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From: Mathias Dahl <brakjoller@gmail.com>
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Subject: Re: how NOT to remove trailing whitespace?
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Eric Hanchrow <offby1@blarg.net> writes:

> Rather than asking us to debug your .emacs for you, I suggest you do
> what I do when faced with similar mysteries: binary-search your
> .emacs to find the culprit.  That is, start with an empty .emacs;
> see if the problem repros.  If it does, your .emacs is off the hook.
> If not, then try the first half of the forms in it, and so on.

I usually put an (error "stopping here") statement to do such a binary
search debug. That way I don't have to change my .emacs file much.