Subject: bug#53749: 29.0.50; [PATCH] Xref backend for TeX buffers

From: Stefan Monnier <[email-masked]>
Date: Sat, 04 May 2024 10:54:46 -0400

> FWIW, I'm not sure if there is an URL for that, but in interface3.pdf,
> chap.1, you'll find:
[...]
> So expect things like this:
>
>     \tl_set:Nn \l_mya_tl { A }
>     \tl_set:Nn \l_myb_tl { B }
>     \tl_set:Nf \l_mya_tl { \l_mya_tl \l_myb_tl }

But that is *also* valid LaTeX, with a different meaning (i.e. where
`_` has its subscript meaning).  So we need some other info in order to
know which of the two we're dealing with.

Maybe that info is simply "assume LaTeX3 if the _ is followed by several
letters" or some such heuristic, but the comment should say so.

        Stefan