bug#27920: 25.2; Elisp indentation breaks when function docstring matches "^("

bug#27920: 25.2; Elisp indentation breaks when function docstring matches "^("

[Ryan]

When editing Emacs Lisp code, if I write a function whose docstring
contains a line beginning with an open paren, Emacs refuses to
auto-indent any line in the function body. Removing the offenting
parenthesis or adding a non-paren character before it on the same line
allow Emacs to indent the body once again. Here's an example function
that triggers the bug:

(defun my-fun (x)
"This docstring contains a line starting with \"(\"

(This line starts with an open paren)

The offending line can occur anywhere in the docstring, except
the first line."
;; Emacs now refuses to indent the function body
t
'really-bad-indentation
'indent-region-has-no-effect
'indent-for-tab-command-has-no-effect
(list
'even-inside-function-calls))

In case that is mangled, here's a pastebin with the same function:
https://mneme.dedyn.io/zerobin/?69cf2138062fc4f6#7FIzc4PEGDq2+V390LXW4HhvC3WVMNoc9ATBmoj/3qE=



In GNU Emacs 25.2.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 
Version 10.9.5 (Build 13F1911))
of 2017-04-21 built on builder10-9.porkrind.org
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
'configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

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

Major mode: Lisp Interaction

Minor modes in effect:
recentf-mode: t
ws-butler-global-mode: t
ws-butler-mode: t
winner-mode: t
sml-modeline-mode: t
savehist-mode: t
save-place-mode: t
minibuffer-electric-default-mode: t
minibuffer-depth-indicate-mode: t
midnight-mode: t
ido-yes-or-no-mode: t
icomplete-mode: t
highlight-stages-global-mode: t
highlight-stages-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
global-pointback-mode: t
pointback-mode: t
global-hl-line-mode: t
global-anzu-mode: t
anzu-mode: t
desktop-save-mode: t
delete-selection-mode: t
beacon-mode: t
auto-dim-other-buffers-mode: t
ido-ubiquitous-mode: t
ido-complete-space-or-hyphen-mode: t
ido-everywhere: t
pretty-symbols-mode: t
osx-pseudo-daemon-mode: t
diff-auto-refine-mode: t
magit-auto-revert-mode: t
global-git-commit-mode: t
async-bytecomp-package-mode: t
lexbind-mode: t
highlight-defined-mode: t
autopair-global-mode: t
autopair-mode: t
show-paren-mode: t
global-auto-complete-mode: t
auto-complete-mode: t
adjust-parens-mode: t
override-global-mode: t
shell-dirtrack-mode: t
tooltip-mode: t
global-eldoc-mode: t
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
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 messages:
Mark set [7 times]
Type "q" to restore previous buffer.
Type "q" in help window to restore its previous buffer.
Mark set
Scanning for dabbrevs...done
Expansion found in ‘*Help*’
Mark set
Indenting region...done
Mark set [3 times]
Indenting region...done

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Features:
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bug#27920: 25.2; Elisp indentation breaks when function docstring matches "^("

[Philipp Stephani]

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Ryan <rct@thompsonclan.org> schrieb am Mi., 2. Aug. 2017 um 18:57 Uhr:

>
> When editing Emacs Lisp code, if I write a function whose docstring
> contains a line beginning with an open paren, Emacs refuses to
> auto-indent any line in the function body.


Emacs by default doesn't accept opening parentheses in the first column
that don't start a top-level definition. See
https://www.gnu.org/software/emacs/manual/html_node/emacs/Left-Margin-Paren.html
.

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bug#27920: 25.2; Elisp indentation breaks when function docstring matches "^("

[Ryan Thompson]

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Ok, that's good to know. That page claims that Emacs "highlights confusing
opening delimiters (those that ought to be quoted) in bold red", but I'm
not seeing that in this case. Is there some setting to enable this, or is
it likely that some other elisp package I have installed is interfering
with this highlighting? Or can Emacs not catch this kind of misplaced paren
in a string?

On Wed, Aug 2, 2017 at 2:34 PM Philipp Stephani <p.stephani2@gmail.com>
wrote:

>
>
> Ryan <rct@thompsonclan.org> schrieb am Mi., 2. Aug. 2017 um 18:57 Uhr:
>
>>
>> When editing Emacs Lisp code, if I write a function whose docstring
>> contains a line beginning with an open paren, Emacs refuses to
>> auto-indent any line in the function body.
>
>
> Emacs by default doesn't accept opening parentheses in the first column
> that don't start a top-level definition. See
> https://www.gnu.org/software/emacs/manual/html_node/emacs/Left-Margin-Paren.html
> .
>

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bug#27920: 25.2; Elisp indentation breaks when function docstring matches "^("

[Glenn Morris]

Ryan Thompson wrote:

> That page claims that Emacs "highlights confusing opening delimiters
> (those that ought to be quoted) in bold red", but I'm not seeing that
> in this case.

This feature has been broken since Emacs 24.4. https://debbugs.gnu.org/21871

bug#27920: 25.2; Elisp indentation breaks when function docstring matches "^("

[Stefan Monnier]

> In case that is mangled, here's a pastebin with the same function:

You can do (setq open-paren-in-column-0-is-defun-start nil)


        Stefan

bug#27920: 25.2; Elisp indentation breaks when function docstring matches "^("

[Noam Postavsky]

unmerge 27920
tags 27920 = fixed
close 27920 26.1
quit

Ryan <rct@thompsonclan.org> writes:

> When editing Emacs Lisp code, if I write a function whose docstring
> contains a line beginning with an open paren, Emacs refuses to
> auto-indent any line in the function body. Removing the offenting
> parenthesis or adding a non-paren character before it on the same line
> allow Emacs to indent the body once again. Here's an example function
> that triggers the bug:

This bug was marked as wontfix, but I accidentally fixed it while fixing
Bug#25122, sorry.  ;)