bug#63579: org-babal-lilypond fontification error

[Eli Zaretskii]

> Cc: 63579@debbugs.gnu.org
> From: Ihor Radchenko <yantar92@posteo.net>
> Date: Fri, 19 May 2023 09:09:02 +0000
> 
> This is a problem with lilypond:
> 
> Debugger entered--Lisp error: (void-variable font-lock-reference-face)
>   (eval font-lock-reference-face t)
>   (#f(compiled-function (highlight) "Apply HIGHLIGHT following a 
> match.\nHIGHLIGHT should be of the form MATCH-HIGHLIGHT, see 
> `font-lock-keywords'." #<bytecode -0xf53eae0ec5f928c>) (0 
> font-lock-reference-face t))
>   (font-lock-fontify-keywords-region 1 42 nil)
>   (font-lock-default-fontify-region 1 42 nil)
>   (font-lock-fontify-region 1 42)
>   (#f(compiled-function (beg end) #<bytecode -0x19f31ec42bd98447>) 1 42)
>   (font-lock-ensure)
> 
> `font-lock-reference-face' is an obsolete variable that has been removed
> in Emacs 29.
> 
> Please report this issue to Lilypond developers. See
> https://lilypond.org/bug-reports.html

Thanks for investigating; I'm therefore closing this bug.