bug#47488: Treatment of # in js.el

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Lars Ingebrigtsen <larsi@gnus.org>,  47488@debbugs.gnu.org,
>   dgutov@yandex.ru,  rrt@sc3d.org
> Date: Wed, 12 May 2021 16:39:13 +0200
> 
> On Mai 12 2021, Eli Zaretskii wrote:
> 
> > The #file directive is emitted by the preprocessor, so that later
> > compiling the preprocessed source would yield the correct source line
> > numbers.  Try preprocessing some .c file with "gcc -E" and you will
> > see these directives in the output.
> 
> Not by gcc.  It uses # LINE FILE FLAGS for that purpose.  The gcc
> preprocessor doesn't know anything about #file.

You are right, sorry.  I confused this with #line, which can
optionally state the file.