Hi Kenneth, hi all, Lilypond is both a program and a music language. So we have two versions, the program version and the language version. Using a lower program version on a higher language version does issue a warning and will potentially fail. Using a higher program version on a lower language version will not issue a warning, but still potentially fail. I do think that even in this case Lilypond should issue a warning.
The silent implication here is that the language is only extended, but never changed. Thus if the language version is more recent than the program it might be that it uses a feature that the program does not have at this point, but if the language version is older than the program version it is assumed that the program can handle the old language version. This is of course totally not true: We often see renaming of functions and Grobs, changes in behaviour of e.g. some engravers which also occasionally means that the language has to change and such. I think in stable it is reasonable to assume that the language does not change much due to minor updates. On devel the language is expected to change, and between major versions I think we should expect the possibility of incompatibility. Cheers, Valentin Am Samstag, 18. Februar 2023, 09:02:39 CET schrieb Kenneth Wolcott: > I have some LIlypond code (from someone on the list) which is at > Lilypond version: > > grep version ./only_even_bars.ly > \version "2.22.0" > > ~/Downloads/lilypond-2.24.1/bin/lilypond ./only_even_bars.ly > GNU LilyPond 2.24.1 (running Guile 2.2) > Processing `./only_even_bars.ly' > Parsing... > Interpreting music...[8] > Preprocessing graphical objects... > Finding the ideal number of pages... > Fitting music on 1 page... > Drawing systems... > Converting to `only_even_bars.pdf'... > Success: compilation successfully completed > > No big fat warning. > > ~/Downloads/lilypond-2.24.1/bin/lilypond --version > GNU LilyPond 2.24.1 (running Guile 2.2) > > The resultant pdf is at Lilypond version 2.24.1 (attached). > > Hmmm... > > Ken > > On Fri, Feb 17, 2023 at 11:52 PM Werner LEMBERG <w...@gnu.org> wrote: > > > Well, that’s what you get if the LilyPond version is too old. The > > > question was for a version that is “too new”. > > > > D'oh, right :-) > > > > Werner
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