Re: warning: forced break was overridden by some other event, should you be using bar checks?

[Kenneth Wolcott]

HI Carl;

  There are many pieces of music in the Baroque, Classic and Romantic
periods where the same block of music is repeated without an
alternative.

  This particular example is a simplified version/arrangement of a Chopin Waltz.

  The problem goes away when I disabled the forced line breaks, so I
do think that there is a problem here, although it is an annoyance,
not severe.

  There is no problem with the bar checks after I disable the forced
line breaks.

Thanks,
Ken

On Wed, Jan 12, 2022 at 2:32 PM Carl Sorensen <c_sorensen@byu.edu> wrote:
>
>
>
> On 1/12/22, 3:24 PM, "lilypond-user on behalf of Kenneth Wolcott" 
> <lilypond-user-bounces+carl.d.sorensen=gmail.com@gnu.org on behalf of 
> kennethwolcott@gmail.com> wrote:
>
>     Yes, disabling line breaks removes the warning.  BTW, repeat volta 0
>     is in use; is that relevant?
>
> Why would one use \repeat volta 0?  It seems to make no sense to repeat a 
> chunk of music 0 times.
>
>
>     Thanks again,
>     Ken
>
>     On Wed, Jan 12, 2022 at 2:20 PM Kenneth Wolcott
>     <kennethwolcott@gmail.com> wrote:
>     >
>     > Hi;
>     >
>     >   Is there a bug in the Lilypond parser regarding bar checks?
>     >
> This isn't a parsing problem, it's an interpretation problem  It shows up 
> after parsing is completed.
>
> It is somewhere between bars 32 and 40.
>
> It will be somewhere where you have a /break command.
>
> You are trying to break a line where there is music on either side of a break 
> (e.g. one voice has c1, the other voice has a2 \break a2.)
>
> Bar checks will catch this because you will have some place you think you are 
> at the end of a bar (and that's where you put the \break), but you aren't 
> actually at the end of a bar; you're in the middle of a measure with one or 
> the other voice).
>
> HTH,
>
> Carl
>
>
>     >   It would be nice if Lilypond would let me know more specifically
>     > where this warning occurred, shouldn't it know?
>     >
>     >   I don't see the error in my engraving that would cause this and I'm
>     > having trouble using the 8/16/24/32 to determine where the problem is.
>     >
>     >   Yes, I know I should do a block comment (determine location by use
>     > of bisection), but, still, why can't Lilypond tell me which line in
>     > the source is problematic?
>     >
>     > Thanks,
>     > Ken Wolcott
>     >
>     > GNU LilyPond 2.22.1
>     > Processing `Walzer.ly'
>     > Parsing...
>     > Interpreting music...[8][16][24][32]
>     > warning: forced break was overridden by some other event, should you
>     > be using bar checks?
>     > [40][48][56]
>     > Preprocessing graphical objects...
>     > Interpreting music...
>     > MIDI output to `Walzer.midi'...
>     > Finding the ideal number of pages...
>     > Fitting music on 1 or 2 pages...
>     > Drawing systems...
>     > Converting to `Walzer.pdf'...
>     > Success: compilation successfully completed
>
>
>