Thank you for your explanation and your links, now it works! Le jeu. 1 févr. 2024, 12:05, Jean Abou Samra <j...@abou-samra.fr> a écrit :
> Try > > #(define (should-not-print-arranger layout props) > (equal? "" (chain-assoc-get 'header:arranger props))) > > For one thing, 'header:arranger just gives a symbol > <https://extending-lilypond.gitlab.io/en/scheme/quoting.html>, it doesn't > look up the arranger. A symbol is never equal to a string. For another, > eq? is the wrong test; it checks object identity > <https://extending-lilypond.gitlab.io/en/scheme/quoting.html#identity-of-symbols> > but you could have two empty strings which are equal but not the same > object (unlike symbols). The links should provide more information. > > Best, > > Jean >
