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bug#12141: 24.1.50; Mismatched parentheses in Python mode. Regression be

From: Matt McClure
Subject: bug#12141: 24.1.50; Mismatched parentheses in Python mode. Regression between 2012-07-14 and 2012-07-28.
Date: Sun, 5 Aug 2012 10:09:23 -0400

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

Between 2012-07-14 and 2012-07-28, Emacs regressed and started reporting
"Mismatched parentheses" in Python buffers where the parentheses are

To reproduce on Mac OS X:

    open -a Emacs --args -Q --no-site-file

    C-x C-f foo.py

    def foo()

Observe on typing `)` that the echo area reports "Mismatched parentheses".

Expected: the cursor flashes briefly on the matching opening `(`.

The defect is present in:

GNU Emacs (x86_64-apple-darwin, NS apple-appkit-1038.36) of
2012-07-28 on bob.porkrind.org

And is not reproducible in:

GNU Emacs (x86_64-apple-darwin, NS apple-appkit-1038.36) of
2012-07-14 on bob.porkrind.org

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file

In GNU Emacs (x86_64-apple-darwin, NS apple-appkit-1038.36)
 of 2012-07-28 on bob.porkrind.org
Bzr revision: 109240 address@hidden
Windowing system distributor `Apple', version 10.3.1138
Configured using:
 `configure '--host=x86_64-apple-darwin' '--build=i686-apple-darwin'
 '--with-ns' 'build_alias=i686-apple-darwin'
 'host_alias=x86_64-apple-darwin' 'CC=gcc -mmacosx-version-min=10.5''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Python

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x C-f ~ / D o w n l o a d s / f o o . p y <return>
d e f SPC f o o ( ) <escape> x r e m p o <tab> <backspace>
<backspace> <backspace> p o <tab> r <tab> <return>
M i s m a t c h e d SPC p a r a <backspace> e n C-x
o C-x b C-g C-g C-g C-x o C-x b * M e <tab> <return>
C-p C-p C-p C-p C-p C-p C-p C-n C-n C-a C-s m i s m
a C-a C-x b <return> <backspace> ) <escape> x r e p
o r t SPC e m <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Can't guess python-indent-offset, using defaults: 4
Making completion list...
byte-code: Command attempted to use minibuffer while in minibuffer
Quit [3 times]
byte-code: Beginning of buffer [2 times]
Mark saved where search started

Load-path shadows:
None found.

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Matt McClure

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