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From: Richard Stallman <rms@gnu.org>
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Subject: Re: debug-on-error doesn't catch 'cannot write backup file'
Date: Tue, 24 Dec 2002 21:47:08 -0500
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    I did  (set-variable (quote debug-on-error) t)
    but that was not enough to start the dubugger when one hit
    "Cannot write backup file; backing up in %backup%~"

That is not an error.  If it were an error, it would make the command
fail, and that is not desirable.