bug#13581: 24.3.50; regression: defadvice does not work, to augment doc string

[Drew Adams]

emacs -Q
 
(defun frog () (interactive) (message "croak"))
(define-key isearch-mode-map "\C-o" 'frog)
(defadvice isearch-forward (before froggy activate)
  "\\<isearch-mode-map>\\[frog] - hear Froggy croak")
 
C-h f isearch-forward
 
No Froggy to be seen.  Worked in previous Emacs versions, including 24.2.

 
In GNU Emacs 24.3.50.1 (i386-mingw-nt5.1.2600)
 of 2013-01-25 on ODIEONE
Bzr revision: 111604 eliz@gnu.org-20130125143821-1ykj7ia1qjojjjnp
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.7) --no-opt --enable-checking --cflags
 -IC:/Devel/emacs/build/include --ldflags -LC:/Devel/emacs/build/lib'