bug#10494: 24.0.92; Syntax table and non-ASCII character interaction

[Eli Zaretskii]

> Date: Sat, 13 Aug 2016 17:31:48 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 10494@debbugs.gnu.org, aaronecay@gmail.com
> 
> > From: npostavs@users.sourceforge.net
> > Cc: 10494@debbugs.gnu.org,  aaronecay@gmail.com
> > Date: Sat, 13 Aug 2016 10:19:34 -0400
> > 
> > >>     (modify-syntax-entry ?’ "w" text-mode-syntax-table)
> > >>     (defconst my-text-char-script-table
> > >>       (let ((table (copy-sequence char-script-table)))
> > >>         (aset table ?’ 'latin)
> > >>         table))
> > >> 
> > >>     (defun my-text-mode-hook ()
> > >>       (set (make-local-variable 'char-script-table)
> > >>            my-text-char-script-table))
> > >>     (add-hook 'text-mode-hook 'my-text-mode-hook)
> > >
> > > Are you sure nothing in text-mode will ever want to use \s_ in any
> > > regexp?
> > 
> > Did you mean \> (word boundary) or \s. (punctation)?  \s_ doesn't match
> > ’ regardless because its syntax class is punctuation, not symbol.
> 
> Sorry, I guess I was thinking of \cl.  It will not match ’, although
> it might be expected.
> 
> Anyway, my point is that these char-tables should really be treated as
> read-only by Lisp applications.

Btw, some believe that using ’ as an apostrophe is wrong.  They say
U+02BC should be used instead; see, for example, this discussion:

  http://www.unicode.org/mail-arch/unicode-ml/y2015-m06/0047.html

That character already is word-constituent.