bug#32649: 27.0.50; up-list stops inside comment

[Andreas Röhler]

On 07.09.2018 10:53, Andreas Schwab wrote:
> On Sep 07 2018, Andreas Röhler <andreas.roehler@easy-emacs.de> wrote:
>
> > On 07.09.2018 06:46, Leo Liu wrote:
> > > On 2018-09-06 21:04 +0200, Andreas Röhler wrote:
> > > > In scratch-buffer, cursor at "d" towards end of line 1
> > > >
> > > > (foo\n(a ;(b c d)
> > > > e) bar)
> > > >
> > > > M-- M-x up-list --called with negative argument-- stops at opening
> > > > paren inside comment.
> > >
> > > I am not following. What is the issue here?
> >
> > A list can't start resp. end inside a commented section.
>
> Sure it can.  Just because it's behind a comment char doesn't mean it's
> not a list.
>
> Andreas.

From Elisp Info

2.2 Comments
============

A "comment" is text that is written in a program only for the sake of
humans that read the program, and that has no effect on the meaning of
the program.  [...] The Lisp reader discards comments; they do not
become part of the Lisp objects which represent the program within the
Lisp system.

;;;

BTW being in favor to remove all syntax-fiddling from plain text modes 
and fundamental-mode alike. Setting syntax there must produce 
inconsistency and unexpected behavior.


An example: try M-x backward-sexp RET from end of a text-mode buffer 
with contents:

1) Asdf
2) Asdf

>