GNU bug report logs - #49944
parse-partial-sexp fails to signal an error when (> START LIMIT).

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Package: emacs;

Reported by: Alan Mackenzie <acm <at> muc.de>

Date: Sun, 8 Aug 2021 18:02:01 UTC

Severity: normal

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Alan Mackenzie <acm <at> muc.de>
Cc: 49944 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: bug#49944: parse-partial-sexp fails to signal an error when (> START LIMIT).
Date: Sun, 08 Aug 2021 20:14:25 +0200

Alan Mackenzie <acm <at> muc.de> writes:

> On calling
>
>     (parse-partial-sexp 19 18 nil nil s)

(What's `s' here?)

> Emacs surely ought to signal an error, since 18 < 19.

It's common for Emacs functions that take a region to not care about
whether to is larger than from or not.  The

  validate_region (&from, &to);

function fixes it up.

> It doesn't,
> though.  It leaves point at a random position and returns
>
>     (0 nil nil nil nil nil 0 nil nil nil nil)

For me it leaves point at 19.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
This bug report was last modified 3 years and 272 days ago.

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