Re: safe_call1 considered harmful

[Eli Zaretskii <eliz@gnu.org>]

> From: Kenichi Handa <handa@m17n.org>
> CC: emacs-devel@gnu.org
> Date: Fri, 21 Jul 2006 20:34:16 +0900
> 
> But, by considering this problem again, I found another
> solution than calling find-operation-coding-system with
> (FILENAME . BUFFER).  That is to provide an extra argument
> BUFFER.  Then, we can keep backward compatibility and
> find-buffer-file-type-coding-system works as before, and, by
> modifying po-find-file-coding-system to check that extra
> argument instead of checking if FILENAME is cons or not, we
> can make it work well too.

This will work if no function on file-coding-system-alist currently
looks at arguments beyond the 1st one, the file name.  If there are
functions which look beyond that, such a change will break them.
While the chance of having such functions is very small, I don't see
how any significant change in the API could avoid breaking some
function that wasn't written to support the new API.

In any case, I think we should revert the change you made to use
safe_call1.  Then we will quickly find any remaining functions that
need to be modified.