bug#24057: 25.1.50; ffap interprets comments beginning with "//" as file path

[Eli Zaretskii]

> From: Kaushal Modi <kaushal.modi@gmail.com>
> Date: Sat, 23 Jul 2016 13:23:08 +0000
> Cc: 24057@debbugs.gnu.org, npostavs@users.sourceforge.net
> 
>  Did you try this on some system where "//tmp" is a valid file name,
>  which is different from "/tmp"?
> 
> I have never dealt with such files.
> 
> My brief attempt just to try creating such a file failed:
> 
> km²~/temp/:> touch '//abc' 
> touch: cannot touch `//abc': Permission denied
> km²~/temp/:> touch '\/\/abc' 
> touch: cannot touch `\\/\\/abc': No such file or directory
> 
> Can you show how to recreate the issue that you are thinking?

You need to be on a system that supports that.  Windows is one of
them; not sure if there are any others left nowadays.

> Or can you try recreating the problem on your system with this patch?

I didn't try.

> Or, should this patch anyways go in the master, and we let the emacs-devel 
> give us feedback if this results in
> anything unexpected?

It should definitely go to master only.