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bug#8206: 24.0.50; flet breaks advised functions


From: Andreas Politz
Subject: bug#8206: 24.0.50; flet breaks advised functions
Date: Tue, 08 Mar 2011 21:28:50 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

I just discovered that `flet' does not work with (at least some form of)
advised functions, such that it doesn't restore the original function.
The underlying problem is demonstrated by the following code and seems
to date back to at least Version 22.3.1 .

(progn
  (defun foo () 'defun)
  (defadvice foo (around foo activate)
    ad-do-it)
  (setq letf-save (symbol-function
                   ;;'ad-Orig-foo
                   'foo
                   ))
  (fset 'foo (lambda nil 'flet))
  (fset 'foo letf-save)
  (foo))

=> flet

-ap


In GNU Emacs 24.0.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.20.1)
 of 2010-06-13 on raven
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
Important settings:
  value of $LC_ALL: C
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Article

Minor modes in effect:
  shell-dirtrack-mode: t
  yas/global-mode: t
  ido-hacks-mode: t
  easy-repeat-mode: t
  recentf-mode: t
  window-numbering-mode: t
  server-mode: t
  show-paren-mode: t
  global-hi-lock-mode: t
  display-time-mode: t
  savehist-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
o l u m n <return> C-. c E C-. b C-x o C-s e v a l 
C-s C-s C-s C-g C-s p r i n <return> <return> M-1 C-x 
b <return> C-x b <return> C-. b C-x b <return> M-p 
C-M-\ C-M-b M-f M-f C-M-f C-e C-n C-M-u C-M-u C-j C-M-f 
C-f C-j C-e C-p C-p C-p M-f M-f M-b M-d M-d M-d f i 
l l - c o l u m n <return> C-x C-b g C-r m i n i C-g 
C-x b <return> M-p C-r b u C-r C-r C-r M-f - C-n <return> 
M-p <return> C-x b <return> E C-n C-n C-n C-n C-n C-n 
C-p C-p C-p C-p C-p C-p M-p M-p <return> C-x b <return> 
M-p <return> M-p <return> M-: M-: C-g M-p <return> 
M-x M-x M-x C-g C-g C-g M-p <return> M-x M-x M-x M-x 
C-g M-p <return> C-x b m c <return> C-n M-f M-f M-f 
M-f M-f M-f M-f M-b M-x f f <tab> a p <tab> <tab> - 
l i <tab> t <tab> <tab> C-g C-M-x M-x f f <tab> a p 
- l <tab> i <tab> C-h <tab> t <tab> <tab> C-g M-2 C-x 
b m i n i M-h c o m p l e <return> C-, b q M-1 C-x 
C-f ~ / . b a s h r <return> C-e C-j e c h o SPC ' 
1 1 . 3 . SPC M a m a ' C-x C-s C-, s g C-n <return> 
<return> M-2 C-v C-l M-v M-1 q <return> <return> M-2 
C-n C-n C-n C-SPC M-} M-} M-} M-} M-w M-x e m a c s 
M-h r e p o r t <tab> b u g <return> C-g C-. f f s 
e t <return> M-x M-p <return>

Recent messages:
Reordering buffer... Done
Fetching headers for nntp+news.fh-trier:gnu.emacs.help...done
Generating summary...done
Fetching articles for nntp+news.fh-trier:gnu.emacs.help...
Auto-saving...done
Mark set
Quit
Starting new Ispell process [en] ...
Checking spelling of ADVISE...
ADVISE is correct

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Features:
(shadow quail fix-umlaut emacsbug skeleton sh-script executable
tramp-imap tramp-gw tramp-fish tramp-smb tramp-cache tramp-ftp
tramp-cmds tramp shell tramp-compat trampver w3m-cookie w3m-bookmark
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flow-fill w3m-form mule-util w3m doc-view jka-compr image-mode w3m-hist
w3m-fb bookmark-w3m w3m-ems w3m-ccl ccl w3m-favicon w3m-image w3m-proc
w3m-util qp gnus-cite ansi-color gnus-async gnus-bcklg sort gnus-ml
gnus-demon parse-time nnfolder warnings byte-opt bytecomp byte-compile
nnmbox utf-7 utf7 auth-source netrc starttls nnimap imap nndraft nnmh
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epg-config mm-view smime password-cache dig mailcap nntp gnus-cache
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tex-site auto-loads bbdb-autoloads bbdb gnus-start gnus-spec gnus-int
gnus-range message rfc822 mml mml-sec mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils
mailheader gnus-win gnus gnus-ems nnheader gnus-util mail-utils mm-util
mail-prsvr yasnippet dropdown-list assoc generic org-install ispell
info-look imenu ido-hacks ibuf-macs ibuf-ext ibuffer dired-x dired-aux
dired dired-details info color-theme sendmail reporter minibuffer-regexp
kbd-helper edit-server ffap avoid easy-repeat repeat time-date recentf
tree-widget wid-edit easymenu hippie-exp my-anything anything foldout
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kmacro uniquify winner paren ido grep compile comint regexp-opt ring
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help-fns savehist cl cl-19 tooltip ediff-hook vc-hooks lisp-float-type
mwheel x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register
page menu-bar rfn-eshadow timer select scroll-bar mldrag mouse jit-lock
font-lock syntax facemenu font-core frame cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew
greek romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind dynamic-setting
font-render-setting gtk x-toolkit x multi-tty emacs)





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