no time now, but I hope I can take a look in a few hours.
>> Maybe the iterator for \volta should be doing something different with
>> its context.  I very vaguely recall that the NR tells of a known issue
>> involving repeats and contexts.
> 
>          Note: If you include ‘\relative’ inside a ‘\repeat’ without
>          explicitly instantiating the ‘Voice’ context, extra (unwanted)
>          staves will appear.  See *note (lilypond-usage)An extra staff
>          appears::.
> 
> 
> Not really related as far as I can see.  There is no \relative here, and
> at the problematic moment, a Timing context most certainly exists and is
> visible, and the current context is already instantiated as a Voice
> context.  You can put \new Voice or \new Staff around the whole repeat
> or its body without change.

Using \tuplet 1/1 instead of \volta 1 causes the same problem.

Nesting the \set within <<>> or {} makes the problem go away.  Does that serve 
as a work-around in your use case?
— 
Dan