bug#29991: Document how user can find all obsolete items he has set

[Eli Zaretskii]

> From: 積丹尼 Dan Jacobson <jidanni@jidanni.org>
> Cc: 29991@debbugs.gnu.org
> Date: Fri, 05 Jan 2018 22:47:17 +0800
> 
> >>>>> "EZ" == Eli Zaretskii <eliz@gnu.org> writes:
> 
> EZ> Bisect your .emacs to find where that happens, then take it from
> EZ> there.
> 
> All I know is my .emacs runs fine with no errors.
> 
> It's just when I use
> dired-do-byte-compile on it do I get a weird "t" error.
> So it must be dired-do-byte-compile that has the problem.

Maybe, but we will never know unless you show which part causes that.

In any case, you asked for a way to check out your .emacs, and now you
have it.  Whether that problem with 't' is part of the issue or just
something to work around to get the byte compilation run to
completion, is a separate issue.