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bug#9570: 24.0.50; "debug-on-entry: Definition of ... is not a list"

From: Drew Adams
Subject: bug#9570: 24.0.50; "debug-on-entry: Definition of ... is not a list"
Date: Wed, 21 Sep 2011 20:48:20 -0700

emacs -Q
Load file fuzzy.el, available in the tar or zip here:
(The file is small.)
M-x debug-on-entry isearch-message-prefix RET
raises this error:
debug-on-entry: Definition of isearch-message-prefix is not a list
The file is contains this advice:
(defadvice isearch-message-prefix (after fuzzy-isearch-message-prefix activate)
  (if fuzzy-isearch
      (setq ad-return-value (concat fuzzy-isearch-prefix ad-return-value))
I seem to vaguely recall some problem associated with lexbind, advice,
and the debugger (and perhaps byte-compiling?).  But a search of the
Elisp manual and some bug reports turned up nothing.  I thought that
such problems had already been ironed out, but perhaps not.
It's very hard to find the cause of such an error - even just locating
the code that leads to it is not easy.  And it's not clear to me now
what a user can/should do about it.  What's the deal?  If there is
something that users must not do or must avoid, then please document it.
In GNU Emacs (i386-mingw-nt5.1.2600)
 of 2011-09-19 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.5) --no-opt'

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