On 04/11/20 15:30, Stefan Monnier wrote > Yes, please! > > I even added a font-lock rule to highlight such cases in red, but > apparently that rule doesn't catch this particular case (if you replace > the empty string with a symbol, it does catch it, tho). > Hi Stefan, thank you for the prompt reply. I attached a patch for this little change. Let me know if I did something wrong or you want me to change something. Thank you -- Manuel Uberti www.manueluberti.eu