Re: :alnum: broken?

[Eli Zaretskii]

> From: Paul Eggert <address@hidden>
> Date: Sun, 23 Feb 2020 10:13:16 -0800
> Cc: Stephen Leake <address@hidden>,
>  emacs-devel <address@hidden>
> 
> The byte-compiler could warn about some of these blunders and if someone 
> wants 
> to change the byte-compiler to do that, it would be an improvement. However, 
> this would necessarily either cry wolf or let blunders through, because the 
> byte-compiler cannot reliably determine whether a string will be used as a 
> regular expression.

Indeed, the byte compiler cannot, which is why issuing a warning is
appropriate.  Experience shows that we do pay attention to warnings
and try to have our sources compile warning-free.