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

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

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

>