GNU bug report logs - #23534
Failing to recognize -- as comment-starter

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: bug-gnu-emacs <at> gnu.org
Subject: Failing to recognize -- as comment-starter
Date: Fri, 13 May 2016 16:28:06 -0400

Package: Emacs
Version: 25.1.50


There's a regression on master where a -- comment-starter fails to be
recognized.  This affects haskell-mode.

Put the following in bug-mode.el:

    (defvar bug-mode-syntax-table
      (let ((st (make-syntax-table)))
        (modify-syntax-entry ?- "_ 123" st)
        (modify-syntax-entry ?\n ">" st)
        st))
    
    (define-derived-mode bug-mode prog-mode "BUG"
      "Major mode to exhibit the bug."
      (setq-local font-lock-defaults '(nil))
      (insert "-- hello\n"))

And then

    emacs -Q -l bug-mode.el -f bug-mode

In Emacs-24.5 (and emacs-25) you then see "-- hello" highlighted as
a comment, but on "master" this stays in default face.


        Stefan




In GNU Emacs 25.1.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-04-17 built on alfajor
Repository revision: 330dcb8fa9dc04fa6b95550774c654435f470277
Windowing system distributor 'The X.Org Foundation', version 11.0.11802000
System Description:	Debian GNU/Linux testing (stretch)

Configured using:
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 PKG_CONFIG_PATH=/home/monnier/lib/pkgconfig'

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/home/monnier/src/emacs/elpa/packages/seq/seq hides /home/monnier/src/emacs/work/lisp/emacs-lisp/seq
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Message #16 received at 23534-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 23534-done <at> debbugs.gnu.org
Subject: Re: Failing to recognize -- as comment-starter
Date: Sat, 02 Sep 2017 15:53:12 +0300

> From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> Date: Fri, 13 May 2016 16:28:06 -0400
> 
> Put the following in bug-mode.el:
> 
>     (defvar bug-mode-syntax-table
>       (let ((st (make-syntax-table)))
>         (modify-syntax-entry ?- "_ 123" st)
>         (modify-syntax-entry ?\n ">" st)
>         st))
>     
>     (define-derived-mode bug-mode prog-mode "BUG"
>       "Major mode to exhibit the bug."
>       (setq-local font-lock-defaults '(nil))
>       (insert "-- hello\n"))
> 
> And then
> 
>     emacs -Q -l bug-mode.el -f bug-mode
> 
> In Emacs-24.5 (and emacs-25) you then see "-- hello" highlighted as
> a comment, but on "master" this stays in default face.

It is highlighted as a comment with the current master, so I guess the
bug was solved in the meantime.

Thanks.

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