Thank you for the answers! I'm happy this helped pinpoint a problem, and as a bonus I ended up learning about @@.
El mié., 1 may. 2019 a las 14:50, Thomas Morley (<thomasmorle...@gmail.com>) escribió: > Am Mi., 1. Mai 2019 um 19:40 Uhr schrieb David Kastrup <d...@gnu.org>: > > > > Stefano Troncaro <stefanotronc...@gmail.com> writes: > > > > > Hi everyone! According to this page in the manual > > > < > http://lilypond.org/doc/v2.19/Documentation/usage/writing-code-to-support-multiple-versions > > > > > the function ly:version? should be implemented, but the example given > fails > > > with the error 'unbound variable: ly:version?' which suggests it's > not. I'm > > > running it in 2.19.83, was this function deleted and the documentation > not > > > updated? > > > > > > Copying the example here: > > > > > > #(cond > > > ((ly:version? > '(2 20)) > > > (ly:message "This is code to run for LilyPond after 2.20")) > > > ((ly:version? = '(2 19 57)) > > > (ly:message "This will only be executed with LilyPond 2.19.57")) > > > (else (ly:message "This will be executed in any other version"))) > > > > > > > > > Does anyone know what is happening? > > > > They were never exported: they are defined using define, not > > define-public. Now _that_ would have been a feature worth a regtest! > > > > -- > > David Kastrup > > Entered as > https://sourceforge.net/p/testlilyissues/issues/5517/ > > For now the relevant code could be copied or brute-force > #(define ly:version? (@@ (lily) ly:version?)) > > Cheers, > Harm >
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