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From: Richard Stallman <rms@gnu.org>
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Subject: Re: read-file-name error-handling problem
Date: Mon, 12 Aug 2002 11:47:55 -0600 (MDT)
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I figured out the cause of this.  The minibuffer's recursive edit
comes inside your condition-case, and it established an environment
where the debugger is allowed to run.

It may not be the result that you want, but I am not sure it is a bug.