Subject: RE: [External] : Re: bug#76055: 29.4; Doc of string-empty-p

From: Drew Adams <[email-masked]>
Date: Sun, 9 Feb 2025 03:57:36 +0000

> > > However, while extending to strings comparison to symbol names could
> > > make sense, telling whether a string is empty (the subject of this
> > > report) is NOT: what symbol could have an empty name?
> >
> > That's easy.
> >
> > (intern "") gives you such a symbol.
> > It's written ## (dunno why).
> >
> > (symbol-name '##) ; => ""
> 
> And where did you see such symbols used in Emacs?

Serendipitously, just came across this use of it today:

https://github.com/tarsius/llama

Linked from this Reddit thread:

https://www.reddit.com/r/emacs/comments/1il4itl/what_does_the_double_pound_mean_in_emacs_lisp/?ref=share&ref_source=link