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[debbugs-tracker] bug#24753: closed (26.0.50; Error using Edebug on code

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#24753: closed (26.0.50; Error using Edebug on code that uses cl-defmethod)
Date: Sun, 07 May 2017 02:12:02 +0000

Your message dated Sun, 7 May 2017 05:11:35 +0300
with message-id <address@hidden>
and subject line Re: bug#24753: 26.0.50; Error using Edebug on code that uses 
has caused the debbugs.gnu.org bug report #24753,
regarding 26.0.50; Error using Edebug on code that uses cl-defmethod
to be marked as done.

(If you believe you have received this mail in error, please contact

24753: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24753
GNU Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: 26.0.50; Error using Edebug on code that uses cl-defmethod Date: Fri, 21 Oct 2016 08:15:02 -0700
Edebug gets confused after instrumenting multiple methods with the same
name created by cl-defgeneric and cl-defmethod. To reproduce, save the
following bit of code (which is an excerpt from cl-generic-tests.el)
to bug.el:

(require 'cl-generic)

(fmakunbound 'foo)
(cl-defgeneric foo (x y))
(cl-defgeneric (setf foo) (v y z) "My generic doc.")
(cl-defmethod (setf foo) (v (y t) z) (list v y z))
(cl-defmethod (setf foo) (v (_y (eql 4)) z) (list v "four!" z))

(defun foo-bug ()
  (message "%s" (setf (foo 'a 'b) 'v)))


Steps to reproduce:
1. emacs -Q
2. C-x C-f bug.el RET
3. M-x edebug-all-defs RET
4. M-x eval-buffer RET
5. g

Result: edebug--display: Args out of range: [44 51 61 62], 4

The trouble seems to be that Edebug is attaching its per-definition data
for both methods to the same symbol, address@hidden I found that
changing the relevant line in cl-defmethod's Edebug spec from this:

             [&or name ("setf" :name setf name)]

to this:

             [&or symbolp ("setf" symbolp)]

makes the problem go away by creating new anonymous symbols for the
methods. Although if you want to try this out interactively, you'll need
to set edebug-form-data to nil for the buffer, because otherwise Edebug
will remember the previous name you gave the definition and reuse it.

While I was looking at the Edebug spec for cl-defmethod, I also noticed
that it uses list to match the argument list. Edebug is going to treat
list as a predicate, and list is going to return a non-nil value for
whatever is in that match position. I don't know of any real problem
that could cause, but using listp would be more correct.

In GNU Emacs (x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version 
10.11.6 (Build 15G1004))
 of 2016-10-20 built on rainbow.local
Repository revision: 9e1e257ea8605354d15b4bd93e0af6188aae40db
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
Mark set
Replaced 8 occurrences
Edebug: address@hidden [2 times]
Edebug: foo-bug
edebug--display: Args out of range: [44 51 61 62], 4
Configured using:
 'configure --with-ns --disable-ns-self-contained'

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  global-undo-tree-mode: t
  undo-tree-mode: t
  diff-auto-refine-mode: t
  ivy-mode: t
  buffer-face-mode: t
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  yas-minor-mode: t
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  shell-dirtrack-mode: t
  nameless-mode: t
  beacon-mode: t
  rainbow-mode: t
  column-enforce-mode: t
  volatile-highlights-mode: t
  region-state-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  smartparens-global-mode: t
  smartparens-global-strict-mode: t
  smartparens-strict-mode: t
  smartparens-mode: t
  which-key-mode: t
  modalka-mode: t
  recentf-mode: t
  global-auto-revert-mode: t
  winner-mode: t
  display-time-mode: t
  savehist-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-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
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

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Memory information:
((conses 16 1177625 172614)
 (symbols 48 51408 177)
 (miscs 40 3885 2827)
 (strings 32 171089 94705)
 (string-bytes 1 4748760)
 (vectors 16 79548)
 (vector-slots 8 1384454 66001)
 (floats 8 5239 1496)
 (intervals 56 62071 8434)
 (buffers 976 47))

--- End Message ---
--- Begin Message --- Subject: Re: bug#24753: 26.0.50; Error using Edebug on code that uses cl-defmethod Date: Sun, 7 May 2017 05:11:35 +0300 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:53.0) Gecko/20100101 Thunderbird/53.0
Version: 26.1

On 02.05.2017 10:24, Eli Zaretskii wrote:

I'm therefore closing this bug, and also the related bug#23995.

This one is still open, only the related one was closed. So, closing.

--- End Message ---

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